• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Method and device for spatially resolved pressure measurement along a pressure range, wherein according to the invention it is proposed that a fiberglass jacket (11 "), comprising a glass fiber core (11") extending inside a tubular sheath (6) in the longitudinal direction of the sheath (6) '), as well as an outer protective layer (16), on a length portion of the along the pressure region (15) arranged tubular sheath (6) isotropically acting pressure is converted into an asymmetric pressure load on the lying within the length portion of the glass fiber sheath (11') measuring the birefringence caused by the asymmetric pressure load in this longitudinal section and determining it from the thus determined asymmetrical pressure loading of the pressure acting on the longitudinal section by means of a reflection measurement along the glass fiber 11. With the aid of the invention it is possible to move along the glass fiber (11) ei ne perform spatially resolved pressure measurement, and thus in a cost-effective manner to determine the pressure profile along the in the pressure range (15) arranged, tubular sheath (6).
    公开号:AT513732A1
    申请号:T1246/2012
    申请日:2012-11-27
    公开日:2014-06-15
    发明作者:
    申请人:Fct Fiber Cable Technology Gmbh；
    IPC主号:
    专利说明:

    1
    The invention relates to a method for spatially resolved pressure measurement along a pressure range according to the preamble of claim 1, and to a device for spatially resolved pressure measurement along a pressure range according to the preamble of claims 2 and 8.
    In many applications it is necessary to carry out pressure measurements under extreme conditions with regard to accessibility of the measuring range or the ambient temperature, for example in the gas and oil production industry, in suspension cables such as e.g. in crane applications, in deep-sea applications such as tsunami, or in high-pressure water pipelines for power plants etc. In oil exploration, for example, it is necessary to know the pressure conditions in the borehole in order to be able to control and optimize the transport of the oil to the surface. Known methods for this purpose provide above all electrical measuring devices that are installed within the pressure range at different depths and should provide information about pressure and temperature. The use of such electrical measuring devices is in adverse environmental conditions such as high temperature, high vibration, and high hydrostatic pressure but very limited and very problematic in practice. In addition, a correct function must be guaranteed, since faulty pressure and temperature measurements can have fatal and costly consequences, such as when operating a borehole. Furthermore, the transmission of electrical signals is sometimes difficult when radio links are not applicable and electrical cables must be laid appropriately protected, as adverse temperature and pressure conditions and the influence of corrosive fluids within the pressure range would damage the cable insulation quickly.
    Therefore, it has also been proposed to perform pressure and temperature measurements using optical techniques such as optical interferometers located at the end of a fiber optic conductor and inserted into the wellbore. However, optical interferometers are very susceptible to temperature changes in their measurements, so that different pressures can sometimes be measured under varying temperature at the same pressure. In addition, only punctual measurements are possible with optical interferometers. The determination of an approximately continuous pressure curve along the entire borehole depth is not possible with known measuring devices.
    It is therefore the object of the invention to realize a method for spatially resolved pressure measurement, which is particularly useful under measuring conditions such as a hydrostatic ambient pressure of up to 1000 bar or temperatures of several hundred degrees. 2/21 · 2 · · · ·
    Celsius is used. Furthermore, it is an object of the invention to provide a corresponding pressure measuring device.
    These objects are achieved by the features of claims 1 and 2. Claim 1 relates to a method for spatially resolved pressure measurement along a pressure range, is provided according to the invention that using a running within a tubular sheath in the longitudinal direction of the sheath glass fiber comprising a fiberglass core, a fiberglass sheath, and an outer protective layer on a length of the arranged along the pressure region, tubular ishotropic pressure acting in an asymmetric pressure load on the lying within the length portion of the glass fiber sheath is converted using a reflection measurement along the glass fiber caused by the asymmetric pressure load birefringence detected in this length and determined from the thus determined , asymmetric pressure load of the pressure acting on the length section is determined.
    The mathematical relationship between the external pressure load on the tubular sheath and the asymmetric load on the fiberglass sheath results from the structural features of the arrangement of the glass fiber within the tubular sheath and the structure of the glass itself and is of course known for a particular arrangement. In other words, the glass fiber is to be arranged within the tubular enclosure in a manner that this mathematical relationship is also known and fixed. This relationship is referred to below as a kinematic defined coupling, so that a predetermined, isotropic pressure load on the tubular casing in a well-defined manner converts into a clear, asymmetric pressure load on the fiberglass jacket. In this way, a pressure load on the tubular sheath can be assigned to a certain, asymmetric load case on the fiberglass sheath. In the reverse manner, it is therefore also possible to conclude clearly from a measured, asymmetrical loading case of the glass fiber jacket on the externally applied pressure on the tubular envelope. Possibilities for structural execution of such a kinematically defined coupling will be shown below. According to the invention, the measurement of the asymmetrical pressure load on the glass fiber sheath within a longitudinal section is carried out by means of a reflection measurement along the glass fiber, wherein the birefringence caused by the asymmetric pressure loading is detected in this longitudinal section. One possibility for reflection measurement is in optical time domain reflectometry (OTDR), for example, or in the OTDR-like optical frequency domain reflectometry (OFDR), which, unlike the OTDR, does not have an optical frequency domain reflectometry Time domain, but in the frequency range 3/21 · # ·· ·· ··
    • · · · · · · · · ···················································. These are reflectance measurements in which a laser light pulse is coupled into the glass fiber and the (Rayleigh) backscatter light is measured over time. The measured signal has a time dependency that can be converted into a location dependency via the group velocity. Thus, a spatially resolved measurement can be realized. Polarization-dependent optical reflectometry (POTDR) is a special type of reflection measurement. It uses a polarizer at the entrance to the fiber and an analyzer arranged at right angles to it. The polarization state of the backscattered light is recorded, from which the beat length or the linear birefringence can be determined. With this method it is possible to determine local values of birefringence along the glass fiber. The local birefringence in turn depends on variables such as the external pressure and / or the temperature and occurs in the reflection signal as a change in slope. The reflection signal itself can be supplied by means of an optical beam splitter to a detector which converts the optical signal into an electrical signal for further evaluation. If the birefringence brought about by the asymmetrical pressure load is detected in a longitudinal section of the glass fiber, the isotropically acting pressure in this longitudinal section can be determined from the asymmetrical pressure load determined in this way via the kinematically defined coupling.
    The invention thus envisages using the glass fiber itself for the pressure measurements and carrying out measurements at many measuring points along the glass fiber, that is to perform a spatially resolved pressure measurement along the glass fiber. Such a type of measurement makes it possible in a cost-effective manner to determine a pressure curve along the glass fiber, that is, for example, the pressure curve within a borehole in which the glass fiber is arranged. Of course, the field of application of the measuring method according to the invention is not limited to boreholes, but is suitable for many applications where under adverse environmental conditions pressure measurements are to be performed, such as in pipelines or other pressure-loaded facilities.
    With regard to the apparatus implementation of the method according to the invention, a device for spatially resolved pressure measurement along a pressure range is proposed, in which. The invention provides that it is formed from a glass fiber comprising a Glasfaserkem, a fiberglass jacket, and an outer protective layer, the Gläsfasermantel and / or its protective layer within a isotropic pressure-loaded tubular casing in the longitudinal direction of the envelope is arranged azentrisch extending, wherein the Glass fiber along a portion of its peripheral region rests against the inner surface of the isotropically pressure-loaded envelope and / or rests or is formed on at least one support fiber, which is within the tubular
    Envelope extends in the longitudinal direction of the envelope extending. Under an isotropic pressure load is understood in the cross-sectional plane of the rohrformigen enclosure along its circumference in its scalar size equal, so direction independent pressure. Under hydrostatic conditions, an isotropic pressure will usually be present, but according to the invention it is crucial to expose the tubular casing directly to the pressure region so that the isotropic pressure also acts directly on the casing, without being distorted by enveloping or other structures.
    The asymmetric load case on the glass fiber sheath is achieved according to the invention by an acentric arrangement of the glass fiber sheath and / or the protective layer of the glass fiber within the tubular sheath. By an acentric arrangement of the glass fiber sheath and / or the protective layer of the glass fiber, it is meant that in a cross section normal to the longitudinal axis of the tubular sheath, the center of the glass fiber sheath or protective layer does not coincide with the center of the tubular sheath. The longitudinal axes of the rohrformigen sheath and the glass fiber thus may be parallel to each other, but not in the same axis. This arrangement can be seen in contrast to a coaxial arrangement of the glass fiber to rohrformigen enclosure in which in a cross section normal to the longitudinal axis of the rohrformigen enclosure the center of the glass fiber coincides well with the center of the rohrformigen enclosure. The glass fiber sheath and the outer protective layer of the glass fiber can be concentric, so that an acentric arrangement of the glass fiber sheath is synonymous with an acentric arrangement of the protective layer. However, the glass fiber could also be manufactured in such a way that the glass-fiber sheath does not run concentrically within the protective layer, for example by the cross-section of the protective layer not being circular at all, but rather approximately triangular. In this case, the protective layer of the glass fiber could be centered within the tubular sheath, although the glass fiber sheath centers centrally within the tubular sheath. Even in such a case, however, an isotropic pressure load on the tubular sheathing can be converted into an asymmetric load on the glass fiber sheath.
    If the glass fiber rests along a portion of its peripheral region on the inner surface of the isotropically pressure-loaded casing, there is a direct pressure transfer from the casing to the glass fiber. In the case of a direct contact of the glass fiber on the inner surface of the envelope, it is preferably proposed that two Stützfasem are provided, each abut along a portion of their peripheral regions on the inner surface of the enclosure and bear along further portions of their peripheral regions of the respective other support fiber and the glass fiber or at her
    I 5/21
    I ··············································································································································································· If the glass fiber and the Stützfasem are performed with the same diameter, form in this constellation, the centers of the three fibers in a cross-section an equilateral triangle, so that the asymmetric pressure load on the glass fiber due to simple geometric relationships can be easily calculated from the externally applied, isotropic pressure , The glass fiber is manufactured with concentric fiberglass core, fiberglass jacket and protective layer. Furthermore, a secure, acentric fixation of the glass fiber within the sheath and thus a locally defined position of the glass fiber within a cross-sectional plane of the tubular sheath is ensured. The tubular enclosure may be a stainless steel tube, for example.
    The kinematically defined coupling can thus be achieved by contacting the glass fiber along a section of its peripheral region on the inner surface of the envelope, ie by direct, mechanical pressure transmission. According to a further embodiment, it is proposed in contrast to this that the glass fiber and the at least one support fiber are arranged in a transversely isotropically pressure-conducting medium which fills the envelope. In this case, no direct contact of the glass fiber on the inner surface of the tubular casing is necessary, instead, the pressure is transmitted via the transversely isotropic pressure-conducting medium. A transversely isotropic pressure-conducting medium is understood here to mean a medium which forwards a pressure in the cross-sectional plane of the tubular envelope without directional dependence, for example an incompressible gel or special plastics and polymeric materials such as acrylates. This design allows a further reduction in the outer diameter of the tubular casing to below 0.3mm. However, this embodiment requires the molding of the glass fiber on at least one support fiber to ensure an asymmetric pressure load on the glass fiber, which in this case results solely from the fact that the glass fiber along at least a portion of its peripheral area is formed on at least one support fiber, and with the remaining Part of its peripheral area is exposed. To ensure an acentric storage of the inner diameter of the tubular casing is chosen correspondingly small. The glass fiber is in turn made with concentric glass fiber core, glass fiber sheath and protective layer.
    According to a further embodiment, it is proposed that the tubular casing has openings along its peripheral area. In this case, neither a direct contact of the glass fiber to the inner surface of the rohrformigen enclosure is required, nor a pressure-conducting medium within the tubular enclosure. Instead, an external fluid or gas of the pressure region may enter the tubular enclosure through the openings and exert immediate pressure on the optical fiber. These 6/21 • ···· ··········· ·
    Embodiment, however, also requires the molding of the glass fiber on at least one support fiber to ensure an asymmetric pressure load on the glass fiber, which in this case results from the fiber being integrally formed along at least one support fiber along a portion of its peripheral region, and the remaining portions its peripheral region is directly exposed to the pressure of the external fluid.
    Preferably, at least one of the two Stützfasem is another glass fiber, which can be designed as a multi-mode fiber or single-mode fiber and can be used as for spatially resolved temperature measurement. Spatially resolved temperature measurements using glass fibers are known and can be used in the invention to increase the accuracy of the pressure measurement. High temperatures may cause a thermal expansion of the components involved, which may affect the erfmdungsgemäße pressure measurement, especially in those embodiments in which the glass fiber and / or at least one support fiber directly against the inner surface of the tubular casing. Therefore, it is advantageous to have a spatially resolved temperature information for calibrating the pressure measurement.
    Furthermore, it is proposed that the tubular sheath is a cylindrically symmetrical sheath. The envelope, which is cylindrically symmetrical at least in its outer circumference, is advantageous, in particular, for applications under high ambient pressure, since, in the case of an asymmetrical design, the external stresses would lead to deformations and ultimately also to destruction of the envelope.
    However, according to the invention, the asymmetric loading case on the glass fiber can also be achieved by a coaxial arrangement within a tubular sheathing if the tubular sheathing has an elliptical cross section. In this case, for example, a glass fiber could be provided which rests against the inner surface of a tubular envelope having an elliptical cross-section, so that it is stressed asymmetrically despite isotropic pressure loading on the tubular envelope. Therefore, a pressure measuring device is also proposed, which is formed from a glass fiber, which is arranged coaxially within a, in the pressure region isotropically pressure-loaded tubular casing in the longitudinal direction of the casing, wherein the rohrformige sheath has an elliptical cross-section and the glass fiber along sections of its peripheral region the inner surface of the isotropically pressure-loaded envelope rests. 7/21 • · * ·· ·· ······
    The invention will be explained in more detail below on the basis of exemplary embodiments with the aid of the enclosed figures. It show here the
    1 is a schematic representation of a measuring arrangement for carrying out the method according to the invention, as well as for the application of the device according to the invention,
    2 shows a schematic illustration of a first embodiment of a device according to the invention for spatially resolved pressure measurement, in which three glass fibers are arranged within a tubular envelope in contact with their inner surface,
    3 is a schematic representation of the pressure conditions on a glass fiber in an arrangement according to FIG. 2, FIG.
    4 shows a schematic illustration of a further embodiment of a device according to the invention for spatially resolved pressure measurement, in which two glass fibers are formed on one another and arranged inside a tubular envelope,
    Fig. 5 is a schematic representation of another embodiment of a device according to the invention for spatially resolved pressure measurement, in which three glass fibers are integrally formed and arranged within a rohrformigen enclosure, and the
    Fig. 6 is a schematic representation of another embodiment of a device according to the invention for spatially resolved pressure measurement, in which four glass fibers are integrally formed and arranged within a rohrformigen enclosure.
    Reference is first made to Fig. 1, to illustrate the general apparatus test setup for carrying out the method according to the invention, as well as for the application of the inventive device. Via a data processing device 1, a pulse generator 2 is driven, which generates by means of a laser diode 3 light pulses. These laser light pulses are transmitted via an optical beam splitter 4 along the path " A " is coupled via a connector 5 in the glass fiber 11 (see Fig. 2), which is disposed within a tubular sheath 6, as will be explained in more detail. The backscattered light is transmitted from the optical beam splitter 4 along the path " B " a photodetector 7 is supplied, which converts the reflection optical signal into an electrical signal. The electrical signal can be amplified by means of an amplifier 8 and converted by means of an AD converter 9 into a digital signal. The digital reflection signal is finally supplied via the data processing device 1 to an output unit 10. The structure described may of course also vary, but is 8/21
    otherwise known. For applying known reflection measurements to measurement conditions such as an ambient pressure of up to 1000 bar or temperatures of several hundred degrees Celsius, a method and a device for spatially resolved pressure measurement is proposed, as described with reference to the following figures.
    Fig. 2 shows a schematic representation of a first embodiment of a device according to the invention for spatially resolved pressure measurement, in which a glass fiber 11 is disposed within a tubular sheath 6, and two Stützfasem 12a, 12b, each along a portion of their peripheral regions on the inner surface of the enclosure Abut 6 and rest along other sections of their peripheral regions of the respective other support fiber 12a, 12b and the glass fiber 11. The free space 14 between the tubular sheath 6 and the glass fiber 11 and the Stützfasem 12a, 12b may be filled with a protective gas or a gel, but a filler is not necessarily necessary in this embodiment, since the kinematically defined coupling via direct contact of the glass fiber 11 and the Stützfasem 12a, 12b is secured to the enclosure 6. The space 14 could thus also be evacuated. The cylindrically symmetrical, tubular sheath 6 is made approximately as a tight stainless steel tube and may be surrounded by further cladding layers 13, which allow scalability of the pressure measurement. The glass fiber 11 can be made with an outer diameter of its glass fiber sheath 11 'from a few microns to a few hundred microns, but due to current manufacturing limits for the metallic, tubular sheath 6, the glass fiber 11 will have an outer diameter in the range of a few hundred microns, and the tubular casing has an inner diameter which corresponds approximately to two to three times the outer diameter of the glass fiber 11, that is to say in the region of 1 mm. The device according to the invention is exposed as shown in FIG. 2 a pressure range 15, as it occurs approximately within an oil well. On the outer circumference of the tubular sheath 6 thus sometimes acts a high hydrostatic pressure, which is due to the small outer diameter of the tubular sheath 6 and its cylindrical symmetry as isotropic pressure, as indicated in Fig. 2 by the small, radially extending arrows is so, as a radially acting pressure, but the same scalar value along the outer circumference of the sheath 6 has. The isotropy of the applied pressure, that is a symmetrical pressure in its scalar size along the circumferential area of the tubular envelope, can be achieved the better, the smaller the outer diameter of the tubular envelope is, for example less than 1.5 mm, preferably less than 0.5 mm ,
    The glass fiber 11 has a fiber cladding 11 '(" cladding "), as well as a fiberglass core 11 " (" core "). Furthermore, it is provided with an outer protective layer 16 ("coating") 9/21 · · St
    • · '
    whose thickness and material can vary. Protective layers 16 made of carbon or a metallic material, for example, which are used in the context of the invention predominantly in the high-temperature range, are known. At lower temperatures, polymeric materials such as acrylates can be used for the protective layer 16, or polyimides as a higher grade material. In the present application, the term " glass fiber " being understood to include a fiberglass jacket 1Γ, a glass fiber core 11 &, and a protective layer 16 of varying material and thickness, but no further layers, such as a " jacket " are known. In particular, the use of conventional plastics should be avoided when using the device according to the invention at high temperatures. The fiberglass jacket 11 'and the glass fiber core 11 " Guide light using the known principles of total reflection, the structure and composition is known per se. Preferably, however, fiberglass sheath 11 'and glass fiber core 11 " a sudden transition in the respective refractive index. For reflection measurements, so-called single-mode (SM) fibers are generally used. In a single mode (SM) fiber two orthogonal HEn modes are propagatable. Their direction of polarization can be chosen arbitrarily in the x or y direction (HEnx, HEny). These two modes represent the eigenmodes of the polarization of an SM fiber. The electric field vector of a wave propagating in the z direction (in FIG. 2 normal to the leaf plane) can thus be considered as a linear superposition of these two modes in a losslessly assumed SM fiber being represented. Each mode can also be assigned an effective refractive index, as well as a propagation constant, which depends not only on the effective refractive index but also on the (free space) wavelength of the coupled-in light. Both sizes are in ideal SM-Fasem, so in unbent fibers with perfectly circular cross section and free of mechanical stresses, the same size for both modes. In real fibers, however, this is usually not the case; rather, there is a difference in the propagation constants of the two modes, which is also referred to as linear birefringence of the glass fiber 11. Such birefringence in a glass fiber 11 always occurs when there is an anisotropy of the refractive index in the glass fiber core 11 " comes. This anisotropy is caused by a disturbance of the ideal circular symmetry due to geometric deformations, mechanical stresses or external electric or magnetic fields. For example, an elliptical cross-sectional shape leads to a linear birefringence, with polarized light propagating at the fastest rate parallel to the minor axis of this ellipse. Mechanical stresses can also cause an elasto-optical change in the refractive index in the glass fiber 11 and thus linear birefringence. If an asymmetric distribution of forces acts, anisotropy occurs in the distribution of the refractive index. Such loads can also be caused by external effects, such as compressive or tensile forces, as will be explained with reference to FIG. 3. 10/21 • · «
    3 shows in an enlarged view the force relationships of the forces acting on the glass fiber jacket 11 'forces in a configuration according to FIG. 2. The external pressure on the casing 6 is shown in a force Fa, which in Fig. 3 from the left along the x-axis acts. Furthermore, on the fiberglass jacket 11 'of the two support fibers 12a, 12b, the forces F; exercised, each having an x and y component. The angle α between the force Fa and the force F; is greater than the angle β between the forces Fi (the angle α is 150 ° and the angle β is 60 °). The geometric analysis shows that, although the sum of the forces disappears in the y-direction, but not the sum of the forces in the x-direction, so that an asymmetric load on the fiberglass jacket 11 'acts. The deformation of the fiberglass sheath 11 'and the fiber optic core 11 " locally causes a birefringence that can be measured. On the other hand, since the geometrical relationships are well known, it is possible, with known birefringence, to deduce the distribution of forces of Fa and Fi, and, subsequently, the applied external pressure. Since the locally present birefringence can be measured in a spatially resolved manner, the applied pressure can also be determined spatially resolved.
    The two Stützfasem 12a, 12b may be designed as a multi-mode fiber or single-mode fiber to perform about spatially resolved temperature measurements that can be used for a correction of the locally measured pressure. High temperatures can namely cause a thermal expansion of the sheath 6, the glass fiber 11, the Stützfasem 12a, 12b, as well as a possible filler in the free space 14, which may affect the pressure measurement according to the invention. Therefore, it is advantageous to have a spatially resolved temperature information for calibrating the pressure measurement. One of the two Stützfasem 12a, 12b could also be used for additional measurements of tensile and compressive loads.
    In FIG. 2, the protective layer 16 is to be regarded as part of the glass fiber jacket 11 'and therefore not explicitly drawn. A very thin version of the protective layer 16 would be conceivable if the rohrformige sheath 6 can be manufactured with correspondingly small diameters. However, it would also be possible to make the protective layer 16 correspondingly thicker in order to be able to increase the diameter of the tubular sheath 6 and thus to facilitate its manufacture. In this case, a polymeric material for the protective layer 16 is preferred if the tubular sheath is made of a metallic material in order to reduce the demands on the manufacturing tolerances. 11/21 • · ♦ ♦
    However, in the sense of the embodiment described above, it would also be possible to provide a single glass fiber 11, the protective layer 16 of which has been produced in such a way that it has a triangular cross-section. The triangular cross-section would be chosen so that an acentric position of either the glass fiber sheath 1Γ and / or the protective layer 16 within the tubular sheath 6 results, ie approximately in the form of a centrally disposed within the tubular sheath 6, equilateral triangle, wherein the glass fiber sheath 11 '(and thus the glass fiber core 11 ") are arranged azentrisch relative to the protective layer 16, or approximately in the form of an acicular within the tubular sheath 6 isosceles triangle, wherein the glass fiber sheath 11' (and thus the glass fiber core 11") relative to the protective layer 16 is arranged centrically. The glass fiber 11 is in turn along a portion of its peripheral region - namely in the corner regions of the triangular protective layer 16 - on the inner surface of the isotropically pressure-loaded enclosure 6 at.
    An alternative embodiment of the device according to the invention is described with reference to FIGS. 4 to 6, in which there is no direct contact of the glass fiber 11 on the inner surface of the tubular sheath 6. In such embodiments, manufacturing tolerances are less decisive, furthermore shows a lower temperature-dependent kit of pressure measurement. Elierbei at least one support fiber 12 is provided which is integrally formed on the glass fiber 11, wherein the at least one support fiber 12 and the glass fiber 11 are embedded in a transversely isotropic pressure-conducting medium 17, such as a high temperature resistant plastic, a gel or a polymeric material such as acrylate , The glass fiber 11 and the at least one support fiber 12 are provided with a protective layer 16, such as carbon or a metallic material. The tubular sheath 6 is formed approximately from copper or steel. In Fig. 4, a support fiber 12a is provided, but it is also conceivable to use configurations with two Stützfasem 12a, 12b (see Fig. 5) or three Stützfasem 12a, 12b, 12c (see Fig. 6), wherein the diameters the glass fiber 11 and the Stützfasem 12 can also be chosen differently. In the configurations shown, in each case an isotropic hydrostatic pressure is converted in a well-defined manner into an asymmetrical distribution of forces on the glass fiber jacket 11 '. It is possible in this case to reduce the size of the arrangement so that the outer diameter of the tubular envelope is only in the range of a few hundred micrometers. The molding of the at least one support fiber 12 on the glass fiber 11 ensures a defined arrangement of the glass fiber 11 relative to at least one support fiber 12, and the resulting asymmetric load case on the fiberglass jacket 11 '. 12/21
    The tubular sheath 6 may have openings, in which case no transversely isotropically pressure-conducting medium 17 is provided, but external fluid, ie a gas or a liquid, penetrates from the pressure area 15 into the interior of the tubular sheath 6 and acts directly on the glass fiber 11. In particular, in this case, the protective layer 16 is to be made of a high temperature resistant material.
    The Stützfasem 12a, 12b, 12c may in turn be designed as a multi-mode fiber or single-mode fiber to perform compensation measurements in terms of temperature or compressive and tensile forces. Furthermore, the respective core and cladding of the optical fiber 11 and the supporting fibers 12 may be made with different geometries, or of different materials, to allow very accurate adjustments to the pressure sensitivity.
    In the examples shown in FIGS. 4 to 6, the glass fiber 11 and the support fibers 12 may be made to have an outer diameter of the order of about one hundred microns, and the tubular sheath 6 may have an inner diameter of about two to three times the (FIG. largest) outer diameter of the glass fiber 11 and the Stützfasem 12, that is about the order of 300 microns.
    With the aid of the invention it is possible to carry out pressure measurements at many measuring points along the glass fiber 11, ie to perform a spatially resolved pressure measurement along the glass fiber 11. Such a type of measurement makes it possible in a cost-effective manner to determine the pressure curve along the arranged in the pressure region 15, tubular sheath 6, that is about the pressure curve within a borehole in which the glass fiber 11 is arranged with its tubular sheath 6, in particular also under measuring conditions such as a hydrostatic ambient pressure of up to 1000 bar or temperatures of several hundred degrees Celsius. Of course, the field of application of the inventive device is not limited to boreholes, but is suitable for many applications where under adverse environmental conditions pressure measurements are carried out, such as in pipelines or other, pressure-loaded facilities. 13/21
    权利要求:
    Claims (8)
    [1]




    Claims 1. A method for spatially resolved pressure measurement along a pressure area (15), characterized in that a glass fiber core (11) is provided by means of a glass fiber (11) running inside a tubular enclosure (6) in the longitudinal direction of the enclosure (6). , an optical fiber cladding (11 '), and an outer protective layer (16), isotropically acting on a length portion of the tubular envelope (6) disposed along the pressure region (15) in an asymmetric compression load on the portion of the glass fiber jacket lying within the longitudinal portion (11 ') is converted, whereby by means of a reflection measurement along the glass fiber (11) caused by the asymmetric pressure load birefringence detected in this length section and determined from the thus determined, asymmetric pressure loading of the pressure acting on the length section.
    [2]
    Device for spatially resolved pressure measurement along a pressure area (15), characterized in that it is formed from a glass fiber (11) comprising a fiberglass core (11 "), a fiberglass jacket (11 '), and an outer protective layer (16) Fiberglass jacket (11 ') and / or its protective layer (16) within a, in the pressure region (15) isotropically pressure-loaded rohrformigen enclosure (6) in the longitudinal direction of the sheath (6) is arranged running acentric, wherein the glass fiber (11) along a portion of their Peripheral region on the inner surface of the isotropically pressure-loaded envelope (6) is present and / or applied to at least one support fiber (12) or molded, which extends within the rohrformigen enclosure (6) extending in the longitudinal direction of the enclosure (6).
    [3]
    3. A device for spatially resolved pressure measurement according to claim 2, characterized in that two Stützfasem (12a, 12b) are provided which abut each along a portion of their peripheral regions on the inner surface of the enclosure (6) and along further portions of their peripheral regions on the other Support fiber (12a, 12b) and the glass fiber (11) abut.
    [4]
    4. An apparatus for spatially resolved pressure measurement according to claim 2, characterized in that the glass fiber (11) and the at least one support fiber (12) in a sheath (6) filling, transversely isotropically pressure-conducting medium (17) are arranged.
    [5]
    5. Device for spatially resolved pressure measurement according to claim 2, characterized in that the rohrformige sheath (6) along its peripheral region has openings. 14/21

    li


    [6]
    6. Device for spatially resolved pressure measurement according to one of claims 2 to 5, characterized in that it is at the at least one support fiber (12a, 12b, 12c) is a further glass fiber.
    [7]
    7. Device for spatially resolved pressure measurement according to one of claims 2 to 6, characterized in that it is in the tubular sheath (6) is a cylindrically symmetrical enclosure (6).
    [8]
    8 Apparatus for spatially resolved pressure measurement along a pressure region (15), characterized in that it is formed from a glass fiber (11) within a, in the pressure region (15) isotropically pressure-loaded robrförmigen enclosure (6) in the longitudinal direction of the sheath (6) coaxial is arranged extending, wherein the rohrformige sheath (6) has an elliptical cross-section and the glass fiber (11) along portions of its peripheral region on the inner surface of the isotropically pressure-loaded sheath (6).

    Vienna, on 2 7, NOV. 2012 15/21
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    同族专利:
    公开号 | 公开日
    WO2014082965A3|2014-08-14|
    US20150323405A1|2015-11-12|
    EP2926104A2|2015-10-07|
    WO2014082965A2|2014-06-05|
    CA2892345A1|2014-06-05|
    AT513732B1|2015-05-15|
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    法律状态:
    2016-05-15| MA04| Withdrawal (renunciation)|Effective date: 20160304 |
    优先权:
    申请号 | 申请日 | 专利标题
    ATA1246/2012A|AT513732B1|2012-11-27|2012-11-27|Method for spatially resolved pressure measurement|ATA1246/2012A| AT513732B1|2012-11-27|2012-11-27|Method for spatially resolved pressure measurement|
    CA2892345A| CA2892345A1|2012-11-27|2013-11-25|A method for locally resolved pressure measurement|
    US14/647,446| US20150323405A1|2012-11-27|2013-11-25|A Method for Locally Resolved Pressure Measurement|
    EP13796047.2A| EP2926104A2|2012-11-27|2013-11-25|Method for locally resolved pressure measurement|
    PCT/EP2013/074627| WO2014082965A2|2012-11-27|2013-11-25|Method for locally resolved pressure measurement|
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