• 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:
    A measurement system is provided, the measurement system being activated to detect properties within an enclosure based on information detected using fiber optic sensors. A measurement system is provided comprising: an enclosure having at least one wall with an inner surface, and an outer surface; at least one silica-based optical fiber comprising at least one functional optical fiber core and at least one cladding layer; at least one optical fiber interrogation element; at least one transducer arranged to deliver energy; a control device; and a processing element arranged to communicate with the optical fiber interrogator and the controller; the silica-based optical fiber being associated with a wall of the enclosure; the control device being arranged to control the optical fiber interrogator; the control device being further arranged to control the transducer; the processing element being arranged to process information from the optical fiber interrogation element. The present invention has advantages with respect to existing methods for being non-intrusive, the use of optical fibers which are small, light and can provide large numbers of sensing points or distributed sensing capability, and the use of calibration techniques and models or algorithms to improve measurements. The combination of different placement patterns or positioning of the fiber optic sensor can enable or facilitate the detection of signals. The system also uses transducers to help generate signals to provide the necessary information.
    公开号:FR3070504A1
    申请号:FR1857636
    申请日:2018-08-24
    公开日:2019-03-01
    发明作者:Rogerio Tadeu Ramos
    申请人:Fibercore Ltd；
    IPC主号:
    专利说明:

    Measuring system
    Field of the invention
    The invention relates to a measurement system, in particular a measurement system for speakers using optical fibers as a detection element.
    Background of the invention
    Obtaining data on the interior properties of a system, such as a pipeline or enclosure, allows for effective monitoring of key system parameters. These parameters may include the flow rate, pressure and composition relating to a fluid within the pipeline or enclosure. Effective monitoring requires the provision of real-time feedback of such parameters, which can be inferred from detected interior properties such as patterns of acoustic, sonic, or vibrational energy.
    Additional examples of monitoring include monitoring the position or movement of materials within the pipeline or enclosure; and monitor the mixing, interaction, or reaction of materials inside the pipeline or enclosure. These materials can take the form of parts or inanimate objects, or they can be living organisms. The system can be used to monitor activity inside a pipe, container, machine enclosure, process chamber, tank, mixer or a room, to give some examples. In cases where the system is used to monitor activity inside a pipe, it may be desirable to monitor the flow of fluids inside the pipe, by monitoring, for example, the flow, speed or composition.
    Activity inside a pipeline or enclosure can generate, emit, diffuse, refract or reflect acoustic, sonic or vibrational energy. Such energy can be detected by sensors placed at or incorporated into the walls of the enclosure. The more sensors available, the better the ability to interpret signals in a useful way, as more information becomes available.
    Currently available technology allows for the incorporation of sensors into a pipeline or conduit, the sensors used include optical fibers. Examples of such systems are described in GB 2 399 412 A and WO 2012/114067 A1, and are mainly used to detect changes in vibrational or acoustic energy associated with the flow of fluid.
    Problems with currently available technology include a lack of sensitivity, robustness and long distance detection.
    It is therefore desirable to provide a measurement system which overcomes the failings of current technology by providing a system with improved sensitivity, improved robustness to difficult applications, and improved performance over long distances.
    Summary of the invention
    A first aspect of the present invention relates to a measurement system comprising: an enclosure having at least one wall with an interior surface, and an exterior surface; at least one silica-based optical fiber comprising at least one functional optical fiber core and at least one cladding layer; at least one interrogation element of optical fiber; at least one transducer arranged to emit energy; a control device; and a processing element arranged to communicate with the fiber optic interrogator and the control device; the silica-based optical fiber being associated with a wall of the enclosure; the control device being arranged to control the fiber optic interrogator; the control device being further arranged to control the transducer; the processing element being arranged to process information originating from the fiber optic interrogation element.
    A system is provided in which at least one optical fiber based on silica is used as a detection element inside an enclosure, which can optionally be a chamber with one or more openings. The optical fiber consists mainly of silica and preferably comprises at least one functional core. Preferably, the optical fiber also comprises a cladding layer, the fiber diameter being the diameter of the outermost cladding layer. In additional embodiments, the optical fiber includes a second cladding layer. In other embodiments, an optical fiber comprising multiple cladding layers can be envisaged.
    The use of optical fibers as sensors is advantageous due to their small size, low weight and the ability to combine many sensors into one fiber or a small number of fibers. Another advantage is the ability to provide distributed measurements along the fiber, i.e. the entire length of the fiber can be used as a sensor or array of sensors. Optical sensors can be based on a variety of techniques such as Rayleigh scattering, Brillouin scattering, Raman scattering, interferometric techniques, attenuation or intensity variation techniques. The fiber optic interrogation element preferably includes fiber optic sensor instrumentation (OFSI) used to poll the fiber optic sensors. The optical fiber interrogation element is arranged to send and receive an optical signal so that the signal can be detected and transformed into useful information. Optionally, the signal received by the optical fiber interrogator from the optical fiber can be in the form of backscattering through techniques such as Rayleigh scattering, Brillouin scattering, Raman scattering, interferometric techniques, attenuation or intensity variation techniques.
    Preferably, the backscatter level is used to inform the system of the internal properties inside the enclosure. The system further comprises a processing element arranged to communicate with the optical fiber interrogation element, the processing element processing data relating to the light received by the optical fiber interrogation element. The processing element is further arranged to communicate with a control device. The controller is arranged to control the fiber optic interrogation element such that the controller controls the interrogation of the optical fiber by the fiber optic interrogation element. The processing element is further arranged to communicate with the control device and can optionally provide instructions to the control device for controlling the interrogation of the optical fiber.
    The fiber optic interrogation element, the processing element and the control device are preferably included in a distributed acoustic detection system (DAS) or a distributed vibration detection instrumentation (DVS). Such instrumentation normally uses Rayleigh scattering and it could be used for the purpose of the present invention.
    The advantage of this system is that the entire length of the optical fiber can be used as a sensor. As such, the system can detect thousands of meters of fiber and can be configured at the DAS or DVS instrumentation at one end of the fiber. The system normally operates through the fiber optic interrogation element by sending one or more pulses of light as an optical signal, normally in the infrared spectrum, into an optical fiber. Part of the light is diffused by the material of the optical fiber and is directed towards the rear towards the DAS or DVS instrumentation. The time it takes for the signal to return to DAS or DVS instrumentation provides information about the distance inside the optical fiber where the broadcast was broadcast. The properties of the optical signal, such as its phase, can then be used to deduce vibration, stress or temperature properties surrounding the optical fiber. DAS or DVS instrumentation can be configured to provide thousands of measurements over the length of the optical fiber.
    The control device of the present system is also arranged to control a transducer included in the system, the control device being arranged to actuate the transducer. Optionally, the processing element is arranged to provide instructions to the control device for actuating the transducer. Upon actuation, the emission of energy from the transducer causes a change in the backscattering properties of the optical fiber, which results in a change in the light received by the optical fiber interrogator. The change in the light received by the fiber optic interrogation element is interpreted by the processing element and is used to deduce the properties of the enclosure. Preferably, the default properties of the system are known by the processing element, so as to allow the processing element to detect a deviation from the default properties.
    A model or algorithm can be used in the processing element to assist in the interpretation of the signals received by the fiber optic interrogation element. A model or algorithm can allow the processing element to use known properties or predicted behavior of what is inside the enclosure and to combine these or this with the detected signals to provide better metrics. Modeling can be assisted by finite element analysis (FEA) techniques and / or analytical or parametric models. Artificial intelligence (AI) techniques can also be used to allow the system to "learn" by experience.
    The use of an efficient model, algorithm and / or calibration can allow the system to distinguish or separate the effects of vibrations or signals from the enclosure from the effects of vibrations or signals from the ambient environment and / or vibrations or signals inside the enclosure. This can be very useful because effects such as tube waves or chamber resonances, as well as noise from the surrounding area, can have detrimental effects on the quality of measurement taken by a system without this capability. In the case of flow measurement, noise from downstream or upstream of the measurement point can also be a problem which can be minimized by the use of a model or algorithm by the element processing and / or effective calibration. Such additional noise could however also be used as a source of information in the present invention, and be treated accordingly.
    The processing element can be included in a computer, and can be used to process information from the fiber optic interrogation element received from the fiber optic sensors. This information can be combined with information from the model and / or algorithm and / or from an efficient calibration to accurately interpret signals received by the fiber optic interrogator and provide measurement with precision. and / or a desired sensitivity.
    Preferably, the optical fiber diameter is between 50 μm and 250 μm. Preferably, at least a part of the optical fiber comprises at least one coating layer.
    The optical fiber diameter includes the optical fiber core and the optical fiber cladding layers. The outside diameter of the fiber is preferably between 50 μm and 250 μm. The fiber diameter is customized for the specific application of the system. The application may also require that the optical fiber of the system further include a coating layer. This coating layer can serve as protection against difficult applications. The coating layer can also be used to provide a detection medium to enhance the detection properties of the optical fiber. In cases where the coating layer can serve to protect the optical fiber, the coating layer may include an elastic modulus in the range of 0.5 to 500 MPa. The coating material may also include, in at least a portion, radiation cured coating materials comprising, but limited to, epoxy acrylates, urethane (meth) acrylates, silicone rubbers (including silicones rtv), polyimides and epoxides. In cases where the coating layer can be used to increase the detection properties of the optical fiber, the coating layer partly comprises at least one element chosen from: a magnetostrictive material, an electrostrictive material, a piezoelectric material or a sensitive material to polarization. The coating material may include polymers charged with particles of a magnetostrictive material, an electrostrictive material, a piezoelectric material or a material sensitive to polarization.
    Preferably, the optical fiber comprises at least one optical network.
    In a preferred embodiment, the optical fiber comprises at least one optical network, such as a Bragg network on fiber (FBG). Optionally, the presence of an optical network can increase the level of backscatter inside the fiber.
    Preferably, the optical fiber is selected from: a single-core optical fiber; a single mode optical fiber; multimode optical fiber; a multicore optical fiber.
    In preferred embodiments, the functional core (s) of the optical fiber is a single-mode optical fiber core. In other embodiments, the functional core (s) of the optical fiber is a multimode optical fiber core.
    According to preferred embodiments of the first aspect of the present invention, the optical fiber is located in at least one location chosen from the following arrangements: adjacent to the outer surface of the enclosure wall; adjacent to the interior surface of the enclosure wall; between the inner surface of the enclosure wall and the outer surface of the enclosure wall; inside the enclosure cavity.
    It is possible to incorporate the optical fiber into the wall of the enclosure. This can be facilitated if a composite material is used at the wall because it can be relatively easy to incorporate optical fibers into a composite material. Some composite materials use fibers, such as glass or carbon fibers, in a resin matrix where optical fibers can be incorporated during manufacturing.
    It is important to place the optical fiber in such a way that it helps a particular type of detection by its position and its placement pattern. The optical fiber can be deposited in different patterns proposed here: a dense envelope, a hollow envelope, a round coil, a longitudinal elongated coil, an elongated transverse coil, a longitudinal corrugation, a transverse corrugation. The coil patterns tend to bring better resolution. The elongated patterns tend to integrate the measurement on the direction of elongation. Wavy patterns tend to provide some of the above two characteristics, but they also help to deal with stress issues at the wall of the enclosure.
    According to preferred embodiments of the first aspect of the present invention, the transducer is located in at least one location chosen from the following arrangements: adjacent to the exterior surface of the enclosure wall; adjacent to the interior surface of the enclosure wall; between the inner surface of the enclosure wall and the outer surface of the enclosure wall; inside the enclosure cavity.
    Preferably, the system further comprises at least one probe of known properties. More preferably, embodiments are proposed in which the probe is arranged to move inside the enclosure. Most preferably, the probe is used for system calibration.
    It may be advantageous to place at least one probe of known properties inside the enclosure during calibration. The probe can be an object of a given material or shape, or a transducer capable of emitting a signal, such as a piezoelectric transducer emitting acoustic or vibratory signals, for example. The probe (s) can be moved or scanned around the enclosure to provide multiple calibration sets. A network of probes can also be used.
    During the calibration process, certain situations or configurations can be simulated to provide the conditions necessary for calibration. In some cases, it is advantageous to place certain materials, fluids or gases in the enclosure during calibration. In some cases, a flow movement of these materials, fluids or gases, or even a mixture of these materials, fluids or gases can also be introduced as probes of known properties in the enclosure to assist the calibration process.
    In preferred embodiments, the default properties of the enclosure, which are used by the processing element to detect a change in the default properties of the enclosure, are calibrated by the use of at least one probe. having known properties. Preferably, the probe is located within at least one region of the enclosure. More preferably, the probe is arranged to move within at least one region of the enclosure. In preferred embodiments, the probe is an active probe. In alternative embodiments, the probe is a passive probe. Most preferable embodiments are those in which the probe can be passive or active, or in which there is more than one type of probe used. Preferably, a passive probe includes a probe which simulates the shape and material of at least part of the desired contents of the enclosure. For example, if the enclosure is used to detect the movement of aqueous solutions in the air, the passive probe could consist of an aqueous gel, or if the purpose of the system is to detect the presence of solids in liquids, the passive probe could consist of the solid desired to be detected. In embodiments, the probe is an active probe, the active probe may include a transducer to emit a signal at different locations inside the enclosure for calibration. The use of an active probe such as that described can be particularly useful if the contents of the enclosure are capable of emitting an energy signal, for example bubbles moving quickly.
    Preferably, the control device is further arranged to control a process of which the enclosure is part
    In preferred embodiments, the controller is not only arranged to control the fiber optic sensor interrogator and the transducer, but is also connected to a method of which the enclosure and the system are part. Possibly such a process can be the supply of water to an enclosure such as a pipe. In such a possible embodiment, the control device can be arranged to control the supply of water to the pipe, the supply of water to the pipe being based on interpretations by the element of signal processing received by the element fiber optic interrogation.
    Preferably, the transducer is chosen from the following transducers: acoustic, vibratory, electrical, magnetic, electromagnetic, optical, mechanical.
    In some cases, there may not be enough signal generated inside the enclosure to be interpreted. Transducers can be placed at the walls of the enclosure to generate a signal necessary for interpretation. Such transducers can be acoustic, vibratory, electrical, magnetic, electromagnetic, optical or mechanical. Transducers can be operated during system operation and / or calibration. Signals to be interpreted can be broadcast, reflected, refracted, or interact in any way with the contents of the speaker. Signals can also interact with the speaker itself and / or the environment.
    Preferably, the processing element is activated to calculate at least one element chosen from: the flow rate, the flow speed, the volume fraction, the filling level, the filling rate, the emptying rate, the mixing rate, the uniformity, the distribution, the position, the movement of the contents of the enclosure, the state of the material of the contents of the enclosure, the speed of chemical reaction, the rate of chemical reaction, the starting a process, stopping a process, failure, creep, distortion, breakage of materials, rupture of materials, bubbling, sparkling, degassing, leaks.
    It is also possible to use information from additional sensors which are not based on optical fibers in order to improve the measurement. These sensors can be placed at the level of the enclosure, in the vicinity of the enclosure or at the level of other process stages involving the operation of the enclosure. Any measurement by the system can include flow rate, flow rate, volume fraction, fill level, fill rate, emptying rate, mixing rate, uniformity, distribution, the position, the movement of the contents of the enclosure, the state of the material of the contents of the enclosure, the speed of chemical reaction, the rate of chemical reaction, the starting of a process, the stopping of a process, failure, creep, distortion, breakage of materials, rupture of materials, bubbling, sparkling, degassing, or leaks.
    Preferably, the enclosure is composed of a material comprising at least in part a material chosen from: a metal, a plastic, a rubber, a ceramic, a mineral, a geomaterial, an organic material, a polymer, a composite material .
    In possible embodiments, the enclosure may include a processing container for use in the food industry. Examples of applications of the present system with such an enclosure include monitoring the addition of ingredients and controlling the mixing process.
    In possible additional embodiments, the enclosure may include a treatment container for use in the oil and gas industry. In the context of the present invention, a pipe is considered to be an enclosure. Possible examples of applications of the present system with such an enclosure include the monitoring of multiphase flows and the control of treatment vessels in refineries.
    In other additional embodiments, the enclosure of the present invention may be a room or a building. Potential examples of applications of the present system with such an enclosure include monitoring the movement of material and people through warehouses or factories, mainly if there are health and safety concerns.
    According to a second aspect of the present invention, the invention relates to an optical fiber housing activated for use in a measurement system as described above.
    detailed description
    Specific embodiments will now be described by way of example only, and with reference to the accompanying drawings in which:
    Figure 1 shows a diagram of a measurement system according to a first aspect of the present invention;
    Figure 2 shows a diagram of a measurement system from Figure 1 comprising different arrangements of optical fibers; and
    Figure 3 shows a diagram of a measurement system from Figure 1 including a probe.
    Referring to Figure 1, a possible application of the present invention is presented. As can be seen, the measurement system 10 comprises an enclosure 12 and an optical fiber 14 positioned adjacent to the enclosure 10. The optical fiber 14 is arranged to supply and receive optical signals coming from the interrogation element of optical fiber 16. a transducer 18 is located at the wall of the enclosure 12. The system further comprises a control device 20 activated to control the optical fiber interrogation element 16 and / or the transducer 18. The processing element 22 is arranged to supply instructions to the control device 20 and to interpret signals received by the fiber optic interrogation element 16.
    The measurement system according to Figure 1 calculates flow measurements, the enclosure being a type of pipe or flow tank. In this case, the enclosure may have two openings, one to leave fluids in the enclosure and the other to leave fluids outside the enclosure. This can be particularly useful for measurement in multiphase flows where there is a mixture of fluids, for example: water, oil and / or gas. The movement of different fluids can generate vibrations of vibration and / or low pressure which could be detected as acoustic signals. The movement of the gas bubbles could generate these signals, which are eventually detected by the system. The transducer 18 is used to generate signals which are reflected, refracted and / or diffused by the interface between fluids. The properties of reflection, refraction and / or scattering of signals depend on the properties inside the pipe, for example the fluid flow rate, or the presence of debris. These properties affect the diffusion characteristics of the optical fiber 14 and this is detected by the optical fiber interrogation element 16 and interpreted by the processing element 22. The change in backscattering of the optical fiber 14 detected by the optical fiber interrogation element 16 is used to deduce therefrom changes in the internal properties by the processing element 22. Depending on the changes made to the detected properties, these changes can cause the processing element 22 to order the controller 20 to command a change in the process to which the system is linked. In the case of the embodiment shown in Figure 1, the control device 20 can be instructed to modify the level of fluid flow to the enclosure 12 which is in the form of a pipe.
    The capacities of the system may depend on the arrangement of the optical fibers associated with the walls of the enclosure. Figure 2 shows examples of different arrangements of the system's optical fiber. The examples of optical fiber arrangements shown are a dense envelope 24, a hollow envelope 26, a round coil 28, a longitudinal elongated coil 30, an elongated transverse coil 32, a longitudinal corrugation 34, a transverse corrugation 36, an envelope with ripple 38. The various arrangements of optical fibers can possibly be connected to others by the pursuit of optical fiber. Figure 2 also illustrates the use of the transducer 18 at the wall of the enclosure. Transducers 18 are used to generate signals detected by their effect on the scattering of light signals inside the fiber optic arrangements 24 to 38.
    In possible embodiments, a probe can be used during operation and / or calibration of the system. An example of such an embodiment is shown in Figure 3. In this embodiment, the probe 40 comprises a material of known properties and is introduced into the enclosure. Transducers 18 are used to transmit signals which must be detected and interpreted by the system. Interaction of signals with probe 40 causes a change in the signals detected by the system when compared to signals detected without the presence of probe 40. The changes can be used to calibrate the system to improve material detection and / or desired properties. Optionally, the probe 40 can be moved inside the enclosure in order to simulate the movement of the desired material inside the enclosure. Such a movement can be controlled, in order to calibrate the system in order to detect the speed or the positioning of a desired material. The probe 40 can be placed, maintained or moved using a support 42.
    Such smart enclosures could take the form of smart pipes that could be used in pipelines, processing plants or even in oil and / or gas wells. This could find applications associated with oil and / or gas, energy, nuclear, factories and / or processing equipment.
    It will be understood that the embodiments described above are given by way of example only and that various modifications thereof can be made without departing from the scope of the invention as defined in the appended claims. For example, other possible applications include monitoring rooms, buildings, houses and / or buildings, the enclosure comprising a room or a building. The system can be used in hospitals, nursing homes or any place where vulnerable people are housed, either by disability or because of their age, such as very old and very young people. In locations where patients or residents are vulnerable, it would be desirable to have an alarm system that detects unusual activities such as someone falling or calling for help, someone trying to open a door, something falling on the floor or even lack of usual activities. The system would be able to provide information on the location of an abnormal event and the nature of the event so that timely and correct assistance can be provided.
    权利要求:
    Claims (16)
    [1" id="c-fr-0001]
    claims
    1. Measuring system comprising:
    an enclosure having at least one wall with an interior surface, and an exterior surface;
    at least one silica-based optical fiber comprising at least one functional optical fiber core and at least one cladding layer;
    at least one interrogation element of optical fiber;
    at least one transducer arranged to emit energy;
    a control device; and a processing element arranged to communicate with the fiber optic interrogator and the control device;
    the silica-based optical fiber being associated with a wall of the enclosure;
    the control device being arranged to control the fiber optic interrogator;
    the control device being further arranged to control the transducer;
    the processing element being arranged to process information originating from the fiber optic interrogation element.
    [2" id="c-fr-0002]
    2. Measuring system according to claim 1, the optical fiber diameter being between 50 μm and 250 μm.
    [3" id="c-fr-0003]
    3. Measuring system according to claim 1 or claim 2, at least a portion of the optical fiber comprising at least one coating layer.
    [4" id="c-fr-0004]
    4. Measurement system according to any one of the preceding claims, the measurement system comprising at least one element selected from the group consisting of: an optical network; a Bragg network on fiber; distributed acoustic detection instrumentation; distributed vibration detection instrumentation; an artificial intelligence implementation designed to allow the measurement system to learn from experience.
    [5" id="c-fr-0005]
    5. Measuring system according to any one of the preceding claims, the optical fiber being a fiber selected from: a single-core optical fiber; a single mode optical fiber; multimode optical fiber; a multicore optical fiber.
    [6" id="c-fr-0006]
    6. Measuring system according to claim 1, the optical fiber being located in at least one location chosen from the following provisions: adjacent to the outer surface of the enclosure wall; adjacent to the interior surface of the enclosure wall; between the inner surface of the enclosure wall and the outer surface of the enclosure wall; inside the enclosure cavity.
    [7" id="c-fr-0007]
    7. Measuring system according to claim 1 or claim 2, the transducer being located in at least one location chosen from the following provisions: adjacent to the outer surface of the enclosure wall; adjacent to the interior surface of the enclosure wall; between the inner surface of the enclosure wall and the outer surface of the enclosure wall; inside the enclosure cavity.
    [8" id="c-fr-0008]
    8. Measuring system according to any one of the preceding claims, the system further comprising at least one probe of known properties.
    [9" id="c-fr-0009]
    9. Measuring system according to claim 8, the probe being arranged to move inside the enclosure.
    [10" id="c-fr-0010]
    10. Measuring system according to claim 8 or claim 9, the probe being a probe selected from: a passive probe; an active probe.
    [11" id="c-fr-0011]
    11. Measuring system according to claim 8, claim 9 or claim 10, the probe being used for the calibration of the system.
    [12" id="c-fr-0012]
    12. Measuring system according to any one of the preceding claims, the control device being further arranged to control a process of which the enclosure is part.
    [13" id="c-fr-0013]
    13. Measuring system according to any one of the preceding claims, the transducer being a transducer chosen from the following transducers: acoustic, vibratory, electrical, magnetic, electromagnetic, optical, mechanical.
    [14" id="c-fr-0014]
    14. Measuring system according to any one of the preceding claims, the processing element being activated to calculate at least one element chosen from: the flow rate, the flow rate, the volume fraction, the filling level. , the filling rate, the emptying rate, the mixing rate, the uniformity, the distribution, the position, the movement of the contents of the enclosure, the state of the material of the contents of the enclosure, the speed chemical reaction rate, chemical reaction rate, starting a process, stopping a process, failure, creep, distortion, breakage of materials, rupture of materials, bubbling, fizzing, degassing, leaks.
    [15" id="c-fr-0015]
    15. Measuring system according to any one of the preceding claims, the enclosure being composed of a material comprising at least in part a material chosen from: a metal, a plastic, a rubber, a ceramic, a mineral, a geomaterial , an organic material, a polymer, a composite material.
    [16" id="c-fr-0016]
    16. Fiber optic housing activated for use in a measurement system according to any one of the preceding claims.
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    同族专利:
    公开号 | 公开日
    DE102018120935A1|2019-02-28|
    GB2566034A|2019-03-06|
    US20190063960A1|2019-02-28|
    CA3015808A1|2019-02-28|
    GB201713904D0|2017-10-11|
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    法律状态:
    2019-08-28| PLFP| Fee payment|Year of fee payment: 2 |
    2020-08-28| PLSC| Search report ready|Effective date: 20200828 |
    2021-05-07| ST| Notification of lapse|Effective date: 20210405 |
    优先权:
    申请号 | 申请日 | 专利标题
    GB1713904.9A|GB2566034A|2017-08-30|2017-08-30|Measurement system|
    GB1713904.9|2017-08-30|
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