Device for detecting high temperature resistance of fiber bragg grating temperature sensor

Abstract

The invention discloses a fiber grating temperature sensor high temperature resistance detection device, and relates to the technical field of sensor detection, and the device comprises a rack, the rack is provided with an optical fiber line, the outer side of the optical fiber line provided with grating detection points is provided with high temperature detection mechanisms, and the high temperature detection mechanisms are uniformly arranged along the grating detection points of the optical fiber line. High-temperature heaters are fixedly arranged on the machine frame, the high-temperature heaters are connected with heat preservation pipes, the high-temperature heaters are connected with the high-temperature detection mechanisms located at the end portions of the optical fiber lines through the heat preservation pipes, flexible folding pipes are connected between the adjacent high-temperature heaters, and the high-temperature detection mechanisms located at the end portions and the machine frame are fixedly installed. An axial sliding groove is formed in the machine frame, and twisting mechanisms are slidably installed and connected between the other high-temperature detection mechanisms and the axial sliding groove. And high-temperature detection data comparison is performed by combining a high-temperature heater and a high-temperature detection mechanism, so that the data accuracy of a grating detection point location is obtained.

Description

Technical Field

[0001] The invention relates to the technical field of sensor detection, in particular to a high temperature resistance detection device of a fiber grating temperature sensor. Background Art

[0002] Fiber Bragg Grating temperature sensor is a sensor that uses fiber Bragg grating technology to measure temperature. It has the following advantages: High precision: It can provide relatively accurate temperature measurement results. Anti-electromagnetic interference: It is not affected by electromagnetic interference and is suitable for complex electromagnetic environments. Good stability: It has high long-term working stability. Small size and light weight: It is easy to install and use. It can transmit signals over long distances: It can achieve long-distance signal transmission through optical fiber. This sensor is widely used in many fields, such as petrochemical, electric power, aerospace, bridge monitoring, etc., for real-time monitoring and control of temperature to ensure the safe operation of equipment and the quality of engineering.

[0003] Due to the characteristics of optical fiber, fiber Bragg grating temperature sensors have the disadvantages of being easily damaged and having high installation requirements. Fiber Bragg gratings are generally encapsulated in copper tubes to improve the bending resistance and anti-interference capabilities of fiber Bragg grating sensors. Existing fiber Bragg grating temperature sensors are insufficiently resistant to external environmental interference when collecting sensing data in high-temperature environments. The fiber Bragg grating temperature sensor's ability to resist environmental interference cannot be fully evaluated before use, and the reliability of temperature data collection during temperature detection cannot be guaranteed. Summary of the invention

[0004] The object of the present invention is to provide a device for detecting the high temperature resistance of a fiber Bragg grating temperature sensor to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A high temperature resistance detection device for a fiber grating temperature sensor comprises a frame, an optical fiber line is arranged on the frame, an optical connector at the end of the optical fiber line is fixedly mounted on one end of the frame, the optical fiber line is suspended and mounted on the upper side of the frame, a high temperature detection mechanism is arranged on the outer side of the optical fiber line where grating detection points are arranged, the high temperature detection mechanism is evenly arranged along the grating detection points of the optical fiber line, a high temperature heater is fixedly arranged on the frame, the high temperature heater is connected to a heat preservation tube, the high temperature heater is connected to the high temperature detection mechanism at the end of the optical fiber line through the heat preservation tube, a flexible folding tube is connected between adjacent high temperature heaters, the high temperature detection mechanism at the end is fixedly mounted between the frame, an axial slide groove is arranged on the frame, and the remaining high temperature detection mechanisms are slidably mounted between the axial slide groove and are connected to a twisting mechanism.

[0006] As a further scheme of the present invention: the high temperature detection mechanism includes a mounting column, the mounting column is connected to an annular frame, the inner ring of the annular frame is provided with an intermediate retaining frame, the optical fiber line passes through the center of the intermediate retaining frame, folding sleeves are provided on both sides of the annular frame, and insulation edge frames are provided at the ends of the folding sleeves. The center of the optical fiber line passes through the center of the insulation edge frame, and a docking tray is provided on the side of the intermediate retaining frame. The docking tray and the optical fiber line are sleeved, and a snap-fit ​​frame is provided on the docking tray. A transfer tube is provided between the snap-fit ​​frame and the insulation tube, and a hollow groove is provided in the snap-fit ​​frame, and the optical fiber line is exposed in the hollow groove. Grating detection points are provided in the optical fiber line located in the hollow groove, and air guide holes are provided on the sides of the hollow groove. Transfer holes are arranged in a ring on the intermediate retaining frame, and the air guide holes are connected to the docking tray, and the snap-fit ​​frame is connected to a rotation drive assembly.

[0007] As a further scheme of the present invention: the rotation driving assembly includes an annular matching frame arranged on the side of the middle retaining frame, a matching slider is slidably installed on the annular matching frame, a synchronization rod is arranged between the matching slider and the snap-on frame, a magnet block is arranged on the matching slider, the magnet block is fitted and installed with the inner ring of the annular frame, the outer ring of the annular frame is arranged with an annular slide groove, an adsorption frame is slidably installed in the annular slide groove, the adsorption frame and the magnet block are adsorbed on each other, a clamping annular groove and an outer gear ring are respectively arranged on both sides of the annular slide groove, an arc-shaped fitting frame is fitted and installed on the edge of the annular frame, a motor 1 is arranged on the arc-shaped fitting frame, the motor 1 is connected with a gear 1 and a matching pulley, the gear 1 and the outer gear ring are meshed with each other, the matching pulley is slidably installed between the clamping annular groove, and the adsorption frame is rotatably installed between the output shaft of the motor 1.

[0008] As a further solution of the present invention: the twisting mechanism includes a sliding card frame arranged in the axial slide groove, an arc frame is fixedly arranged on the sliding card frame, the arc frame is symmetrically arranged along the axial slide groove, an arc slide groove is arranged in the arc frame, a vertical connecting column is slidably installed in the arc slide groove, the vertical connecting column is connected to the high temperature detection mechanism, a motor 2 is fixedly arranged on the vertical connecting column, the motor 2 is connected to gear 2, an arc rack is arranged on the inner ring of the arc frame, the gear 2 and the arc rack are meshed with each other, and a twisting direction control mechanism is arranged between adjacent twisting mechanisms.

[0009] As a further solution of the present invention: the twisting direction control mechanism includes a connecting flange arranged on the side of the vertical connecting column, an extension plate is rotatably installed on the connecting flange, an intermediate plate is telescopically inserted into the end of the extension plate, a matching hole is arranged in the middle part of the intermediate plate, a mounting seat is fixedly arranged in the axial slide groove, a telescopic motor is arranged on the mounting seat, the telescopic motor is connected to a matching rod, the matching rod and the matching hole cooperate with each other, a control frame is arranged at the connecting part of the extension plate and the intermediate plate, the control frame is respectively slidably and telescopically installed between the extension plate and the intermediate plate, electromagnets are evenly arranged on the control frame, and the extension plate and the intermediate plate are made of iron material.

[0010] As a further solution of the present invention: the arc frames of the adjacent twisting mechanisms are arranged in the same direction, the electromagnet is powered off when the matching rod is matched with the matching hole, and the electromagnet is powered on when the matching rod is separated from the matching hole.

[0011] As a further solution of the present invention: a groove is provided on the annular matching frame, and the matching slider is slidably engaged with the groove.

[0012] Compared with the prior art, the present invention has the following beneficial effects: (1) The optical fiber line is supported and installed by a ring frame and an intermediate retaining frame. At the same time, a folding sleeve and a heat-insulating edge frame are arranged on both sides of the ring frame to form a closed space, thereby avoiding interference of the external environment on the high-temperature detection mechanism during high-temperature detection, and facilitating constant maintenance of the temperature inside the high-temperature detection mechanism, so as to perform long-term detection. At the same time, in order to measure the circumferential multi-point detection data of the grating detection point, a snap-fit ​​frame is arranged outside the grating detection point, and the snap-fit ​​frame is driven by a rotating drive assembly to rotate outside the optical fiber line, so that the high-temperature air transmitted by the transmission tube enters the inside of the snap-fit ​​frame and directly acts on the optical fiber line, and at the same time forms a circumferential rotation detection, thereby comparing the consistency of the multi-directional detection data of the grating detection point.

[0013] (2) The motor drives the gear to rotate, and the pulley is combined to make the adsorption frame slide along the annular groove. When the adsorption frame slides in the annular groove, it will drive the magnet block to slide synchronously. The magnet block and the matching slider and the synchronization rod drive the snap-fit ​​frame to rotate around the central axis of the intermediate retaining frame, and then drive the snap-fit ​​frame to rotate circumferentially on the optical fiber line, so that the high-temperature airflow brought by the transfer tube can act on the grating detection points at multiple points, realizing all-round detection of the grating detection points.

[0014] (3) By setting up the extension plate, the middle plate and the control frame, when the matching rod and the matching hole are separated, the electromagnet is energized, and the control frame adsorbs the extension plate and the middle plate, so that the extension plate and the middle plate cannot slide against each other and change the length. At this time, when the motor 2 drives the gear 2 to mesh with the arc-shaped rack, it will drive the adjacent high-temperature detection mechanism to slide along the arc-shaped slide groove, so that the optical fiber line will bend in the same direction. When the matching rod and the matching hole are matched with each other, the electromagnet is de-energized, and the middle plate will rotate around the matching rod. At this time, when the motor 2 drives the high-temperature detection mechanism on one side to slide along the arc-shaped slide groove, the high-temperature detection mechanism on the other end will rotate in the opposite direction. At the same time, the extension plate, the control frame and the middle plate slide against each other to adjust the overall length. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0016] Figure 2 It is a schematic diagram of the internal installation structure of the fiber grating sensor and the high temperature detection mechanism in the present invention.

[0017] Figure 3 It is a schematic diagram of the cooperation between the snap-fit ​​frame and the fiber grating sensor in the present invention.

[0018] Figure 4 It is a schematic diagram of another angle of cooperation between the snap-fit ​​frame and the fiber grating sensor in the present invention.

[0019] Figure 5 It is a schematic diagram of the structure of the rotary drive assembly in the present invention.

[0020] Figure 6 It is a schematic diagram of the installation of adjacent grating points in the optical fiber line of the present invention.

[0021] Figure 7 It is a structural schematic diagram of the twisting mechanism in the present invention.

[0022] Figure 8 It is a structural schematic diagram of the twisting direction control mechanism in the present invention.

[0023] In the figure: 1, frame; 10, axial slide; 2, optical connector; 20, optical fiber line; 3, high temperature heater; 30, insulation tube; 31, flexible folding tube; 4, high temperature detection mechanism; 40, mounting column; 41, annular frame; 42, folding sleeve; 43, insulation edge frame; 44, transfer tube; 45, snap-fit ​​frame; 450, hollow groove; 451, air guide hole; 452, docking plate; 47, intermediate retaining frame; 470, transfer hole; 48, synchronization rod; 49, matching slider; 410, annular matching frame; 411, magnet block; 4101, annular slide; 410 2. Outer gear ring; 4103. Snap-fit ​​annular groove; 4104. Arc-shaped fitting frame; 4105. Motor 1; 4106. Gear 1; 4107. Adsorption frame; 4108. Matching pulley; 5. Twisting mechanism; 50. Sliding snap-fit ​​frame; 51. Arc-shaped frame; 52. Arc-shaped slide groove; 53. Vertical connecting column; 54. Motor 2; 55. Gear 2; 56. Arc-shaped rack; 6. Twisting direction control mechanism; 60. Connecting flange; 61. Extension plate; 62. Middle plate; 63. Control frame; 64. Electromagnet; 65. Mounting seat; 66. Telescopic motor; 67. Matching hole. DETAILED DESCRIPTION

[0024] The technical solution of the present invention is further described in detail below in conjunction with specific implementation methods.

[0025] like Figure 1 As shown, a high temperature resistance detection device of a fiber grating temperature sensor comprises a frame 1, an optical fiber line 20 is arranged on the frame 1, an optical connector 2 at the end of the optical fiber line 20 is fixedly installed with one end of the frame 1, the optical fiber line 20 is suspended and installed on the upper side of the frame 1, a high temperature detection mechanism 4 is arranged on the outer side of the grating detection points arranged on the optical fiber line 20, the high temperature detection mechanism 4 is evenly arranged along the grating detection points of the optical fiber line 20, a high temperature heater 3 is fixedly arranged on the frame 1, the high temperature heater 3 is connected with a heat preservation tube 30, the high temperature heater 3 is connected to the high temperature detection mechanism 4 located at the end of the optical fiber line 20 through the heat preservation tube 30, a flexible folding tube 31 is connected between adjacent high temperature heaters 3, the high temperature detection mechanism 4 located at the end is fixedly installed with the frame 1, an axial slide groove 10 is arranged on the frame 1, and the remaining high temperature detection mechanisms 4 are slidably installed with the axial slide groove 10 and are connected with a twisting mechanism 5.

[0026] Specifically, the optical fiber line 20 is connected to the fiber grating analyzer through the optical connector 2 at the end, so as to measure and read the temperature data of the grating detection point in the optical fiber line 20. The optical fiber line 20 with the grating detection point is wrapped and set in the high-temperature detection mechanism 4, and the temperature is adjusted and detected in combination with the high-temperature heater 3. At the same time, the temperature is transferred to multiple high-temperature detection mechanisms 4 in combination with the flexible folding tube 31, and the temperature of multiple grating detection points on the optical fiber line 20 is detected. The grating point measurement data when the high temperature changes is compared with the set temperature data of the high-temperature heater 3, so as to judge the high-temperature detection accuracy of the fiber grating temperature sensor.

[0027] At the same time, the high temperature detection mechanism 4 of the remaining grating detection points is connected to the twisting mechanism 5, and the optical fiber line 20 is dynamically controlled to be twisted during detection, so as to further detect the accuracy of temperature detection when the external environment interferes with the optical fiber line 20.

[0028] Further, such as Figure 2 , Figure 3 , Figure 4 As shown, the high temperature heater 3 includes a mounting post 40, the mounting post 40 is connected to a ring frame 41, the inner ring of the ring frame 41 is provided with an intermediate retaining frame 47, the optical fiber line 20 passes through the center of the intermediate retaining frame 47, folding sleeves 42 are provided on both sides of the ring frame 41, and the ends of the folding sleeves 42 are provided with insulation edge frames 43, the center of the optical fiber line 20 passes through the center of the insulation edge frame 43, and the side of the intermediate retaining frame 47 is provided with a docking plate 452, and the docking plate 452 is sleeved with the optical fiber line 20. A snap-fit ​​frame 45 is provided on the docking plate 452, a transfer tube 44 is provided between the snap-fit ​​frame 45 and the insulation tube 30, a hollow groove 450 is provided in the snap-fit ​​frame 45, the optical fiber line 20 is exposed in the hollow groove 450, and a grating detection point is provided in the optical fiber line 20 located in the hollow groove 450, an air guide hole 451 is provided on the side of the hollow groove 450, and a transfer hole 470 is arranged in a ring on the intermediate retaining frame 47, the air guide hole 451 is connected to the docking plate 452, and the snap-fit ​​frame 45 is connected to a rotation drive assembly.

[0029] Specifically, the optical fiber line 20 is supported and installed by the annular frame 41 and the intermediate retaining frame 47, and the folding sleeve 42 and the heat-insulating edge frame 43 are arranged on both sides of the annular frame 41 to form a closed space, so as to avoid the interference of the external environment on the high-temperature detection mechanism 4 during high-temperature detection, and to facilitate the constant maintenance of the temperature inside the high-temperature detection mechanism 4, so as to perform long-term detection. At the same time, in order to perform circumferential multi-point detection data measurement on the grating detection point, a snap-fit ​​frame 45 is arranged outside the grating detection point, and the snap-fit ​​frame 45 is driven to rotate outside the optical fiber line 20 by a rotating drive assembly, so that the high-temperature air transmitted by the transmission tube 44 enters the inside of the snap-fit ​​frame 45 and directly acts on the optical fiber line 20, and at the same time forms a circumferential rotation detection, so as to compare the consistency of the multi-directional detection data of the grating detection point.

[0030] Further, such as Figure 3 , Figure 5 As shown, the rotary drive assembly includes an annular matching frame 410 arranged on the side of the intermediate retaining frame 47, a matching slider 49 is slidably installed on the annular matching frame 410, a synchronization rod 48 is arranged between the matching slider 49 and the snap-fit ​​frame 45, a magnet block 411 is arranged on the matching slider 49, the magnet block 411 is fitted with the inner ring of the annular frame 41, an annular groove 4101 is arranged on the outer ring of the annular frame 41, an adsorption frame 4107 is slidably installed in the annular groove 4101, and the adsorption frame 4107 and the magnet block 411 are adsorbed on each other. , a snap-on annular groove 4103 and an outer gear ring 4102 are respectively provided on both sides of the annular slide groove 4101, an arc-shaped fitting frame 4104 is fitted on the edge of the annular frame 41, a motor 4105 is provided on the arc-shaped fitting frame 4104, the motor 4105 is connected with a gear 4106 and a matching pulley 4108, the gear 4106 and the outer gear ring 4102 are meshed with each other, the matching pulley 4108 is slidably installed between the snap-on annular groove 4103, and the adsorption frame 4107 is rotatably installed between the output shaft of the motor 4105.

[0031] Specifically, the motor 4105 drives the gear 4106 to rotate, and the pulley 4108 is combined to make the adsorption frame 4107 slide along the annular groove 4101. When the adsorption frame 4107 slides in the annular groove 4101, it will drive the magnet block 411 to slide synchronously. The magnet block 411 and the matching slider 49 and the synchronization rod 48 drive the snap-fit ​​frame 45 to rotate around the central axis of the intermediate retaining frame 47, and then drive the snap-fit ​​frame 45 to rotate circumferentially on the optical fiber line 20, so that the high-temperature airflow brought by the transfer tube 44 can act on the grating detection points at multiple points, thereby realizing all-round detection of the grating detection points.

[0032] It should be noted that the transfer tube 44 rotates 180 degrees clockwise on the outer surface of the optical fiber line 20 along with the snap-fit ​​frame 45 and then returns to the initial position, and then rotates 180 degrees counterclockwise, thereby carrying the snap-fit ​​frame 45 to allow the high-temperature airflow brought by the transfer tube 44 to act on the outer circle of the grating detection point on the optical fiber line 20, thereby achieving all-round detection and avoiding problems such as knotting and entanglement that may be caused by the continuous rotation of the transfer tube 44 along with the snap-fit ​​frame 45.

[0033] Further, such as Figure 6 , Figure 7 As shown, the twisting mechanism 5 includes a sliding card frame 50 arranged in the axial slide groove 10, and an arc frame 51 is fixedly arranged on the sliding card frame 50. The arc frame 51 is symmetrically arranged along the axial slide groove 10. An arc slide groove 52 is arranged in the arc frame 51, and a vertical connecting column 53 is slidably installed in the arc slide groove 52. The vertical connecting column 53 is connected to the high temperature detection mechanism 4, and a motor 2 54 is fixedly arranged on the vertical connecting column 53. The motor 2 54 is connected to the gear 2 55. The inner ring of the arc frame 51 is provided with an arc rack 56, and the gear 2 55 and the arc rack 56 are meshed with each other. A twisting direction control mechanism 6 is arranged between adjacent twisting mechanisms 5.

[0034] Specifically, motor 2 54 is used to control gear 2 55 to mesh with the arc-shaped rack 56, thereby driving the vertical connecting column 53 and the high-temperature detection mechanism 4 to move along the arc-shaped slide groove 52, thereby controlling the distortion of the optical fiber line 20 in the high-temperature detection mechanism 4, and observing the influence of creating a distorted environment during high-temperature detection on the accuracy of high-temperature detection data.

[0035] Further, such as Figure 8 As shown, the twisting direction control mechanism 6 includes a connecting flange 60 arranged on the side of the vertical connecting column 53, an extension plate 61 is rotatably installed on the connecting flange 60, and the end of the extension plate 61 is telescopically inserted with an intermediate plate 62, and a matching hole 67 is arranged in the middle part of the intermediate plate 62, and a mounting seat 65 is fixedly arranged in the axial slide groove 10, and a telescopic motor 66 is arranged on the mounting seat 65, and the telescopic motor 66 is connected with a matching rod, and the matching rod and the matching hole 67 cooperate with each other, and a control frame 63 is arranged at the connecting part of the extension plate 61 and the intermediate plate 62, and the control frame 63 is respectively slidably and telescopically installed between the extension plate 61 and the intermediate plate 62, and electromagnets 64 are evenly arranged on the control frame 63, and the extension plate 61 and the intermediate plate 62 are made of iron material.

[0036] Furthermore, the arc frames 51 of the adjacent twisting mechanisms 5 are arranged in the same direction, and the electromagnet 64 is powered off when the matching rod is matched with the matching hole 67, and is powered on when the matching rod is separated from the matching hole 67.

[0037] Specifically, the twisting direction can be twisted in the same direction or in the opposite direction, and the opposite twisting makes the optical fiber line 20 bend in an S shape. By setting the extension plate 61, the middle plate 62 and the control frame 63, when the matching rod is separated from the matching hole 67, the electromagnet 64 is energized, and the control frame 63 adsorbs the extension plate 61 and the middle plate 62, so that the extension plate 61 and the middle plate 62 cannot slide with the control plate to change the length. At this time, the motor 2 54 drives the gear 2 55 and the arc rack 56 to mesh with each other, and will drive the adjacent high temperature detection mechanism 4 to slide along the arc slot 52, so that the optical fiber line 20 is bent in the same direction. When the matching rod and the matching hole 67 are matched with each other, the electromagnet 64 is powered off, and the middle plate 62 will rotate around the matching rod. At this time, when the motor 2 54 drives the high temperature detection mechanism 4 on one side to slide along the arc slot 52, the high temperature detection mechanism 4 on the other end will rotate in the opposite direction, and at the same time, the extension plate 61 and the control frame 63 and the middle plate 62 slide with each other to adjust the overall length.

[0038] Further, such as Figure 3 , Figure 4 As shown, the annular matching frame 410 is provided with a groove, and the matching slider 49 is slidably engaged with the groove.

[0039] The working principle of the embodiment of the present invention is: like Figure 1-Figure 8As shown, the optical fiber line 20 is connected to the fiber grating analyzer through the optical connector 2 at the end, so as to measure and read the temperature data of the grating detection point in the optical fiber line 20. The optical fiber line 20 with the grating detection point is wrapped and set in the high-temperature detection mechanism 4, and the temperature adjustment detection is carried out in combination with the high-temperature heater 3. At the same time, the temperature is transferred to multiple high-temperature detection mechanisms 4 in combination with the flexible folding tube 31, and the temperature of multiple grating detection points on the optical fiber line 20 is detected. The grating point measurement data when the high temperature changes is compared with the set temperature data of the high-temperature heater 3, so as to judge the high-temperature detection accuracy of the fiber grating temperature sensor. At the same time, the high-temperature detection mechanism 4 of the remaining grating detection points is connected to the twisting mechanism 5, and the optical fiber line 20 is dynamically controlled to be twisted during the detection, so as to further detect the accuracy of the temperature detection when the external environment interferes with the optical fiber line 20. The optical fiber line 20 is supported and installed by the annular frame 41 and the intermediate retaining frame 47. At the same time, a folding sleeve 42 and a heat-insulating edge frame 43 are arranged on both sides of the annular frame 41 to form a closed space, so as to avoid interference of the external environment on the high-temperature detection mechanism 4 during high-temperature detection, and to facilitate constant maintenance of the temperature inside the high-temperature detection mechanism 4, so as to perform long-term detection. At the same time, in order to perform circumferential multi-point detection data measurement on the grating detection point, a snap-fit ​​frame 45 is arranged outside the grating detection point, and the snap-fit ​​frame 45 is driven by a rotary drive assembly to rotate outside the optical fiber line 20, so that the high-temperature air transmitted by the transmission tube 44 enters the inside of the snap-fit ​​frame 45 and directly acts on the optical fiber line 20, and at the same time forms a circumferential rotation detection, so as to compare the consistency of the multi-directional detection data of the grating detection point. The motor 1 4105 drives the gear 1 4106 to rotate, and the pulley 4108 is combined to make the adsorption frame 4107 slide along the annular groove 4101. When the adsorption frame 4107 slides in the annular groove 4101, it will drive the magnet block 411 to slide synchronously. The magnet block 411 and the matching slider 49 and the synchronization rod 48 drive the snap-fit ​​frame 45 to rotate around the central axis of the intermediate retaining frame 47, and then drive the snap-fit ​​frame 45 to rotate circumferentially on the optical fiber line 20, so that the high-temperature airflow brought by the transfer tube 44 can act on the grating detection points at multiple points, and realize the full-range detection of the grating detection points. Specifically, the motor 2 54 controls the gear 2 55 to mesh with the arc rack 56, and then drives the vertical connection column 53 and the high-temperature detection mechanism 4 to move along the arc groove 52, so as to control the distortion of the optical fiber line 20 in the high-temperature detection mechanism 4, and observe the influence of the distortion environment on the accuracy of the high-temperature detection data during high-temperature detection. The twisting direction can be the same twisting direction or the reverse twisting direction. The reverse twisting direction makes the optical fiber line 20 bend in an S shape.By setting the extension plate 61, the middle plate 62 and the control frame 63, when the matching rod and the matching hole 67 are separated, the electromagnet 64 is energized, and the control frame 63 adsorbs the extension plate 61 and the middle plate 62, so that the extension plate 61 and the middle plate 62 cannot slide with the control plate to change the length. At this time, the motor 2 54 drives the gear 2 55 and the arc-shaped rack 56 to mesh with each other, and will drive the adjacent high-temperature detection mechanism 4 to slide along the arc-shaped slide groove 52, so that the optical fiber line 20 is bent in the same direction. When the matching rod and the matching hole 67 are matched with each other, the electromagnet 64 is de-energized, and the middle plate 62 will rotate around the matching rod. At this time, when the motor 2 54 drives the high-temperature detection mechanism 4 on one side to slide along the arc-shaped slide groove 52, the high-temperature detection mechanism 4 on the other end will rotate in the opposite direction. At the same time, the extension plate 61 and the control frame 63 and the middle plate 62 slide with each other to adjust the overall length.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. Any reference numeral in a claim shall not be regarded as limiting the claim involved.

[0041] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A device for detecting high temperature resistance of a fiber Bragg grating temperature sensor, comprising a frame (1), an optical fiber line (20) being arranged on the frame (1), an optical connector (2) at the end of the optical fiber line (20) being fixedly mounted to one end of the frame (1), and the optical fiber line (20) being suspended and mounted on the upper side of the frame (1), characterized in that: A high temperature detection mechanism (4) is arranged outside the grating detection points arranged on the optical fiber line (20), and the high temperature detection mechanisms (4) are evenly arranged along the grating detection points of the optical fiber line (20). A high temperature heater (3) is fixedly arranged on the frame (1), and the high temperature heater (3) is connected to a heat preservation pipe (30). The high temperature heater (3) is connected to the high temperature detection mechanism (4) at the end of the optical fiber line (20) through the heat preservation pipe (30). A flexible folding pipe (31) is connected between adjacent high temperature heaters (3). The high temperature detection mechanism (4) at the end is fixedly installed with the frame (1). An axial slide groove (10) is arranged on the frame (1), and the remaining high temperature detection mechanisms (4) are slidably installed with the axial slide groove (10) and are connected with a twisting mechanism (5); The high temperature detection mechanism (4) comprises a mounting column (40), the mounting column (40) being connected to an annular frame (41), an inner ring of the annular frame (41) being provided with an intermediate retaining frame (47), the optical fiber line (20) passing through the center of the intermediate retaining frame (47), folding sleeves (42) being provided on both sides of the annular frame (41), an insulating edge frame (43) being provided at the end of the folding sleeve (42), the center of the optical fiber line (20) passing through the center of the insulating edge frame (43), a docking plate (452) being provided on the side of the intermediate retaining frame (47), the docking plate (452) being sleeved with the optical fiber line (20), and the A buckle frame (45) is provided on the docking plate (452), a transfer tube (44) is provided between the buckle frame (45) and the insulation tube (30), a hollow groove (450) is provided in the buckle frame (45), the optical fiber line (20) is exposed in the hollow groove (450), a grating detection point is provided in the optical fiber line (20) located in the hollow groove (450), an air guide hole (451) is provided on the side of the hollow groove (450), a transfer hole (470) is arranged in an annular shape on the intermediate retaining frame (47), the air guide hole (451) is communicated with the docking plate (452), and the buckle frame (45) is connected to a rotation drive assembly.

2. A fiber Bragg grating temperature sensor high temperature resistance detection device according to claim 1, characterized in that: The rotary drive assembly comprises an annular matching frame (410) arranged on the side of the intermediate retaining frame (47), a matching slider (49) being slidably mounted on the annular matching frame (410), a synchronization rod (48) being arranged between the matching slider (49) and the snap-fit ​​frame (45), a magnet block (411) being arranged on the matching slider (49), the magnet block (411) being fitted and mounted on the inner ring of the annular frame (41), an annular slide groove (4101) being arranged on the outer ring of the annular frame (41), an adsorption frame (4107) being slidably mounted in the annular slide groove (4101), the adsorption frame (4107) and the magnet block (411) being adsorbed on each other, A snap-fitting annular groove (4103) and an outer gear ring (4102) are respectively provided on both sides of the annular slide groove (4101); an arc-shaped fitting frame (4104) is fitted on the edge of the annular frame (41); a motor 1 (4105) is provided on the arc-shaped fitting frame (4104); the motor 1 (4105) is connected to a gear 1 (4106) and a matching pulley (4108); the gear 1 (4106) and the outer gear ring (4102) are meshed with each other; the matching pulley (4108) and the snap-fitting annular groove (4103) are slidably installed; and the adsorption frame (4107) is rotatably installed between the output shaft of the motor 1 (4105).

3. A fiber Bragg grating temperature sensor high temperature resistance detection device according to claim 1, characterized in that: The twisting mechanism (5) comprises a sliding card frame (50) arranged in the axial slide groove (10), an arc frame (51) is fixedly arranged on the sliding card frame (50), the arc frame (51) is symmetrically arranged along the axial slide groove (10), an arc slide groove (52) is arranged in the arc frame (51), a vertical connecting column (53) is slidably installed in the arc slide groove (52), the vertical connecting column (53) is connected to the high temperature detection mechanism (4), a motor 2 (54) is fixedly arranged on the vertical connecting column (53), the motor 2 (54) is connected to a gear 2 (55), an arc rack (56) is arranged on the inner ring of the arc frame (51), the gear 2 (55) and the arc rack (56) are meshed with each other, and a twisting direction control mechanism (6) is arranged between adjacent twisting mechanisms (5).

4. A fiber Bragg grating temperature sensor high temperature resistance detection device according to claim 3, characterized in that: The twisting direction control mechanism (6) comprises a connecting flange (60) arranged on the side of the vertical connecting column (53), an extension plate (61) is rotatably mounted on the connecting flange (60), an end of the extension plate (61) is telescopically plugged with an intermediate plate (62), a middle portion of the intermediate plate (62) is provided with a matching hole (67), a mounting seat (65) is fixedly arranged in the axial sliding groove (10), a telescopic motor (66) is arranged on the mounting seat (65), the telescopic motor (66) is connected to a matching rod, the matching rod and the matching hole (67) are matched with each other, a control frame (63) is arranged at the connection portion between the extension plate (61) and the intermediate plate (62), the control frame (63) is respectively slidably and telescopically mounted between the extension plate (61) and the intermediate plate (62), electromagnets (64) are evenly arranged on the control frame (63), and the extension plate (61) and the intermediate plate (62) are made of iron material.

5. A device for detecting high temperature resistance of a fiber Bragg grating temperature sensor according to claim 4, characterized in that: The arc-shaped frames (51) of the adjacent twisting mechanisms (5) are arranged in the same direction, and the electromagnet (64) is powered off when the matching rod is matched with the matching hole (67), and is powered on when the matching rod is separated from the matching hole (67).

6. A device for detecting high temperature resistance of a fiber Bragg grating temperature sensor according to claim 2, characterized in that: The annular matching frame (410) is provided with a groove, and the matching sliding block (49) is slidably engaged with the groove.

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