Optical fiber sensor weaving device and method

Abstract

The invention discloses an optical fiber sensor weaving device and method. The optical fiber sensor weaving device comprises a rack, and a multi-core optical fiber traction module, a single-mode optical fiber guide module, an optical fiber winding module and an optical fiber winding module are arranged on the rack; the multi-core optical fiber traction module comprises oppositely arranged multi-core optical fiber releasing side turntables, the multi-core optical fiber releasing side turntables are driven by a multi-core optical fiber releasing driving motor to rotate, and the two multi-core optical fiber releasing side turntables are used for pulling a multi-core optical fiber to move; the single-mode optical fiber guide module comprises a fiber guide wheel which is used for guiding a single-mode optical fiber path and controlling a single-mode optical fiber winding angle; the optical fiber winding module comprises a rotating head, a single-mode optical fiber guiding module is mounted on the rotating head, and the rotating head is used for driving the single-mode optical fiber guiding module to rotate; and the optical fiber winding module comprises a fiber winding side turntable, and the fiber winding side turntable is used for winding the wound optical fiber. High synchronism between the multi-core optical fiber and the single-mode optical fiber is ensured; therefore, the winding position of the single-mode optical fiber on the multi-core optical fiber is more stable.

Description

Technical Field

[0001] The invention belongs to the field of optical fiber optoelectronics, and in particular relates to an optical fiber sensor weaving device and method. Background Art

[0002] There are many types of fiber shape sensors, such as a fiber bundle structure consisting of three optical fibers (bound by adhesive or physically embedded), multi-core straight core and multi-core helical core fiber structures (three cores, four cores or seven cores), etc. After writing standard Bragg grating sensor arrays or combining them with different measurement technologies, these shape sensors can well meet different shape monitoring needs.

[0003] Distributed shape sensing technology uses optical fiber as a common carrier for data transmission and external information perception. Each position point on it is a sensing unit, which can measure deformation information at any position along the sensor. It is a truly high spatial resolution, high test distance, and fully distributed shape perception method. According to different types of scattered light, it can be divided into Brillouin scattering-based and backward Rayleigh scattering-based sensing technologies.

[0004] The optical frequency domain reflectometry system can reconstruct the sensor shape based on the FBG sensor array information or the backscattering information. For example, in 2005, Joseph R. Blandino et al. used OFDR technology to demodulate the grating array information on the fiber bundle shape sensor and studied the shape monitoring of the boom during the maneuvering and deployment of the spacecraft, aiming to provide real-time information on the boom shape and capture the dynamic behavior of the boom as a feedback control mechanism. In 2006, Luna Corporation of the United States used OFDR technology to measure the strain information of grating arrays in multi-core optical fibers, and the accuracy of the final reconstructed three-dimensional shape was 3.9% of the total length of the optical fiber; in 2007, Duncan et al. found that OFDR technology was significantly better than shape sensing technology based on fiber grating arrays in terms of shape reconstruction accuracy. The latter had a measurement error of 1.9mm for the reel diameter, while the former had a measurement error of only 0.3mm; in 2012, Jason P. Moore and others from NASA of the United States used OFDR technology to demodulate the strain information of FBG arrays in three-core optical fibers, and combined with the Frenet-Serret differential framework to determine the complex three-dimensional shape of the optical fiber as a continuous parameter solution. The experimental results showed that the end error of a 1.11m multi-core optical fiber reached 70.07mm, which was 7.2% of the total length of the optical fiber; in 2016, Paul S. Westbrook's team reported the precision fabrication of ultra-long continuous FBG sensor arrays in spiral multi-core optical fibers and their distributed measurement capabilities. Combining OFDR technology and fiber shape reconstruction algorithm, it is proved that this fiber structure has good bending sensing ability; in 2017, Francois Parent's team used OFDR technology to perform shape sensing on optical fibers with high scattering characteristics. The sensing accuracy was improved by 47% using UV-exposed ordinary single-mode optical fiber. The experimental results showed that the accuracy achieved by this method was comparable to that using an FBG sensor array (about 1mm); and the 3D shape of a 20cm catheter was subsequently tracked in a vascular model and a living pig, with shape end errors of 1.2mm and 2.8mm, respectively. In 2019, Chong et al. proposed a local spectral matching method to weaken false peaks and multiple peaks in OFDR cross-correlation operations, accurately demodulate strain information during deformation, and improve shape reconstruction accuracy; in 2021, ZeenChen et al. demonstrated a large curvature radius shape sensing experiment in a multi-core optical fiber using an optical frequency domain reflectometer (OFDR). By reconstructing the error model, optimizing the measurable strain resolution and sensing space resolution, a two-dimensional (2D) circular shape with a curvature radius of 5cm~100cm was reconstructed. The average Euclidean distance between the reconstructed shape and the designed spatial curve was 3.4mm.

[0005] In summary, due to the lack of effective single-mode optical fiber path guidance and angle control mechanism in the existing technology, the winding angle of single-mode optical fiber on multi-core optical fiber is difficult to meet the design requirements, which directly affects the sensitivity and stability of the optical fiber sensor. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a fiber optic sensor weaving device and method, which realizes the precise winding of the single-mode optical fiber on the multi-core optical fiber by winding and weaving the single-mode optical fiber during the multi-core optical fiber traction process, and ensures high synchronization between the multi-core optical fiber and the single-mode optical fiber through the multi-core optical fiber traction module and the optical fiber winding module driven by a servo motor; this makes the winding position of the single-mode optical fiber on the multi-core optical fiber more stable, thereby improving the quality and consistency of the product.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is: An optical fiber sensor braiding device comprises a frame, on which a multi-core optical fiber traction module, a single-mode optical fiber guide module, an optical fiber winding module and an optical fiber winding module are arranged; The multi-core optical fiber traction module includes multi-core optical fiber release side turntables arranged opposite to each other, the multi-core optical fiber release side turntables are driven to rotate by a multi-core optical fiber release driving motor, and the two multi-core optical fiber release side turntables are used to pull the multi-core optical fiber to move; The single-mode optical fiber guide module includes a fiber guide wheel, which is used to guide the single-mode optical fiber path and control the winding angle of the single-mode optical fiber; The optical fiber winding module includes a rotating head, on which a single-mode optical fiber guide module is mounted, and the rotating head is used to drive the single-mode optical fiber guide module to rotate; The optical fiber winding module includes a fiber winding side turntable, which is used to wind up the wound optical fiber. Preferably, there are multiple single-mode optical fiber guiding modules, and the multiple single-mode optical fiber guiding modules are arranged in a ring around the rotating head. Preferably, the single-mode optical fiber guiding module guides the optical fiber path through a plurality of fiber guiding wheels, and one of the fiber guiding wheels is close to the multi-core optical fiber.

[0008] Preferably, the rotating head is driven to rotate by a winding driving motor, and the axis of the rotating head is provided with a channel through which the multi-core optical fiber passes.

[0009] Preferably, the device further comprises an optical fiber setting module, and the optical fiber setting module is arranged between the optical fiber winding module and the optical fiber winding module.

[0010] Preferably, the optical fiber setting module comprises a setting turntable, and the setting turntable is driven to move by a transverse driving device. Preferably, a first guide wheel is provided at the output end of the multi-core optical fiber traction module, and the first guide wheel controls the damping value through a hysteresis brake B. A second guide wheel is provided at the front end of the optical fiber winding module, and the second guide wheel controls the damping value through a hysteresis brake A. Hysteresis brake A and hysteresis brake B are used to control the tension of the multi-core optical fiber.

[0011] Preferably, the fiber guide wheel of the single-mode optical fiber guide module includes a single-mode optical fiber release side turntable, an intermediate guide wheel and an angle adjustment guide wheel. The single-mode optical fiber release side turntable is driven to rotate by a single-mode optical fiber release drive motor, and the angle adjustment guide wheel is driven to move by an angle adjustment cylinder.

[0012] A weaving method for an optical fiber sensor weaving device includes the following working conditions: When winding the fiber, the multi-core fiber release drive motor of the fiber winding module drives the fiber winding side turntable to rotate, and the hysteresis brake A generates reverse torque to straighten the multi-core optical fiber; the operator inputs the required tension of the multi-core optical fiber through the operation screen, and the PLC controller calculates and outputs analog voltage to the controller of the hysteresis brake A, and the second guide wheel generates corresponding torque; When withdrawing the fiber, the hysteresis brake B works, the turntable on the multi-core fiber release side of the multi-core fiber traction module rotates, and the hysteresis brake B generates a reverse torque to straighten the multi-core optical fiber; the operator inputs the required tension of the multi-core optical fiber on the operation screen, and the PLC controller calculates and outputs an analog voltage to the controller of the hysteresis brake B, and the first guide wheel generates a corresponding torque.

[0013] The fiber entry angle of the single-mode optical fiber is controlled by adjusting the position of the entry angle adjustment guide wheel, thereby ensuring the synchronization between the multi-core optical fiber and the single-mode optical fiber.

[0014] The present invention can achieve the following beneficial effects: 1. The single-mode optical fiber guide module contains multiple fiber guide wheels, which can accurately control the path and winding angle of the single-mode optical fiber. In particular, the angle adjustment guide wheel is close to the multi-core optical fiber, which further improves the accuracy of the winding angle and ensures the sensitivity and stability of the optical fiber sensor.

[0015] 2. The multi-core fiber traction module and fiber winding module driven by servo motors ensure high synchronization between multi-core fiber and single-mode fiber. This makes the winding position of single-mode fiber on multi-core fiber more stable, improving product quality and consistency.

[0016] 3. Hysteresis brake A and hysteresis brake B are introduced to control the tension of multi-core optical fiber during fiber collection and fiber withdrawal. The torque of the hysteresis brake is adjusted in real time through the PLC controller to achieve precise control of the tension of multi-core optical fiber, reduce optical fiber damage, and improve the yield rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Figure 1 It is a front view of a fiber optic sensor braiding device in the present invention; Figure 2 for Figure 1 Middle AA section; Figure 3 for Figure 1 Middle BB section; Figure 4 Layout diagram of the first guide wheel and the second guide wheel of the present invention; Figure 5 A three-dimensional structural diagram of an optical fiber sensor braiding device in the present invention; Figure 6 This is a layout diagram of the single-mode optical fiber release side turntable, the middle guide wheel and the angle adjustment guide wheel of the present invention; Figure 7 Schematic diagram of the fiber insertion angle of the present invention.

[0018] In the figure: multi-core optical fiber traction module 1, single-mode optical fiber guiding module 2, single-mode optical fiber release side turntable 201, intermediate guide wheel 202, entry angle adjustment guide wheel 203, optical fiber winding module 3, optical fiber adjustment module 4, multi-core optical fiber 5, optical fiber winding module 6, optical fiber winding point 7, first guide wheel 8, second guide wheel 9, winding point 10. DETAILED DESCRIPTION

[0019] The preferred solution is Figures 1 to 7 As shown, a fiber optic sensor braiding device includes a frame, on which a multi-core fiber optic traction module 1, a single-mode fiber optic guide module 2, a fiber optic winding module 3 and a fiber optic winding module 6 are arranged; Figure 2 As shown, a multi-core optical fiber traction module 1, an optical fiber winding module 3, a single-mode optical fiber guiding module 2, an optical fiber setting module 4, and an optical fiber winding module 6 are installed on the rack in sequence from left to right.

[0020] The multi-core optical fiber traction module 1 comprises relatively arranged multi-core optical fiber release side turntables, which are driven to rotate by a multi-core optical fiber release drive motor. The two multi-core optical fiber release side turntables are used to pull the multi-core optical fiber 5 to move; the multi-core optical fiber release drive motor is a servo motor.

[0021] The single-mode optical fiber guide module 2 includes a fiber guide wheel, which is used to guide the single-mode optical fiber path and control the winding angle of the single-mode optical fiber; there are multiple fiber guide wheels, and multiple fiber guide wheels guide the optical fiber path, control the winding angle of the single-mode optical fiber, and at the same time, the position of the angle adjustment guide wheel 203 is as close as possible to the multi-core optical fiber.

[0022] The optical fiber winding module 3 includes a rotating head, on which a single-mode optical fiber guide module 2 is mounted, and the rotating head is used to drive the single-mode optical fiber guide module 2 to rotate; the rotating head includes a rotating frame and a winding drive motor, and the winding drive motor is a servo motor, which drives the rotating head to rotate through a reducer, and the rotating head is used to drive the single-mode optical fiber guide module 2 to rotate. The number of single-mode optical fiber guide modules 2 is four sets.

[0023] The optical fiber winding module 6 includes a fiber winding side turntable, which is used to wind up the wound optical fiber. The fiber winding side turntable is driven to rotate by a servo motor. Preferably, if Figure 3 As shown, there are multiple single-mode optical fiber guiding modules 2, and the multiple single-mode optical fiber guiding modules 2 are arranged in a ring around the rotating head. Specifically, there are four single-mode optical fiber guiding modules 2. Preferably, the single-mode optical fiber guiding module 2 guides the optical fiber path through a plurality of fiber guiding wheels, and one of the fiber guiding wheels is close to the multi-core optical fiber 5 .

[0024] Preferably, the rotating head is driven to rotate by a winding drive motor, and the axis of the rotating head is provided with a channel through which the multi-core optical fiber 5 passes.

[0025] Preferably, it also includes an optical fiber adjustment module 4 , which is arranged between the optical fiber winding module 3 and the optical fiber winding module 6 .

[0026] Preferably, the optical fiber setting module 4 includes a setting turntable, which is driven to move by a lateral driving device. Figure 5 As shown, there are two setting turntables, which are driven to move back and forth laterally by a transverse driving device, wherein the transverse driving device is a cylinder or a screw driving device. Preferably, a first guide wheel 8 is provided at the output end of the multi-core optical fiber traction module 1, and the first guide wheel 8 controls the damping value through a hysteresis brake B. A second guide wheel 9 is provided at the front end of the optical fiber winding module 6, and the second guide wheel 9 controls the damping value through a hysteresis brake A. The hysteresis brake A and the hysteresis brake B are used to control the tension of the multi-core optical fiber 5.

[0027] The fiber guide wheel of the single-mode fiber guide module 2 includes a single-mode fiber release side turntable 201, an intermediate guide wheel 202 and an angle adjustment guide wheel 203. The single-mode fiber release side turntable 201 is driven to rotate by a single-mode fiber release drive motor, and the angle adjustment guide wheel 203 is driven to move by an angle adjustment cylinder. Figure 7 As shown, the fiber entry angle α of the single-mode optical fiber can be adjusted by adjusting the position of the entry angle adjustment guide wheel 203, α= .in, represents the distance between the end of the angle adjustment guide wheel 203 and the multi-core optical fiber 5, Indicates the distance between the end of the angle adjustment guide wheel 203 and the winding point.

[0028] A weaving method for an optical fiber sensor weaving device includes the following working conditions: When collecting the fiber, the multi-core fiber release driving motor of the fiber winding module 6 drives the fiber collection side turntable to rotate, and the hysteresis brake A generates a reverse torque to straighten the multi-core optical fiber 5; the operator inputs the required tension of the multi-core optical fiber 5 through the operation screen, and the PLC controller calculates and outputs an analog voltage to the controller of the hysteresis brake A, and the second guide wheel 9 generates a corresponding torque; When withdrawing the fiber, the hysteresis brake B works, the turntable on the multi-core optical fiber releasing side of the multi-core optical fiber traction module 1 rotates, and the hysteresis brake B generates a reverse torque to straighten the multi-core optical fiber 5; the operator inputs the required tension of the multi-core optical fiber 5 on the operation screen, and the PLC controller calculates and outputs an analog voltage to the controller of the hysteresis brake B, and the first guide wheel 8 generates a corresponding torque.

[0029] The present invention adjusts the speed of the single-mode optical fiber through the feedback of the tension of the single-mode optical fiber, so that the running speed of the multi-core optical fiber 5 is proportional to that of the single-mode optical fiber. Since the running speed of the multi-core optical fiber is proportional to that of the single-mode optical fiber, the position of the winding point on the multi-core optical fiber is fixed, and the fiber entry angle of the single-mode optical fiber can be adjusted by adjusting the position of the entry angle adjustment guide wheel 203.

[0030] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. An optical fiber sensor braiding device, comprising a frame, characterized in that: The frame is provided with a multi-core optical fiber pulling module (1), a single-mode optical fiber guiding module (2), an optical fiber winding module (3) and an optical fiber winding module (6); The multi-core optical fiber pulling module (1) comprises multi-core optical fiber releasing side turntables arranged opposite to each other, the multi-core optical fiber releasing side turntables being driven to rotate by a multi-core optical fiber releasing driving motor, and the two multi-core optical fiber releasing side turntables being used to pull the multi-core optical fiber (5) to move; The single-mode optical fiber guiding module (2) comprises a fiber guiding wheel, which is used to guide the path of the single-mode optical fiber and control the winding angle of the single-mode optical fiber; The optical fiber winding module (3) comprises a rotating head, on which a single-mode optical fiber guiding module (2) is mounted, and the rotating head is used to drive the single-mode optical fiber guiding module (2) to rotate; The optical fiber winding module (6) comprises a fiber winding side turntable, and the fiber winding side turntable is used to wind up the wound optical fiber.

2. The optical fiber sensor braiding device according to claim 1, characterized in that: There are multiple single-mode optical fiber guiding modules (2), and the multiple single-mode optical fiber guiding modules (2) are arranged in a ring around the rotating head.

3. The optical fiber sensor braiding device according to claim 1, characterized in that: The single-mode optical fiber guiding module (2) guides the optical fiber path through a plurality of fiber guiding wheels, and one of the fiber guiding wheels is close to the multi-core optical fiber (5).

4. The optical fiber sensor braiding device according to claim 1, characterized in that: The rotating head is driven to rotate by a winding drive motor, and the axis of the rotating head is provided with a channel through which the multi-core optical fiber (5) passes.

5. The optical fiber sensor braiding device according to claim 1, characterized in that: It also comprises an optical fiber adjustment module (4), which is arranged between the optical fiber winding module (3) and the optical fiber take-up module (6).

6. The optical fiber sensor braiding device according to claim 5, characterized in that: The optical fiber setting module (4) comprises a setting turntable, and the setting turntable is driven to move by a transverse driving device.

7. The optical fiber sensor braiding device according to claim 1, characterized in that: A first guide wheel (8) is provided at the output end of the multi-core optical fiber traction module (1), and the damping value of the first guide wheel (8) is controlled by a hysteresis brake B. A second guide wheel (9) is provided at the front end of the optical fiber winding module (6), and the damping value of the second guide wheel (9) is controlled by a hysteresis brake A. The hysteresis brake A and the hysteresis brake B are used to control the tension of the multi-core optical fiber (5).

8. The optical fiber sensor braiding device according to claim 1, characterized in that: The fiber guide wheel of the single-mode optical fiber guide module (2) comprises a single-mode optical fiber release side turntable (201), an intermediate guide wheel (202) and an entry angle adjustment guide wheel (203); the single-mode optical fiber release side turntable (201) is driven to rotate by a single-mode optical fiber release drive motor, and the entry angle adjustment guide wheel (203) is driven to move by an angle adjustment cylinder.

9. A weaving method for an optical fiber sensor weaving device according to any one of claims 1 to 8, characterized in that The following conditions are included: When collecting the fibers, the multi-core optical fiber release drive motor of the optical fiber winding module (6) drives the fiber collection side turntable to rotate, and the hysteresis brake A generates a reverse torque to straighten the multi-core optical fiber (5); the operator inputs the required tension of the multi-core optical fiber (5) through the operation screen, and the PLC controller calculates and outputs an analog voltage to the controller of the hysteresis brake A, and the second guide wheel (9) generates a corresponding torque; When the fiber is withdrawn, the hysteresis brake B works, the turntable on the multi-core optical fiber release side of the multi-core optical fiber pulling module (1) rotates, and the hysteresis brake B generates a reverse torque to straighten the multi-core optical fiber (5); the operator inputs the required tension of the multi-core optical fiber on the operation screen, and the PLC controller calculates and outputs an analog voltage to the controller of the hysteresis brake B, and the first guide wheel (8) generates a corresponding torque; The fiber entry angle of the single-mode optical fiber is controlled by adjusting the position of the entry angle adjustment guide wheel (203), thereby ensuring the synchronization between the multi-core optical fiber and the single-mode optical fiber.

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