Optical fiber sensor calibration tool suite

Abstract

An optical fiber sensor calibration tool suite belongs to the technical field of optical fiber sensor calibration and comprises a curvature-torsion rate calibration unit body, a torsion rate calibration unit body and an optical fiber sensor nondestructive clamp. The curvature-torsion calibration unit body and the optical fiber sensor nondestructive clamp are used in a matched mode to form the curvature-torsion calibration tool for the optical fiber sensor. The torsion rate calibration unit body is matched with the optical fiber sensor lossless clamp to form the optical fiber sensor torsion rate calibration tool; the curvature-torsion rate calibration unit body and the torsion rate calibration unit body are of an assembled combined structure. According to the optical fiber sensor calibration tool suite, continuous calibration testing under any curvature and screw pitch can be achieved, the clamping mode of the optical fiber sensor is optimized, introduction of axial tensile stress can be avoided during curvature calibration testing and torsion rate calibration testing, and the problems of local stress concentration, optical fiber sensor damage and the like can be avoided during torsion rate calibration testing; meanwhile, the stability, reliability and accuracy of continuous application of the torsional moment can be ensured.

Description

Technical Field

[0001] This invention belongs to the field of fiber optic sensor calibration technology, and in particular relates to a fiber optic sensor calibration kit. Background Technology

[0002] In order to establish an accurate mapping relationship between the multi-channel strain signal of the fiber optic sensor and curvature, deflection, and torsion, and to verify whether the measurement accuracy deviation and performance verification of the fiber optic sensor meet the design requirements, the fiber optic sensor needs to be calibrated before leaving the factory.

[0003] Currently, when calibrating the curvature of fiber optic sensors, the traditional method usually requires preparing multiple cylinders of fixed diameter, each with a fixed curvature. The fiber optic sensor to be calibrated is then wound around the selected cylinders to perform curvature calibration tests on the fiber optic sensor under a fixed curvature.

[0004] When calibrating the deflection of fiber optic sensors, the traditional method usually requires preparing multiple sets of cylinders with fixed diameters. Each cylinder has a fixed curvature and a helical groove with a fixed pitch on its surface. The fiber optic sensor to be calibrated is then wound around the selected cylinder along the helical groove with the fixed pitch, thereby performing a deflection calibration test on the fiber optic sensor under fixed curvature and fixed pitch.

[0005] When calibrating the torsion rate of fiber optic sensors, the traditional method is to use a rigid clamp to hold one end of the fiber optic sensor in place, while the other end of the fiber optic sensor is manually subjected to a torsional torque, thereby performing the torsion rate calibration test during the torsion process of the fiber optic sensor.

[0006] However, traditional curvature and deflection calibration methods are limited by the fixed diameter of the cylinder, and traditional deflection calibration methods are also limited by the fixed pitch of the helical groove. Calibration tests can only be carried out under limited curvature and pitch values, and continuous calibration tests under arbitrary curvature and pitch cannot be achieved. To expand the applicability of curvature and deflection calibration tests, the number of cylinders with different diameters and different helical groove pitches must be increased, which leads to a significant increase in the cost of curvature and deflection calibration tests.

[0007] In addition, under traditional curvature calibration and deflection calibration methods, in order to enable the fiber optic sensor to be accurately wound and fitted to the cylindrical surface, axial tensile stress is inevitably introduced, which will interfere with the accuracy of curvature calibration and deflection calibration.

[0008] Traditional torsion rate calibration methods are limited by rigid clamps and manual application of torsional torque. Existing rigid clamps typically only consider the clamping stability of the fiber optic sensor, without fully considering issues such as localized stress concentration and damage to the fiber optic sensor that can easily occur during clamping and fixing. Furthermore, manually applying torsional torque cannot guarantee continuous stability, reliability, and accuracy, making it difficult to accurately guarantee the torsion rate calibration test accuracy. Therefore, traditional fiber optic sensor calibration technology can no longer meet practical needs. Summary of the Invention

[0009] To address the problems existing in the prior art, this invention provides a fiber optic sensor calibration kit that enables continuous calibration testing under arbitrary curvature and pitch. It optimizes the clamping method of the fiber optic sensor, avoids the introduction of axial tensile stress during curvature and deflection calibration tests, and avoids problems such as local stress concentration and damage to the fiber optic sensor during torsion calibration tests. At the same time, it can ensure the stability, reliability and accuracy of continuous application of torsional torque.

[0010] To achieve the above objectives, the present invention adopts the following technical solution: a fiber optic sensor calibration fixture kit, comprising a curvature-torsion calibration unit, a torsion calibration unit, and a fiber optic sensor non-destructive fixture; the curvature-torsion calibration unit and the fiber optic sensor non-destructive fixture are used together to form a fiber optic sensor curvature-torsion calibration fixture; the torsion calibration unit and the fiber optic sensor non-destructive fixture are used together to form a fiber optic sensor torsion calibration fixture.

[0011] The curvature-deflection calibration unit adopts a modular structure, including a spoke-type support base, a spoke-type support top, a support column, and an adjustable vertical rail. The spoke-type support base is horizontally positioned; the support column is vertically positioned, with its bottom fixedly connected to the center of the spoke-type support base; the spoke-type support top is horizontally positioned, with its center fixedly connected to the top of the support column; each spoke support rod of the spoke-type support base and the spoke-type support top is equipped with a radial slide rail, with the radial slide rail of the spoke-type support base facing upwards, and the radial slide rail of the spoke-type support top... The radial slide rails face downwards; there are several adjustable vertical rails, which are evenly distributed along the circumference of the support column. Each adjustable vertical rail has a radial slider fixed at both its upper and lower ends, and a positioning fastening screw is installed on the radial slider; the radial slider at the upper end of the adjustable vertical rail is located in the radial slide rail of the spoke-type support top seat, and the radial slider at the lower end of the adjustable vertical rail is located in the radial slide rail of the spoke-type support base; each adjustable vertical rail is equipped with a fiber optic sensor non-destructive fixture, and a vertical slider is installed in each adjustable vertical rail, with a positioning fastening screw installed on the vertical slider.

[0012] The spoke-type support base and the spoke-type support top have the same structure, both adopting a double-lobed splicing structure. Each lobe has a positioning protrusion and a positioning groove arranged side by side on the mating surface. When the two lobes are mated, the positioning protrusion and the positioning groove are inserted and matched, and the two lobes are fastened together by bolts.

[0013] The torsion rate calibration unit adopts an assembled structure, including a left slide rail support base, a right slide rail support base, a front torsion actuation drive assembly, a rear torsion actuation drive assembly, a front guide limit assembly, and a rear guide limit assembly. The slide rail support base and the right slide rail support base have the same structure, both adopting a linear slide rail configuration. The slide rail support base and the right slide rail support base are distributed in parallel. The front torsion actuation drive assembly and the front guide limit assembly are located at the front end of the slide rail support base and the right slide rail support base. The rear torsion actuation drive assembly and the rear guide limit assembly are located at the rear end of the slide rail support base and the right slide rail support base.

[0014] The front and rear torsional drive assemblies have identical structures, each including a left driven support gear, a right driven support gear, a semi-circular ring gear, a drive gear, a torsional drive motor, a left driven gear support, a right driven gear support, and a motor support. The left driven support gear is mounted on the left driven gear support, and a left translation slider is fixedly connected to the bottom of the left driven gear support. The left translation slider is located within a linear groove of the left slide rail support base, and positioning screws are fitted on the left slide rail support base and the left translation slider. The right driven support gear is mounted on the right... On the driven gear support, a right translation slider is fixedly connected to the bottom of the right driven gear support. The right translation slider is located in the straight groove of the right slide rail support base. Positioning and fastening screws are installed on the right slide rail support base and the right translation slider. The semi-circular ring gear meshes with both the left and right driven support gears, with the concave surface of the semi-circular ring gear facing upward. The torsion drive motor is horizontally fixed to the side of the left slide rail support base via a motor support. The drive gear is fixedly installed on the motor shaft of the torsion drive motor and meshes with the right driven support gear.

[0015] A left clamping plate is provided on the top surface of the left end of the semicircular ring gear, and a right clamping plate is provided on the top surface of the right end of the semicircular ring gear. Clamping screws are installed on both the left and right clamping plates.

[0016] The front and rear guide limiting components have identical structures, each including a guide limiting support base, a front height-adjusting guide rod, a rear height-adjusting guide rod, a front height-adjusting adapter block, a rear height-adjusting adapter block, a limiting crossbar, and a limiting roller. The front and rear height-adjusting guide rods are vertically fixed side-by-side above the guide limiting support base. The front height-adjusting adapter block is fitted onto the front height-adjusting guide rod and is equipped with a positioning fastening screw. The rear height-adjusting adapter block is fitted onto the rear height-adjusting guide rod and is equipped with a positioning fastening screw. The limiting crossbar is fixedly connected between the front and rear height-adjusting adapter blocks. The limiting roller is fitted into the middle of the limiting crossbar, and the limiting roller makes rolling contact with the concave surface of the semi-circular ring gear.

[0017] The fiber optic sensor non-destructive fixture includes a left clamping wheel, a right clamping wheel, a left clamping wheel support, a right clamping wheel support, a left upper adjustment adapter block, a left lower adjustment adapter block, a right upper adjustment adapter block, a right lower adjustment adapter block, an upper adjustment forward and reverse threaded rod, and a lower adjustment forward and reverse threaded rod. The left clamping wheel is rotatably connected inside the left clamping wheel support. The left upper adjustment adapter block is fixedly installed on the upper part of the left clamping wheel support. The left lower adjustment adapter block is fixedly installed on the lower part of the left clamping wheel support. The right clamping wheel is rotatably connected inside the right clamping wheel support. The right upper adjustment adapter block is fixedly installed on the upper part of the right clamping wheel support. The lower right adjustment adapter block is fixedly installed on the lower part of the right clamping wheel support; the upper adjustment positive and negative threaded rod is threaded between the upper left adjustment adapter block and the upper right adjustment adapter block, and positioning fastening screws are installed on both the upper left and upper right adjustment adapter blocks; the lower adjustment positive and negative threaded rod is distributed parallel to the upper adjustment positive and negative threaded rod, and is threaded between the lower left and lower right adjustment adapter blocks, and positioning fastening screws are installed on both the lower left and lower right adjustment adapter blocks; a passage gap for the fiber optic sensor is left between the left clamping wheel and the right clamping wheel.

[0018] The fiber optic sensor non-destructive fixture is equipped with an adapter threaded rod. When the fiber optic sensor non-destructive fixture is used in conjunction with the curvature-torsion calibration unit, each fiber optic sensor non-destructive fixture is equipped with one adapter threaded rod. One end of the adapter threaded rod is fixedly connected to the left or right clamping wheel support, and the other end of the adapter threaded rod is fixedly connected to the vertical slider. When the fiber optic sensor non-destructive fixture is used in conjunction with the torsion rate calibration unit, each fiber optic sensor non-destructive fixture is equipped with two adapter threaded rods. One adapter threaded rod is connected to each of the left and right clamping wheel supports. The adapter threaded rod on the left clamping wheel support is fixedly connected to the top left end of the semi-circular ring gear through the left clamping plate, and the adapter threaded rod on the right clamping wheel support is fixedly connected to the top right end of the semi-circular ring gear through the right clamping plate.

[0019] The curvature-torsion calibration unit, the torsion calibration unit, and the fiber optic sensor non-destructive fixture are equipped with a tool storage box, which has several storage slots. The components of the decomposed curvature-torsion calibration unit, the components of the decomposed torsion calibration unit of different sizes, and the fiber optic sensor non-destructive fixture of different sizes are all placed in the tool storage box through the storage slots.

[0020] The beneficial effects of this invention are: The fiber optic sensor calibration kit of the present invention can realize continuous calibration testing under arbitrary curvature and arbitrary pitch, optimize the clamping method of fiber optic sensors, avoid the introduction of axial tensile stress during curvature calibration testing and deflection calibration testing, and avoid problems such as local stress concentration and fiber optic sensor damage during torsion calibration testing. At the same time, it can ensure the stability, reliability and accuracy of continuous application of torsional torque. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the curvature calibration of the fiber optic sensor curvature-torsion calibration tool of the present invention when zero torsion is performed. Figure 2 This is a schematic diagram of the fiber optic sensor curvature-torsion calibration tool of the present invention for torsion calibration under a set curvature. Figure 3 This is a schematic diagram of the curvature-torsion calibration unit of the present invention; Figure 4 This is a schematic diagram of the initial state of the fiber optic sensor torsion rate calibration tool of the present invention before torsion rate calibration; Figure 5 for Figure 4 A partial schematic diagram; Figure 6 This is a schematic diagram illustrating the torsion rate calibration of the fiber optic sensor using the present invention. Figure 7 for Figure 6 A partial schematic diagram; Figure 8 This is a schematic diagram of the torsion rate calibration unit of the present invention; Figure 9 This is a schematic diagram of the non-destructive fixture for the fiber optic sensor of the present invention; Figure 10 This is a schematic diagram of the fiber optic sensor non-destructive fixture of the present invention connected to the vertical slider via an adapter threaded rod; Figure 11 This is a schematic diagram of the assembly structure of the semi-circular ring gear, the left clamping plate and the right clamping plate of the present invention; Figure 12 This is a schematic diagram of the assembly structure of the drive gear, torsion drive motor and motor support of the present invention; Figure 13 This is a schematic diagram of the front / rear guide and limiting assembly of the present invention; Figure 14 This is a schematic diagram of the fiber optic sensor calibration kit of the present invention placed in a tool storage box in a disassembled state; Figure 15 This is a schematic diagram of the tool storage box of the present invention; In the diagram, 1—spoke-type support base, 2—spoke-type support top seat, 3—support column, 4—adjustable vertical rail, 5—radial slide rail, 6—radial slider, 7—vertical slider, 8—left slide rail type support base, 9—right slide rail type support base, 10—left driven support gear, 11—right driven support gear, 12—semi-circular ring gear, 13—drive gear, 14—torsion drive motor, 15—left driven gear support, 16—right driven gear support, 17—motor support, 18—left translation slider, 19—right translation slider, 20—guide limit support base, 21—front height adjustment guide rod, 22—rear height adjustment guide rod, 23—front height adjustment adapter block, 24—rear height adjustment... Adapter block, 25—Limiting crossbar, 26—Limiting roller, 27—Left clamping wheel, 28—Right clamping wheel, 29—Left clamping wheel support, 30—Right clamping wheel support, 31—Left upper adjustment adapter block, 32—Left lower adjustment adapter block, 33—Right upper adjustment adapter block, 34—Right lower adjustment adapter block, 35—Upper adjustment forward and reverse threaded rod, 36—Lower adjustment forward and reverse threaded rod, 37—Fiber optic sensor, 38—Adapter threaded rod, 39—Left clamping plate, 40—Right clamping plate, 41—Tool storage box, 42—Fiber optic sensor non-destructive fixture, 43—Front torsional actuator drive assembly, 44—Rear torsional actuator drive assembly, 45—Front guide limit assembly, 46—Rear guide limit assembly. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0023] like Figures 1-15 As shown, a fiber optic sensor calibration kit includes a curvature-torsion calibration unit, a torsion calibration unit, and a fiber optic sensor non-destructive fixture 42; the curvature-torsion calibration unit and the fiber optic sensor non-destructive fixture 42 are used together to form a fiber optic sensor curvature-torsion calibration kit; the torsion calibration unit and the fiber optic sensor non-destructive fixture 42 are used together to form a fiber optic sensor torsion calibration kit.

[0024] The curvature-deflection calibration unit adopts an assembled structure, including a spoke-type support base 1, a spoke-type support top seat 2, a support column 3, and an adjustable vertical rail 4. The spoke-type support base 1 is horizontally positioned; the support column 3 is vertically positioned, with its bottom end fixedly connected to the center of the spoke-type support base 1; the spoke-type support top seat 2 is horizontally positioned, with its center fixedly connected to the top of the support column 3; each spoke support rod of the spoke-type support base 1 and the spoke-type support top seat 2 is equipped with a radial slide rail 5, with the radial slide rail 5 of the spoke-type support base 1 facing upwards and the radial slide rail 5 of the spoke-type support top seat 2 facing upwards. The slide rail 5 faces downwards; there are several adjustable vertical rails 4, which are evenly distributed along the circumference of the support column 3. Each adjustable vertical rail 4 has a radial slider 6 fixedly installed at both its upper and lower ends, and a positioning fastening screw is installed on the radial slider 6; the radial slider 6 at the upper end of the adjustable vertical rail 4 is located in the radial slide rail 5 of the spoke-type support top seat 2, and the radial slider 6 at the lower end of the adjustable vertical rail 4 is located in the radial slide rail 5 of the spoke-type support base 1; each adjustable vertical rail 4 is equipped with a fiber optic sensor non-destructive fixture 42, and a vertical slider 7 is installed in each adjustable vertical rail 4, and a positioning fastening screw is installed on the vertical slider 7.

[0025] The spoke-type support base 1 and the spoke-type support top 2 have the same structure, both adopting a double-lobed splicing structure. Each lobe has a positioning protrusion and a positioning groove arranged side by side on the mating surface. When the two lobes are mated, the positioning protrusion and the positioning groove are inserted and matched, and the two lobes are fastened together by bolts.

[0026] The torsion rate calibration unit adopts an assembled structure, including a left slide rail support base 8, a right slide rail support base 9, a front torsion actuation drive assembly 43, a rear torsion actuation drive assembly 44, a front guide limit assembly 45, and a rear guide limit assembly 46. The slide rail support base 8 and the right slide rail support base 9 have the same structure, both adopting a linear slide rail configuration. The slide rail support base 8 and the right slide rail support base 9 are distributed in parallel. The front torsion actuation drive assembly 43 and the front guide limit assembly 45 are located at the front end of the slide rail support base 8 and the right slide rail support base 9. The rear torsion actuation drive assembly 44 and the rear guide limit assembly 46 are located at the rear end of the slide rail support base 8 and the right slide rail support base 9.

[0027] The front torsional drive assembly 43 and the rear torsional drive assembly 44 have the same structure, both including a left driven support gear 10, a right driven support gear 11, a semi-circular ring gear 12, a drive gear 13, a torsional drive motor 14, a left driven gear support 15, a right driven gear support 16, and a motor support 17; the left driven support gear 10 is mounted on the left driven gear support 15, and a left translation slider 18 is fixedly connected to the bottom of the left driven gear support 15. The left translation slider 18 is located in the linear groove of the left slide rail support base 8, and positioning fastening screws are installed on the left slide rail support base 8 and the left translation slider 18; the right driven support gear 11 is mounted on... On the right driven gear support 16, a right translation slider 19 is fixedly connected to the bottom of the right driven gear support 16. The right translation slider 19 is located in the straight groove of the right slide rail support base 9. Positioning and fastening screws are installed on the right slide rail support base 9 and the right translation slider 19. The semi-circular ring gear 12 meshes with both the left driven support gear 10 and the right driven support gear 11, and the concave surface of the semi-circular ring gear 12 faces upward. The torsion drive motor 14 is horizontally fixed to the side of the left slide rail support base 8 through the motor support 17. The driving gear 13 is fixedly installed on the motor shaft of the torsion drive motor 14, and the driving gear 13 meshes with the right driven support gear 11.

[0028] A left clamping plate 39 is provided on the top surface of the left end of the semicircular ring gear 12, and a right clamping plate 40 is provided on the top surface of the right end of the semicircular ring gear 12. Clamping screws are installed on both the left clamping plate 39 and the right clamping plate 40.

[0029] The front guide limiting assembly 45 and the rear guide limiting assembly 46 have the same structure, both including a guide limiting support base 20, a front height adjustment guide rod 21, a rear height adjustment guide rod 22, a front height adjustment adapter block 23, a rear height adjustment adapter block 24, a limiting crossbar 25, and a limiting roller 26; the front height adjustment guide rod 21 and the rear height adjustment guide rod 22 are vertically fixed side by side above the guide limiting support base 20; the front height adjustment adapter block 23 is fitted onto the front height adjustment... On the guide post 21, a positioning and fastening screw is installed on the front height adjustment adapter block 23; the rear height adjustment adapter block 24 is fitted on the rear height adjustment guide post 22, and a positioning and fastening screw is installed on the rear height adjustment adapter block 24; the limiting crossbar 25 is fixedly connected between the front height adjustment adapter block 23 and the rear height adjustment adapter block 24; the limiting roller 26 is fitted on the middle of the limiting crossbar 25, and the limiting roller 26 makes rolling contact with the concave surface of the semi-circular ring gear 12.

[0030] The fiber optic sensor non-destructive fixture 42 includes a left clamping wheel 27, a right clamping wheel 28, a left clamping wheel support 29, a right clamping wheel support 30, an upper left adjustment adapter block 31, a lower left adjustment adapter block 32, an upper right adjustment adapter block 33, a lower right adjustment adapter block 34, an upper adjustment forward and reverse threaded rod 35, and a lower adjustment forward and reverse threaded rod 36. The left clamping wheel 27 is rotatably connected to the left clamping wheel support 29. The upper left adjustment adapter block 31 is fixedly installed on the upper part of the left clamping wheel support 29. The lower left adjustment adapter block 32 is fixedly installed on the lower part of the left clamping wheel support 29. The right clamping wheel 28 is rotatably connected to the right clamping wheel support 30. The upper right adjustment adapter block 33 is fixedly installed on the right clamping wheel support 30. 0. Upper part; the lower right adjustment adapter block 34 is fixedly installed on the lower part of the right clamping wheel support 30; the upper adjustment positive and negative threaded rod 35 is threaded between the upper left adjustment adapter block 31 and the upper right adjustment adapter block 33, and positioning fastening screws are installed on both the upper left adjustment adapter block 31 and the upper right adjustment adapter block 33; the lower adjustment positive and negative threaded rod 36 is distributed parallel to the upper adjustment positive and negative threaded rod 35, and the lower adjustment positive and negative threaded rod 36 is threaded between the lower left adjustment adapter block 32 and the lower right adjustment adapter block 34, and positioning fastening screws are installed on both the lower left adjustment adapter block 32 and the lower right adjustment adapter block 34; a passage gap for the fiber optic sensor 37 is left between the left clamping wheel 27 and the right clamping wheel 28.

[0031] The fiber optic sensor non-destructive fixture 42 is equipped with an adapter threaded rod 38. When the fiber optic sensor non-destructive fixture 42 is used in conjunction with the curvature-torsion calibration unit, each fiber optic sensor non-destructive fixture 42 is equipped with one adapter threaded rod 38. One end of the adapter threaded rod 38 is fixedly connected to the left clamping wheel support 29 or the right clamping wheel support 30, and the other end of the adapter threaded rod 38 is fixedly connected to the vertical slider 7. When the fiber optic sensor non-destructive fixture 42 is used in conjunction with the torsion calibration unit, the adapter threaded rod 38 is fixedly connected to the left clamping wheel support 29 or the right clamping wheel support 30. When the fixed unit is used together, each fiber optic sensor non-destructive fixture 42 is equipped with two adapter threaded rods 38. One adapter threaded rod 38 is connected to each of the left clamping wheel support 29 and the right clamping wheel support 30. The adapter threaded rod 38 on the left clamping wheel support 29 is fixedly connected to the top left end of the semi-circular ring gear 12 through the left clamping plate 39, and the adapter threaded rod 38 on the right clamping wheel support 30 is fixedly connected to the top right end of the semi-circular ring gear 12 through the right clamping plate 40.

[0032] The curvature-torsion calibration unit, the torsion calibration unit, and the fiber optic sensor non-destructive fixture 42 are equipped with a tool storage box 41, which has several storage slots. The components of the decomposed curvature-torsion calibration unit, the components of the decomposed torsion calibration unit of different sizes, and the fiber optic sensor non-destructive fixtures of different sizes are all placed in the tool storage box 41 through the storage slots.

[0033] The following description, in conjunction with the accompanying drawings, illustrates the usage of this invention: In this embodiment, the spoke-type support base 1 and spoke-type support top 2 of the curvature-deflection calibration unit have twelve spoke support rods, and the number of matching adjustable vertical rails 4 is also twelve.

[0034] When it is necessary to perform curvature-torsion calibration of fiber optic sensor 37, first take out the components of curvature-torsion calibration unit from tool storage box 41, then assemble the components into curvature-torsion calibration unit outside tool storage box 41, and then adjust the radial position of the twelve adjustable vertical rails 4 until all the adjustable vertical rails 4 are at the set point.

[0035] After the vertical rail 4 is adjusted, take out the twelve fiber optic sensor non-destructive fixtures 42 that are compatible with the fiber optic sensor 37 from the tool storage box 41, and then fix the twelve fiber optic sensor non-destructive fixtures 42 onto the vertical sliders 7 in the twelve vertical rails 4 in sequence.

[0036] If the fiber optic sensor 37 needs to be calibrated for curvature at zero deflection, the twelve fiber optic sensor non-destructive fixtures 42 are positioned on the same horizontal plane. The fiber optic sensor 37 is then passed sequentially through the twelve fixtures 42. At this point, the fiber optic sensor 37 is in a completely bent state with zero deflection. Subsequently, curvature calibration tests can be performed on the fiber optic sensor 37 at a set curvature. Afterward, by simply changing the radial position of the twelve adjustable vertical rails 4, without disassembling the fiber optic sensor non-destructive fixtures 42 and the fiber optic sensor 37, the curvature of the fiber optic sensor 37 in a purely bent state can be quickly changed, thus achieving curvature calibration tests at any curvature.

[0037] If the fiber optic sensor 37 needs to be calibrated for deflection at a set curvature, the twelve fiber optic sensor non-destructive fixtures 42 are positioned on different horizontal planes with equal height differences. The fiber optic sensor 37 is then passed sequentially through the twelve fixtures 42. At this point, the fiber optic sensor 37 is in a spiral-wound state with the set deflection. Deflection calibration testing can then be performed on the fiber optic sensor 37 at the set deflection. Subsequently, by simply changing the radial position of the twelve adjustable vertical rails 4, without disassembling the fiber optic sensor non-destructive fixtures 42 and the fiber optic sensor 37, the curvature of the fiber optic sensor 37 in the spiral-wound state can be quickly changed, thus achieving deflection calibration testing at any curvature. Alternatively, by simply changing the height difference of the twelve fiber optic sensor non-destructive fixtures 42, without disassembling the fiber optic sensor non-destructive fixtures 42 and the fiber optic sensor 37, the pitch of the fiber optic sensor 37 in the spiral-wound state can be quickly changed, thus achieving deflection calibration testing at any pitch.

[0038] When calibrating the torsion rate of the fiber optic sensor 37, firstly, remove the components of the torsion rate calibration unit from the tool storage box 41. Then, assemble the components into the torsion rate calibration unit outside the tool storage box 41. Next, adjust the spacing between the front torsion actuation drive assembly 43 and the rear torsion actuation drive assembly 44 to accommodate the length of the fiber optic sensor 37. Afterward, remove two fiber optic sensor non-destructive fixtures 42 adapted to the fiber optic sensor 37 from the tool storage box 41, and then fix the two fiber optic sensor non-destructive fixtures 42 onto the semi-circular ring gears 12 of the front torsion actuation drive assembly 43 and the rear torsion actuation drive assembly 44, respectively.

[0039] After the two fiber optic sensor non-destructive fixtures 42 are installed and fixed, the fiber optic sensor 37 is passed through the two fiber optic sensor non-destructive fixtures 42 in sequence. Then, the upper adjustment threaded rod 35 and the lower adjustment threaded rod 36 on the fiber optic sensor non-destructive fixture 42 are screwed on to bring the left clamping wheel 27 and the right clamping wheel 28 closer to each other until the fiber optic sensor 37 is clamped between the left clamping wheel 27 and the right clamping wheel 28. At this time, the fiber optic sensor 37 only has axial movement freedom relative to the left clamping wheel 27 and the right clamping wheel 28. The clamping surfaces of the fiber optic sensor 37 and the left clamping wheel 27 and the right clamping wheel 28 are only in rolling friction fit. The fiber optic sensor 37 cannot have sliding friction relative movement with the clamping surfaces of the left clamping wheel 27 and the right clamping wheel 28 in the rotation direction.

[0040] After the fiber optic sensor 37 is clamped and fixed, the torsion drive motors 14 in the front torsion drive assembly 43 and the rear torsion drive assembly 44 are started synchronously. The two torsion drive motors 14 rotate in opposite directions, which in turn drives the two front and rear drive gears 13 to rotate in opposite directions, thereby driving the two front and rear semi-circular ring gears 12 to rotate in opposite directions. Finally, the two front and rear fiber optic sensor non-destructive fixtures 42 rotate in opposite directions, realizing the torsion of the fiber optic sensor 37. Then, the torsion rate calibration test of the fiber optic sensor 37 can be performed at a set torsion rate. Subsequently, by simply changing the rotation angle of the two front and rear torsion drive motors 14 synchronously, without disassembling the fiber optic sensor non-destructive fixtures 42 and the fiber optic sensor 37, the calibration test of the fiber optic sensor 37 at any torsion rate can be quickly achieved.

[0041] The solutions in the embodiments are not intended to limit the scope of protection of the present invention. All equivalent implementations or modifications that do not depart from the present invention are included in the scope of protection of the present invention.

Claims

1. A fiber optic sensor calibration kit, characterized in that: It includes a curvature-deflection calibration unit, a torsion calibration unit, and a fiber optic sensor non-destructive fixture; the curvature-deflection calibration unit and the fiber optic sensor non-destructive fixture are used together to form a fiber optic sensor curvature-deflection calibration fixture; the torsion calibration unit and the fiber optic sensor non-destructive fixture are used together to form a fiber optic sensor torsion calibration fixture.

2. The fiber optic sensor calibration kit according to claim 1, characterized in that: The curvature-deflection calibration unit adopts a modular structure, including a spoke-type support base, a spoke-type support top, a support column, and an adjustable vertical rail. The spoke-type support base is horizontally positioned; the support column is vertically positioned, with its bottom fixedly connected to the center of the spoke-type support base; the spoke-type support top is horizontally positioned, with its center fixedly connected to the top of the support column; each spoke support rod of the spoke-type support base and the spoke-type support top is equipped with a radial slide rail, with the radial slide rail of the spoke-type support base facing upwards, and the radial slide rail of the spoke-type support top... The radial slide rails face downwards; there are several adjustable vertical rails, which are evenly distributed along the circumference of the support column. Each adjustable vertical rail has a radial slider fixed at both its upper and lower ends, and a positioning fastening screw is installed on the radial slider; the radial slider at the upper end of the adjustable vertical rail is located in the radial slide rail of the spoke-type support top seat, and the radial slider at the lower end of the adjustable vertical rail is located in the radial slide rail of the spoke-type support base; each adjustable vertical rail is equipped with a fiber optic sensor non-destructive fixture, and a vertical slider is installed in each adjustable vertical rail, with a positioning fastening screw installed on the vertical slider.

3. The fiber optic sensor calibration kit according to claim 2, characterized in that: The spoke-type support base and the spoke-type support top have the same structure, both adopting a double-lobed splicing structure. Each lobe has a positioning protrusion and a positioning groove arranged side by side on the mating surface. When the two lobes are mated, the positioning protrusion and the positioning groove are inserted and matched, and the two lobes are fastened together by bolts.

4. The fiber optic sensor calibration kit according to claim 1, characterized in that: The torsion rate calibration unit adopts an assembled structure, including a left slide rail support base, a right slide rail support base, a front torsion actuation drive assembly, a rear torsion actuation drive assembly, a front guide limit assembly, and a rear guide limit assembly. The slide rail support base and the right slide rail support base have the same structure, both adopting a linear slide rail configuration. The slide rail support base and the right slide rail support base are distributed in parallel. The front torsion actuation drive assembly and the front guide limit assembly are located at the front end of the slide rail support base and the right slide rail support base. The rear torsion actuation drive assembly and the rear guide limit assembly are located at the rear end of the slide rail support base and the right slide rail support base.

5. The fiber optic sensor calibration kit according to claim 4, characterized in that: The front and rear torsional drive assemblies have identical structures, each including a left driven support gear, a right driven support gear, a semi-circular ring gear, a drive gear, a torsional drive motor, a left driven gear support, a right driven gear support, and a motor support. The left driven support gear is mounted on the left driven gear support, and a left translation slider is fixedly connected to the bottom of the left driven gear support. The left translation slider is located within a linear groove of the left slide rail support base, and positioning screws are fitted on the left slide rail support base and the left translation slider. The right driven support gear is mounted on the right... On the driven gear support, a right translation slider is fixedly connected to the bottom of the right driven gear support. The right translation slider is located in the straight groove of the right slide rail support base. Positioning and fastening screws are installed on the right slide rail support base and the right translation slider. The semi-circular ring gear meshes with both the left and right driven support gears, with the concave surface of the semi-circular ring gear facing upward. The torsion drive motor is horizontally fixed to the side of the left slide rail support base via a motor support. The drive gear is fixedly installed on the motor shaft of the torsion drive motor and meshes with the right driven support gear.

6. The fiber optic sensor calibration kit according to claim 5, characterized in that: A left clamping plate is provided on the top surface of the left end of the semicircular ring gear, and a right clamping plate is provided on the top surface of the right end of the semicircular ring gear. Clamping screws are installed on both the left and right clamping plates.

7. The fiber optic sensor calibration kit according to claim 5, characterized in that: The front and rear guide limiting components have identical structures, each including a guide limiting support base, a front height-adjusting guide rod, a rear height-adjusting guide rod, a front height-adjusting adapter block, a rear height-adjusting adapter block, a limiting crossbar, and a limiting roller. The front and rear height-adjusting guide rods are vertically fixed side-by-side above the guide limiting support base. The front height-adjusting adapter block is fitted onto the front height-adjusting guide rod and is equipped with a positioning fastening screw. The rear height-adjusting adapter block is fitted onto the rear height-adjusting guide rod and is equipped with a positioning fastening screw. The limiting crossbar is fixedly connected between the front and rear height-adjusting adapter blocks. The limiting roller is fitted into the middle of the limiting crossbar, and the limiting roller makes rolling contact with the concave surface of the semi-circular ring gear.

8. The fiber optic sensor calibration kit according to claim 5, characterized in that: The fiber optic sensor non-destructive fixture includes a left clamping wheel, a right clamping wheel, a left clamping wheel support, a right clamping wheel support, a left upper adjustment adapter block, a left lower adjustment adapter block, a right upper adjustment adapter block, a right lower adjustment adapter block, an upper adjustment forward and reverse threaded rod, and a lower adjustment forward and reverse threaded rod. The left clamping wheel is rotatably connected inside the left clamping wheel support. The left upper adjustment adapter block is fixedly installed on the upper part of the left clamping wheel support. The left lower adjustment adapter block is fixedly installed on the lower part of the left clamping wheel support. The right clamping wheel is rotatably connected inside the right clamping wheel support. The right upper adjustment adapter block is fixedly installed on the upper part of the right clamping wheel support. The lower right adjustment adapter block is fixedly installed on the lower part of the right clamping wheel support; the upper adjustment positive and negative threaded rod is threaded between the upper left adjustment adapter block and the upper right adjustment adapter block, and positioning fastening screws are installed on both the upper left and upper right adjustment adapter blocks; the lower adjustment positive and negative threaded rod is distributed parallel to the upper adjustment positive and negative threaded rod, and is threaded between the lower left and lower right adjustment adapter blocks, and positioning fastening screws are installed on both the lower left and lower right adjustment adapter blocks; a passage gap for the fiber optic sensor is left between the left clamping wheel and the right clamping wheel.

9. A fiber optic sensor calibration kit according to claim 8, characterized in that: The fiber optic sensor non-destructive fixture is equipped with an adapter threaded rod. When the fiber optic sensor non-destructive fixture is used in conjunction with the curvature-torsion calibration unit, each fiber optic sensor non-destructive fixture is equipped with an adapter threaded rod. One end of the adapter threaded rod is fixedly connected to the left clamping wheel support or the right clamping wheel support, and the other end of the adapter threaded rod is fixedly connected to the vertical slider. When the fiber optic sensor non-destructive fixture is used in conjunction with the torsion rate calibration unit, each fiber optic sensor non-destructive fixture is equipped with two adapter threaded rods. One adapter threaded rod is connected to each of the left and right clamping wheel supports. The adapter threaded rod on the left clamping wheel support is fixedly connected to the top left end of the semi-circular ring gear through the left clamping plate, and the adapter threaded rod on the right clamping wheel support is fixedly connected to the top right end of the semi-circular ring gear through the right clamping plate.

10. A fiber optic sensor calibration kit according to claim 1, characterized in that: The curvature-torsion calibration unit, the torsion calibration unit, and the fiber optic sensor non-destructive fixture are equipped with a tool storage box, which has several storage slots. The components of the decomposed curvature-torsion calibration unit, the components of the decomposed torsion calibration unit of different sizes, and the fiber optic sensor non-destructive fixture of different sizes are all placed in the tool storage box through the storage slots.

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