WO2010103999A1 - Fluorescence temperature sensor - Google Patents

Fluorescence temperature sensor Download PDF

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Publication number
WO2010103999A1
WO2010103999A1 PCT/JP2010/053608 JP2010053608W WO2010103999A1 WO 2010103999 A1 WO2010103999 A1 WO 2010103999A1 JP 2010053608 W JP2010053608 W JP 2010053608W WO 2010103999 A1 WO2010103999 A1 WO 2010103999A1
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Prior art keywords
optical fiber
fluorescence
excitation light
light
transmission
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PCT/JP2010/053608
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French (fr)
Japanese (ja)
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静一郎 衣笠
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株式会社山武
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
    • G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
    • G01K11/3206—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres at discrete locations in the fibre, e.g. using Bragg scattering
    • G01K11/3213—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres at discrete locations in the fibre, e.g. using Bragg scattering using changes in luminescence, e.g. at the distal end of the fibres

Definitions

  • the present invention relates to a fluorescence temperature sensor that measures temperature using a phosphor whose fluorescence characteristics change with temperature.
  • Fluorescent temperature sensors using phosphors are widely used as temperature sensors (see, for example, Patent Document 1).
  • This fluorescence temperature sensor measures temperature by using a phosphor whose fluorescence characteristics change with temperature. Specifically, the fluorescent light generated by the phosphor is detected by irradiating the phosphor with excitation light from a light source. And temperature is measured by the change of fluorescence characteristics, such as the fluorescence lifetime of the detected fluorescence.
  • the optical fiber that guides the excitation light and the optical fiber that guides the fluorescence are configured using the same type of optical fiber.
  • the fluorescence wavelength emitted from the phosphor of the fluorescence temperature sensor is longer than the wavelength of the excitation light.
  • an optical fiber that guides the excitation light and an optical fiber that guides the fluorescence are used.
  • the transmission efficiency of either excitation light or fluorescence is degraded, and it is necessary to increase the amount of excitation light in the light source in order to secure the amount of light, which is a burden on the light source There was a problem that it took.
  • a bundle optical fiber is used to connect to different types of optical fibers, so that a mismatch in the core area of the optical fiber or an optical axis shift occurs, and the bundle optical fiber Since light leaks at the connection port, the transmission efficiency of excitation light or fluorescence decreases. For this reason, there is a problem that it is necessary to increase the amount of excitation light from the light source, which places a burden on the light source.
  • the present invention has been made to solve the above-described problems, and provides a fluorescence temperature sensor capable of efficiently detecting fluorescence without increasing the emission intensity of excitation light in a light projecting unit. It is an object.
  • a fluorescence temperature sensor includes a phosphor that emits fluorescence according to the intensity of irradiated light, a light projecting unit that projects excitation light onto the phosphor, and a light receiving unit that receives fluorescence emitted from the phosphor.
  • the present invention since it is configured as described above, it is possible to efficiently detect fluorescence without increasing the emission intensity of the excitation light in the light projecting unit by increasing the transmission efficiency of the entire optical fiber.
  • a fluorescence temperature sensor 1 is brought into contact with a surface to be measured, a sensor probe 2 for emitting fluorescence according to temperature, and excitation light is projected onto the sensor probe 2. And a sensor module 3 for measuring the temperature of the surface to be measured from the amount of the received light.
  • the sensor probe 2 guides the phosphor 4 that emits fluorescence by the excitation light projected from the sensor module 3 and the excitation light projected by the sensor module 3 to the phosphor 4.
  • the optical fiber 5 for guiding the fluorescence emitted by the phosphor 4 to the sensor module 3, the cover 6 provided at the tip of the sensor probe 2 and covering the phosphor 4, and the optical fiber 5 are not damaged. It is comprised with the protective tube 7 to protect.
  • the optical fiber 5 that connects the sensor probe 2 and the phosphor 4 provided in the sensor module 3 includes an excitation light transmitting optical fiber 5a and a fluorescence transmitting optical fiber 5b.
  • the excitation light transmitting optical fiber 5 a is for guiding the excitation light projected from the light projecting unit 9 provided in the sensor module 3 to the phosphor 4.
  • the pumping light transmitting optical fiber 5a is made of a plastic optical fiber.
  • the fluorescence transmitting optical fiber 5b is for guiding the fluorescence emitted from the phosphor 4 to the light receiving unit 10 provided in the sensor module 3.
  • the fluorescent transmission optical fiber 5b is composed of a multicomponent glass optical fiber.
  • the sensor module 3 includes a light projecting unit 9 for projecting excitation light onto the phosphor 4 provided on the sensor probe 2 by the driving unit 8, and a phosphor 4 provided on the sensor probe 2.
  • the light receiving unit 10 for receiving the fluorescence emitted by the light receiving unit 10 and the processing unit 11 for calculating the temperature of the surface to be measured based on the amount of light received by the light receiving unit 10.
  • the operation of the fluorescence temperature sensor 1 configured as described above will be described.
  • the surface of the cover 6 in which the phosphor 4 provided at the tip of the sensor probe 2 of the fluorescence temperature sensor 1 is housed is brought into contact with the surface to be measured.
  • excitation light is projected from the light projecting unit 9 onto the phosphor 4.
  • the phosphor 4 emits fluorescence by the excitation light projected from the light projecting unit 9.
  • the light receiving unit 10 receives the fluorescence emitted by the phosphor 4.
  • the amount of light received by the light receiving unit 10 at this time is measured by the processing unit 11 one by one.
  • the light projecting unit 9 stops projecting the excitation light to the phosphor 4. Thereby, the phosphor 4 is quenched.
  • the extinction speed of the phosphor 4 increases as the temperature increases.
  • the processing unit 11 measures the extinction speed of the phosphor 4 to measure the temperature of the surface to be measured.
  • FIG. 2 is a diagram showing the attenuation of light in the excitation light transmitting optical fiber 5a and the fluorescence transmitting optical fiber 5b in the first embodiment of the present invention.
  • a ruby is used as the phosphor 4
  • a plastic optical fiber polymethyl methacrylate (PMMA)
  • PMMA polymethyl methacrylate
  • 2 shows attenuation amounts of excitation light and fluorescence.
  • the wavelength of the fluorescence emitted by the phosphor 4 (for example, 690 nm to 700 nm) is longer than the wavelength of the excitation light projected by the light projecting unit 9 (for example, 560 nm to 590 nm). Therefore, if the excitation light transmitting optical fiber 5a that guides the excitation light and the fluorescence transmission optical fiber 5b that guides the fluorescence are formed of the same optical fiber, the transmission efficiency of either the excitation light or the fluorescence deteriorates. .
  • the attenuation when the excitation light is guided by the plastic optical fiber is, for example, 0.08 dB / m
  • the attenuation when the excitation light is guided by the multicomponent glass optical fiber is, for example, 0.18 dB / m. Therefore, it is possible to improve the transmission efficiency by using a plastic optical fiber for the excitation light transmitting optical fiber 5a that guides the excitation light.
  • the attenuation when the fluorescence is guided by the plastic optical fiber is, for example, 0.35 dB / m
  • the attenuation when the fluorescence is guided by the multi-component glass optical fiber is, for example, 0.2 dB / m. is there. Therefore, it is possible to improve the transmission efficiency by using a multi-component glass optical fiber for the fluorescent transmission optical fiber 5b that guides the fluorescence.
  • the optical fiber that guides the excitation light and the fluorescence is set according to the wavelength of the excitation light and the wavelength of the fluorescence, thereby transmitting the excitation light and the fluorescence. Since the efficiency can be increased, it is not necessary to excessively increase the amount of excitation light projected from the light projecting unit 9, and the burden on the light source of the light projecting unit 9 can be suppressed.
  • ruby is used as the phosphor 4
  • a plastic optical fiber and a multicomponent glass optical fiber are used as optical fibers constituting the excitation light transmitting optical fiber 5a and the fluorescence transmitting optical fiber 5b.
  • the optical fiber which comprises the optical fiber 5a for excitation light transmission, and the optical fiber 5b for fluorescence transmission is suitably changed according to the wavelength of excitation light, and the wavelength of fluorescence It is.
  • the material of the excitation light transmitting optical fiber 5a is not limited to the PMMA as long as it does not deteriorate the transmission efficiency with respect to the wavelength of the excitation light of the light projecting unit 9 for emitting fluorescence.
  • the material for the optical fiber 5b for fluorescence transmission may be any material that does not deteriorate the transmission efficiency with respect to the wavelength of the fluorescence emitted by the phosphor, and is not limited to the multicomponent glass.
  • PMMA is used for the excitation light transmitting optical fiber 5a, it is also possible to apply fused silica, rare earth-doped quartz, or fluorine-based resin as the material of the fluorescence transmitting optical fiber 5b in place of the multicomponent glass. is there.
  • FIG. 3 is a view showing the structure of the fluorescence temperature sensor 1 according to the second embodiment of the present invention.
  • optical fibers made of materials suitable for the wavelengths of light to be guided are used as the optical fibers constituting the excitation light transmitting optical fiber 5a and the fluorescence transmitting optical fiber 5b.
  • the fluorescence temperature sensor 1 according to the second embodiment of the present invention uses the same optical fiber material used for the excitation light transmitting optical fiber 5a and the fluorescence transmitting optical fiber 5b.
  • the core area of the fluorescence transmission optical fiber 5b is configured to be larger than the core area of the excitation light transmission optical fiber 5a.
  • the pumping light transmitting optical fiber 5a is formed of, for example, a plastic optical fiber, and the bundle diameter is set to a predetermined diameter, for example, 1 mm in the embodiment.
  • the fluorescent transmission optical fiber 5b is formed of a plastic optical fiber made of the same material as the excitation light transmission optical fiber 5a. As shown in FIG. 3, the bundle diameter is larger than the bundle diameter of the excitation light transmission optical fiber 5a.
  • the predetermined diameter for example, 1.5 mm in this embodiment is configured.
  • the fluorescence temperature sensor 1 since the fluorescence more than the light energy of the excitation light projected from the light projecting unit 9 is not generated, the fluorescence intensity of the fluorescence received by the light receiving unit 10 is increased.
  • the transmission efficiency By increasing the bundle diameter of the fluorescent transmission optical fiber 5b with respect to the bundle diameter, the transmission efficiency can be increased.
  • the core area of the fluorescence transmission optical fiber 5b is changed to the excitation light transmission optical fiber 5a. Since the transmission efficiency of fluorescence can be increased by configuring so as to be larger than the core area, there is no need to excessively increase the amount of excitation light projected from the light projecting unit 9. The burden on the light source can be reduced.
  • the core area (bundle diameter) of the excitation light transmitting optical fiber 5a is exemplified as 1 mm
  • the core area (bundle diameter) of the fluorescence transmitting optical fiber 5b is exemplified as 1.5 mm.
  • the present invention is not limited to this. If the core area of the fluorescence transmission optical fiber 5b is selected to be larger than the core area of the excitation light transmission optical fiber 5a, it is possible to achieve the effect of improving the transmission efficiency.
  • FIG. 4 is a diagram showing the structure of the fluorescence temperature sensor 1 according to Embodiment 3 of the present invention.
  • the sensor probe 2 and the sensor module 3 are connected by the excitation light transmitting optical fiber 5a and the fluorescence transmitting optical fiber 5b.
  • the fluorescence temperature sensor 1 according to the third embodiment for example, when the optical fiber 5 is laid in a narrow region, the excitation light transmitting optical fiber 5a and the fluorescence transmitting light having different core areas using the bundle optical fiber 5c are used. It is configured to be connected to the fiber 5b.
  • the pumping light transmitting optical fiber 5a is made of, for example, a plastic optical fiber. As shown in FIG. 4, the fluorescent light 4 side tip of the pumping light transmitting optical fiber 5a is the pumping light transmitting optical fiber of the bundle optical fiber 5c. The optical axis is aligned with the 5a side and connected by an FC connector or the like. The core shape of the excitation light transmitting optical fiber 5a is circular.
  • the fluorescent transmission optical fiber 5b is made of, for example, a plastic optical fiber. As shown in FIG. 4, the fluorescent transmission optical fiber 5b has a fluorescent material 4 side tip at the fluorescence transmission optical fiber 5b side of the bundle optical fiber 5c. The optical axes are aligned and connected by an FC connector or the like. Further, the core shape of the excitation light transmitting optical fiber 5a is circular.
  • the bundle optical fiber 5c guides the excitation light guided by the excitation light transmitting optical fiber 5a to the phosphor 4, and guides the fluorescence emitted from the phosphor 4 to the fluorescence transmitting optical fiber 5b. is there. Further, the core shape of the bundle optical fiber 5c on the excitation light transmitting optical fiber 5a side and the core shape on the fluorescence transmitting optical fiber 5b side are circular.
  • the core area S SFO on the optical fiber 5b side is configured and connected so as to satisfy S IF ⁇ S SFI ⁇ S SFO ⁇ S OF .
  • FIG. 5 shows the ratio of the fluorescence intensity to the bundle diameter conditions (a) to (d) of the excitation light transmitting optical fiber 5a, the fluorescence transmitting optical fiber 5b, and the bundle optical fiber 5c according to the third embodiment of the present invention. It is the figure shown on the basis of the fluorescence intensity at the time of each bundle diameter condition of a).
  • the diameter of the optical fiber shown in FIG. 5 is an exemplification, and other values can be taken.
  • the core shapes of the excitation light transmitting optical fiber 5a, the fluorescence transmitting optical fiber 5b, and the bundle optical fiber 5c are circular.
  • the bundle diameter of the bundle optical fiber 5c on the excitation light transmitting optical fiber 5a side and the bundle diameter on the fluorescence transmitting optical fiber 5b side are both 1.2 mm. Further, an LED is used as the light projecting unit 9 that projects the excitation light, and a photodiode is used as the light receiving unit 10.
  • the bundle diameter of the excitation light transmission optical fiber 5a is 1 mm and the bundle diameter of the fluorescence transmission optical fiber 5b is 1 mm
  • the bundle light on the fluorescence transmission optical fiber 5b side is shown. Since the bundle diameter of the fluorescence transmission optical fiber 5b is smaller than the bundle diameter of the fiber 5c, the fluorescence leaks at the connection port between the fluorescence transmission optical fiber 5b and the bundle optical fiber 5c, and the fluorescence intensity decreases. .
  • the excitation light transmitting optical fiber is used. Since the bundle diameter of the excitation light transmitting optical fiber 5a is larger than the bundle diameter of the bundle optical fiber 5c on the 5a side, the excitation light leaks at the connection port between the excitation light transmitting optical fiber 5a and the bundle optical fiber 5c. As a result, the excitation light intensity decreases. Further, since the bundle diameter of the fluorescent transmission optical fiber 5b is smaller than the bundle diameter of the bundle optical fiber 5c on the fluorescent transmission optical fiber 5b side, the connection port between the fluorescent transmission optical fiber 5b and the bundle optical fiber 5c is used. The fluorescence leaks and the fluorescence intensity decreases.
  • the bundle diameter of the excitation light transmitting optical fiber 5a is 1.5 mm and the bundle diameter of the fluorescence transmitting optical fiber 5b is 1.5 mm, Since the bundle diameter of the excitation light transmitting optical fiber 5a is larger than the bundle diameter of the bundle optical fiber 5c on the optical fiber 5a side, the excitation light is transmitted at the connection port between the excitation light transmitting optical fiber 5a and the bundle optical fiber 5c. Leakage occurs and the excitation light intensity decreases.
  • the bundle diameter of the excitation light transmitting optical fiber 5a is 1 mm and the bundle diameter of the fluorescence transmitting optical fiber 5b is 1.5 mm, that is, the excitation light transmitting light.
  • the bundle diameter is increased in the order of the bundle diameter of the fiber 5a, the bundle diameter of the bundle optical fiber 5c, and the bundle diameter of the fluorescent transmission optical fiber 5b, there is no loss of excitation light and fluorescence between the connections, and it is most efficient.
  • the fluorescence can be guided to the light receiving unit 10.
  • the core of the pumping light transmitting optical fiber 5a is connected in the connection between the pumping light transmitting optical fiber 5a and the fluorescence transmitting optical fiber 5b and the bundle optical fiber 5c.
  • the core area increases in the order of the area, the core area of the bundle optical fiber 5c on the excitation light transmitting optical fiber 5a side, the core area of the bundle optical fiber 5c on the fluorescent transmitting optical fiber 5b side, and the core area of the fluorescent transmitting optical fiber 5b.
  • the excitation light transmitting optical fiber 5a, the fluorescence transmitting optical fiber 5b, and the bundle optical fiber 5c have been described as having a circular core shape, but the present invention is not limited thereto. Instead of this, an optical fiber having a rectangular core may be used.
  • the excitation light transmitting optical fiber 5a and the fluorescence transmitting optical fiber 5b are described using optical fibers made of the same material.
  • the present invention is not limited to this. Instead, the excitation light transmitting optical fiber 5a and the fluorescence transmitting optical waveguide 5b may be formed of optical fibers made of different materials.
  • the core area (bundle diameter) of the excitation light transmitting optical fiber 5a is 1 mm
  • the core area (bundle diameter) of the bundle optical fiber 5c is 1.2 mm
  • the fluorescent transmitting optical fiber is 1.5 mm
  • the core area of the excitation light transmitting optical fiber 5a: the core area of the bundle optical fiber 5c: the bundle diameter of the fluorescent transmitting optical fiber 5b is set to 0.5 mm: 1.0 mm: 1.5 mm, or 1.5 mm: Even if it is set to 1.8 mm: 2.0 mm, the transmission efficiency can be improved.
  • the relationship of the core area A of the excitation light transmitting optical fiber 5a: the core area C of the bundle optical fiber 5c: the core area B of the fluorescent transmitting optical fiber 5b is set so that A ⁇ C ⁇ B. That's fine.
  • the pumping light transmitting optical fiber 5a and the fluorescence transmitting optical fiber 5b are described as bundled optical fibers.
  • the present invention is not limited to this, and the pumping light transmitting optical fiber 5a and The fluorescence transmission optical fiber 5b may be formed of a single-core optical fiber.
  • the excitation light transmission optical fiber 5a is formed of a single-core optical fiber
  • the fluorescence transmission optical fiber 5b is a bundle of light. You may comprise combining, such as comprising with a fiber.
  • SYMBOLS 1 Fluorescence temperature sensor, 2 ... Sensor probe, 3 ... Sensor module, 4 ... Phosphor, 5 ... Optical fiber, 5a ... Excitation light transmission optical fiber, 5b ... Fluorescence transmission optical fiber, 5c ... Bundle optical fiber, 6 ... Cover, 7 ... Protective tube, 8 ... Drive part, 9 ... Light projecting part, 10 ... Light receiving part, 11 ... Processing part

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)

Abstract

Provided is a fluorescence temperature sensor enabling efficient detection of fluorescence without increasing the intensity of light emitted from an exciting light source. The fluorescence temperature sensor (1) is provided with a fluorescent body (4) emitting fluorescence depending on the intensity of the irradiated light, a light projecting unit (9) for projecting an exciting light onto the fluorescent body (4), a light receiving unit (10) for receiving fluorescence emitted from the fluorescent body, an exciting light transmitting optical fiber (5a) for guiding the exciting light projected by the light projecting unit (9), and an fluorescence transmitting optical fiber (5b) for guiding fluorescence emitted from the fluorescent body (4). The exciting light transmitting optical fiber (5a) has different characteristics from those of the fluorescence transmitting optical fiber (5b).

Description

蛍光温度センサFluorescence temperature sensor
　この発明は、温度により蛍光特性が変化する蛍光体を用いて温度を測定する蛍光温度センサに関するものである。 The present invention relates to a fluorescence temperature sensor that measures temperature using a phosphor whose fluorescence characteristics change with temperature.
　温度センサとして、蛍光体を用いた蛍光温度センサが広く利用されている（例えば、特許文献１参照）。この蛍光温度センサは、温度により蛍光特性が変化する蛍光体を用いることにより温度を測定する。具体的には、光源からの励起光を蛍光体に照射して、蛍光体で発生した蛍光を検出する。そして、検出された蛍光の蛍光寿命などの蛍光特性の変化によって、温度を測定する。この蛍光温度センサでは、励起光を導光する光ファイバと、蛍光を導光する光ファイバとは同一種類の光ファイバを用いて構成されている。 Fluorescent temperature sensors using phosphors are widely used as temperature sensors (see, for example, Patent Document 1). This fluorescence temperature sensor measures temperature by using a phosphor whose fluorescence characteristics change with temperature. Specifically, the fluorescent light generated by the phosphor is detected by irradiating the phosphor with excitation light from a light source. And temperature is measured by the change of fluorescence characteristics, such as the fluorescence lifetime of the detected fluorescence. In this fluorescence temperature sensor, the optical fiber that guides the excitation light and the optical fiber that guides the fluorescence are configured using the same type of optical fiber.
　また、蛍光温度センサに用いられる光ファイバを狭い領域に敷設する場合、柔らかい光ファイバを用いて曲げやすくすることが望ましい。その解決方法として、細い光ファイバの利用が挙げられる。しかしながら、蛍光温度センサでは、励起光の光エネルギ以上の蛍光は発生しないため、蛍光体からの蛍光を受光部に伝送するためには、太い光ファイバを使用することが望ましい。しかしながら、特許文献１に開示される蛍光温度センサでは、１本の光ファイバにより構成されているため、曲げやすさと高い蛍光強度を実現することは難しく、伝送光量の増大と、曲げやすさを目的に、バンドル光ファイバを用いる方法がある（例えば特許文献２参照）。 Also, when an optical fiber used for a fluorescent temperature sensor is laid in a narrow area, it is desirable to make it easier to bend using a soft optical fiber. One solution is to use a thin optical fiber. However, since the fluorescence temperature sensor does not generate fluorescence more than the light energy of the excitation light, it is desirable to use a thick optical fiber in order to transmit the fluorescence from the phosphor to the light receiving unit. However, since the fluorescent temperature sensor disclosed in Patent Document 1 is composed of a single optical fiber, it is difficult to realize bendability and high fluorescence intensity, and the purpose is to increase the amount of transmitted light and bend easily. In addition, there is a method using a bundle optical fiber (for example, see Patent Document 2).
特表平１１－５０８３５２号公報Japanese National Patent Publication No. 11-508352 特開２００２－１３１１７３号公報JP 2002-131173 A
　しかしながら、蛍光温度センサの蛍光体の発する蛍光の波長は励起光の波長よりも長く、特許文献１に開示される蛍光温度センサでは、励起光を導光する光ファイバ及び蛍光を導光する光ファイバを同一種類の光ファイバを用いて構成するため、励起光または蛍光のどちらか一方の伝送効率が悪くなり、光量確保のために、光源での励起光の光量を上げる必要があり、光源に負担がかかるという課題があった。 However, the fluorescence wavelength emitted from the phosphor of the fluorescence temperature sensor is longer than the wavelength of the excitation light. In the fluorescence temperature sensor disclosed in Patent Document 1, an optical fiber that guides the excitation light and an optical fiber that guides the fluorescence are used. Are configured using the same type of optical fiber, the transmission efficiency of either excitation light or fluorescence is degraded, and it is necessary to increase the amount of excitation light in the light source in order to secure the amount of light, which is a burden on the light source There was a problem that it took.
　また、特許文献２に開示される蛍光温度センサでは、バンドル光ファイバを用いて、異種の光ファイバとの接続を行うため、光ファイバのコア面積のミスマッチや光軸ずれが生じ、バンドル光ファイバの接続口で光が漏洩するため、励起光または蛍光の伝達効率が低下する。そのため、光源での励起光の光量を上げる必要があり、光源に負担がかかるという課題があった。 In addition, in the fluorescence temperature sensor disclosed in Patent Document 2, a bundle optical fiber is used to connect to different types of optical fibers, so that a mismatch in the core area of the optical fiber or an optical axis shift occurs, and the bundle optical fiber Since light leaks at the connection port, the transmission efficiency of excitation light or fluorescence decreases. For this reason, there is a problem that it is necessary to increase the amount of excitation light from the light source, which places a burden on the light source.
　この発明は、上記のような課題を解決するためになされたもので、投光部での励起光の発光強度を高めることなく、蛍光を効率よく検出することができる蛍光温度センサを提供することを目的としている。 The present invention has been made to solve the above-described problems, and provides a fluorescence temperature sensor capable of efficiently detecting fluorescence without increasing the emission intensity of excitation light in a light projecting unit. It is an object.
　この発明に係る蛍光温度センサは、照射された光の強度に応じた蛍光を発する蛍光体と、励起光を蛍光体に投光する投光部と、蛍光体が発する蛍光を受光する受光部と、投光部が発する励起光を導光する励起光送信用光ファイバと、蛍光体が発する蛍光を導光する蛍光送信用光ファイバと、を備え、励起光送信用光ファイバと蛍光送信用光ファイバとは異なる特性を有するものである。 A fluorescence temperature sensor according to the present invention includes a phosphor that emits fluorescence according to the intensity of irradiated light, a light projecting unit that projects excitation light onto the phosphor, and a light receiving unit that receives fluorescence emitted from the phosphor. , An excitation light transmitting optical fiber that guides the excitation light emitted from the light projecting unit, and a fluorescence transmitting optical fiber that guides the fluorescence emitted from the phosphor, and the excitation light transmitting optical fiber and the fluorescence transmitting light. It has different characteristics from the fiber.
　この発明によれば、上記のように構成したので、光ファイバ全体の伝送効率を高めることより、投光部での励起光の発光強度を高めることなく、蛍光を効率よく検出することができる。 According to the present invention, since it is configured as described above, it is possible to efficiently detect fluorescence without increasing the emission intensity of the excitation light in the light projecting unit by increasing the transmission efficiency of the entire optical fiber.
この発明の実施の形態１に係る蛍光温度センサの構造を示す図である。It is a figure which shows the structure of the fluorescence temperature sensor which concerns on Embodiment 1 of this invention. この発明の実施の形態１における励起光送信用光ファイバ及び蛍光送信用光ファイバの光の減衰量を示す図である。It is a figure which shows the attenuation amount of the light of the optical fiber for excitation light in Embodiment 1 of this invention, and the optical fiber for fluorescence transmission. この発明の実施の形態２に係る蛍光温度センサの構造を示す図である。It is a figure which shows the structure of the fluorescence temperature sensor which concerns on Embodiment 2 of this invention. この発明の実施の形態３に係る蛍光温度センサの構造を示す図である。It is a figure which shows the structure of the fluorescence temperature sensor which concerns on Embodiment 3 of this invention. この発明の実施の形態３における励起光送信用光ファイバ、蛍光送信用光ファイバ及びバンドル光ファイバの各バンドル直径条件に対する蛍光強度の比を示す図である。It is a figure which shows ratio of the fluorescence intensity with respect to each bundle diameter condition of the optical fiber for excitation light in Embodiment 3 of this invention, the optical fiber for fluorescence transmission, and a bundle optical fiber.
　以下、この発明の実施の形態について図面を参照しながら詳細に説明する。
（実施の形態１）
　図１に示すように、蛍光温度センサ１は、被測定面に接触させ、温度に応じた蛍光を発光するためのセンサプローブ２と、センサプローブ２に励起光を投光し、センサプローブ２からの蛍光を受光し、その受光量から被測定面の温度測定を行うためのセンサモジュール３と、により構成される。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(Embodiment 1)
As shown in FIG. 1, a fluorescence temperature sensor 1 is brought into contact with a surface to be measured, a sensor probe 2 for emitting fluorescence according to temperature, and excitation light is projected onto the sensor probe 2. And a sensor module 3 for measuring the temperature of the surface to be measured from the amount of the received light.
　センサプローブ２は、図１に示すように、センサモジュール３より投光される励起光により蛍光を発光する蛍光体４と、センサモジュール３により投光される励起光を蛍光体４に導光し、蛍光体４が発する蛍光をセンサモジュール３に導光するための光ファイバ５と、センサプローブ２の先端に設けられ、蛍光体４を覆うカバー６と、光ファイバ５に傷が付かないように保護する保護管７とにより構成される。 As shown in FIG. 1, the sensor probe 2 guides the phosphor 4 that emits fluorescence by the excitation light projected from the sensor module 3 and the excitation light projected by the sensor module 3 to the phosphor 4. The optical fiber 5 for guiding the fluorescence emitted by the phosphor 4 to the sensor module 3, the cover 6 provided at the tip of the sensor probe 2 and covering the phosphor 4, and the optical fiber 5 are not damaged. It is comprised with the protective tube 7 to protect.
　ここで、センサプローブ２とセンサモジュール３に設けられる蛍光体４とを接続する光ファイバ５は、励起光送信用光ファイバ５ａと蛍光送信用光ファイバ５ｂとにより構成される。 Here, the optical fiber 5 that connects the sensor probe 2 and the phosphor 4 provided in the sensor module 3 includes an excitation light transmitting optical fiber 5a and a fluorescence transmitting optical fiber 5b.
　励起光送信用光ファイバ５ａはセンサモジュール３に設けられる投光部９から投光される励起光を蛍光体４に導光するためのものである。この励起光送信用光ファイバ５ａはプラスチック光ファイバにより構成される。 The excitation light transmitting optical fiber 5 a is for guiding the excitation light projected from the light projecting unit 9 provided in the sensor module 3 to the phosphor 4. The pumping light transmitting optical fiber 5a is made of a plastic optical fiber.
　蛍光送信用光ファイバ５ｂは蛍光体４が発する蛍光をセンサモジュール３に設けられる受光部１０に導光するためのものである。この蛍光送信用光ファイバ５ｂは多成分ガラス光ファイバにより構成される。 The fluorescence transmitting optical fiber 5b is for guiding the fluorescence emitted from the phosphor 4 to the light receiving unit 10 provided in the sensor module 3. The fluorescent transmission optical fiber 5b is composed of a multicomponent glass optical fiber.
　センサモジュール３は、図１に示すように、駆動部８により、センサプローブ２に設けられる蛍光体４に励起光を投光するための投光部９と、センサプローブ２に設けられる蛍光体４が発する蛍光を受光するための受光部１０と、受光部１０が受光した受光量に基づいて、被測定面の温度を算出するための処理部１１とにより構成される。 As shown in FIG. 1, the sensor module 3 includes a light projecting unit 9 for projecting excitation light onto the phosphor 4 provided on the sensor probe 2 by the driving unit 8, and a phosphor 4 provided on the sensor probe 2. The light receiving unit 10 for receiving the fluorescence emitted by the light receiving unit 10 and the processing unit 11 for calculating the temperature of the surface to be measured based on the amount of light received by the light receiving unit 10.
　次に、上記のように構成される蛍光温度センサ１の動作について説明する。
　まず、蛍光温度センサ１のセンサプローブ２先端に設けられる蛍光体４が収納されるカバー６表面を被測定面に接触させる。次いで、投光部９から励起光が蛍光体４に投光される。この投光部９から投光された励起光により蛍光体４は蛍光を発光する。受光部１０はこの蛍光体４が発光する蛍光を受光している。このときの受光部１０が受光する受光量は、処理部１１により逐一計測されている。次いで、投光部９は、蛍光体４への励起光の投光を停止する。これにより、蛍光体４は消光する。この蛍光体４の消光速度は温度が高くなるほど速くなる。この蛍光体４の消光速度を処理部１１が計測することにより、被測定面の温度を計測する。 Next, the operation of the fluorescence temperature sensor 1 configured as described above will be described.
First, the surface of the cover 6 in which the phosphor 4 provided at the tip of the sensor probe 2 of the fluorescence temperature sensor 1 is housed is brought into contact with the surface to be measured. Next, excitation light is projected from the light projecting unit 9 onto the phosphor 4. The phosphor 4 emits fluorescence by the excitation light projected from the light projecting unit 9. The light receiving unit 10 receives the fluorescence emitted by the phosphor 4. The amount of light received by the light receiving unit 10 at this time is measured by the processing unit 11 one by one. Next, the light projecting unit 9 stops projecting the excitation light to the phosphor 4. Thereby, the phosphor 4 is quenched. The extinction speed of the phosphor 4 increases as the temperature increases. The processing unit 11 measures the extinction speed of the phosphor 4 to measure the temperature of the surface to be measured.
　次に、励起光送信用光ファイバ５ａと蛍光送信用光ファイバ５ｂに用いられる光ファイバの材質設定方法について説明する。
　図２はこの発明の実施の形態１における励起光送信用光ファイバ５ａ及び蛍光送信用光ファイバ５ｂの光の減衰量を示す図である。
　この図２では、蛍光体４としてルビーを使用し、励起光送信用光ファイバ５ａ及び蛍光送信用光ファイバ５ｂとしてプラスチック光ファイバ（ポリメチルメタクリレート（ＰＭＭＡ））及び多成分ガラス光ファイバを用いた場合での励起光及び蛍光の減衰量を示している。 Next, a material setting method for optical fibers used for the excitation light transmitting optical fiber 5a and the fluorescence transmitting optical fiber 5b will be described.
FIG. 2 is a diagram showing the attenuation of light in the excitation light transmitting optical fiber 5a and the fluorescence transmitting optical fiber 5b in the first embodiment of the present invention.
In FIG. 2, a ruby is used as the phosphor 4, and a plastic optical fiber (polymethyl methacrylate (PMMA)) and a multicomponent glass optical fiber are used as the excitation light transmitting optical fiber 5a and the fluorescence transmitting optical fiber 5b. 2 shows attenuation amounts of excitation light and fluorescence.
　図２に示すように、投光部９が投光する励起光の波長（例えば、５６０ｎｍ～５９０ｎｍ）に対して、蛍光体４の発光する蛍光の波長（例えば、６９０ｎｍ～７００ｎｍ）は長くなる。そのため、励起光を導光する励起光送信用光ファイバ５ａ及び蛍光を導光する蛍光送信用光ファイバ５ｂを同一の光ファイバで構成すると、励起光または蛍光のどちらか一方の伝送効率が悪くなる。そこで、励起光の波長及び蛍光の波長に基づいて、最適な伝送効率を有する材質の光ファイバを用いて励起光送信用光ファイバ５ａ及び蛍光送信用光導波路５ｂを構成することにより、励起光及び蛍光ともに良好な伝送を行うことができる。 As shown in FIG. 2, the wavelength of the fluorescence emitted by the phosphor 4 (for example, 690 nm to 700 nm) is longer than the wavelength of the excitation light projected by the light projecting unit 9 (for example, 560 nm to 590 nm). Therefore, if the excitation light transmitting optical fiber 5a that guides the excitation light and the fluorescence transmission optical fiber 5b that guides the fluorescence are formed of the same optical fiber, the transmission efficiency of either the excitation light or the fluorescence deteriorates. . Therefore, by configuring the excitation light transmission optical fiber 5a and the fluorescence transmission optical waveguide 5b using optical fibers made of materials having optimum transmission efficiency based on the wavelength of the excitation light and the fluorescence wavelength, Both fluorescence and good transmission can be performed.
　図２に示すように、プラスチック光ファイバにより励起光を導光したときの減衰量は、例えば０．０８ｄＢ／ｍであり、多成分ガラス光ファイバにより励起光を導光したときの減衰量は例えば、０．１８ｄＢ／ｍである。したがって、励起光を導光する励起光送信用光ファイバ５ａに対してはプラスチック光ファイバを用いることで伝送効率を良好にすることができる。 As shown in FIG. 2, the attenuation when the excitation light is guided by the plastic optical fiber is, for example, 0.08 dB / m, and the attenuation when the excitation light is guided by the multicomponent glass optical fiber is, for example, 0.18 dB / m. Therefore, it is possible to improve the transmission efficiency by using a plastic optical fiber for the excitation light transmitting optical fiber 5a that guides the excitation light.
　一方、プラスチック光ファイバにより蛍光を導光したときの減衰量は、例えば０．３５ｄＢ／ｍであり、多成分ガラス光ファイバにより蛍光を導光したときの減衰量は、例えば０．２ｄＢ／ｍである。したがって、蛍光を導光する蛍光送信用光ファイバ５ｂに対しては多成分ガラス光ファイバを用いることで伝送効率を良好にすることができる。 On the other hand, the attenuation when the fluorescence is guided by the plastic optical fiber is, for example, 0.35 dB / m, and the attenuation when the fluorescence is guided by the multi-component glass optical fiber is, for example, 0.2 dB / m. is there. Therefore, it is possible to improve the transmission efficiency by using a multi-component glass optical fiber for the fluorescent transmission optical fiber 5b that guides the fluorescence.
　以上のように、この発明の実施の形態１によれば、励起光と蛍光を導光する光ファイバを励起光の波長及び蛍光の波長に応じてそれぞれ設定することにより、励起光及び蛍光に対する伝送効率を高めることができるので、投光部９から投光する励起光の光量を過度に上げる必要はなく、投光部９の光源の負担を抑えることができる。 As described above, according to the first embodiment of the present invention, the optical fiber that guides the excitation light and the fluorescence is set according to the wavelength of the excitation light and the wavelength of the fluorescence, thereby transmitting the excitation light and the fluorescence. Since the efficiency can be increased, it is not necessary to excessively increase the amount of excitation light projected from the light projecting unit 9, and the burden on the light source of the light projecting unit 9 can be suppressed.
　なお、この発明の実施の形態１では、蛍光体４としてルビーを使用し、励起光送信用光ファイバ５ａ及び蛍光送信用光ファイバ５ｂを構成する光ファイバとしてプラスチック光ファイバ及び多成分ガラス光ファイバを用いて説明したが、これに限るものではなく、励起光送信用光ファイバ５ａ及び蛍光送信用光ファイバ５ｂを構成する光ファイバは、励起光の波長及び蛍光の波長に応じて適宜変更されるものである。 In the first embodiment of the present invention, ruby is used as the phosphor 4, and a plastic optical fiber and a multicomponent glass optical fiber are used as optical fibers constituting the excitation light transmitting optical fiber 5a and the fluorescence transmitting optical fiber 5b. Although explained using, it is not restricted to this, The optical fiber which comprises the optical fiber 5a for excitation light transmission, and the optical fiber 5b for fluorescence transmission is suitably changed according to the wavelength of excitation light, and the wavelength of fluorescence It is.
　また、励起光送信用光ファイバ５ａの材質は、蛍光を発光するための投光部９の励起光の波長に対して伝送効率を悪化させない材質であればよく、上記ＰＭＭＡに限定されない。同様に、蛍光送信用光ファイバ５ｂの材質は、蛍光体が発する蛍光の波長に対して伝送効率を悪化させない材質であればよく、上記多成分ガラスに限定されない。例えば、励起光送信用光ファイバ５ａにＰＭＭＡを用いた場合、蛍光送信用光ファイバ５ｂの材質として、多成分ガラスに代えて、溶融石英、希土類ドープ石英、フッ素系樹脂を適用することも可能である。 Further, the material of the excitation light transmitting optical fiber 5a is not limited to the PMMA as long as it does not deteriorate the transmission efficiency with respect to the wavelength of the excitation light of the light projecting unit 9 for emitting fluorescence. Similarly, the material for the optical fiber 5b for fluorescence transmission may be any material that does not deteriorate the transmission efficiency with respect to the wavelength of the fluorescence emitted by the phosphor, and is not limited to the multicomponent glass. For example, when PMMA is used for the excitation light transmitting optical fiber 5a, it is also possible to apply fused silica, rare earth-doped quartz, or fluorine-based resin as the material of the fluorescence transmitting optical fiber 5b in place of the multicomponent glass. is there.
（実施の形態２）
　図３はこの発明の実施の形態２に係る蛍光温度センサ１の構造を示す図である。
　上記実施の形態１に係る蛍光温度センサ１では、励起光送信用光ファイバ５ａと蛍光送信用光ファイバ５ｂを構成する光ファイバとして、それぞれ導光する光の波長に適した材質の光ファイバを用いて構成したが、この発明の実施の形態２に係る蛍光温度センサ１は、励起光送信用光ファイバ５ａと蛍光送信用光ファイバ５ｂに用いられる光ファイバの材質は同一のものを使用し、図３に示すように、励起光送信用光ファイバ５ａのコア面積に対して蛍光送信用光ファイバ５ｂのコア面積が大きくなるように構成したものである。
　以下、図１に示した、この発明の実施の形態１に係る蛍光温度センサ１と同一または同様の構成については、同一の符号を付しその説明を省略する。 (Embodiment 2)
FIG. 3 is a view showing the structure of the fluorescence temperature sensor 1 according to the second embodiment of the present invention.
In the fluorescence temperature sensor 1 according to the first embodiment, optical fibers made of materials suitable for the wavelengths of light to be guided are used as the optical fibers constituting the excitation light transmitting optical fiber 5a and the fluorescence transmitting optical fiber 5b. However, the fluorescence temperature sensor 1 according to the second embodiment of the present invention uses the same optical fiber material used for the excitation light transmitting optical fiber 5a and the fluorescence transmitting optical fiber 5b. 3, the core area of the fluorescence transmission optical fiber 5b is configured to be larger than the core area of the excitation light transmission optical fiber 5a.
Hereinafter, the same or similar components as those in the fluorescence temperature sensor 1 according to Embodiment 1 of the present invention shown in FIG.
　励起光送信用光ファイバ５ａは、例えば、プラスチック光ファイバにより形成され、そのバンドル直径は所定の直径、当該実施の形態では例えば、１ｍｍに構成される。 The pumping light transmitting optical fiber 5a is formed of, for example, a plastic optical fiber, and the bundle diameter is set to a predetermined diameter, for example, 1 mm in the embodiment.
　蛍光送信用光ファイバ５ｂは、励起光送信用光ファイバ５ａと同一材質のプラスチック光ファイバにより形成され、図３に示すように、そのバンドル直径は励起光送信用光ファイバ５ａのバンドル直径よりも太い所定の直径、当該実施の形態では例えば、１．５ｍｍに構成される。 The fluorescent transmission optical fiber 5b is formed of a plastic optical fiber made of the same material as the excitation light transmission optical fiber 5a. As shown in FIG. 3, the bundle diameter is larger than the bundle diameter of the excitation light transmission optical fiber 5a. The predetermined diameter, for example, 1.5 mm in this embodiment is configured.
　蛍光温度センサ１では、投光部９から投光される励起光の光エネルギ以上の蛍光は発生しないため、受光部１０で受光する蛍光の蛍光強度を高めるため、励起光送信用光ファイバ５ａのバンドル直径に対して、蛍光送信用光ファイバ５ｂのバンドル直径を大きくすることで、伝送効率を高めることできる。 In the fluorescence temperature sensor 1, since the fluorescence more than the light energy of the excitation light projected from the light projecting unit 9 is not generated, the fluorescence intensity of the fluorescence received by the light receiving unit 10 is increased. By increasing the bundle diameter of the fluorescent transmission optical fiber 5b with respect to the bundle diameter, the transmission efficiency can be increased.
　以上のように、この発明の実施の形態２によれば、励起光よりも弱い蛍光光量を効率的に伝送するために、蛍光送信用光ファイバ５ｂのコア面積を、励起光送信用光ファイバ５ａのコア面積よりも大きくなるように構成することで、蛍光の伝送効率を高めることができるので、投光部９から投光する励起光の光量を過度に上げる必要はなく、投光部９の光源の負担を抑えることができる。 As described above, according to the second embodiment of the present invention, in order to efficiently transmit the amount of fluorescence light weaker than the excitation light, the core area of the fluorescence transmission optical fiber 5b is changed to the excitation light transmission optical fiber 5a. Since the transmission efficiency of fluorescence can be increased by configuring so as to be larger than the core area, there is no need to excessively increase the amount of excitation light projected from the light projecting unit 9. The burden on the light source can be reduced.
　なお、この発明の上記実施の形態２では、励起光送信用光ファイバ５ａのコア面積（バンドル直径）を１ｍｍ、蛍光送信用光ファイバ５ｂのコア面積（バンドル直径）を１．５ｍｍと例示したが、これに限定されるものではない。蛍光送信用光ファイバ５ｂのコア面積が励起光送信用光ファイバ５ａのコア面積より大きくなるように選択すれば、伝送効率を向上させるという作用効果を奏することが可能である。 In the second embodiment of the present invention, the core area (bundle diameter) of the excitation light transmitting optical fiber 5a is exemplified as 1 mm, and the core area (bundle diameter) of the fluorescence transmitting optical fiber 5b is exemplified as 1.5 mm. However, the present invention is not limited to this. If the core area of the fluorescence transmission optical fiber 5b is selected to be larger than the core area of the excitation light transmission optical fiber 5a, it is possible to achieve the effect of improving the transmission efficiency.
（実施の形態３）
　図４はこの発明の実施の形態３における蛍光温度センサ１の構造を示す図である。
　上記実施の形態１，２に係る蛍光温度センサ１では、センサプローブ２とセンサモジュール３とを励起光送信用光ファイバ５ａ及び蛍光送信用光ファイバ５ｂにより接続して構成したが、この発明の実施の形態３に係る蛍光温度センサ１では、例えば、狭い領域に光ファイバ５を敷設するような場合に、バンドル光ファイバ５ｃを用いてコア面積の異なる励起光送信用光ファイバ５ａ及び蛍光送信用光ファイバ５ｂと接続するように構成したものである。
　以下、図１，３に示した、この発明の実施の形態１に係る蛍光温度センサ１と同一または同様の構成については、同一の符号を付しその説明を省略する。 (Embodiment 3)
FIG. 4 is a diagram showing the structure of the fluorescence temperature sensor 1 according to Embodiment 3 of the present invention.
In the fluorescence temperature sensor 1 according to the first and second embodiments, the sensor probe 2 and the sensor module 3 are connected by the excitation light transmitting optical fiber 5a and the fluorescence transmitting optical fiber 5b. In the fluorescence temperature sensor 1 according to the third embodiment, for example, when the optical fiber 5 is laid in a narrow region, the excitation light transmitting optical fiber 5a and the fluorescence transmitting light having different core areas using the bundle optical fiber 5c are used. It is configured to be connected to the fiber 5b.
Hereinafter, the same or similar components as those of the fluorescent temperature sensor 1 according to Embodiment 1 of the present invention shown in FIGS.
　励起光送信用光ファイバ５ａは、例えば、プラスチック光ファイバにより構成され、図４に示すように、励起光送信用光ファイバ５ａの蛍光体４側先端はバンドル光ファイバ５ｃの励起光送信用光ファイバ５ａ側と光軸を合わせてＦＣコネクタ等により接続されている。また、この励起光送信用光ファイバ５ａのコア形状は円形である。 The pumping light transmitting optical fiber 5a is made of, for example, a plastic optical fiber. As shown in FIG. 4, the fluorescent light 4 side tip of the pumping light transmitting optical fiber 5a is the pumping light transmitting optical fiber of the bundle optical fiber 5c. The optical axis is aligned with the 5a side and connected by an FC connector or the like. The core shape of the excitation light transmitting optical fiber 5a is circular.
　蛍光送信用光ファイバ５ｂは、例えば、プラスチック光ファイバにより構成され、図４に示すように、蛍光送信用光ファイバ５ｂの蛍光体４側先端はバンドル光ファイバ５ｃの蛍光送信用光ファイバ５ｂ側と光軸を合わせてＦＣコネクタ等により接続されている。また、この励起光送信用光ファイバ５ａのコア形状は円形である。 The fluorescent transmission optical fiber 5b is made of, for example, a plastic optical fiber. As shown in FIG. 4, the fluorescent transmission optical fiber 5b has a fluorescent material 4 side tip at the fluorescence transmission optical fiber 5b side of the bundle optical fiber 5c. The optical axes are aligned and connected by an FC connector or the like. Further, the core shape of the excitation light transmitting optical fiber 5a is circular.
　バンドル光ファイバ５ｃは、励起光送信用光ファイバ５ａにより導光される励起光を蛍光体４に導光し、蛍光体４が発する蛍光を蛍光送信用光ファイバ５ｂに導光するためのものである。また、バンドル光ファイバ５ｃの励起光送信用光ファイバ５ａ側のコア形状及び蛍光送信用光ファイバ５ｂ側のコア形状は円形である。 The bundle optical fiber 5c guides the excitation light guided by the excitation light transmitting optical fiber 5a to the phosphor 4, and guides the fluorescence emitted from the phosphor 4 to the fluorescence transmitting optical fiber 5b. is there. Further, the core shape of the bundle optical fiber 5c on the excitation light transmitting optical fiber 5a side and the core shape on the fluorescence transmitting optical fiber 5b side are circular.
　ここで、励起光送信用光ファイバ５ａのコア面積ＳＩＦ、蛍光送信用光ファイバ５ｂのコア面積ＳＯＦ、バンドル光ファイバ５ｃの励起光送信用光ファイバ５ａ側のコア面積ＳＳＦＩ及び蛍光送信用光ファイバ５ｂ側のコア面積ＳＳＦＯは、ＳＩＦ＜ＳＳＦＩ≦ＳＳＦＯ＜ＳＯＦを満たすように構成され接続される。 Here, the core area S IF of the excitation light transmitting optical fiber 5a, the core area S OF of the fluorescence transmitting optical fiber 5b, the core area S SFI on the excitation light transmitting optical fiber 5a side of the bundle optical fiber 5c, and the fluorescence transmitting The core area S SFO on the optical fiber 5b side is configured and connected so as to satisfy S IF <S SFI ≦ S SFO <S OF .
　図５はこの発明の実施の形態３における励起光送信用光ファイバ５ａ、蛍光送信用光ファイバ５ｂ及びバンドル光ファイバ５ｃの各バンドル直径条件（ａ）～（ｄ）に対する蛍光強度の比を、（ａ）の各バンドル直径条件のときの蛍光強度を基準にして示した図である。図５に示す光ファイバの直径は例示であり、これ以外の値を採ることも可能である。ここで、励起光送信用光ファイバ５ａ、蛍光送信用光ファイバ５ｂ及びバンドル光ファイバ５ｃのコア形状は円形である。また、バンドル光ファイバ５ｃの励起光送信用光ファイバ５ａ側のバンドル直径及び蛍光送信用光ファイバ５ｂ側のバンドル直径は共に１．２ｍｍである。また、励起光を投光する投光部９としてＬＥＤを用い、受光部１０としてフォトダイオードを用いている。 FIG. 5 shows the ratio of the fluorescence intensity to the bundle diameter conditions (a) to (d) of the excitation light transmitting optical fiber 5a, the fluorescence transmitting optical fiber 5b, and the bundle optical fiber 5c according to the third embodiment of the present invention. It is the figure shown on the basis of the fluorescence intensity at the time of each bundle diameter condition of a). The diameter of the optical fiber shown in FIG. 5 is an exemplification, and other values can be taken. Here, the core shapes of the excitation light transmitting optical fiber 5a, the fluorescence transmitting optical fiber 5b, and the bundle optical fiber 5c are circular. The bundle diameter of the bundle optical fiber 5c on the excitation light transmitting optical fiber 5a side and the bundle diameter on the fluorescence transmitting optical fiber 5b side are both 1.2 mm. Further, an LED is used as the light projecting unit 9 that projects the excitation light, and a photodiode is used as the light receiving unit 10.
　図５（ａ）に示すように、励起光送信用光ファイバ５ａのバンドル直径が１ｍｍ、かつ、蛍光送信用光ファイバ５ｂのバンドル直径が１ｍｍの場合では、蛍光送信用光ファイバ５ｂ側のバンドル光ファイバ５ｃのバンドル直径に対して、蛍光送信用光ファイバ５ｂのバンドル直径が小さいため、蛍光送信用光ファイバ５ｂとバンドル光ファイバ５ｃとの接続口で蛍光が漏洩してしまい、蛍光強度が低下する。 As shown in FIG. 5A, when the bundle diameter of the excitation light transmission optical fiber 5a is 1 mm and the bundle diameter of the fluorescence transmission optical fiber 5b is 1 mm, the bundle light on the fluorescence transmission optical fiber 5b side is shown. Since the bundle diameter of the fluorescence transmission optical fiber 5b is smaller than the bundle diameter of the fiber 5c, the fluorescence leaks at the connection port between the fluorescence transmission optical fiber 5b and the bundle optical fiber 5c, and the fluorescence intensity decreases. .
　また、図５（ｃ）に示すように、励起光送信用光ファイバ５ａのバンドル直径が１．５ｍｍ、かつ、蛍光送信用光ファイバ５ｂのバンドル直径が１ｍｍの場合では、励起光送信用光ファイバ５ａ側のバンドル光ファイバ５ｃのバンドル直径に対して、励起光送信用光ファイバ５ａのバンドル直径が大きいため、励起光送信用光ファイバ５ａとバンドル光ファイバ５ｃとの接続口で励起光が漏洩してしまい、励起光強度が低下する。さらに、蛍光送信用光ファイバ５ｂ側のバンドル光ファイバ５ｃのバンドル直径に対して、蛍光送信用光ファイバ５ｂのバンドル直径が小さいため、蛍光送信用光ファイバ５ｂとバンドル光ファイバ５ｃとの接続口で蛍光が漏洩してしまい、蛍光強度が低下する。 As shown in FIG. 5C, when the bundle diameter of the excitation light transmitting optical fiber 5a is 1.5 mm and the bundle diameter of the fluorescence transmitting optical fiber 5b is 1 mm, the excitation light transmitting optical fiber is used. Since the bundle diameter of the excitation light transmitting optical fiber 5a is larger than the bundle diameter of the bundle optical fiber 5c on the 5a side, the excitation light leaks at the connection port between the excitation light transmitting optical fiber 5a and the bundle optical fiber 5c. As a result, the excitation light intensity decreases. Further, since the bundle diameter of the fluorescent transmission optical fiber 5b is smaller than the bundle diameter of the bundle optical fiber 5c on the fluorescent transmission optical fiber 5b side, the connection port between the fluorescent transmission optical fiber 5b and the bundle optical fiber 5c is used. The fluorescence leaks and the fluorescence intensity decreases.
　また、図５（ｄ）に示すように、励起光送信用光ファイバ５ａのバンドル直径が１．５ｍｍ、かつ、蛍光送信用光ファイバ５ｂのバンドル直径が１．５ｍｍの場合では、励起光送信用光ファイバ５ａ側のバンドル光ファイバ５ｃのバンドル直径に対して、励起光送信用光ファイバ５ａのバンドル直径が大きいため、励起光送信用光ファイバ５ａとバンドル光ファイバ５ｃとの接続口で励起光が漏洩してしまい、励起光強度が低下する。 Further, as shown in FIG. 5D, when the bundle diameter of the excitation light transmitting optical fiber 5a is 1.5 mm and the bundle diameter of the fluorescence transmitting optical fiber 5b is 1.5 mm, Since the bundle diameter of the excitation light transmitting optical fiber 5a is larger than the bundle diameter of the bundle optical fiber 5c on the optical fiber 5a side, the excitation light is transmitted at the connection port between the excitation light transmitting optical fiber 5a and the bundle optical fiber 5c. Leakage occurs and the excitation light intensity decreases.
　一方、図５（ｂ）に示すように、励起光送信用光ファイバ５ａのバンドル直径を１ｍｍとして、蛍光送信用光ファイバ５ｂのバンドル直径を１．５ｍｍとした場合、すなわち、励起光送信用光ファイバ５ａのバンドル直径、バンドル光ファイバ５ｃのバンドル直径、蛍光送信用光ファイバ５ｂのバンドル直径の順にバンドル直径を大きくした場合には、各接続間での励起光及び蛍光の損失がなく最も効率よく蛍光を受光部１０に導光することができる。 On the other hand, as shown in FIG. 5B, when the bundle diameter of the excitation light transmitting optical fiber 5a is 1 mm and the bundle diameter of the fluorescence transmitting optical fiber 5b is 1.5 mm, that is, the excitation light transmitting light. When the bundle diameter is increased in the order of the bundle diameter of the fiber 5a, the bundle diameter of the bundle optical fiber 5c, and the bundle diameter of the fluorescent transmission optical fiber 5b, there is no loss of excitation light and fluorescence between the connections, and it is most efficient. The fluorescence can be guided to the light receiving unit 10.
　以上のように、この発明の実施の形態３によれば、励起光送信用光ファイバ５ａ及び蛍光送信用光ファイバ５ｂと、バンドル光ファイバ５ｃとの接続において、励起光送信用光ファイバ５ａのコア面積、バンドル光ファイバ５ｃの励起光送信用光ファイバ５ａ側のコア面積、バンドル光ファイバ５ｃの蛍光送信用光ファイバ５ｂ側のコア面積、蛍光送信用光ファイバ５ｂのコア面積の順にコア面積を大きくし、励起光及び蛍光の送信側の光ファイバのコアを受信側の光ファイバのコアで覆うように接続することで、励起光送信用光ファイバ５ａ及び蛍光送信用光ファイバ５ｂとバンドル光ファイバ５ｃとの接続間での励起光及び蛍光の漏れを防ぐことができ、励起光及び蛍光の伝送効率を高めることができるため、投光部９から投光する励起光の光量を過度に上げる必要はなく、投光部９の光源の負担を抑えることができる。 As described above, according to the third embodiment of the present invention, the core of the pumping light transmitting optical fiber 5a is connected in the connection between the pumping light transmitting optical fiber 5a and the fluorescence transmitting optical fiber 5b and the bundle optical fiber 5c. The core area increases in the order of the area, the core area of the bundle optical fiber 5c on the excitation light transmitting optical fiber 5a side, the core area of the bundle optical fiber 5c on the fluorescent transmitting optical fiber 5b side, and the core area of the fluorescent transmitting optical fiber 5b. Then, by connecting the core of the optical fiber on the transmission side of the excitation light and the fluorescence so as to be covered with the core of the optical fiber on the reception side, the optical fiber 5a for excitation light transmission, the optical fiber 5b for fluorescence transmission, and the bundle optical fiber 5c Excitation light and fluorescence leakage between the connections can be prevented, and the transmission efficiency of excitation light and fluorescence can be increased. It is not necessary to increase the amount of light excessively, it is possible to suppress the burden of the light source of the light projecting unit 9.
　なお、この発明の実施の形態３に係る蛍光温度センサ１では、励起光送信用光ファイバ５ａ、蛍光送信用光ファイバ５ｂ及びバンドル光ファイバ５ｃのコア形状は円形状として説明したが、これに限るものではなく、矩形のコアを有する光ファイバを用いて構成してもよい。 In the fluorescence temperature sensor 1 according to Embodiment 3 of the present invention, the excitation light transmitting optical fiber 5a, the fluorescence transmitting optical fiber 5b, and the bundle optical fiber 5c have been described as having a circular core shape, but the present invention is not limited thereto. Instead of this, an optical fiber having a rectangular core may be used.
　また、この発明の実施の形態３に係る蛍光温度センサ１では、励起光送信用光ファイバ５ａ及び蛍光送信用光ファイバ５ｂとを同一の材質の光ファイバを用いて説明したが、これに限るものではなく、励起光送信用光ファイバ５ａと蛍光送信用光同波路５ｂとを別の材質の光ファイバにより構成してもよい。 In the fluorescence temperature sensor 1 according to the third embodiment of the present invention, the excitation light transmitting optical fiber 5a and the fluorescence transmitting optical fiber 5b are described using optical fibers made of the same material. However, the present invention is not limited to this. Instead, the excitation light transmitting optical fiber 5a and the fluorescence transmitting optical waveguide 5b may be formed of optical fibers made of different materials.
　また、この発明の上記実施の形態３では、励起光送信用光ファイバ５ａのコア面積（バンドル直径）を１ｍｍ、バンドル光ファイバ５ｃのコア面積（バンドル直径）を１．２ｍｍ、蛍光送信用光ファイバ５ｂのコア面積（バンドル直径）を１．５ｍｍとしたが、これら例示した面積に限定されない。例えば、励起光送信用光ファイバ５ａのコア面積：バンドル光ファイバ５ｃのコア面積：蛍光送信用光ファイバ５ｂのバンドル直径を、０．５ｍｍ：１．０ｍｍ：１．５ｍｍとしたり、１．５ｍｍ：１．８ｍｍ：２．０ｍｍとしたりしても伝送効率を向上させることができる。すなわち、励起光送信用光ファイバ５ａのコア面積Ａ：バンドル光ファイバ５ｃのコア面積Ｃ：蛍光送信用光ファイバ５ｂのコア面積Ｂの関係が、Ａ＜Ｃ＜Ｂとなるように設定されていればよい。 In Embodiment 3 of the present invention, the core area (bundle diameter) of the excitation light transmitting optical fiber 5a is 1 mm, the core area (bundle diameter) of the bundle optical fiber 5c is 1.2 mm, and the fluorescent transmitting optical fiber. Although the core area (bundle diameter) of 5b is 1.5 mm, it is not limited to these exemplified areas. For example, the core area of the excitation light transmitting optical fiber 5a: the core area of the bundle optical fiber 5c: the bundle diameter of the fluorescent transmitting optical fiber 5b is set to 0.5 mm: 1.0 mm: 1.5 mm, or 1.5 mm: Even if it is set to 1.8 mm: 2.0 mm, the transmission efficiency can be improved. That is, the relationship of the core area A of the excitation light transmitting optical fiber 5a: the core area C of the bundle optical fiber 5c: the core area B of the fluorescent transmitting optical fiber 5b is set so that A <C <B. That's fine.
　また、上述の実施の形態では励起光送信用光ファイバ５ａ及び蛍光送信用光ファイバ５ｂをバンドルの光ファイバにより構成して説明したが、これに限るものではなく、励起光送信用光ファイバ５ａ及び蛍光送信用光ファイバ５ｂを単芯の光ファイバにより構成しても構わず、また、例えば励起光送信用光ファイバ５ａを単芯の光ファイバにより構成し、蛍光送信用光ファイバ５ｂをバンドルの光ファイバにより構成するなど、組み合わせて構成しても構わない。 In the above-described embodiment, the pumping light transmitting optical fiber 5a and the fluorescence transmitting optical fiber 5b are described as bundled optical fibers. However, the present invention is not limited to this, and the pumping light transmitting optical fiber 5a and The fluorescence transmission optical fiber 5b may be formed of a single-core optical fiber. For example, the excitation light transmission optical fiber 5a is formed of a single-core optical fiber, and the fluorescence transmission optical fiber 5b is a bundle of light. You may comprise combining, such as comprising with a fiber.
１…蛍光温度センサ、２…センサプローブ、３…センサモジュール、４…蛍光体、５…光ファイバ、５ａ…励起光送信用光ファイバ、５ｂ…蛍光送信用光ファイバ、５ｃ…バンドル光ファイバ、６…カバー、７…保護管、８…駆動部、９…投光部、１０…受光部、１１…処理部 DESCRIPTION OF SYMBOLS 1 ... Fluorescence temperature sensor, 2 ... Sensor probe, 3 ... Sensor module, 4 ... Phosphor, 5 ... Optical fiber, 5a ... Excitation light transmission optical fiber, 5b ... Fluorescence transmission optical fiber, 5c ... Bundle optical fiber, 6 ... Cover, 7 ... Protective tube, 8 ... Drive part, 9 ... Light projecting part, 10 ... Light receiving part, 11 ... Processing part

Claims (4)

  1. 　照射された光の強度に応じた蛍光を発する蛍光体と、
    　励起光を前記蛍光体に投光する投光部と、
    　前記蛍光体が発する蛍光を受光する受光部と、
    　前記投光部が発する励起光を導光する励起光送信用光ファイバと、
    　前記蛍光体が発する蛍光を導光する蛍光送信用光ファイバと、を備え、
    　前記励起光送信用光ファイバと前記蛍光送信用光ファイバとは異なる特性を有する、
    蛍光温度センサ。     A phosphor that emits fluorescence according to the intensity of the irradiated light;
    A light projecting unit that projects excitation light onto the phosphor;
    A light receiving portion for receiving fluorescence emitted by the phosphor;
    An excitation light transmitting optical fiber for guiding the excitation light emitted by the light projecting unit;
    An optical fiber for fluorescence transmission that guides the fluorescence emitted by the phosphor, and
    The excitation light transmitting optical fiber and the fluorescence transmitting optical fiber have different characteristics.
    Fluorescent temperature sensor.
  2. 　前記励起光送信用光ファイバは前記投光部が発する励起光の波長に基づいて前記励起光送信用光ファイバの材質を決定し、
    　前記蛍光送信用光ファイバは前記蛍光体が発する蛍光の波長に基づいて前記蛍光送信用光ファイバの材質を決定する、
    請求項１記載の蛍光温度センサ。     The pumping light transmitting optical fiber determines the material of the pumping light transmitting optical fiber based on the wavelength of the pumping light emitted by the light projecting unit,
    The fluorescent transmission optical fiber determines the material of the fluorescent transmission optical fiber based on the wavelength of fluorescence emitted by the phosphor.
    The fluorescence temperature sensor according to claim 1.
  3. 　前記蛍光送信用光ファイバのコア面積は、前記励起光送信用光ファイバのコア面積よりも大きく構成される、
    請求項１記載の蛍光温度センサ。     The core area of the optical fiber for fluorescence transmission is configured to be larger than the core area of the optical fiber for excitation light transmission,
    The fluorescence temperature sensor according to claim 1.
  4. 　前記励起光送信用光ファイバ及び前記蛍光送信用光ファイバと接続し、前記励起光送信用光ファイバからの励起光を前記蛍光体に導光し、前記蛍光体の発する蛍光を前記蛍光送信用光ファイバに導光するためのバンドル光ファイバを備え、
    　前記励起光送信用光ファイバのコア面積、前記バンドル光ファイバの前記蛍光送信用光ファイバ側のコア面積、前記バンドル光ファイバの前記蛍光送信用光ファイバ側のコア面積、前記蛍光送信用光ファイバのコア面積の順にコア面積を大きくなるように構成した、
    請求項１記載の蛍光温度センサ。     The excitation light transmission optical fiber and the fluorescence transmission optical fiber are connected, the excitation light from the excitation light transmission optical fiber is guided to the phosphor, and the fluorescence emitted from the phosphor is converted into the fluorescence transmission light. A bundle optical fiber for guiding the fiber,
    The core area of the optical fiber for excitation light transmission, the core area of the bundle optical fiber on the side of the optical fiber for fluorescent transmission, the core area of the optical fiber for optical transmission of the bundle optical fiber, the optical fiber for optical transmission of fluorescence Configured to increase the core area in the order of the core area,
    The fluorescence temperature sensor according to claim 1.
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