JP6374658B2 - Optical fiber mounting structure - Google Patents

Description

  The present invention relates to an optical fiber mounting structure for mounting an optical fiber for measuring a state of a measurement target to the measurement target.

  Conventionally, the temperature of a measurement target such as a boiler furnace wall is mainly measured by a thermocouple. However, in the case of temperature measurement using a thermocouple, the measurement locations are limited (points). For this reason, when a high temperature spot occurs in a place different from the place assumed in the design, it is difficult to find the occurrence of this high temperature spot.

  If such a high-temperature spot is left untreated, the strength of the metal material in that region is lowered, which may cause a serious situation such as destruction of the boiler furnace wall due to internal pressure. In order to prevent such a situation, it is necessary to measure and monitor the surface temperature of the boiler furnace wall in a wider range.

  Patent Document 1 proposes that a temperature vessel continuously stores a temperature along the longitudinal direction of an optical fiber by using an optical fiber distributed thermometer in a high-pressure, high-pressure gas container or the like. In patent document 1, the optical fiber is being fixed to the surface of the iron skin of a pressure vessel using the aluminum foil tape.

JP-A-7-280665

  However, when the maximum temperature to be measured is 300 ° C. or higher, even if the optical fiber is fixed to the measurement object with the aluminum foil tape described in Patent Document 1, the adhesive performance of the aluminum foil tape is such a high temperature. Since it cannot be maintained in the state, the attached state of the optical fiber cannot be maintained.

  In order to attach an optical fiber to a measurement object that is at a high temperature of 300 ° C. or higher, for example, a metal protective tube (sheath tube) into which the optical fiber is inserted is pressed against the measurement object with a metal foil, It is conceivable to join metal foils by spot welding.

  However, this attachment method takes time and labor to fix the optical fiber protective tube, and the productivity is extremely low. In particular, when measuring the temperature distribution of the entire membrane panel of the boiler, the laying distance of the optical fiber becomes long, so it is extremely difficult to cope with the mounting method by spot welding of the metal foil.

  As described above, conventionally, there is no means for properly attaching an optical fiber over a wide range to a measurement target that is in a high temperature state such as a boiler furnace wall, and the optical fiber is used over a wide range for temperature measurement of the measurement target that becomes high temperature Was extremely difficult or impossible.

  Therefore, an object of the present invention is to provide an optical fiber mounting structure capable of easily mounting an optical fiber for measuring a high temperature state on a measurement target such as a boiler furnace wall where the maximum temperature reached during operation is extremely high. There is.

  In order to solve the above problems, the present invention provides an optical fiber mounting structure for mounting an optical fiber for measuring a state of a high-temperature measurement target to the measurement target, and uses the mechanical fastening force to Mechanical attachment means for attaching an optical fiber to the measurement object is provided.

  Preferably, the mechanical attachment means includes a fixing fitting attached to the measurement target, and the fixing fitting and the measurement target are sandwiched and fixed by a protective tube through which the optical fiber is inserted.

  In addition, preferably, the fixing bracket is configured by a leaf spring attached to the measurement target.

  Preferably, the mechanical attachment means further includes a stud bolt attached to the measurement target and a nut screwed to the stud bolt, and the fixing bracket is screwed to the stud bolt. The nut is fixed to the object to be measured.

  Preferably, the mechanical attachment means has a receiving groove for receiving the optical fiber formed in the measurement object along a laying position of the optical fiber, and the protection into which the optical fiber is inserted. The protective tube of the optical fiber is fixed to the receiving groove by deforming the edge of the receiving groove while the tube is in the receiving groove.

  Preferably, the edge portion of the receiving groove is formed by a protruding portion protruding from the measurement target.

  Preferably, the mechanical attachment means has a receiving groove for receiving the optical fiber formed in the measurement object along a laying position of the optical fiber, and the protection into which the optical fiber is inserted. A tube is press fitted into the receiving groove and secured.

  Preferably, the mechanical attachment means has a receiving groove for receiving the optical fiber formed in the measurement object along a laying position of the optical fiber, and the protection into which the optical fiber is inserted. The tube is plastically deformed and fixed inside the receiving groove.

  In order to solve the above-mentioned problems, the present invention provides an optical fiber mounting structure for mounting an optical fiber for measuring a state of a high-temperature measurement target to the measurement target, the optical fiber being installed along the laying position of the optical fiber. A receiving groove for receiving the optical fiber, and a sealing member for sealing the upper surface opening of the receiving groove in a state where the optical fiber is placed in the receiving groove; It is characterized by that.

  Preferably, the sealing member is a part of a heat insulating material laid on the high temperature measurement object.

  Preferably, the sealing member is a plate member fixed to the high-temperature measurement object.

  Preferably, the plate member has elasticity, and the plate member is attached inside the receiving groove using the elasticity.

  Preferably, the receiving groove is formed by a protruding portion projecting from the measurement object, the plate member has elasticity, and a side edge of the plate member is bent, and the elasticity is increased. The side edge portion of the plate member is engaged and attached to the outer surface of the protruding portion.

  According to the present invention, an optical fiber for measuring a high temperature state can be easily attached to a measurement target in which the maximum temperature reached during operation is extremely high, such as a boiler furnace wall.

The schematic diagram which showed the optical fiber attachment structure by one Embodiment of this invention. The schematic diagram which showed the optical fiber attachment structure by other embodiment of this invention. The schematic diagram which showed the optical fiber attachment structure by other embodiment of this invention. The schematic diagram which showed the optical fiber attachment structure by other embodiment of this invention. The schematic diagram which showed the optical fiber attachment structure by the modification of embodiment shown in FIG. The schematic diagram which showed the optical fiber attachment structure by other embodiment of this invention. The schematic diagram which showed the optical fiber attachment structure by the modification of embodiment shown in FIG. The schematic diagram which showed the optical fiber attachment structure by the other modification of embodiment shown in FIG. The schematic diagram which showed the optical fiber attachment structure by other embodiment of this invention. The schematic diagram which showed the optical fiber attachment structure by other embodiment of this invention. The schematic diagram which showed the optical fiber attachment structure by other embodiment of this invention. The schematic diagram which showed the optical fiber attachment structure by other embodiment of this invention. The schematic diagram which showed the optical fiber attachment structure by other embodiment of this invention. The schematic diagram for demonstrating the case where the optical fiber attachment structure by one Embodiment of this invention is applied to the membrane panel of a boiler. The schematic diagram for demonstrating the case where the optical fiber attachment structure by other embodiment of this invention is applied to the membrane panel of a boiler.

  Hereinafter, an optical fiber mounting structure according to an embodiment of the present invention will be described with reference to FIG.

  The optical fiber attachment structure 10 according to the present embodiment includes a fixture (mechanical attachment means) 11 constituted by a leaf spring fixed to the measurement object 1 by laser welding or the like.

  As shown in FIGS. 1A, 1 </ b> B, and 1 </ b> C, the fixing bracket 10 and the measurement target 1 sandwich the protective tube (sheath tube) 2 through which the optical fiber is inserted, thereby fixing the fixing bracket 10. The protective tube 2 is fixed to the measuring object 1 by using a mechanical fastening force due to the spring force.

  In addition, the measuring object 1 is a wall surface of a boiler furnace wall, for example, and the highest attained temperature at the time of an operation will be 300 degreeC or more. With the optical fiber, it is possible to continuously measure the temperature distribution and strain distribution of the high-temperature measurement object along the longitudinal direction of the optical fiber.

  The optical fiber is typically made of quartz glass, and is usually provided with a coating on the outer peripheral surface thereof. The protective tube 2 through which the optical fiber is inserted is formed of a heat resistant material that is a metal material or a non-metal material.

  According to the optical fiber mounting structure 10 according to the present embodiment, the protective tube 2 of the optical fiber is fixed to the measurement object 1 using the mechanical fastening force of the fixing bracket 11, so that the temperature is high as in the boiler furnace wall. Even in the measurement object, the attachment state of the optical fiber can be reliably maintained.

  Further, as shown in FIGS. 1 (a), (b), and (c), the operator simply lifts the fixing bracket 11 with a finger and inserts the protective tube 2 of the optical fiber into the optical fiber. The protective tube 2 can be easily fixed to the measurement target 1.

  Since it is a simple attachment method, construction on a large structure such as a boiler becomes easy. Moreover, since the optical fiber can be removed due to the reversibility of the leaf spring, the construction can be reworked and the optical fiber can be replaced.

  FIG. 2 shows an optical fiber mounting structure 20 according to another embodiment of the present invention.

  The optical fiber attachment structure 20 according to the present embodiment further includes a stud bolt 21 attached to the measurement object 1 and a nut 22 screwed to the stud bolt 21 as mechanical attachment means.

  In the optical fiber mounting structure 20 according to the present embodiment, as shown in FIGS. 2A, 2 </ b> B, and 2 </ b> C, the fixing bracket 11 is attached by the nut 22 screwed to the stud bolt 21. Fixed to measurement object 1.

  Also in the optical fiber mounting structure 20 according to the present embodiment, the optical fiber protective tube 2 is fixed to the measurement object 1 using the mechanical fastening force of the fixing bracket 11, the stat bolt 21 and the nut 22, so Even in a high-temperature measurement object such as a boiler furnace wall, the optical fiber mounting state can be reliably maintained.

  Also, in the optical fiber mounting structure 20 according to the present embodiment, as shown in FIGS. 2A, 2B, and 2C, by tightening the nut 22 screwed to the stud bolt 21, The protective tube 2 of the optical fiber can be easily fixed to the measurement object 1. Since it is a simple attachment method, construction on a large structure such as a boiler becomes easy.

  FIG. 3 shows an optical fiber mounting structure 30 according to another embodiment of the present invention.

  The optical fiber mounting structure 30 according to the present embodiment has a receiving groove 31 for receiving the optical fiber protective tube 2 formed in the measuring object 1 along the laying position of the optical fiber as a mechanical mounting means.

  Then, as shown in FIGS. 3A, 3B, and 3C, the edge portion of the receiving groove 31 with the hammer 32 or the like with the protective tube 2 of the optical fiber placed in the receiving groove 31. Is deformed to fix the protective tube 2 of the optical fiber to the receiving groove 31.

  Also in the optical fiber mounting structure 30 according to the present embodiment, the protective tube 2 of the optical fiber is fixed to the measuring object 1 by using the mechanical fastening force of the measuring object 1 plastically deformed. Even in a high-temperature measurement object, the optical fiber mounting state can be reliably maintained.

  If the linear expansion coefficient of the protective tube 2 is selected so as to be larger than the linear expansion coefficient of the measurement object 1, the higher the temperature, the stronger the tightening, and the heat transfer performance and the fixing performance can be improved.

  Also in the optical fiber mounting structure 30 according to the present embodiment, as shown in FIGS. 3A, 3B, and 3C, the edge of the receiving groove 31 is deformed to protect the optical fiber. The tube 2 can be easily fixed to the measurement object 1. Since it is a simple attachment method, construction on a large structure such as a boiler becomes easy.

  FIG. 4 shows an optical fiber mounting structure 40 according to another embodiment of the present invention.

  In the optical fiber mounting structure 40 according to the present embodiment, the edge of the receiving groove 41 is formed by a protruding portion 42 protruding from the measurement target 1.

  4 (a), 4 (b), and 4 (c), the edge portion of the receiving groove 41 with the hammer 32 or the like with the protective tube 2 of the optical fiber placed in the receiving groove 41. The protective tube 2 of the optical fiber is fixed to the receiving groove 41 by deforming the protruding portion 42 that forms the shape.

  Also in the optical fiber mounting structure 40 according to the present embodiment, the optical fiber protective tube 2 is fixed to the measuring object 1 by utilizing the mechanical fastening force by the plastically deformed protrusion 42, so that it looks like a boiler furnace wall. Even in a high-temperature measurement object, the optical fiber mounting state can be reliably maintained.

  Also in the optical fiber mounting structure 40 according to the present embodiment, as shown in FIGS. 4A, 4 </ b> B, and 4 </ b> C, the protrusion 42 that forms the edge of the receiving groove 41 is deformed. Thus, the protective tube 2 of the optical fiber can be easily fixed to the measurement object 1. Since it is a simple attachment method, construction on a large structure such as a boiler becomes easy.

  Also, in the optical fiber mounting structure 40 according to the present embodiment, if the linear expansion coefficient of the protective tube 2 is selected to be larger than the linear expansion coefficient of the measurement target 1, the higher the temperature, the stronger the tightening. Heat transfer performance and fixing performance can be improved.

  As a modification of the optical fiber mounting structure 40 according to the present embodiment, as shown in FIG. 4A, the protruding portion 42 may be formed only on one side. In this case, the height of the projecting portion 42 may be set higher than when it is provided on both sides shown in FIG.

  FIG. 5 shows an optical fiber mounting structure 50 according to another embodiment of the present invention.

  In the optical fiber mounting structure 50 according to the present embodiment, the receiving groove 51 is formed by a protruding portion 52 protruding from the measurement object 1. The entrance of the receiving groove 51 has a width that is slightly smaller than the diameter of the protective tube 2 of the optical fiber. The shape of the inner wall surface of the receiving groove 51 substantially matches the shape of the outer peripheral surface of the protective tube 2.

  5A, 5B, and 5C, the protective tube 2 is pushed into the receiving groove 51 by pushing the protective tube 2 of the optical fiber into the receiving groove 51 with a hammer 32 or the like. It is press-fitted and fixed. Instead of the hammer 32, the protective tube 2 can be continuously pushed by a roller.

  Also in the optical fiber mounting structure 50 according to the present embodiment, since the optical fiber protective tube 2 is fixed to the measurement object 1 using the mechanical fastening force by press fitting, measurement at a high temperature such as a boiler furnace wall is performed. Even in the object, the attachment state of the optical fiber can be reliably maintained.

  Also, in the optical fiber mounting structure 50 according to the present embodiment, the optical fiber protective tube 2 is press-fitted into the receiving groove 51 as shown in FIGS. The optical fiber protective tube 2 can be easily fixed to the measuring object 1. Since it is a simple attachment method, construction on a large structure such as a boiler becomes easy.

  Moreover, since the optical fiber attachment structure 50 by this embodiment has a large contact area of the outer peripheral surface of the protective tube 2 of an optical fiber, and the inner wall face of the receiving groove 51, it can improve the responsiveness of temperature measurement.

  Also, in the optical fiber mounting structure 50 according to the present embodiment, if the linear expansion coefficient of the protective tube 2 is selected to be larger than the linear expansion coefficient of the measurement target 1, the higher the temperature, the tighter the tightening. Heat transfer performance and fixing performance can be improved.

  As a modification of the optical fiber mounting structure 50 according to the present embodiment, as shown in FIG. 5A, the shape of the receiving groove 51 is U-shaped, and the groove width is the outer diameter of the protective tube 2 of the optical fiber. You may make it set a little narrower than.

  Further, as shown in FIG. 5B, the receiving groove 51 may be an Ω (ohm) type, and the groove width at the entrance may be set slightly narrower than the outer diameter of the protective tube 2 of the optical fiber.

  FIG. 6 shows an optical fiber mounting structure 60 according to another embodiment of the present invention.

  In the optical fiber mounting structure 60 according to the present embodiment, a receiving groove 61 is formed in the measurement object 1. The receiving groove 61 has such a depth dimension that a part of the protective tube 2 protrudes outward when the optical fiber protective tube 2 is fitted.

  Then, as shown in FIGS. 6A, 6B, and 6C, the protective tube 2 protruding from the receiving groove 61 is hit with a hammer 32 or the like to plastically deform the protective tube 2, The protective tube 2 is fixed to the receiving groove 61.

  Also in the optical fiber mounting structure 60 according to the present embodiment, the optical fiber protective tube 2 is fixed to the measuring object 1 by using the mechanical fastening force of the plastically deformed protective tube 2, so that it looks like a boiler furnace wall. Even in a high-temperature measurement object, the optical fiber mounting state can be reliably maintained.

  Also in the optical fiber mounting structure 60 according to the present embodiment, the optical fiber protective tube 2 is deformed in the receiving groove 61 as shown in FIGS. 6A, 6B, and 6C. The optical fiber protective tube 2 can be easily fixed to the measuring object 1. Since it is a simple attachment method, construction on a large structure such as a boiler becomes easy.

  Further, the optical fiber mounting structure 60 according to the present embodiment has an advantage that there is no portion protruding from the measurement target 1.

  Also, in the optical fiber mounting structure 60 according to the present embodiment, if the linear expansion coefficient of the protective tube 2 is selected to be larger than the linear expansion coefficient of the measurement target 1, the higher the temperature, the tighter the tightening. Heat transfer performance and fixing performance can be improved.

  FIG. 7 shows an optical fiber mounting structure 70 according to another embodiment of the present invention.

  The optical fiber mounting structure 70 according to the present embodiment includes a receiving groove 71 for receiving the optical fiber 3 or its protective tube 2 formed in the measurement object 1 along the laying position of the optical fiber 3 as a mechanical mounting means. Have.

  Then, as shown in FIG. 7 (a) or FIG. 7 (b), with the optical fiber 3 or its protective tube 2 placed in the receiving groove 71, the upper surface opening of the receiving groove 71 is covered with a heat insulating material (sealed). Sealing member 72). The heat insulating material 72 is a part of the heat insulating material laid on the measurement target 1 such as a boiler.

  According to the optical fiber mounting structure 70 according to the present embodiment, the optical fiber 3 or its protective tube 2 is inserted into the receiving groove 71 formed in the measurement object 1, and the upper surface opening of the receiving groove 71 is sealed with the heat insulating material 72. Therefore, the attachment state of the optical fiber 3 can be reliably maintained even in a high-temperature measurement object such as a boiler furnace wall.

  Further, as shown in FIG. 7A or 7B, the optical fiber 3 or its protective tube 2 can be easily attached to the measurement object 1 simply by sealing the upper surface opening of the receiving groove 71 with the heat insulating material 72. Can be attached to. Since it is a simple attachment method, construction on a large structure such as a boiler becomes easy.

  Moreover, the responsiveness of temperature measurement can be improved by inserting the optical fiber 3 into the receiving groove 71 as it is as shown in FIG.

  FIG. 8 shows an optical fiber mounting structure 80 according to another embodiment of the present invention.

  In the optical fiber mounting structure 80 according to the present embodiment, as shown in FIG. 8A or FIG. 8B, the plate member whose upper surface opening of the receiving groove 81 is fixed to the measurement object 1 by welding or the like. (Sealing member) 81 is sealed.

  Also in the optical fiber mounting structure 80 according to the present embodiment, the optical fiber 3 or its protective tube 2 is inserted into the receiving groove 81 formed in the measurement object 1, and the upper opening of the receiving groove 81 is sealed with the plate member 81. Therefore, the attachment state of the optical fiber 3 can be reliably maintained even in a high-temperature measurement object such as a boiler furnace wall.

  Also in the optical fiber mounting structure 80 according to the present embodiment, as shown in FIG. 8A or FIG. 8B, the optical fiber can be simply sealed by sealing the upper surface opening of the receiving groove 81 with the plate member 82. 3 or its protective tube 2 can be easily attached to the measuring object 1. Since it is a simple attachment method, construction on a large structure such as a boiler becomes easy.

  FIG. 9 shows an optical fiber mounting structure 90 according to another embodiment of the present invention.

  The optical fiber mounting structure 90 according to the present embodiment has a receiving groove 91 for receiving the optical fiber 3 formed in the measuring object 1 along the laying position of the optical fiber 3 as a mechanical mounting means. The receiving groove 91 is formed by a protruding portion 92 protruding from the measurement target 1.

  As shown in FIGS. 9A, 9 </ b> B, and 9 </ b> C, the upper surface opening of the receiving groove 91 is sealed with the plate member 93 in a state where the optical fiber 3 is inserted into the receiving groove 91. The plate member 93 has elasticity, and the plate member 93 is attached to the inside of the receiving groove 91 using this elasticity.

  Also in the optical fiber mounting structure 90 according to the present embodiment, since the optical fiber 3 is inserted into the receiving groove 91 formed in the measurement object 1 and the receiving groove 91 is sealed by the plate member 90, it is like a boiler furnace wall. Even in a high-temperature measurement object, the attachment state of the optical fiber 3 can be reliably maintained.

  Moreover, also in the optical fiber attachment structure 90 according to the present embodiment, the optical fiber 3 can be easily attached to the measurement object 1 simply by fitting the plate member 93 into the receiving groove 91.

  Since it is a simple attachment method, construction on a large structure such as a boiler becomes easy. Moreover, since the optical fiber can be removed due to the reversibility of the leaf spring, the construction can be reworked and the optical fiber can be replaced.

  FIG. 10 shows an optical fiber mounting structure 100 according to another embodiment of the present invention.

  The optical fiber mounting structure 100 according to the present embodiment has a receiving groove 101 for receiving the optical fiber 3 formed in the measurement object 1 along the laying position of the optical fiber 3 as mechanical mounting means. The receiving groove 101 is formed by a protruding portion 102 protruding from the measurement target 1. The protrusion 102 has an inclined side surface 102A that is inclined outward in the protrusion direction.

  As shown in FIGS. 10A, 10 </ b> B, and 10 </ b> C, the upper surface opening of the receiving groove 101 is sealed with an elastic plate member 103 in a state where the optical fiber 3 is inserted into the receiving groove 101. To do.

  The side edge portion 103 </ b> A of the plate member 103 is bent, and the side edge portion 103 </ b> A is engaged with and attached to the inclined side surface 102 </ b> A of the protruding portion 102 using the elasticity of the plate member 103.

  Also in the optical fiber mounting structure 100 according to the present embodiment, since the optical fiber 3 is inserted into the receiving groove 101 formed in the measurement object 1 and the receiving groove 101 is sealed by the plate member 100, it is like a boiler furnace wall. Even in a high-temperature measurement object, the attachment state of the optical fiber 3 can be reliably maintained.

  In the optical fiber attachment structure 100 according to the present embodiment, the optical fiber 3 can be easily attached to the measurement object 1 simply by engaging the side edge portion 103A of the plate member 103 with the inclined side surface 102A of the protruding portion 102. it can.

  Since it is a simple attachment method, construction on a large structure such as a boiler becomes easy. Moreover, since the optical fiber can be removed due to the reversibility of the leaf spring, the construction can be reworked and the optical fiber can be replaced.

  11 and 12 show a case where the various optical fiber mounting structures described above are provided on the outer surface of the membrane panel 4 constituting the boiler furnace wall.

  The membrane panel 4 includes an evaporation pipe portion 5 through which water flows, and a fin portion 6 that connects the evaporation pipe portions 5 to each other. The optical fiber mounting structure is provided on the outer surface of the fin portion 6 of the membrane panel 4.

  The various optical fiber mounting structures described above can be provided in advance on a measurement target such as the membrane panel 4 before actually mounting the optical fiber. Thereby, the installation work of the optical fiber in the field can be simplified.

DESCRIPTION OF SYMBOLS 1 Measurement object 2 Optical fiber protective tube 3 Optical fiber 4 Membrane panel 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 Optical fiber attachment structure 11 Fixing bracket (mechanical attachment means)
21 Stud bolt (Mechanical mounting means)
22 Nut (Mechanical mounting means)
31, 41, 51, 61, 71, 81, 91, 101 receiving groove (mechanical attachment means)
32 Hammer 42 Protruding part forming edge of receiving groove 52, 92, 102 Protruding part forming receiving groove 72 Heat insulating material (sealing member)
82 Plate member (sealing member)
93, 103 Elastic plate member (sealing member)
102A Inclined side surface of protrusion

Claims (4)

An optical fiber mounting structure for mounting an optical fiber for measuring a state of a high-temperature measurement target to the measurement target,
E Bei mechanical attachment means for utilizing a mechanical fastening force attaching said optical fiber to the measurement object,
The mechanical attachment means includes a fixing bracket attached to the measurement target, and sandwiches and fixes a protective tube through which the optical fiber is inserted between the fixing bracket and the measurement target,
The mechanical attachment means further includes a stud bolt attached to the measurement target, and a nut screwed to the stud bolt,
An optical fiber mounting structure in which the fixing bracket is fixed to the measurement object by the nut screwed to the stud bolt . The fixing bracket, the measurement target is composed of mounted leaf spring, the optical fiber mounting structure according to claim 1, wherein. An optical fiber mounting structure for mounting an optical fiber for measuring a state of a high-temperature measurement target to the measurement target,
Mechanical attachment means for attaching the optical fiber to the measurement object using a mechanical fastening force;
The mechanical attachment means has a receiving groove for receiving the optical fiber, which is formed in the measurement object along the laying position of the optical fiber,
The protective tube of the optical fiber is fixed to the receiving groove by deforming the edge of the receiving groove with the protective tube into which the optical fiber is inserted in the receiving groove,
The optical fiber mounting structure, wherein the edge of the receiving groove is formed by a protruding portion protruding from the measurement target. An optical fiber mounting structure for mounting an optical fiber for measuring a state of a high-temperature measurement target to the measurement target,
Mechanical attachment means for attaching the optical fiber to the measurement object using a mechanical fastening force;
The mechanical attachment means has a receiving groove for receiving the optical fiber, which is formed in the measurement object along the laying position of the optical fiber,
An optical fiber mounting structure in which a protective tube into which the optical fiber is inserted is plastically deformed and fixed inside the receiving groove.

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