Synchronous rotating optical fiber length measuring device

Abstract

The invention discloses a synchronous rotating optical fiber length measuring device, comprising a support frame, a rotating shaft, a synchronous motor, a conductive slip ring and a proximity sensor, wherein the support frame is fixed on one side of a friction wheel to be measured, the synchronous motor is mounted on the support frame, the rotating shaft is connected to the output end of the synchronous motor, the conductive slip ring is mounted on the rotating shaft, and the proximity sensor is mounted on the conductive slip ring. When the proximity sensor and the friction wheel to be measured are relatively stationary, the projection of the end face of the proximity sensor on the friction wheel to be measured is an equivalent gap. When the friction wheel to be measured rotates, the equivalent gap changes, and the proximity sensor gives a synchronous rotation signal to the synchronous motor through the conductive slip ring. The length measuring device has the advantages of simple and reliable structure and can improve measurement accuracy.

Description

Technical Field

[0001] The invention mainly relates to optical fiber length measurement technology, and in particular to a synchronous rotating optical fiber length measurement device. Background Art

[0002] With the continuous development of optical fiber technology in the civil and military fields, the accurate measurement of optical fiber length plays an increasingly important role in optical fiber communication and optical fiber sensing systems. Existing optical fiber measurement devices mainly include low-coherence optical reflectometers, optical time domain reflectometers, optical frequency domain reflectometers, and optical coherence domain reflectometers.

[0003] During the winding process of the optical fiber ring, the length of each layer of optical fiber wound on the optical fiber ring needs to be accurately measured. This measurement process must be done online. In addition, since the optical fiber is very thin, with a diameter of about 0.15mm, and is transparent, it is easy to break under great force. Therefore, the online measurement method is very limited. The above measurement devices are not applicable, and the measurement is inconvenient and the measurement accuracy is not high.

[0004] At present, the existing winding machines in China mostly use the number of fiber winding turns to calculate the fiber length. The fiber diameter and the winding radius of each layer of fiber are set according to the theoretical design value. In the actual winding process, due to the influence of filling glue, fiber diameter error and irregular fiber arrangement, there is a certain error between the set radius and the actual radius, which will cause fiber length measurement errors. Since the optical fiber itself is transparent, small in diameter, and insensitive to electromagnetics, it cannot be disconnected during the winding process. Therefore, it is impossible to achieve online precise fiber length measurement using conventional length and speed measurement sensors. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a synchronous rotating optical fiber length measuring device which has a simple and reliable structure and can improve the measurement accuracy.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A synchronous rotating optical fiber length measuring device comprises a support frame, a rotating shaft, a synchronous motor, a conductive slip ring and a proximity sensor, wherein the support frame is fixed on one side of a friction wheel to be measured, the synchronous motor is mounted on the support frame, the rotating shaft is connected to the output end of the synchronous motor, the conductive slip ring is mounted on the rotating shaft, and the proximity sensor is mounted on the conductive slip ring. When the proximity sensor and the friction wheel to be measured are relatively stationary, the projection of the end face of the proximity sensor on the friction wheel to be measured is an equivalent gap. When the friction wheel to be measured rotates, the equivalent gap changes, and the proximity sensor gives a synchronous rotation signal to the synchronous motor through the conductive slip ring.

[0008] As a further improvement of the above technical solution:

[0009] The support frame comprises a base and a support cover, the support cover is mounted on the base, the synchronous motor is mounted on the outside of the support cover, and the rotating shaft, the conductive slip ring and the proximity sensor are mounted on the inside of the support cover.

[0010] A vertical waist-shaped hole is provided on the support cover, and the vertical waist-shaped hole is fastened to the base through bolts.

[0011] The synchronous motor is configured as a stepping motor.

[0012] The synchronous motor is configured as a servo motor.

[0013] The synchronous motor is configured as a DC motor.

[0014] Compared with the prior art, the advantages of the present invention are:

[0015] The synchronous rotating optical fiber length measuring device of the present invention has multiple through holes for weight reduction evenly distributed on the friction wheel, and the edge of any through hole is used as the object to be measured by the proximity sensor. The proximity sensor is installed parallel to the rotating shaft. When the proximity sensor and the friction wheel are relatively stationary (at the equilibrium position), the projection of the end face of the induction head on the friction wheel is the equivalent gap. When the friction wheel rotates (when it is winding), the projection area (equivalent gap) of the proximity sensor on the friction wheel will change, and the output voltage V0 will change. The changed voltage signal is used as a feedback signal, and the feedback voltage signal is used to control the forward, reverse, fast and slow rotation of the synchronous motor. When the friction wheel rotates forward, the equivalent gap becomes smaller, and the output voltage of the proximity sensor becomes larger. At this time, the synchronous motor rotates forward accordingly, and the motor stops rotating when the equivalent gap reaches the equilibrium position. When the friction wheel reverses, the equivalent gap becomes larger, and the output voltage of the proximity sensor becomes smaller. At this time, the synchronous motor reverses accordingly, and the motor stops rotating when the equivalent gap reaches the equilibrium position. While the synchronous motor is rotating, the number of pulse signals of the synchronous motor is collected or the encoder signal that rotates synchronously with the synchronous motor is read to calculate the angle of rotation of the motor (friction wheel), which is finally converted into the displacement value of the optical fiber line. Since the proximity sensor must rotate synchronously with the synchronous motor and the friction wheel, the power supply and signal output interface of the proximity sensor are provided through a conductive slip ring. Compared with the traditional structure, the proximity sensor and the friction wheel of the online length measurement device form a non-contact measurement, which will not increase the friction of the synchronous wheel, nor increase the inertia, and improve the overall measurement accuracy; the overall structure is simple and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the main structure of the synchronous rotating optical fiber length measuring device of the present invention.

[0017] Figure 2 It is a schematic diagram of the three-dimensional structure of the synchronous rotating optical fiber length measuring device of the present invention.

[0018] Figure 3 It is a schematic diagram of the three-dimensional structure of the synchronous rotating optical fiber length measuring device of the present invention (from another perspective).

[0019] Figure 4 It is a control flow chart of embodiment 1 of the present invention.

[0020] Figure 5 It is a control flow chart of embodiment 2 of the present invention.

[0021] Figure 6 It is a control flow chart of embodiment 3 of the present invention.

[0022] The symbols in the figure represent:

[0023] 1. Support frame; 11. Base; 12. Support cover; 121. Vertical waist-shaped hole; 2. Rotating shaft; 3. Synchronous motor; 4. Conductive slip ring; 5. Proximity sensor; 6. Friction wheel to be tested; 7. Bolt. DETAILED DESCRIPTION

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Embodiment 1:

[0026] Figures 1 to 4The first embodiment of the synchronous rotating optical fiber length measuring device of the present invention is shown, which includes a support frame 1, a rotating shaft 2, a synchronous motor 3, a conductive slip ring 4 and a proximity sensor 5. The support frame 1 is fixed on one side of the friction wheel 6 to be measured, the synchronous motor 3 is installed on the support frame 1, the rotating shaft 2 is connected to the output end of the synchronous motor 3, the conductive slip ring 4 is installed on the rotating shaft 2, and the proximity sensor 5 is installed on the conductive slip ring 4. When the proximity sensor 5 and the friction wheel 6 to be measured are relatively stationary, the projection of the end face of the proximity sensor 5 on the friction wheel 6 to be measured is an equivalent gap. When the friction wheel 6 to be measured rotates, the equivalent gap changes, and the proximity sensor 5 gives the synchronous motor 3 a synchronous rotation signal through the conductive slip ring 4. In this structure, a plurality of through holes for weight reduction are evenly distributed on the friction wheel 6 to be measured, with an aperture of φ12, and the edge of any through hole is used as the object to be measured by the proximity sensor 5. The sensing distance of the proximity sensor 5 is 0-6mm, the output voltage is 0-10V, the outer diameter is M8 / M12mm, and the proximity sensor 5 is installed parallel to the rotating shaft 2. When the proximity sensor 5 and the friction wheel 6 to be measured are relatively stationary (at the equilibrium position), the projection of the end face of the induction head on the friction wheel is the equivalent gap. When the friction wheel 6 to be measured rotates (when winding), the projection area (equivalent gap) of the proximity sensor 5 on the friction wheel 6 to be measured will change, and the output voltage V0 will change. The changed voltage signal is used as a feedback signal, and the feedback voltage signal is used to control the forward, reverse, fast and slow rotation of the synchronous motor 3. When the friction wheel 6 to be measured rotates forward, the equivalent gap becomes smaller, and the output voltage of the proximity sensor 5 becomes larger. At this time, the synchronous motor 3 rotates forward accordingly, and the motor stops rotating when the equivalent gap reaches the equilibrium position. When the friction wheel 6 to be measured reverses, the equivalent gap becomes larger, and the output voltage of the proximity sensor 5 becomes smaller. At this time, the synchronous motor 3 reverses accordingly, and the motor stops rotating when the equivalent gap reaches the equilibrium position. While the synchronous motor 3 is rotating, the number of pulse signals of the synchronous motor 3 is collected or the encoder signal rotating synchronously with the synchronous motor 3 is read to calculate the angle rotated by the motor (friction wheel 6 to be measured), which is finally converted into the displacement value of the optical fiber line. Since the proximity sensor 5 must rotate synchronously with the synchronous motor 3 and the friction wheel 6 to be measured, the conductive slip ring 4 is used to provide the proximity sensor 5 with a power supply and a signal output interface. Compared with the traditional structure, the proximity sensor 5 of the online length measurement device forms a non-contact measurement with the friction wheel 6 to be measured, which will not increase the friction force of the friction wheel 6 to be measured, nor will it increase the inertia, thereby improving the measurement accuracy as a whole; the overall structure is simple and reliable.

[0027] In this embodiment, the support frame 1 includes a base 11 and a support cover 12, the support cover 12 is mounted on the base 11, the synchronous motor 3 is mounted on the outside of the support cover 12, and the rotating shaft 2, the conductive slip ring 4 and the proximity sensor 5 are mounted on the inside of the support cover 12. In this structure, the support cover 12 is used to support and cover the rotating shaft 2, the conductive slip ring 4 and the proximity sensor 5, which can prevent dust accumulation from affecting the measurement on the one hand, and improve the aesthetics on the other hand.

[0028] In this embodiment, a vertical waist-shaped hole 121 is provided on the support cover 12, and the vertical waist-shaped hole 121 is fastened to the base 11 by bolts 7. In this structure, the vertical waist-shaped hole 121 enables the support cover 12 to be adjusted in height, thereby improving the convenience of use.

[0029] In this embodiment, the synchronous motor 3 is configured as a stepping motor. Figure 2 As shown, when using the stepper motor measurement solution, the voltage signal output by the proximity sensor 5 is sent to a control card with A / D (such as Advantech PCL1710 multi-function card), 12-bit A / D, and the sampling frequency can reach 100KHz. According to the magnitude of the voltage, the number of steps and the direction of rotation of the stepper motor are calculated, and the control card outputs the corresponding pulse and direction signal to the driver, and the driver controls the motor to rotate accordingly. By calculating the number of output pulses, the angle rotated by the motor can be calculated, that is, the angle rotated by the friction wheel 6 to be measured and the length of the optical fiber wound. The advantages of using this solution are: the synchronous rotation forms a closed loop with the host machine. When the voltage output by the proximity sensor 5 is nonlinear, it can be linearly corrected by software calculation, thereby ensuring the stability of the synchronous rotation; when there is an abnormal situation in the process of winding and reversing, the program can make a judgment and perform corresponding calculations or compensation; when the proximity sensor 5 is in any position, the motor can be controlled by the program to automatically find the balance position; the function is easy to expand.

[0030] Embodiment 2:

[0031] Figures 1 to 3 as well as Figure 5 The second embodiment of the synchronous rotating optical fiber length measuring device of the present invention is shown. The length measuring device is basically the same as the embodiment 1, and the only difference is that in this embodiment, the synchronous motor 3 is set as a servo motor. When the servo measurement scheme is adopted, in addition to using the upper computer feedback method to form a closed-loop control like the stepping motor scheme, it can also be connected to a bottom-level closed-loop control mode. The voltage signal output by the proximity sensor 5 can be directly sent to the analog input terminal (input voltage range -10V~+10V) of the motor driver control after level conversion to control the speed and forward and reverse rotation of the motor. In this way, closed-loop control can be formed at the bottom level, and the upper computer is only responsible for sampling the rotation angle. The A and B coding signals output by the driver are sent to the upper computer counting card for counting. The advantage of adopting this scheme is that the angle measurement is accurate and there is no step loss.

[0032] Embodiment 3:

[0033] Figures 1 to 3 as well as Figure 6The third embodiment of the synchronous rotating optical fiber length measuring device of the present invention is shown. The length measuring device is basically the same as the embodiment 1, and the only difference is that in this embodiment, the synchronous motor 3 is set as a DC motor. When the DC motor measurement scheme is adopted, the voltage signal output by the proximity sensor 5 is sent to the motor speed regulator to control the speed and forward and reverse rotation of the motor. Since the low-speed performance of the DC motor is poor, it is necessary to add a speed regulator or a reducer to increase the speed regulation range. The DC motor drives the encoder to rotate synchronously. The signal output by the encoder can be sent to the reading table for display and read into the computer through RS232 / 485. The output signal of the encoder can also be sent to the counting card for counting. With this scheme, a closed-loop control is formed in the lower machine, which simplifies the upper machine program.

[0034] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A synchronous rotating optical fiber length measuring device, characterized in that: The invention comprises a support frame (1), a rotating shaft (2), a synchronous motor (3), a conductive slip ring (4) and a proximity sensor (5), wherein the support frame (1) is fixed to one side of a friction wheel (6) to be tested, the synchronous motor (3) is mounted on the support frame (1), the rotating shaft (2) is connected to the output end of the synchronous motor (3), the conductive slip ring (4) is mounted on the rotating shaft (2), and the proximity sensor (5) is mounted on the conductive slip ring (4). A plurality of through holes for weight reduction are evenly distributed on the friction wheel (6) to be tested, and the edge of any one of the through holes is used as a target of the proximity sensor (5). The object to be measured is a proximity sensor (5) installed parallel to the rotating shaft (2). When the proximity sensor (5) and the friction wheel (6) to be measured are relatively stationary, the projection of the end face of the proximity sensor (5) on the friction wheel (6) to be measured is an equivalent gap. When the friction wheel (6) to be measured rotates, the equivalent gap changes. The proximity sensor (5) gives a synchronous rotation signal to the synchronous motor (3) through the conductive slip ring (4). While the synchronous motor (3) rotates, the number of pulse signals of the synchronous motor (3) is collected to calculate the angle rotated by the motor or the friction wheel (6) to be measured, and finally converts it into a displacement value of the optical fiber line.

2. The synchronous rotating optical fiber length measuring device according to claim 1, characterized in that: The support frame (1) comprises a base (11) and a support cover (12), wherein the support cover (12) is mounted on the base (11), the synchronous motor (3) is mounted on the outside of the support cover (12), and the rotating shaft (2), the conductive slip ring (4) and the proximity sensor (5) are mounted on the inside of the support cover (12).

3. The synchronous rotating optical fiber length measuring device according to claim 2, characterized in that: The support cover (12) is provided with a vertical waist-shaped hole (121), and the vertical waist-shaped hole (121) is fastened to the base (11) via a bolt (7).

4. The synchronous rotation type optical fiber length measuring device according to any one of claims 1 to 3, characterized in that: The synchronous motor (3) is configured as a stepping motor.

5. The synchronous rotation type optical fiber length measuring device according to any one of claims 1 to 3, characterized in that: The synchronous motor (3) is configured as a servo motor.

6. The synchronous rotation type optical fiber length measuring device according to any one of claims 1 to 3, characterized in that: The synchronous motor (3) is configured as a DC motor.

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