UwDAS optical cable and audio box combined device for equipment fault monitoring

Abstract

The utility model discloses a uwDAS optical cable and audio box combined device for equipment fault monitoring. The device comprises a sensing optical cable, an audio box base, an audio box mandrel, an audio box cover and a sensing optical fiber, the sensing optical fiber is tightly wound on the audio box core shaft, and the audio box core shaft is fixed on the audio box base; the audio box base and the audio box cover are assembled to form an audio box; and the sensing optical cable is connected with the sensing optical fiber in the audio box to form an optical cable and audio box combined device. Through the uwDAS optical cable and audio box combined device, long-distance and high-sensitivity detection of equipment operation sound wave signals can be realized; the system has the characteristics of high sensitivity, stable structure, flexible deployment, continuous coverage, distributed detection, industrial adaptability and the like.

Description

Technical Field

[0001] This utility model relates to the field of equipment fault monitoring technology, specifically to a combination device of uwDAS optical cable and audio box for equipment fault monitoring. Background Technology

[0002] The distributed acoustic sensing (DAS) system based on ultra-weak fiber Bragg gratings (uwFBG) (uwDAS) reconstructs acoustic information by detecting the phase information of the Fizeau interference of reflected light from adjacent gratings. It features passive operation, resistance to electromagnetic interference, and large capacity. Moreover, a single fiber can reuse up to tens of thousands of gratings, enabling long-distance, multi-node distributed data acquisition. It is widely used in fault monitoring and early warning of many equipment, such as belt conveyor fault detection.

[0003] When detecting equipment faults, fiber optic sensors are deployed along the equipment line to accurately analyze its operating status by real-time detection and analysis of its operating sounds. While using fiber optic cables for the sensing unit offers significant advantages in terms of wide coverage, cost reduction, and deployment efficiency, the sheathing and spiral armor of the cable itself affect the coupling between the internal sensing fiber and the external environment, thus impacting its sensitivity and affecting the accuracy of identifying early, minor faults. Therefore, to improve the sensing unit's ability to detect minute abnormal sounds, it is necessary to structurally enhance the sensitivity of the sensing fiber. However, most currently available enhanced fiber optic sensors are unsuitable for deployment and long-term use in industrial settings due to limitations such as exposed fiber optic cables being easily damaged, structural fragility, difficulties in mass production, and complex installation, failing to meet the needs of large-scale industrial applications.

[0004] In addition to operating sounds, the equipment also generates significant mechanical vibrations during operation. These vibrations typically have strong low-frequency components. Once the sensing unit comes into contact with these vibrations, they will significantly interfere with the detection of the sound signal, posing a challenge to the separation of the subsequent vibration and sound signals. Therefore, non-contact sound signal sensing can effectively avoid vibration interference. However, the quality of the sound signal decreases as the distance between the sensing unit and the equipment increases. Existing technologies mostly use uniform fiber optic sensing units for deployment, without differentiated optimization for the acoustic characteristics of different operating parts of the equipment. This results in redundancy or inadequacy in signal acquisition capabilities, making it difficult to achieve a balance between cost, performance, and applicability. Therefore, installing enhanced fiber optic acoustic sensors at key local nodes such as drive rollers, bearings, and transfer points, while deploying sensing optical cables in other locations to achieve long-distance, continuous coverage sound wave detection, is a combined detection method that balances deployment cost and local detection performance, effectively ensuring the safety and efficiency of equipment operation and maintenance. Summary of the Invention

[0005] To address the aforementioned technical problems, this utility model provides a combination device of uwDAS optical cable and audio box for equipment fault monitoring. This combination device enables long-distance, high-sensitivity detection of acoustic signals during equipment operation; it features high sensitivity, stable structure, flexible deployment, continuous coverage, distributed detection, and industrial adaptability.

[0006] The technical solution adopted by this utility model is as follows:

[0007] A uwDAS fiber optic cable and audio box assembly for equipment fault monitoring, the assembly comprising:

[0008] Sensor optical cable, audio box base, audio box spindle, audio box cover, sensor optical fiber;

[0009] The sensing fiber is tightly wound around the audio box spindle, and the audio box spindle is fixed to the audio box base;

[0010] The audio box base and audio box cover are assembled to form the audio box;

[0011] The sensing optical cable is connected to the sensing optical fiber inside the audio box, forming a combination device of optical cable and audio box.

[0012] The sensing optical cable is fused together with the sensing optical fiber inside the audio box, and multiple segments of sensing optical cable and multiple audio boxes can be connected in series.

[0013] Multiple segments of sensing optical cables and multiple audio boxes are arranged at equal intervals in a straight line.

[0014] The cores of the sensing optical cable and sensing optical fiber are engraved with multiple ultra-weak fiber gratings spaced 5 m apart.

[0015] The audio box base includes: an optical fiber fixing bracket, an optical fiber outlet hole, a cable tie hole, an inner wall, and a base substrate;

[0016] The audio box base includes a spindle fixing base with a spindle fixing screw hole. The audio box spindle is fixed to the spindle fixing base by aligning the screw with the spindle fixing screw hole.

[0017] The audio box base is equipped with an optical fiber outlet hole, a cable tie hole, and an optical fiber fixing bracket;

[0018] The sensing fiber is led out from the fiber optic outlet hole and aligned with the fiber optic fixing screw hole with a screw. The metal clamp holds and fixes the sensing fiber to the fiber optic fixing bracket. Cable ties pass through the cable tie hole to fix the audio box to the bracket near the device.

[0019] The fiber optic fixing bracket is a cuboid with 1 / 4 of a cylinder removed, and the center of the removed cylinder is aligned with the center of the fiber optic outlet hole.

[0020] The audio box spindle includes a supporting spindle and a foam sensitizing layer. One end face of the supporting spindle has a spindle mounting adjustment hole to facilitate the passage of the spindle fixing screw. The foam sensitizing layer is pasted on the surface of the supporting spindle, and the sensing optical fiber is tightly wound on the foam sensitizing layer with a certain prestress.

[0021] The audio box cover has a pickup hole on one front and a hole on each of the two sides that coincides with the optical fiber outlet hole of the audio box base. The audio box base is tightly embedded in the audio box cover to form an audio box.

[0022] The sensing fiber leading out of the fiber optic outlet can continue to be wound around the next audio box or fused with the next segment of sensing optical cable. The optical cable and audio box combination device is connected to the uwDAS demodulation device for monitoring the device's operating status.

[0023] The equipment health monitoring method based on the combination of optical cable and audio box involves the sound of the equipment operating acting on the sensing optical cable or audio box, causing deformation of the sensing optical cable or sensing fiber, thereby causing a phase change in the light in the fiber core. By demodulating this phase change, the sound of the equipment operating can be detected, and its operating status can be further monitored.

[0024] This utility model provides a combination device of uwDAS optical cable and audio box for equipment fault monitoring, with the following technical advantages:

[0025] 1) This utility model connects optical cables and audio boxes in series to detect the combined sound of equipment operation. By installing audio boxes in key parts of the equipment and laying optical cables in other parts, it achieves highly sensitive, low-cost, long-distance continuous monitoring of the operating status of the entire line equipment.

[0026] 2) The combination of fiber optic cable and audio box deployment retains the high sensitivity of the audio box in key areas, while making full use of the advantages of fiber optic cable deployment, which is flexible and can cover long distances. It takes into account both local precise sensing and overall monitoring of the entire line, effectively improving the practicality of the system and the feasibility of engineering implementation.

[0027] 3) The core and outer shell structure of the audio box allows sound waves to pass through the pickup hole and act directly on the core. The deformation of the core causes the optical fiber to deform, thereby improving the sensitivity. On the other hand, the outer shell effectively reflects the sound waves. The early reflected sound waves continue to act on the core, which to a certain extent enhances the sound wave signal received by the core and further improves the sensitivity.

[0028] 4) The audio box spindle employs a design where a supporting spindle is bonded to the outside with a foam sensitizing layer. The relatively rigid supporting spindle provides excellent mechanical stability for the audio box, effectively preventing structural deformation during long-term use, while simultaneously increasing the overall resonant frequency of the system and broadening its frequency response bandwidth. The outer foam sensitizing material, due to its low Young's modulus, can produce greater deformation under the same sound pressure level, thus significantly improving sensitivity. This structure not only balances strength and sensitivity but also offers advantages such as ease of processing and mass production, making it suitable for industrial production and engineering applications.

[0029] 5) The sensing optical cable and the square audio box embedded in the base and cover of this utility model can be fixed to the adjacent bracket of the conveyor belt using cable ties to achieve non-contact sound wave detection. This avoids the strong mechanical vibration interference caused by direct contact with the conveyor belt, effectively improving the purity of the sound wave signal detection. In addition, the embedded base and cover can effectively reduce the accumulation of environmental dust and other pollutants on the audio box. At the same time, the cable tie installation method is flexible, easy to construct, and quick to install.

[0030] 6) This utility model is not limited to fault detection of belt conveyors, but is applicable to health monitoring of various equipment, such as health monitoring of rail transit, pipeline leak detection, and health monitoring of bridge and tunnel structures. It allows for the rational allocation of the fiber optic cable and audio box deployment ratio and location according to different application scenarios, possessing good versatility and scalability. Attached Figure Description

[0031] The present invention will be further described below with reference to the accompanying drawings and examples;

[0032] Figure 1 This is a schematic diagram of the combined structure of the optical cable and audio box.

[0033] Figure 2 This is a schematic diagram of the audio box base structure.

[0034] Figure 3 This is a schematic diagram of the audio box spindle structure.

[0035] Figure 4 This is a schematic diagram of the audio box structure.

[0036] Figure 5 This is a schematic diagram of the sensing principle of a sensing optical cable / fiber.

[0037] Figure 6 This is a schematic diagram of the audio box frequency response testing device in Example 1.

[0038] Figure 7 This is a frequency response curve of the audio box and bare fiber ring in Example 1.

[0039] Figure 8 This is a schematic diagram of the fault location simulation system for the belt conveyor with the optical cable and audio box combination structure in Example 2.

[0040] Among them, 1-sensing optical cable, 2-audio box base, 3-audio box spindle, 4-audio box cover, 5-sensing optical fiber, 6-audio box, 7-optical cable and audio box combination device, 8-spindle fixing base, 9-fiber fixing bracket, 10-fiber outlet hole, 11-cable tie hole, 12-inner wall, 13-base substrate, 14-spindle fixing screw hole, 15-fiber fixing screw hole, 16-metal pressure plate, 17-supporting spindle, 18-foam sensitizing layer, 19-pickup hole;

[0041] 20-Laser pulse generator, 21-First circulator, 22-uwFBG, 23-Second circulator, 24-Faraday rotator, 25-3×3 coupler, 26-Photodetector, 27-Embedded circuit, 28-Computer, 29-uwDAS demodulation device, 30-Audio signal generator, 31-Sound pressure gauge, 32-Bare fiber ring, 33-Sound absorption box, 34-Shock-absorbing sponge, 35-Mandrel mounting adjustment hole. Detailed Implementation

[0042] like Figures 1-4 As shown, this utility model provides a uwDAS optical cable and audio box combination device for equipment fault monitoring. The device includes: a sensing optical cable 1, an audio box base 2, an audio box spindle 3, an audio box cover 4, and a sensing optical fiber 5.

[0043] The sensing optical cable 1, as shown in Figure 1 As shown, this is a vibrating optical cable with multiple 5-meter-spaced ultra-weak fiber gratings (uwFBGs) etched into its fiber core. The sensing fiber 5 is as follows... Figure 3 As shown, this is a vibrating optical fiber with multiple 5-meter spaced uwFBGs etched into its core. The sensing principle of sensing cable 1 and sensing optical fiber 5 is as follows: Figure 5As shown, a laser pulse generator 20, consisting of a narrowband laser (NLL), a semiconductor amplifier (SOA), and an erbium-doped fiber amplifier (EDFA), outputs an optical pulse signal. The optical pulse signal passes through a first circulator 21, is sequentially coupled into uwFBG 22, and a very small portion of the optical signal is reflected. The remaining optical pulse continues to propagate. The reflected optical signal is output from the first circulator 21, passes through a second circulator 23, and is coupled into a Faraday rotator 24 with an arm length difference equal to the distance between adjacent uwFBGs (5 m) for distance compensation. This causes the reflected optical signals from two adjacent uwFBGs 22 to interfere within a 3×3 coupler 25, resulting in three signal outputs that are received by a photodetector 26. The acquired signals are demodulated and calculated by an embedded circuit 27, and the processing results are displayed on a computer 28. Based on the sensing principle of uwFBG, when the optical fiber between two adjacent uwFBG 22 is subjected to external acoustic waves, stress, etc., it will cause a phase change in the pulse light within the optical fiber. Subsequent demodulation processing can quantitatively analyze the magnitude of this phase change, thereby determining the change in the physical quantity acting on the sensing optical fiber. Furthermore, the interference within the 3×3 coupler 25 occurs between the reflected light signals of the two adjacent uwFBG 22. The demodulated phase change is only related to the sensing optical fiber between these two uwFBG 22; that is, the optical fiber between two adjacent uwFBG 22 can be considered an independent sensing unit.

[0044] like Figure 2 As shown, the audio box base 2 is made of aluminum and includes a spindle fixing base 8, an optical fiber fixing bracket 9, an optical fiber outlet hole 10, a cable tie hole 11, an inner wall 12, and a base substrate 13. The core shaft fixing base 8 has a diameter of 75 mm. Four core shaft fixing screw holes 14 are evenly distributed 10 mm from the edge of the core shaft fixing base 8. The fiber optic fixing bracket 9 is 9 mm from the near end of the inner wall 12. It is a cuboid with a length of 20 mm, a width of 15 mm, and a height of 7.17 mm, with 1 / 4 of a cylinder with a diameter of 8 mm and a length of 15 mm cut out. The center of the cut-out cylinder is aligned with the center of the fiber optic outlet hole 10. The fiber optic fixing bracket 9 and the metal pressure plate 16 with a length of 20 mm, a width of 15 mm, and a height of 0.5 mm have aligned fiber optic fixing screw holes 15. There is a half-diameter fiber optic outlet hole 10 with a diameter of 8 mm on the inner wall 12. The cable tie hole 11 is 20 mm long and 5 mm wide, located in the middle of the two sides of the base plate 13. The inner wall 12 is 168 mm long, 99 mm wide, and 10 mm high. The base plate 13 is 174 mm long, 105 mm wide, and 15 mm high.

[0045] like Figure 3As shown, the audio box core 3 includes a supporting core 17 and a foam sensitizing layer 18. The supporting core 17 is made of plastic, with two end faces having a diameter of 75 mm, a frame diameter of 61 mm, and a height of 45 mm. One end face has a core mounting adjustment hole 35 that divides a 36 mm outer diameter, 27.5 mm inner diameter ring into four equal parts, facilitating rotational adjustment when fixing the supporting core 17. The foam sensitizing layer 18, adhered to the frame, is 5 mm thick, with a Young's modulus of approximately 16.5 MPa and a Poisson's ratio of approximately 0.35. Sensing optical fibers 5 are tightly wound onto the foam sensitizing layer 18 with a certain prestress. Each audio box core 3 has 10 m of sensing optical fiber 5 wound around it, ensuring that there are always two uwFBGs wound around each audio box core 3, making each audio box 6 an independent sensing unit.

[0046] like Figure 4 As shown, the audio box cover 4 is 170 mm long, 100 mm wide, and 48 mm high. It has 12 pickup holes 19 on one front side. Each pickup hole 19 is 5 mm long and 30 mm high. The distance between two adjacent pickup holes 19 is 5 mm. The distance between the pickup holes 19 at both ends and the edge of the audio box cover 4 is 20 mm. The audio box cover 4 has a hole with a diameter of 8 mm on each of its two sides as an optical fiber outlet hole 10, which coincides with the optical fiber outlet hole 10 on the inner wall 12.

[0047] like Figure 1 As shown, the optical cable and audio box assembly 7 is a structure that fuses the sensing optical cable 1 and the sensing optical fiber 5 inside the audio box 6 together. After the sensing optical fiber 5 of each audio box 6 is wound, it is clamped and fixed to the optical fiber fixing bracket 9 by the metal clamping plate 16, and led out from the optical fiber outlet hole 10. The audio box base 2 is tightly embedded in the audio box cover 4, forming the audio box 6. According to the testing requirements, the sensing optical fiber 5 led out from the optical fiber outlet hole 10 can continue to be wound into the next audio box 6 or fused with the sensing optical cable 1. The length of the sensing optical cable 1 is determined according to the testing requirements. Finally, one end of the optical cable and audio box assembly structure 7, the sensing optical cable 1 or the sensing optical fiber 5, is connected to the uwDAS demodulation device 29 to monitor the device's operating status.

[0048] The uwDAS demodulation device 29 is manufactured by Yichang Ruichuan Optoelectronic Technology Co., Ltd., and its model is RS-HFBGA-05. The laser emits light pulses along the optical fiber, which are reflected directionally at the grating position. After phase compensation, they interfere. This interference carries the sound wave vibration information along the route of the optical cable and audio box combination device 7. The frequency, phase and amplitude information of the signal are extracted by processing the collected data.

[0049] Performance testing device for audio box 6, such as Figure 6As shown, the system includes a uwDAS demodulation device 29, a computer 28, an audio signal generator 30, a sound pressure meter 31, a bare fiber ring 32, and an audio box 6. The bare fiber ring 32 serves as a control group for the audio box 6; the two are different grid points on the same optical fiber. During testing, the bare fiber ring 32 and the audio box 6 are placed on flat damping foam 34 and then placed together in a sound-absorbing box 33 to reduce interference from external vibrations and echoes. The sensing fiber 5 is connected to the uwDAS demodulation device 29, which is connected to the computer 28 to display the test signal in real time. The computer 28 drives the audio signal generator 30 to generate the required sound wave signal, which is then incident radially along the audio box 6. The sound pressure meter 31 is placed at the same sound pressure level as the audio box 6 for frequency response and other performance tests.

[0050] A belt conveyor fault location simulation system based on the optical cable and audio box combination device 7, such as... Figure 8 As shown, the system includes a uwDAS demodulation device 29, a computer 28, an audio signal generator 30, and an optical cable and audio box assembly 7. All optical cables and audio boxes 6 are arranged at equal intervals in a straight line. The audio signal generator 30 generates belt conveyor fault sounds to simulate the fault location. By analyzing the time difference of the fault sounds measured by different optical cables or audio boxes 6, the fault location is located in a two-dimensional plane. Taking the signals measured by three audio boxes 6 as an example, the specific location steps are as follows:

[0051] Step 1: The three audio boxes 6 are represented by M1, M2, and M3 respectively. Establish a coordinate system with M1 as the origin, and M2 and M3 located on the y-axis. Therefore, the coordinates of M2 are (0, ..., ...). d The coordinates of M3 are (0, 2). d ),in d The interval between adjacent audio boxes.

[0052] Step 2: Based on geometric relationships, we have the following system of equations:

[0053] ;

[0054] in: The speed of sound is usually taken as 343 m / s. The time difference between the signals measured by M1 and M2 The time difference between the signals measured by M1 and M3 x The x-coordinate of the fault point y The vertical coordinate of the fault point. This is for taking the absolute value.

[0055] Step 3: Solve the system of equations in Step 2 to obtain the location coordinates of the fault point. x , y ).

[0056] Through the above implementation methods, by tightly winding the sensing optical fiber 5 onto the audio box spindle 3 and fixing it to the base 2 of the audio box 6, the sensor's sensitivity is effectively enhanced, enabling efficient detection of minute sounds in key parts of the belt conveyor. At the same time, the detection method of the optical cable and audio box combination device 7 achieves highly sensitive, low-cost, long-distance continuous monitoring of the entire belt conveyor line's operating status, and can achieve accurate fault location, which has important application value in the field of industrial equipment health monitoring.

[0057] Example 1. Audio Box Frequency Response Experiment:

[0058] according to Figure 6 The test setup shown allows the audio signal generator 30 to generate sinusoidal signals within a frequency range of 100–2000 Hz. With a step size of 50 Hz, the phase information obtained by the computer 28 and the corresponding sound pressure level reading are recorded for each frequency. The ratio of phase to sound pressure level is the sound pressure sensitivity at that frequency. The sound pressure sensitivity curves of the bare fiber ring and audio box as a function of frequency are measured to obtain the frequency response curves, as shown below. Figure 7 As shown. By Figure 7 The average sound pressure sensitivity of the audio box and the bare fiber ring were found to be -117.6 dB re 1 rad / uPa and -138.6 dB re 1 rad / uPa, respectively, in the frequency range of 100~2000 Hz. The audio box structure proposed in this invention has greatly improved the sensitivity compared with the bare fiber ring, enhancing the system's ability to capture weak signals.

[0059] Example 2. Fault location experiment of belt conveyor with optical cable and audio box combination structure:

[0060] according to Figure 8 The belt conveyor fault location simulation system shown uses an audio signal generator 30 to output a belt conveyor fault sound to simulate a fault occurrence. The position of the audio signal generator 30 at this time is recorded as the true location of the fault occurrence point. Based on the signal time difference measured by different optical cables or audio boxes, the coordinates of the fault occurrence point are calculated as the estimated location. Similarly, by changing the position of the audio signal generator 30, the coordinates of the fault occurrence point are calculated each time, and the Euclidean distance between the true and estimated positions is used as the location error. Multiple experiments were conducted. Taking three audio boxes spaced 0.5 m apart as an example, the coordinates of the three audio boxes M1, M2, and M3 are (0, 0) m, (0, 0.5) m, and (0, 1) m, respectively. The fault location results are shown in Table 1.

[0061] Table 1 Fault Location Results

[0062]

[0063] As shown in Table 1, the average positioning error is approximately 0.1586 m. This error is comparable to the size of the audio box 6 and the audio signal generator 30, thus limiting the fault location to a small area during belt conveyor fault detection. However, the manual placement of the audio box 6 and the audio signal generator 30, along with their inherent volume, makes millimeter-level precision difficult to achieve in actual operation. This leads to unavoidable deviations in locating the actual coordinates, which are amplified during fault location, increasing the overall error. Furthermore, sound wave propagation is affected by multipath effects from reflections from walls and the ground, interfering with the calculation of the time difference of sound wave arrival between the audio boxes 6 and also impacting positioning accuracy. In practical engineering applications, more standardized installation and location calibration methods, along with anti-interference algorithm design, can further improve positioning accuracy.

Claims

1. A combination device for uwDAS optical cable and audio box for equipment fault monitoring, characterized in that... The device includes: Sensing optical cable (1), audio box base (2), audio box spindle (3), audio box cover (4), sensing optical fiber (5); The sensing fiber (5) is tightly wound on the audio box spindle (3), and the audio box spindle (3) is fixed on the audio box base (2); The audio box base (2) and the audio box cover (4) are assembled to form the audio box (6); The sensing optical cable (1) is connected to the sensing optical fiber (5) inside the audio box (6) to form a combination device (7) of optical cable and audio box.

2. The uwDAS optical cable and audio box combination device for equipment fault monitoring according to claim 1, characterized in that: The sensing optical cable (1) is fused together with the sensing optical fiber (5) in the audio box (6), and multiple segments of sensing optical cable (1) and multiple audio boxes (6) can be connected in series.

3. The uwDAS optical cable and audio box combination device for equipment fault monitoring according to claim 1, characterized in that: The cores of the sensing optical cable (1) and the sensing optical fiber (5) are engraved with multiple ultra-weak fiber gratings spaced 5 m apart.

4. The uwDAS optical cable and audio box combination device for equipment fault monitoring according to claim 1, characterized in that: The audio box base (2) includes a spindle fixing base (8), and the spindle fixing base (8) is provided with a spindle fixing screw hole (14). The audio box spindle (3) is fixed on the spindle fixing base (8).

5. The uwDAS optical cable and audio box combination device for equipment fault monitoring according to claim 4, characterized in that: The audio box base (2) is provided with an optical fiber outlet hole (10), a cable tie hole (11), and an optical fiber fixing bracket (9). The sensing fiber (5) is led out from the fiber outlet hole (10), and the metal clamp (16) clamps and fixes the sensing fiber (5) on the fiber fixing bracket (9); the cable tie passes through the cable tie hole (11) to fix the audio box (6) near the device.

6. The uwDAS optical cable and audio box combination device for equipment fault monitoring according to claim 1, characterized in that: The audio box core (3) includes a support core (17) and a foam sensitizing layer (18). One end face of the support core (17) has a core mounting adjustment hole (35). The foam sensitizing layer (18) is pasted on the surface of the support core (17), and the sensing optical fiber (5) is tightly wound on the foam sensitizing layer (18) with a certain prestress.

7. The uwDAS optical cable and audio box combination device for equipment fault monitoring according to claim 1, characterized in that: The audio box cover (4) has a pickup hole (19) on one side and a hole on each of the other two sides that coincides with the optical fiber outlet hole (10) of the audio box base (2). The audio box base (2) is embedded in the audio box cover (4) to form an audio box (6).

8. The uwDAS optical cable and audio box combination device for equipment fault monitoring according to claim 5, characterized in that: The sensing fiber (5) leading out from the fiber optic outlet (10) can continue to be wound around the next audio box (6) or fused with the next segment of sensing optical cable. The optical cable and audio box combination device (7) is connected to the uwDAS demodulation device (29) for monitoring the operating status of the device.

9. The uwDAS optical cable and audio box combination device for equipment fault monitoring according to claim 5, characterized in that: The fiber optic fixing bracket (9) is a cuboid with 1 / 4 of a cylinder removed, and the center of the removed cylinder is aligned with the center of the fiber optic outlet hole (10).

10. The uwDAS optical cable and audio box combination device for equipment fault monitoring according to claim 2, characterized in that: Multiple sensing optical cables (1) and multiple audio boxes (6) are arranged at equal intervals in a straight line.

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