• 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:
    Device and method for remote temperature measurement. The invention relates to a remote measured temperature device comprising: an infrared light source where the illumination source is arranged to illuminate luminescent particles whose emission of luminescence depends on the temperature; a lens system for focusing the infrared light source, a rgb color sensor arranged to detect the emission of the luminescent particles and simultaneously supplying a first signal in a first band of wavelengths and a second signal in a second band of lengths cool; a filter for separating from the emission of the luminescent particles the reflection of the infrared light illumination source, and a processing unit configured to calculate a value of a ratio between the first and second signals supplied by the rgb color sensor and determine the temperature. In addition, a method for remote temperature measurement is provided. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2558733A1
    申请号:ES201431197
    申请日:2014-08-05
    公开日:2016-02-08
    发明作者:Joan Josep CARVAJAL MARTÍ；Jaume Massons Bosch；Oleksandr SAVCHUK；María Cinta PUJOL BAIGES；Magdalena AGUILÓ DÍEZ；Francesc Díaz González
    申请人:Universitat Rovira i Virgili URV；
    IPC主号:
    专利说明:

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    emission of the luminescent particles in a second band of wavelengths; supply by means of the sensor, and simultaneously, a first signal related to the emission intensity in the first band of wavelengths and a second signal related to the emission intensity in the second band of wavelengths; calculate a value for a relationship between the first signal and the second signal; and determine the temperature based on the value obtained.
    According to embodiments of the invention, in the method of this second aspect, luminescent particles can be selected whose luminescence emission is such that the first signal and the second signal have a different behavior with respect to temperature, that is to say against a variation of the temperature.
    According to embodiments of the invention, in the method of this second aspect, luminescent particles can be selected whose luminescence emission is such that the first signal and the second signal have an opposite behavior with respect to temperature In this way, the measurement reliability It can be increased due to the great variation in the relationship between the first and second signals when the temperature varies.
    In some embodiments, the luminescent particles may be doped with lanthanide ions. The particles doped with lanthanide ions can fulfill the condition that the signal related to the emission in the first band of wavelengths and the signal related to the second band of wavelengths have opposite behaviors, also having a great variation in the relationship between the first and the second signal; consequently, reliability can be increased. In addition, they may be suitable for absorbing radiation from the infrared lighting source and can emit in the temperature ranges that can usually be handled for some applications eg temperatures in the range 10-70 ° C that can usually be handled in applications Biological These types of particles can also be biocompatible, facilitating their application in biological elements.
    In some specific embodiments, the lanthanide ions may be selected from the group comprising Iterbium (Yb3 +), Erbium (Er3 +), Tulio (Tm3 +), or Holmium (Ho3 +).
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    In a third aspect of the invention a kit can be provided. The kit may comprise luminescent particles configured to vary the luminescence as a function of temperature, in different temperature ranges, and a device for remote temperature measurement in accordance with the first aspect of the invention.
    Other objects, advantages and features of embodiments of the invention will be apparent to the person skilled in the art from the description, or can be learned with the practice of the invention.
    BRIEF DESCRIPTION OF THE DRAWINGS
    Particular embodiments of the present invention will now be described by way of non-limiting example, with reference to the accompanying drawings, in which:
    Figure 1 is a graph showing the evolution of the intensity of the emission of the luminescent particles with the temperature in an embodiment of the invention;
    Figure 2 is a graph showing the evolution of the intensity of the emission of the luminescent particles with the temperature in another embodiment of the invention;
    Figure 3 shows a section of the remote temperature measurement system according to an embodiment of the invention.
    Figure 4 is a graph showing the superposition of the intensity of the emission band of the luminescent particles for a given temperature and a first emission band of wavelengths and a second emission band of wavelengths of the color sensor RGB in an embodiment of the invention
    Figure 5 is a graph of a pattern that can be used in determining the temperature in embodiments of the invention;
    Figure 6 is a graph showing the superposition of the intensity of the emission band of the luminescent particles for a given temperature and a first emission band of wavelengths and a second emission band of wavelengths of the color sensor RGB in another embodiment of the invention;
    Figure 7 is a graph of a pattern that can be used in determining the temperature in other embodiments of the invention.
    DETAILED EXHIBITION OF REALIZATION MODES
    In embodiments of the present invention, a method of remote temperature measurement can be based on the use of luminescent particles, for example luminescent nanoparticles, whose fluorescence light emission properties vary with temperature.
    The particles are applied to a surface or inside a transparent body of which the temperature is to be measured, so that they acquire the same temperature as the surface or the body, and are illuminated with a source of infrared radiation illumination. As a consequence of this illumination, the particles emit a spectrum, the intensity of which depends on the temperature, which can be detected. The temperature of the particles can be deduced from the emission spectrum detected, and therefore from the surface or body through the quotient between the intensities of the first and the second signal supplied by a color sensor eg a sensor of the RGB type in two bands of wavelengths.
    By way of example, luminescent particles suitable for use in an embodiment of a remote temperature measurement method according to the present invention are crystalline nanoparticles of GdVO4 co-coupled with Tm3 + (0.2-2%) and Yb3 + (15%) .
    Figure 1 is a graph showing the intensity of the emission of these luminescent nanoparticles as a function of temperature, in an area of the spectrum between 400 and 750 nm and for a temperature range of 301 and 673 K, when the particles are illuminated with an infrared light source with a wavelength of 980 nm.
    Three emission bands can be observed: a first band related to the emission intensity in the red wavelength band may correspond to
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    Element 6 represents the body or surface from which the temperature is to be measured and / or sensed. The element 6 can be of biological or metallic type although embodiments of the invention can be applied to other materials.
    Element 5 represents the luminescent particles whose luminescence emission depends on the temperature. The luminescent particles 5 may be formed by a matrix of crystalline nanoparticles of GdVO4 doped with Tm3 + and Yb3 +, as described above. The result can be prepared by using NH4VO3 and lanthanide nitrates as reactants. The first step may comprise a sol-gel type process, this sol-gel type process refers to the preparation of the solution (distilled in water, 40 ml) of the amounts that may be required of lanthanide nitrates and NH4VO3. The pH can be adjusted to 7 by adding NH4OH. The resulting dispersion can be hydrothermally treated at 185 ° C for 24 hours. The luminescent particles 5 obtained can be separated by centrifugation and, in addition, they can be washed with distilled water and dried at 120 ° C.
    The particles are applied on the surface of the element 6, for example by adhesion, so that they are at all times at the same temperature as the surface. Alternatively, in transparent bodies eg elements of a biological nature such as cells, the luminescent particles can be incorporated inside the transparent body.
    Element 8 represents an RGB color sensor. The RGB 8 color sensor, eg a Hamamatsu model S9806 sensor, can be formed by an array of photodiodes arranged in an integrated circuit; each of the photodiodes that make up the RGB color sensor is sensitive to a color of light and, therefore, the sensor has a filter for a band of wavelengths in blue, a filter for a band of lengths of wave in red and a filter for a band of wavelengths in green.
    The RGB 8 color sensor can have 12 bits of digital output and can be set in two sensitivity modes, a high sensitivity mode that can allow a 9 x 9 photodiode array and a low sensitivity mode that can allow a 3-matrix x 3 photodiodes.
    The wavelength band in red can be defined between 590 and 720 nm. The wavelength band in the green can be defined between 510 and 590 nm. The wavelength band in blue can be defined between 400 and 510 nm. In other examples of sensors, the wavelength bands in red, green and blue can be defined in ranges other than wavelengths.
    As a concrete and non-limiting example, the RGB color sensor can have the following characteristics:
    -12 bits digital output;
    - Simultaneous measurement for wavelengths in red, green and blue;
    -Sensitivity ratio 1: 9;
    -3.3V operating voltage
    The sensor 8 is arranged to detect the emission of the particles 5, and emit three signals: a first signal, related to the emission intensity detected by the sensor in the wavelength band in red, a second signal, related to the emission intensity detected by the sensor in the blue wavelength band and a third signal, related to the emission intensity detected by the sensor in the green wavelength band.
    Element 4 represents a filter, eg a dichroic mirror, to separate the reflection of the light source from the emission of the luminescent particles, so that the emission supplied to the sensor 8 can be free of noise and / or interference .
    The device 1 can also comprise a processing unit 2 to treat the signals emitted by the RGB color sensor and determine from this treatment the temperature of the surface to be measured.
    The processing unit 2 can be connected to a viewing element 9, eg a display to show the determined temperature and optionally other data.
    An example of the operation of the sensor 8 will be described in more detail below, as well as the treatment of the sensor signals to obtain the temperature.
    Figure 4 illustrates the superposition of the filters of the RGB 8 sensor for a first band of wavelengths in blue and a second band of wavelengths in red with the emission intensity of the luminescent particles of GdVO4 co-coupled with Yb3 + and Tm3 + for a given temperature in these two bands. The graph is purely illustrative since to facilitate the representation an approximate form of the emission intensity has been drawn. In addition, the emission values of the luminescent nanoparticles may change depending on the type of material used. Filters for wavelength bands can also change depending on the type of color sensor used. In this specific example, the emission intensity of wavelengths in red is not centered with the maximum detection intensity of the RGB color sensor. However, it does remain partially within the filter's detection queue, so the filter will integrate part of the emission.
    The sensor 8 integrates the emission intensity in each band (that is, for each band of wavelengths it calculates the area that remains under the emission curve), and emits signals representative of the values obtained: a first signal S1 corresponding to the integral of the emission in the red, and a second signal S2 that corresponds to the integral of the emission in the blue.
    These two signals can be supplied to the processing unit 2, which can calculate a value for a relationship between the first signal S1 and the second signal S2 and determine the temperature based on the value obtained.
    For example, the processing unit 2 can calculate the value of the ratio S1 / S2 between the two signals. To determine the temperature corresponding to the obtained S1 / S2 value, the processing unit can compare this value with a predetermined standard: this standard has been previously obtained, for example in a device calibration stage.
    Figure 5 shows by way of example a predetermined pattern, in this case a pattern corresponding to a device comprising a lighting source at 980 nm and with a power of 600 mW, an RGB color sensor with filters such as those represented in the Figure 4, and using crystalline particles of GdVO4 codopated with Tm3 + (0.2-2%) and Yb3 + (15%).
    As can be seen in the graph of Figure 5, if for example the value of the S1 / S2 ratio between the sensor signals is 1,045 then the temperature of the particles, and therefore of the surface, is 500 K.
    The system calibration process can be carried out through steps described below: Firstly, the particles are introduced into an oven that controls the temperature with an accuracy of  0.1 ºC. The luminescent particles are then illuminated by means of an infrared light source. Through the RGB color sensor a certain number of measurements are made, at different temperatures that will be known through the thermal characterization of the oven. In this way the first and second signals related to the emission are obtained.
    In some embodiments, the measurement at a certain temperature can be repeated a certain number of times to improve the accuracy of the measurement. From this data, the standard curve that can allow the temperature to be determined through the emission of these particles detected with the RGB color sensor in any other situation is represented. Figures 5 and 7 are examples of these standard curves.
    When a lighting source that can emit at different powers is used, the predetermined pattern will comprise a curve for each power, since the emission of the particles at a certain temperature depends among other parameters on the power with which they are illuminated.
    In the calibration process, the medium that surrounds the luminescent particles can influence the accuracy with which their temperature can be determined, so that the calibration operation must be performed in a single medium eg air, liquid.
    Figure 6 illustrates the superposition of the filters of the digital sensor 8 for a first band of wavelengths in red and a second band of wavelengths in green with the emission intensity of NaYF4 luminescent particles co-coupled with Yb3 + and Er3 + for a given temperature in these two bands. The graph is purely illustrative since to facilitate the representation an approximate form of the emission intensity has been drawn. In addition, the emission values of the luminescent nanoparticles may change depending on the type of material used. Filters for wavelength bands can also change depending on the type of color sensor used.
    The sensor 8 integrates the emission intensity in each band (that is, for each band of wavelengths it calculates the area that remains under the emission curve), and emits signals representative of the values obtained: a first signal S1 corresponding to the integral of the emission in the red, and a second signal S2 that corresponds in this case to the integral of the emission in the green.
    These two signals can be supplied to the processing unit 2, which can calculate a value for a relationship between the first signal S1 and the second signal S2 and determine the temperature based on the value obtained.
    For example, the processing unit 2 can calculate the value of the ratio S1 / S2 between the two signals. To determine the temperature corresponding to the obtained S1 / S2 value, the processing unit can compare this value with a predetermined standard: this standard has been previously obtained, for example in a device calibration stage.
    Figure 7 shows by way of example the predetermined pattern, in this case a pattern corresponding to a device comprising a lighting source at 980 nm and with a power of 600 mW, an RGB color sensor with filters such as those represented in the Figure 3, and using crystalline particles of NaYF4 codopated with Er3 + and Yb3.
    As can be seen in the graph of Figure 7, if for example the value of the S1 / S2 ratio between the sensor signals is 1,035 then the temperature of the particles, and therefore of the surface, is approximately 425 K.
    The structure and operation of the calibration stage may be the same as that described for Figure 5.
    As you can see, the pattern is generated as a graph between the temperature and the relationship between the first and the second signal. In some cases the relationship between the first and the
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    权利要求:
    Claims (1)
    [1]
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    同族专利:
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    ES2558733B1|2016-11-16|
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    引用文献:
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    ES201431197A|ES2558733B1|2014-08-05|2014-08-05|Device and method for remote temperature measurement|ES201431197A| ES2558733B1|2014-08-05|2014-08-05|Device and method for remote temperature measurement|
    PCT/ES2015/070605| WO2016020571A1|2014-08-05|2015-08-04|Device and method for remote temperature measurement|
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