A high-sensitivity fiber-optic sensor and a distributed vibration detection system

Abstract

The application provides a high-sensitivity optical fiber sensor and a distributed vibration detection system, and relates to the technical field of optical fiber sensors.The high-sensitivity optical fiber sensor comprises a sensor and a transparent plastic pipe, the right side of the sensor is fixedly connected with an optical fiber one, the outer wall of the upper part of the transparent plastic pipe is provided with a threaded wall, the threaded wall is threadedly connected with a hollow transparent pipe, and the outer wall of the upper part of the hollow transparent pipe is fixedly connected with four sliding rod groups at equal intervals.A hollow sliding ring is rotated, a pressing type infusion air bag is used to paste and fix colloid coating, the elastic potential energy of springs one and two is used to drive the hollow rod and the pressing rod to be extruded and fixed, the bending between optical fibers is avoided, the influence on the sensitivity of the sensor is avoided, different modules are matched, distributed vibration signals are detected, and then a signal amplifier and a signal analyzer are matched, so that the sensitivity of the sensor is improved, and the use requirement is better met.

Description

Technical Field

[0001] This invention relates to the field of fiber optic sensor technology, specifically to a high-sensitivity fiber optic sensor and a distributed vibration detection system. Background Technology

[0002] An optical fiber sensor is a sensor that converts the state of the object being measured into a measurable optical signal. The working principle of an optical fiber sensor is to send the incident light beam from the light source into a modulator through an optical fiber. In the modulator, the interaction with the external measured parameters causes changes in the optical properties of the light, such as the intensity, wavelength, frequency, phase, and polarization state, becoming a modulated optical signal. This signal is then sent through an optical fiber to an optoelectronic device and demodulated to obtain the measured parameters. In the whole process, the light beam is guided through the optical fiber, passes through the modulator, and is then emitted. The role of the optical fiber is first to transmit the light beam, and secondly to act as an optical modulator.

[0003] The brand of optical fiber is synonymous with its quality. The quality of the optical fiber directly affects the sensitivity of the optical fiber sensor, which is the most critical factor. The core diameter of the optical fiber determines the precision of the optical fiber sensing. The larger the core diameter, the wider the detection range. However, for manufacturers requiring precision, the smaller the core diameter, the shorter the optical fiber sensing distance, the smaller the measurement range, and the higher the accuracy. It is also less susceptible to interference from related impurities. The angle of the optical fiber's bend also affects the sensing sensitivity.

[0004] When installing and using existing fiber optic sensors, the fiber optic cables need to be bent due to varying terrain, environment, and site conditions. Prolonged bending of the fiber optic cables can cause them to lose their original position, and the angle of bending can also affect the sensitivity of the sensor. Furthermore, in some special situations where fiber optic sensors operate solely through optical signals, the sensitivity is still not high enough to meet more application requirements. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a high-sensitivity fiber optic sensor and a distributed vibration detection system. It solves the problems that prolonged bending of the fiber optic cable can cause it to fail to return to its original position, that bending angles can affect the sensitivity of the sensor, and that in some special situations, the sensitivity of the fiber optic sensor is still not high enough when operating solely through optical signals, thus failing to meet a wider range of application requirements.

[0006] In order to achieve the above object, the present application is realized by the following technical scheme: a high-sensitivity optical fiber sensor, comprising a sensor and a transparent plastic tube, the right side of the sensor is fixedly connected with an optical fiber one, the outer wall of the upper part of the transparent plastic tube is provided with a threaded wall, the threaded wall is threadedly connected with a hollow transparent tube, the outer wall of the upper part of the hollow transparent tube is fixedly connected with four sliding rod groups at equal intervals, the sliding rod groups are provided with arc-shaped sliding blocks, the side of the arc-shaped sliding blocks close to the hollow transparent tube is fixedly connected with a hollow rod, the inner wall of the arc-shaped sliding blocks is fixedly connected with a spring one in the middle part, the end of the spring one is fixedly connected with the outer wall of the hollow rod, the inner wall of one end of the hollow rod is fixedly connected with a spring two, the other end of the spring two is fixedly connected with a pressing rod, the left bottom of the transparent plastic tube is communicated with a plastic transparent tube, the inner side of the left end of the plastic transparent tube is rotatably connected with a hollow sliding ring, the outer wall of the left end of the plastic transparent tube is provided with arc-shaped sliding grooves on the upper and lower sides, the outer wall of the hollow sliding ring is communicated with two pressing type infusion air bags at equal intervals, the top end of the pressing type infusion air bag penetrates through the arc-shaped sliding groove, and the output end of the pressing type infusion air bag penetrates through the hollow sliding ring.

[0007] Preferably, the right end of the optical fiber one penetrates through the hollow sliding ring and the plastic transparent tube in sequence, and the end of the sliding rod group away from the hollow transparent tube is fixedly connected with a limiting block.

[0008] Preferably, the end of the pressing rod is fixedly connected with a pressing plate, the middle part of the hollow transparent tube is provided with an optical fiber two, and the side of the pressing plate close to the optical fiber two is provided with a plurality of inner grooves.

[0009] Preferably, a distributed vibration detection system of a high-sensitivity optical fiber sensor, comprising a data acquisition module, a signal amplification module, a signal acquisition module, a signal analysis module, an upper computer, a reference optical fiber module and a pattern recognition module;

[0010] The output end of the signal acquisition module is electrically connected with the input end of the reference optical fiber module and the signal amplification module respectively, the output end of the signal amplification module is electrically connected with the input end of the data acquisition module, the output end of the upper computer is electrically connected with the input end of the data acquisition module and the reference optical fiber module respectively, the output end of the signal analysis module is electrically connected with the input end of the upper computer, and the output end of the pattern recognition module is electrically connected with the input end of the signal analysis module.

[0011] Preferably, the signal acquisition module is composed of a signal receiving unit, a central processing unit and a signal transmission unit, the signal receiving unit is to collect signals from all directions, the central processing unit is to decode and process the collected signals, and the signal transmission unit is to transport the processed signals.

[0012] Preferably, the data acquisition module is composed of a network unit, a digital output unit and a digital input unit, the network unit is a medium for transmission by Ethernet, the digital output unit is for digital encryption and transmission of data, and the digital input unit is for data reception and processing.

[0013] Preferably, the signal amplification module is composed of a signal detection unit and a signal amplifier, the signal detection unit detects the intensity of the nearby signal, and the signal amplifier amplifies the input signal to infinity and then outputs.

[0014] Preferably, the signal analysis module includes a signal analyzer, which selects the signal to be analyzed, can accept a numerical array with inherent time information and a signal, can edit the signal through clipping, clipping, splitting, extracting or cropping operations, and can explore the signal and share the analysis results.

[0015] Preferably, the host computer is a computer or a single-chip microcomputer that can directly send operation instructions, and generally provides a user operation interactive interface and shows feedback data to the user.

[0016] Preferably, the reference optical fiber module is composed of different types of optical fibers, and the results of different types of optical fibers are compared and referenced, the pattern recognition module is composed of a sample feature storage unit and a technical processing unit, the sample feature storage unit stores the sample features of the past, and can query new sample features through the network, and the technical processing unit identifies and distinguishes the new sample according to the stored sample features, and is classified into a specific category.

[0017] Working principle: by adding a colloid in the pressing type infusion air bag, inserting optical fiber one into the inside of the hollow transparent tube, cooperating with the rotation of the hollow sliding ring, the pressing type infusion air bag is coated with the colloid on the outer wall of optical fiber one and the transparent plastic tube is fixed by pasting, then optical fiber two is inserted from the top of the transparent plastic tube, cooperating with the threaded connection of the hollow transparent tube on the threaded wall, the elastic potential energy of spring one and spring two drives the hollow rod and the pressing rod to stretch and contract to fix optical fiber two, so as to avoid the bending between the optical fibers, which is suitable for various different places, environments and places, avoids affecting the sensitivity of the sensor, and cooperates with the mode recognition module, the reference optical fiber module, the host computer, the signal acquisition module, the signal analysis module, the signal amplification module and the data acquisition module to detect the distributed vibration signal, and then cooperates with the signal amplifier and the signal analyzer, so as to improve the sensitivity of the sensor and meet the use demand more.

[0018] The application provides a high-sensitivity optical fiber sensor and a distributed vibration detection system.

[0019] 1. The present application adds a colloid in the pressing type infusion air bag, inserts an optical fiber one into the inside of a hollow transparent tube, cooperates the rotation of the hollow slide ring, makes the pressing type infusion air bag paste and fix the colloid on the outer wall of the optical fiber one and the transparent plastic tube, inserts an optical fiber two from the top of the transparent plastic tube, cooperates the hollow transparent tube to screw on the screw wall and move up and down, makes the spring one and the spring two drive the hollow rod and the pressing rod to stretch and contract to fix the optical fiber two, thereby avoiding the bending between the optical fibers, and is suitable for various different places, environments and places, and avoids affecting the sensitivity of the sensor.

[0020] 2. The present application cooperates the mode recognition module, the reference optical fiber module, the upper computer, the signal acquisition module, the signal analysis module, the signal amplification module and the data acquisition module to detect the distributed vibration signal, and cooperates the signal amplifier and the signal analyzer, thereby improving the sensitivity of the sensor and meeting the use demand. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the front view of the present application;

[0022] Figure 2 It is the enlarged view of A of the present application;

[0023] Figure 3 It is the top view of the partial structure of the present application;

[0024] Figure 4 It is the partial structure split drawing of the present application;

[0025] Figure 5 It is the three-dimensional partial structure split drawing of the present application;

[0026] Figure 6 It is the system framework drawing of the present application.

[0027] 1. sensor; 2. optical fiber one; 3. transparent plastic tube; 4. screw wall; 5. hollow transparent tube; 6. optical fiber two; 7. plastic transparent tube; 8. arc-shaped slide groove; 9. hollow slide ring; 10. pressing type infusion air bag; 11. sliding rod group; 12. arc-shaped slide block; 13. hollow rod; 14. pressing rod; 15. spring one; 16. spring two; 17. pressing plate; 18. limiting block; 19. inner groove. DETAILED DESCRIPTION

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0029] like Figures 1-6 As shown, this embodiment of the invention provides a high-sensitivity fiber optic sensor, including a sensor 1 and a transparent plastic tube 3. An optical fiber 2 is fixedly connected to the right side of the sensor 1. A threaded wall 4 is provided in the upper middle part of the outer wall of the transparent plastic tube 3. A hollow transparent tube 5 is threaded onto the threaded wall 4. Four sliding rod groups 11 are fixedly connected at equal intervals in the upper middle part of the outer wall of the hollow transparent tube 5. An arc-shaped slider 12 is provided on each sliding rod group 11. A hollow rod 13 is fixedly connected to the side of the arc-shaped slider 12 near the hollow transparent tube 5. A spring 15 is fixedly connected to the middle of the inner wall of the arc-shaped slider 12. The end of the tube is fixedly connected to the outer wall of the hollow rod 13. One end of the inner wall of the hollow rod 13 is fixedly connected to a spring 16, and the other end of the spring 16 is fixedly connected to a pressing rod 14. The bottom left side of the transparent plastic tube 3 is connected to a plastic transparent tube 7. The inner left end of the plastic transparent tube 7 is rotatably connected to a hollow slip ring 9. The upper and lower sides of the left side of the outer wall of the plastic transparent tube 7 are provided with arc-shaped grooves 8. The outer wall of the hollow slip ring 9 is equidistantly connected to two pressing infusion air bags 10. The top of the pressing infusion air bag 10 passes through the arc-shaped groove 8, and the output end of the pressing infusion air bag 10 passes through the hollow slip ring 9.

[0030] By adding colloid to the press-type infusion airbag 10, optical fiber 12 is inserted into the hollow transparent tube 5. With the rotation of the hollow slip ring 9, the press-type infusion airbag 10 applies colloid to the outer wall of optical fiber 12 and attaches it to the transparent plastic tube 3. Then, optical fiber 26 is inserted from the top of the transparent plastic tube 3. With the hollow transparent tube 5 moving up and down on the threaded wall 4, the elastic potential energy of spring 15 and spring 26 drives the hollow rod 13 and the pressing rod 14 to stretch and compress the optical fiber 26, thereby avoiding bending between the optical fibers. This method is suitable for various sites, environments and locations, and avoids affecting the sensitivity of the sensor.

[0031] The right end of fiber optic cable 12 passes through hollow slip ring 9 and plastic transparent tube 7 in sequence, and the end of sliding rod assembly 11 away from hollow transparent tube 5 is fixedly connected to limit block 18.

[0032] The light fiber two 6 is connected into the transparent tube 7 through the light fiber one 2, avoiding the bending of the whole light fiber to reduce the sensitivity of the sensor, and the limiting block 18 is installed on the sliding rod group 11, avoiding the reverse shooting of the arc-shaped sliding block 12 under the reverse elastic potential force of the spring one 15 and the spring two 16, causing the arc-shaped sliding block 12 to fall off.

[0033] The end of the pressing rod 14 is fixedly connected with a pressing plate 17, the middle part of the hollow transparent tube 5 is provided with the light fiber two 6, and the side close to the light fiber two 6 of the pressing plate 17 is provided with a plurality of inner grooves 19.

[0034] The pressing plate 17 is installed at the end of the pressing rod 14, avoiding the damage of the pressing rod 14 directly contacting the light fiber two 6, and the plurality of inner grooves are arranged on the pressing plate 17, so that the friction between the light fiber two 6 and the pressing plate 17 is increased, and the fixing effect is enhanced.

[0035] A distributed vibration detection system of a high-sensitivity optical fiber sensor, comprising a data acquisition module, a signal amplification module, a signal acquisition module, a signal analysis module, a host computer, a reference optical fiber module and a pattern recognition module;

[0036] The output end of the signal acquisition module is electrically connected with the input end of the reference optical fiber module and the signal amplification module, the output end of the signal amplification module is electrically connected with the input end of the data acquisition module, the output end of the host computer is electrically connected with the input end of the data acquisition module and the reference optical fiber module, the output end of the signal analysis module is electrically connected with the input end of the host computer, and the output end of the pattern recognition module is electrically connected with the input end of the signal analysis module.

[0037] The signal acquisition module is composed of a signal receiving unit, a central processing unit and a signal transmission unit, the signal receiving unit is for omnidirectional collection of signal sources, the central processing unit is for decoding and other processing work of the collected signals, and the signal transmission unit is for conveying the processed signals.

[0038] The signal receiving unit, the central processing unit and the signal transmission unit are integrated for receiving, processing and conveying the signals, so as to accelerate the speed of the signals and improve the efficiency of signal processing.

[0039] The data acquisition module is composed of a network unit, a digital output unit and a digital input unit, the network unit is a medium for transmission by using Ethernet, the digital output unit is for digital encryption and transmission of data, and the digital input unit is for receiving and processing data.

[0040] The digital output unit and the digital input unit receive and transmit the data by digital encryption under the action of the Ethernet medium.

[0041] The signal amplification module is composed of a signal detection unit and a signal amplifier, the signal detection unit detects the intensity of the nearby signal, and the signal amplifier amplifies the input signal to infinity and then outputs it.

[0042] The signal detection unit detects the signal of the accessory, and the signal amplifier amplifies the signal, so as to facilitate the transmission of the signal, improve the efficiency and the sensitivity of the sensor.

[0043] The signal analysis module includes a signal analyzer, which selects the signal to be analyzed, can provide a numerical array with inherent time information and signal, can edit the signal through trimming, clipping, splitting, extracting or cropping operations, and can also explore the signal and share the analysis results.

[0044] The signal analyzer edits the signal to be analyzed through trimming, clipping, splitting, extracting or cropping operations, and also shares the explored signal and results.

[0045] The host computer is a computer or single-chip microcomputer that can directly send operation instructions, generally provides a user operation interactive interface and shows feedback data to the user.

[0046] The host computer shows feedback data to the user in a data form, so that the operator can perform the next processing operation according to the feedback information.

[0047] The reference optical fiber module is composed of different types of optical fibers, and the results of different types of optical fibers are compared and referenced. The pattern recognition module is composed of a sample feature storage unit and a technical processing unit. The sample feature storage unit stores the sample features of the past, and can also query new sample features on the network. The technical processing unit identifies and distinguishes the stored sample features from new samples, and is classified into a specific category.

[0048] The reference optical fiber module can select the most suitable optical fiber for the environment, better meet different use requirements, and the sample feature storage unit stores different sample features, and the technical processing unit analyzes and compares the stored samples and new samples, so as to classify.

[0049] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A high-sensitivity fiber optic sensor, comprising a sensor (1) and a transparent plastic tube (3), characterized in that: The sensor An optical fiber (2) is fixedly connected to the right side of the device (1). A threaded wall (4) is provided in the upper middle part of the outer wall of the transparent plastic tube (3). A hollow transparent tube (5) is threaded onto the threaded wall (4). Four sliding rod groups (11) are fixedly connected at equal intervals in the upper middle part of the outer wall of the hollow transparent tube (5). An arc-shaped slider (12) is provided on the sliding rod group (11). A hollow rod (13) is fixedly connected to the side of the arc-shaped slider (12) near the hollow transparent tube (5). A spring (15) is fixedly connected to the middle of the inner wall of the arc-shaped slider (12). The end of the spring (15) is fixedly connected to the outer wall of the hollow rod (13). A spring (16) is fixedly connected to one end of the inner wall of the hollow rod (13). A pressing rod (14) is fixedly connected to the other end of the spring (16). The transparent plastic... A plastic transparent tube (7) is connected to the bottom left side of the tube (3). A hollow slip ring (9) is rotatably connected to the left inner side of the plastic transparent tube (7). An arc-shaped groove (8) is provided on the upper and lower sides of the left side of the outer wall of the plastic transparent tube (7). Two press-type infusion airbags (10) are equidistantly connected to the outer wall of the hollow slip ring (9). The top of the press-type infusion airbag (10) passes through the arc-shaped groove (8). The output end of the press-type infusion airbag (10) passes through the hollow slip ring (9). The right end of the first optical fiber (2) passes through the hollow slip ring (9) and the plastic transparent tube (7) in sequence. A press plate (17) is fixedly connected to the end of the press rod (14). An optical fiber (6) is provided in the middle of the hollow transparent tube (5). Multiple inner grooves (19) are provided on the side of the press plate (17) near the second optical fiber (6).

2. The high-sensitivity fiber optic sensor according to claim 1, characterized in that: The sliding rod assembly (11) is fixedly connected to a limit block (18) at the end away from the hollow transparent tube (5).

3. A distributed vibration detection system using a high-sensitivity fiber optic sensor, characterized in that: The high-sensitivity fiber optic sensor described in any one of claims 1-2 includes a data acquisition module, a signal amplification module, a signal acquisition module, a signal analysis module, a host computer, a reference fiber optic module, and a pattern recognition module. The output of the signal acquisition module is electrically connected to the input of the reference fiber optic module and the signal amplification module, respectively. The output of the signal amplification module is electrically connected to the input of the data acquisition module. The output of the host computer is electrically connected to the input of the data acquisition module and the reference fiber optic module, respectively. The output of the signal analysis module is electrically connected to the input of the host computer. The output of the pattern recognition module is electrically connected to the input of the signal analysis module.

4. The distributed vibration detection system using a high-sensitivity fiber optic sensor according to claim 3, characterized in that: The signal acquisition module consists of a signal receiving unit, a central processing unit, and a signal transmission unit. The signal receiving unit collects signals from all directions, the central processing unit decodes the collected signals, and the signal transmission unit transmits the processed signals.

5. The distributed vibration detection system using a high-sensitivity fiber optic sensor according to claim 3, characterized in that: The data acquisition module consists of a network unit, a digital output unit, and a digital input unit. The network unit uses Ethernet as the transmission medium, the digital output unit digitizes and encrypts the data before transmission, and the digital input unit receives and processes the data.

6. The distributed vibration detection system using a high-sensitivity fiber optic sensor according to claim 3, characterized in that: The signal amplification module consists of a signal detection unit and a signal amplifier. The signal detection unit detects the intensity of nearby signals, and the signal amplifier amplifies the input signal before outputting it.

7. The distributed vibration detection system using a high-sensitivity fiber optic sensor according to claim 3, characterized in that: The signal analysis module includes a signal analyzer, which selects the signal to be analyzed, can receive numerical arrays and signals with inherent time information, and can edit the signal by performing operations such as trimming, clipping, splitting, extracting or cropping. At the same time, it can explore the signal and share the analysis results.

8. A distributed vibration detection system using a high-sensitivity fiber optic sensor according to claim 3, characterized in that... The host computer is a computer or microcontroller that can directly send operation commands. It generally provides a user interface and displays feedback data to the user.

9. A distributed vibration detection system using a high-sensitivity fiber optic sensor according to claim 3, characterized in that: The reference fiber module is composed of different types of optical fibers, and the results of different types of optical fibers are compared and referenced. The pattern recognition module is composed of a sample feature storage unit and a technical processing unit. The sample feature storage unit stores the features of previous samples and can also query new sample features through the network. The technical processing unit identifies and distinguishes new samples based on the stored sample features, thereby classifying them into a specific category.

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