Temperature measurement system and method of manufacturing thereof

Abstract

To obtain a temperature measuring system capable of inhibiting the transmission of strain generated in a temperature measuring object to an optical fiber and improving the responsiveness of heat transmission from the temperature measuring object to the optical fiber. The temperature measuring system includes a temperature measuring object, an optical fiber provided to the temperature measuring object, an intermediate material provided to the optical fiber, and a pressing jig provided to the temperature measuring object and pressing the optical fiber to the temperature measuring object via the intermediate material, and the optical fiber is capable of stretching and contracting in the length direction of the optical fiber based on the temperature change of the optical fiber with respect to the temperature measuring object and the intermediate material.

Description

Technical Field

[0001] This invention relates to a temperature measuring system having an optical fiber disposed on the object of temperature measurement and a method for manufacturing the same. Background Technology

[0002] Conventional temperature measuring systems are known to include a temperature measuring object, an optical fiber, a housing tube for housing the optical fiber, and a conductive adhesive filling the housing tube, with the housing tube fixed to the temperature measuring object. The optical fiber is supported in the housing tube via the conductive adhesive. Thus, when strain caused by temperature change occurs in the temperature measuring object, the transmission of the strain generated in the temperature measuring object to the optical fiber can be suppressed (see, for example, Patent Document 1).

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2004-101471 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] However, the optical fiber is supported by a conductive adhesive within the housing tube. This allows the optical fiber to move within the housing tube in directions that change the distance between the optical fiber and the temperature measuring object. Therefore, for example, when the housing tube is fixed to the lower surface of the temperature measuring object, the optical fiber separates more significantly from the temperature measuring object due to gravity compared to when the housing tube is fixed to the upper surface. In this case, there is a problem of deteriorated responsiveness in heat transfer from the temperature measuring object to the optical fiber.

[0008] The present invention was made to solve the aforementioned problems, and its object is to provide a temperature measuring system and a method thereof capable of suppressing the transmission of strain generated in the temperature measuring object to the optical fiber and improving the responsiveness of heat transfer from the temperature measuring object to the optical fiber.

[0009] Solution for solving the problem

[0010] The temperature measurement system of the present invention includes a temperature measurement object, an optical fiber disposed on the temperature measurement object, an intermediate material disposed on the optical fiber, and a pressing clamp disposed on the temperature measurement object and pressing the optical fiber onto the temperature measurement object via the intermediate material. The optical fiber can extend and retract along its length direction relative to the temperature measurement object and the intermediate material.

[0011] The manufacturing method of the temperature measuring system of the present invention includes: a temporary fixing step, in which an optical fiber is temporarily fixed relative to a temperature measuring object using a temporary fixing member; a holding step, after the temporary fixing step, in which a pressing clamp is installed on the temperature measuring object, whereby the pressing clamp presses the optical fiber onto the temperature measuring object via an intermediate material; and a temporary fixing release step, after the holding step, in which the temporary fixing of the optical fiber relative to the temperature measuring object based on the temporary fixing member is released, wherein in the holding step, the optical fiber is able to stretch or contract in the length direction of the optical fiber relative to the temperature measuring object and the intermediate material based on temperature changes in the optical fiber.

[0012] Invention Effects

[0013] The temperature measuring system and manufacturing method of the present invention can suppress the transmission of strain generated in the temperature measuring object to the optical fiber and improve the responsiveness of heat transfer from the temperature measuring object to the optical fiber. Attached Figure Description

[0014] Figure 1 This is a diagram showing the structure of an optical fiber.

[0015] Figure 2 It means Figure 1 The structural diagram of the FBG sensor section.

[0016] Figure 3 It means in Figure 2 The coordinate graph of the characteristics of the reflection spectrum obtained from the FBG sensor section.

[0017] Figure 4 It means possessing Figure 1 The structural diagram of the optical fiber temperature measurement system.

[0018] Figure 5 This is a three-dimensional diagram representing a conventional temperature measurement system.

[0019] Figure 6 This is an explanation Figure 5 A graph showing the response of heat transfer in a temperature measurement system.

[0020] Figure 7 It means to decrease. Figure 5 The diagram shows the protective tube and optical fiber when the radial dimensions of the protective tube prevent the optical fiber from moving radially relative to the protective tube.

[0021] Figure 8 This is a three-dimensional diagram representing another conventional temperature measurement system.

[0022] Figure 9 This is a perspective view of the temperature measuring system according to Embodiment 1 of the present invention.

[0023] Figure 10It means Figure 9 A three-dimensional view of a modified temperature measurement system.

[0024] Figure 11 This is a flowchart illustrating the manufacturing method of the temperature measuring system according to Embodiment 1 of the present invention.

[0025] Figure 12 This is an explanation Figure 11 A diagram of a temporary fixed process.

[0026] Figure 13 This is an explanation Figure 11 The diagram shows the holding process.

[0027] Figure 14 This is a perspective view of the temperature measuring system according to Embodiment 2 of the present invention.

[0028] Figure 15 It means Figure 14 A three-dimensional view of a modified temperature measurement system.

[0029] Figure 16 This is a perspective view of the temperature measuring system according to Embodiment 3 of the present invention.

[0030] Figure 17 It means Figure 16 A three-dimensional view of a modified temperature measurement system.

[0031] Figure 18 This is a perspective view of the temperature measuring system according to Embodiment 4 of the present invention.

[0032] Figure 19 It means Figure 18 A three-dimensional view of a modified temperature measurement system. Detailed Implementation

[0033] Implementation method 1.

[0034] First, the optical fiber, which is one of the structural elements in the temperature measurement system of Embodiment 1, will be explained. Figure 1 This is a structural diagram representing an optical fiber. Optical fiber 1 includes multi-point type optical fiber 1 and distributed type optical fiber 1. In multi-point type optical fiber 1, temperature is measured at multiple designated points within a single optical fiber 1. In distributed type optical fiber 1, temperature is measured continuously within a single optical fiber 1. Broadband frequency light or scattered light is used in temperature measurement using optical fiber 1. Examples of scattered light include Rayleigh scattering, Brillouin scattering, and Raman scattering.

[0035] In Embodiment 1, it is described that FBG (Fiber Bragg Gratings) is used as the optical fiber 1 of the sensor section.

[0036] The optical fiber 1 includes a core 101, an FBG sensor section 102 disposed on the core 101, a cladding 103 covering the outer periphery of the core 101, and a covering portion 104 covering the outer periphery of the cladding 103. The FBG sensor section 102 is used to measure temperature using the relationship between Bragg wavelength and temperature. The FBG sensor section 102 is disposed inside the core 101. Examples of materials constituting the covering portion 104 include acrylic resin and polyimide resin.

[0037] A cladding removal portion 105 is formed in the cladding portion 104 to expose the outer periphery of the cladding 103. The cladding removal portion 105 is formed in the region of the cladding portion 104 that corresponds to the FBG sensor portion 102 in the radial direction of the optical fiber 1. Therefore, the radial dimension of the portion of the optical fiber 1 in which the FBG sensor portion 102 is disposed is reduced compared to other portions of the optical fiber 1.

[0038] The radial dimension of the portion of optical fiber 1 having the cladding portion 104 is 250 μm. The radial dimension of the cladding 103 is 125 μm. The radial dimension of the core 101 is 10 μm. The FBG sensor portion 102 is arranged across the core 101 for approximately 5 mm along the length of optical fiber 1.

[0039] The FBG sensor section 102 has a structure in which a periodic refractive index modulation section is formed in the core 101. In the FBG sensor section 102, a steep reflection spectral characteristic can be obtained. Figure 2 It means Figure 1 The diagram shows the structure of the FBG sensor section 102. In the FBG sensor section 102, the refractive index of the core 101 varies periodically with a periodic Λ.

[0040] Figure 3 It means in Figure 2 A coordinate graph showing the characteristics of the reflection spectrum obtained by the FBG sensor unit 102. The FBG sensor unit 102 obtains a steep reflection spectrum. The light intensity is maximum at the center wavelength of the obtained reflection spectrum. Let the center wavelength of the reflection spectrum be the Bragg wavelength λ. b .

[0041] Bragg wavelength λ b The relationship between period Λ and refractive index n is expressed by the following equation (1).

[0042] λ b =2nΛ (1)

[0043] The refractive index n varies with the temperature of fiber 1. The period Λ varies with the temperature of fiber 1 and the strain transmitted from the temperature measuring object to fiber 1. Therefore, the Bragg wavelength λ is pre-determined when the strain of the temperature measuring object is not transmitted to fiber 1. b The relationship with temperature, the relationship measured using the Bragg wavelength λb To measure the temperature of the object being measured.

[0044] Next, the temperature measurement system will be described. Figure 4 It means possessing Figure 1 The diagram shows the structure of the temperature measurement system based on optical fiber 1. The temperature measurement system includes optical fiber 1, optical circulator 2, ASE (Amplified Spontaneous Emission) light source 3, and spectrometer 4.

[0045] An optical circulator 2 is connected to the end of the optical fiber 1 along its length. The optical circulator 2 converts the optical path passing through it.

[0046] ASE light source 3 emits light with a relatively wide frequency band. ASE light source 3 is connected to optical circulator 2. The light emitted from ASE light source 3 is input to optical circulator 2.

[0047] The spectrum analyzer 4 is a wavelength measuring device. The spectrum analyzer 4 is connected to the optical circulator 2. Light is input to the spectrum analyzer 4 via the optical circulator 2.

[0048] The temperature measurement system measures the Bragg wavelength λ using a spectral analyzer 4. b To measure the temperature of the object being measured.

[0049] Next, we will explain the issues in previous temperature measurement systems. Figure 5 This is a three-dimensional diagram representing a conventional temperature measurement system. A conventional temperature measurement system includes a temperature measurement object (5), an optical fiber (1), a protective tube (6), and a conductive adhesive (7).

[0050] The optical fiber 1 is housed in a protective tube 6. A conductive adhesive 7 is filled inside the protective tube 6. Thus, the conductive adhesive 7 is arranged around the optical fiber 1. The protective tube 6 is fixed to the temperature measuring object 5.

[0051] Figure 6 This is an explanation Figure 5 A graph showing the response of heat transfer in a temperature measurement system. Figure 6 The diagram shows the protective tube 6 fixed to the upper surface of the temperature measuring object 5 and the protective tube 6 fixed to the lower surface of the temperature measuring object 5.

[0052] Compared to the case where the protective tube 6 is fixed to the upper surface of the temperature measuring object 5, when it is fixed to the lower surface of the temperature measuring object 5, the optical fiber 1 separates more significantly from the temperature measuring object 5 due to gravity acting on the optical fiber 1. As a result, the responsiveness of heat transfer from the temperature measuring object 5 to the optical fiber 1 deteriorates when the protective tube 6 is fixed to the lower surface of the temperature measuring object 5, compared to the case where the protective tube 6 is fixed to the upper surface. In other words, the responsiveness of heat transfer in the temperature measuring system deteriorates.

[0053] To suppress the deterioration of the responsiveness of heat transfer in the temperature measurement system, it is advisable to reduce the radial dimension of the protective tube 6 to prevent the optical fiber 1 from moving radially relative to the protective tube 6. Figure 7 It means to decrease. Figure 5 The diagram shows the protective tube 6 and the optical fiber 1 when the radial dimension of the protective tube 6 prevents the optical fiber 1 from moving radially relative to the protective tube 6. When the optical fiber 1 does not move radially relative to the protective tube 6, the optical fiber 1 is confined at the bend of the protective tube 6. As a result, strain is transmitted from the temperature measuring object 5 to the FBG sensor section 102. Consequently, the temperature measuring accuracy of the temperature measuring system deteriorates.

[0054] Figure 8 This is a perspective view of another conventional temperature measurement system. This conventional temperature measurement system includes a temperature measuring object 5, an optical fiber 1, a frame 8, and a conductive adhesive.

[0055] The optical fiber 1 is housed within a frame 8. A conductive adhesive is filled within the frame 8. Thus, a conductive adhesive is positioned around the optical fiber 1. The frame 8 is fixed to the temperature measuring object 5.

[0056] The optical fiber 1 is arranged in an Ω shape inside the frame 8. An inlet 81 and an outlet 82 are formed in the frame 8 for inserting the optical fiber 1. The optical fiber 1 is fixed to the frame 8 at the inlet 81 and outlet 82. Inside the frame 8, the optical fiber 1 is not fixed to the frame 8. Therefore, strain from the temperature measuring object 5 is not transmitted to the optical fiber 1.

[0057] However, because the optical fiber 1 is bent into an Ω shape, the portion of the temperature measuring object 5 is restricted. In other words, the space in the temperature measuring object 5 where the optical fiber 1 is not located increases. As a result, the density of the portion of the temperature measuring system based on temperature measurement decreases.

[0058] It should be noted that in previous temperature measurement systems, the relationship between Brillouin scattered light and temperature was pre-determined, and the temperature of the measurement object 5 was measured from the new Brillouin scattered light using the determined relationship.

[0059] Based on the above considerations, the inventors of this application focus on the following issue: In conventional temperature measurement systems, it is impossible to measure temperature with high accuracy and high density without deteriorating the responsiveness of heat transfer.

[0060] In Embodiment 1, in order to solve the novel problem described above, a temperature measuring system and its manufacturing method are provided that allow for the free placement of the optical fiber 1 without deteriorating the responsiveness of heat transfer, and are capable of measuring temperature with high accuracy and high density.

[0061] Next, the temperature measurement system of Embodiment 1 will be described. Figure 9 This is a perspective view showing the temperature measuring system according to Embodiment 1 of the present invention. Figure 9 The image shows a temperature measuring system with optical fiber 1 positioned in a straight line. The temperature measuring system includes optical fiber 1, temperature measuring object 5, intermediate material 9, and pressing clamp 10.

[0062] Fiber optic cable 1 is positioned on the object 5 being measured for temperature. Figure 9 In this configuration, optical fiber 1 is disposed on the upper surface of the temperature measuring object 5, but it can also be disposed on the lower surface of the temperature measuring object 5. Optical fiber 1 has sensitivity to both temperature and strain.

[0063] Intermediate material 9 is placed on the temperature measuring object 5. Intermediate material 9 is in contact with optical fiber 1. Intermediate material 9 restricts the movement of optical fiber 1 in the direction in which optical fiber 1 separates from temperature measuring object 5.

[0064] The pressing clamp 10 is disposed on the temperature measuring object 5. The pressing clamp 10 is fixed to the temperature measuring object 5. The pressing clamp 10 holds the optical fiber 1 via the intermediate material 9. In other words, the pressing clamp 10 holds the optical fiber 1 and the intermediate material 9 to prevent the optical fiber 1 and the intermediate material 9 from separating from the temperature measuring object 5. Moreover, the pressing clamp 10 presses the optical fiber 1 against the temperature measuring object 5 via the intermediate material 9. Therefore, the optical fiber 1 is pressed toward the temperature measuring object 5.

[0065] The pressing clamp 10 needs to be securely fixed to the temperature measuring object 5. As a method for fixing the pressing clamp 10 to the temperature measuring object 5, methods such as using adhesives, bonding agents, screws, and bolts can be listed.

[0066] The intermediate material 9 contacts the optical fiber 1 in such a way that the optical fiber 1 can freely expand and contract relative to the temperature measuring object 5 and the intermediate material 9 along the length of the optical fiber 1. In other words, the optical fiber 1 can expand and contract along its length relative to the temperature measuring object 5 and the intermediate material 9.

[0067] The intermediate material 9 is made of a material softer than the pressing clamp 10. This suppresses the transmission of strain generated in the temperature measuring object 5 to the optical fiber 1. Examples of materials constituting the intermediate material 9 include sponge, foam material, cushioning material, and fibrous material. Examples of fibrous material include cotton.

[0068] Figure 10 It means Figure 9 A three-dimensional view of a modified example of a temperature measuring system. Figure 10 The image shows a temperature measurement system for when optical fiber 1 is bent. Furthermore, in... Figure 10 In this study, temperature measurement object 5 is a honeycomb sandwich structure. Figure 10 In the temperature measurement system shown, the intermediate material 9 and the pressing clamp 10 also function as... Figure 9 The intermediate material 9 and the pressing clamp 10 in the temperature measurement system shown have the same function.

[0069] exist Figure 9 and Figure 10 In the temperature measurement system shown, the optical fiber 1 is not fixed to the temperature measuring object 5. Therefore, even if the temperature measuring object 5 experiences a temperature change or expansion / contraction, the strain caused by the heat generated in the temperature measuring object 5 will not be transmitted to the optical fiber 1. Furthermore, the optical fiber 1 is pressed against the temperature measuring object 5. Therefore, regardless of whether the optical fiber 1 is positioned on the upper or lower surface of the temperature measuring object 5, the temperature measurement sensitivity of the temperature measurement system will not deteriorate.

[0070] Next, the advantages of the temperature measurement system when the temperature measurement object 5 is a honeycomb sandwich structure will be explained. A honeycomb sandwich structure typically consists of a skin material and a honeycomb core, with the skin material being made of fiber-reinforced plastic. Therefore, the honeycomb sandwich structure is lightweight and highly rigid. Thermal deformation occurs in the honeycomb sandwich structure due to heat input from sunlight, heat generation from onboard equipment, etc. Consequently, the Earth pointing axis angle of mission equipment such as cameras and antennas mounted on satellites changes. In geostationary satellites positioned approximately 36,000 km from Earth, even slight changes in the Earth pointing axis angle significantly reduce the accuracy of Earth observation and positioning. Therefore, it is crucial to maintain the temperature of the honeycomb sandwich structure as uniform as possible and to suppress thermal deformation by using thermal control methods such as heaters.

[0071] like Figure 10 As shown, optical fibers 1 are arranged on both sides of a pair of skin materials in the honeycomb sandwich structure 5, which is the object of temperature measurement, thereby enabling high-density and high-precision temperature measurement of the honeycomb sandwich structure. As a result, thermal deformation generated in the honeycomb sandwich structure can be suppressed through strict thermal control.

[0072] Next, the manufacturing method of the temperature measurement system will be described. Here, the manufacturing method of the temperature measurement system when the object of temperature measurement 5 is a honeycomb sandwich structure will be described. Figure 11 This is a flowchart illustrating a method for manufacturing a temperature measuring system according to Embodiment 1 of the present invention. First, in step S101, a temporary fixing process is performed. Figure 12 This is an explanation Figure 11 The diagram shows the temporary fixing process. In the temporary fixing process, an optical fiber 1 is placed on the skin material of the honeycomb sandwich structure, which is the object of temperature measurement 5, and the optical fiber 1 is temporarily fixed relative to the honeycomb sandwich structure using a strap 11 as a temporary fixing member. Furthermore, in the temporary fixing process, the optical fiber 1 is bent, and the bent portion of the optical fiber 1 is pre-fixed to the honeycomb sandwich structure using the strap 11.

[0073] Then, as Figure 11 As shown, in step S102, a holding process is performed. Figure 13 This is an explanation Figure 11 The diagram illustrates the holding process. In the holding process, the pressing clamp 10 holds the optical fiber 1 via the intermediate material 9, and the pressing clamp 10 is installed on the temperature measuring object 5 in such a way that the pressing clamp 10 presses the optical fiber 1 against the temperature measuring object 5 via the intermediate material 9. In the holding process, the optical fiber 1 can extend and retract along its length relative to the temperature measuring object 5 and the intermediate material 9 based on temperature changes in the optical fiber 1.

[0074] Then, as Figure 11 As shown, in step S103, a temporary fixation release process is performed. In the temporary fixation release process, as... Figure 10 As shown, the tape 11 is removed from the optical fiber 1 and the temperature measuring object 5. This releases the temporary fixation of the optical fiber 1 relative to the temperature measuring object 5 via the tape 11. With the above description, the manufacturing of the temperature measuring system is complete.

[0075] As described above, the temperature measurement system of Embodiment 1 of the present invention includes a temperature measurement object 5 and an optical fiber 1 disposed on the temperature measurement object 5 and having sensitivity in both temperature and strain. Furthermore, the temperature measurement system includes an intermediate material 9 in contact with the optical fiber 1 and a pressing clamp 10 that holds the optical fiber 1 via the intermediate material 9 and presses the optical fiber 1 against the temperature measurement object 5 via the intermediate material 9. The optical fiber 1 can extend and retract along its length relative to the temperature measurement object 5 and the intermediate material 9 based on temperature changes in the optical fiber 1. Therefore, the optical fiber 1 can be freely arranged without degrading the temperature measurement sensitivity, and the temperature of the temperature measurement object 5 can be measured with high accuracy and high density. In other words, the transmission of strain generated in the temperature measurement object 5 to the optical fiber 1 can be suppressed, and the responsiveness of heat transfer from the temperature measurement object 5 to the optical fiber 1 can be improved.

[0076] It should be noted that in Embodiment 1, the structure of the optical fiber 1 equipped with the FBG sensor unit 102 was described. However, it is not limited to this, and other types of optical fibers 1, such as multi-point type or distributed type, may also be used.

[0077] Furthermore, in a variation of Embodiment 1, a honeycomb sandwich structure was used as an example to illustrate the temperature measurement object 5. However, this is not a limitation, and the temperature measurement object 5 can be applied to other satellite-borne equipment.

[0078] Implementation method 2.

[0079] Figure 14 This is a perspective view showing the temperature measuring system according to Embodiment 2 of the present invention. In Embodiment 1, a structure was described in which the FBG sensor unit 102 was covered by the pressing clamp 10. In contrast, in Embodiment 2, the optical fiber 1 is held by a pair of pressing clamps 10 of a long strip. The FBG sensor unit 102 is not covered by the pressing clamp 10. As a result, the structure of the temperature measuring system can be simplified.

[0080] Figure 15 It means Figure 14 A three-dimensional view of a modified example of a temperature measuring system. Figure 15 The image shows a temperature measurement system for when optical fiber 1 is bent. Furthermore, in... Figure 15 In the above, the temperature measurement object 5 is a honeycomb sandwich structure.

[0081] In the temperature measurement system of Embodiment 1, the entire FBG sensor section 102 of the optical fiber 1 is covered by the pressing clamp 10. On the other hand, in Figure 14 and Figure 15 In the temperature measurement system shown, the optical fiber 1 is held in place by a pair of pressing clamps 10 to the extent that it does not separate from the temperature measurement object 5. In the temperature measurement system of Embodiment 2, the volume of the intermediate material 9 and the pressing clamps 10 is reduced compared to the temperature measurement system of Embodiment 1. Other structures are the same as in Embodiment 1.

[0082] As described above, in the temperature measuring system according to Embodiment 2 of the present invention, a pair of pressing clamps 10 respectively hold the optical fiber 1 via an intermediate material 9. Thus, the same effect as Embodiment 1 can be obtained, and compared with Embodiment 1, the structure of the temperature measuring system can be simplified.

[0083] Implementation method 3.

[0084] Figure 16This is a perspective view showing the temperature measuring system according to Embodiment 3 of the present invention. In Embodiment 1, a structure in which an optical fiber 1 is disposed between the temperature measuring object 5 and the intermediate material 9 is described. In contrast, in Embodiment 3, a paste-like substance 12 is disposed around the optical fiber 1. Therefore, the paste-like substance 12 is disposed in the gap between the optical fiber 1 and the intermediate material 9 and in the gap between the temperature measuring object 5 and the intermediate material 9. The paste-like substance 12 adheres to the temperature measuring object 5, the optical fiber 1, and the intermediate material 9.

[0085] As the paste-like substance 12, a paste-like substance with an NLGI consistency number of 00 or higher and 5 or lower is used. The attachment process of the paste-like substance 12 to the temperature measuring object 5 and the optical fiber 1 is performed after the temporary fixing process and before the holding process. Through the holding process, the paste-like substance 12 is attached to the intermediate material 9.

[0086] Figure 17 It means Figure 16 A three-dimensional view of a modified example of a temperature measuring system. Figure 17 The image shows a temperature measurement system for when optical fiber 1 is bent. Furthermore, in... Figure 17 In the above, the temperature measurement object 5 is a honeycomb sandwich structure.

[0087] In the temperature measurement system of Embodiment 1, an optical fiber 1 is disposed between the temperature measurement object 5 and the intermediate material 9. Therefore, in the temperature measurement system of Embodiment 1, a gap sometimes forms between the temperature measurement object 5, the optical fiber 1, and the intermediate material 9. On the other hand, in... Figure 16 and Figure 17 In the temperature measurement system shown, a paste-like substance 12 is disposed around the optical fiber 1. The paste-like substance 12 adheres to the temperature measurement object 5, the optical fiber 1, and the intermediate material 9. Thus, the optical fiber 1 is firmly held to the temperature measurement object 5, and heat transfer from the temperature measurement object 5 to the optical fiber 1 is facilitated. Other structures are the same as in Embodiment 1. It should be noted that other structures can also be the same as in Embodiment 2.

[0088] As described above, the temperature measuring system of Embodiment 3 of the present invention includes a paste-like substance 12 attached to the temperature measuring object 5 and the optical fiber 1. This securely holds the optical fiber 1 to the temperature measuring object 5 and facilitates heat transfer from the temperature measuring object 5 to the optical fiber 1.

[0089] Implementation method 4.

[0090] Figure 18This is a perspective view showing the temperature measuring system according to Embodiment 4 of the present invention. In Embodiment 3, a structure was described in which an intermediate material 9 was disposed on the optical fiber 1 after the paste-like substance 12 was attached around the optical fiber 1. In contrast, in Embodiment 4, the paste-like substance is incorporated into the intermediate material 9. The paste-like substance in Embodiment 4 is the same as the paste-like substance in Embodiment 3.

[0091] Figure 19 It means Figure 18 A three-dimensional view of a modified example of a temperature measuring system. Figure 19 The image shows a temperature measurement system for when optical fiber 1 is bent. Furthermore, in... Figure 19 In the above, the temperature measurement object 5 is a honeycomb sandwich structure.

[0092] In the temperature measurement system of Embodiment 3, a paste-like substance 12 adheres to the temperature measurement object 5 and the optical fiber 1, with the optical fiber 1 held in the pressing clamp 10 via an intermediate material 9. On the other hand, in Figure 18 and Figure 19 In the temperature measurement system shown, the optical fiber 1 is surrounded by an intermediate material 9 infiltrated with a paste-like substance. Through the intermediate material 9, the optical fiber 1 is firmly held to the temperature measurement object 5, and heat transfer from the temperature measurement object 5 to the optical fiber 1 is facilitated. Other structures are the same as in Embodiment 3.

[0093] As described above, in the temperature measuring system according to Embodiment 4 of the present invention, a paste-like substance is incorporated into the intermediate material 9. As a result, the optical fiber 1 is firmly held to the temperature measuring object 5, and heat transfer from the temperature measuring object 5 to the optical fiber 1 becomes easier.

[0094] Explanation of reference numerals in the attached figures

[0095] 1. Optical fiber, 2. Optical circulator, 3. ASE light source, 4. Spectrometer, 5. Temperature measuring object, 6. Protective tube, 7. Conductive adhesive, 8. Frame, 9. Intermediate material, 10. Pressing clamp, 11. Belt, 12. Paste-like substance, 81. Inlet, 82. Outlet, 101. Core, 102. FBG sensor section, 103. Cladding, 104. Coating section, 105. Coating removal section.

Claims

1. A temperature measurement system, wherein the temperature measurement system comprises: a temperature measurement object; an optical fiber provided to the temperature measurement object; an intermediate material provided to the optical fiber; and a pressing jig provided to the temperature measurement object, which presses the optical fiber to the temperature measurement object via the intermediate material, the optical fiber is capable of expanding and contracting in a length direction of the optical fiber based on a temperature change of the optical fiber with respect to the temperature measurement object and the intermediate material, a paste-like substance is provided to a gap between the optical fiber and the intermediate material and a gap between the temperature measurement object and the intermediate material, a material constituting the intermediate material is any one of a sponge, a foamed material, and a fibrous substance.

2. The temperature measurement system according to claim 1, wherein an NLGI consistency number of the paste-like substance is 00 or more and 5 or less.

3. The temperature measurement system according to claim 1, wherein the intermediate material is constituted by a material softer than the pressing jig.

4. The temperature measurement system according to claim 1, wherein the pressing jig is fixed to the temperature measurement object using an adhesive, a bonding agent, a screw, or a bolt.

5. The temperature measurement system according to any one of claims 1 to 4, wherein the temperature measurement object is a honeycomb sandwich structure.

6. A manufacturing method of a temperature measurement system, wherein the manufacturing method of the temperature measurement system comprises: a temporary fixing process in which an optical fiber is temporarily fixed with respect to a temperature measurement object using a temporary fixing member; an attaching process in which a paste-like substance is attached to the temperature measurement object, the optical fiber, and an intermediate material to provide the paste-like substance to a gap between the optical fiber and the intermediate material and a gap between the temperature measurement object and the intermediate material; a holding process in which, after the attaching process, a pressing jig is installed to the temperature measurement object, whereby the pressing jig presses the optical fiber to the temperature measurement object via the intermediate material; and a temporary fixing release process in which, after the holding process, the temporary fixing of the optical fiber with respect to the temperature measurement object based on the temporary fixing member is released, in the holding process, the optical fiber is capable of expanding and contracting in a length direction of the optical fiber based on a temperature change of the optical fiber with respect to the temperature measurement object and the intermediate material, a material constituting the intermediate material is any one of a sponge, a foamed material, and a fibrous substance.

Images