CN113639845B - Optical fiber vibration sensor, system and method - Google Patents
Optical fiber vibration sensor, system and method Download PDFInfo
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- CN113639845B CN113639845B CN202110804180.9A CN202110804180A CN113639845B CN 113639845 B CN113639845 B CN 113639845B CN 202110804180 A CN202110804180 A CN 202110804180A CN 113639845 B CN113639845 B CN 113639845B
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 7
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- 238000003825 pressing Methods 0.000 claims description 18
- 238000004806 packaging method and process Methods 0.000 claims description 16
- 239000000853 adhesive Substances 0.000 claims description 5
- 230000001070 adhesive effect Effects 0.000 claims description 5
- 239000000835 fiber Substances 0.000 claims 5
- 238000012544 monitoring process Methods 0.000 abstract description 9
- 230000003287 optical effect Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 230000008859 change Effects 0.000 description 5
- 230000001133 acceleration Effects 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 4
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- 230000000694 effects Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 229910000530 Gallium indium arsenide Inorganic materials 0.000 description 2
- 229910000617 Mangalloy Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 1
- 229910000906 Bronze Inorganic materials 0.000 description 1
- 229910052790 beryllium Inorganic materials 0.000 description 1
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 description 1
- 238000009395 breeding Methods 0.000 description 1
- 230000001488 breeding effect Effects 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
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- 230000004927 fusion Effects 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
- G01H9/006—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors the vibrations causing a variation in the relative position of the end of a fibre and another element
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The invention discloses an optical fiber vibration sensor, a system and a method, wherein the optical fiber vibration sensor comprises: the elastic piece is provided with a first connecting part, a second connecting part and a third connecting part, and the second connecting part is positioned between the first connecting part and the third connecting part; the first fixing device is used for fixing the elastic sheet at the first connecting part; the second fixing device is used for adjusting the second fixing device to be positioned at different positions in the length direction of the elastic sheet; the initial balancing weight is fixed at the third connecting part of the elastic sheet; the sensing optical fiber is provided with a first fixed node fixedly connected with the first fixing device and a second fixed node fixedly connected with the initial balancing weight; the sensing optical fiber can vibrate up and down synchronously along with the initial balancing weight at the second fixed node. The optical fiber vibration sensor can flexibly tune the response frequency bandwidth, the resonant frequency and the sensitivity of the vibration sensor, and further can meet different monitoring requirements of various structures or devices through a single sensor system.
Description
Technical Field
The invention relates to an optical fiber vibration sensor device with tunable sensitivity and response frequency, which is used for distributed long-term real-time online monitoring of vibration of various industrial equipment and engineering structures, and can realize vibration monitoring of a single set of equipment under different engineering application environments through tuning of the sensitivity and the response frequency.
Background
Vibration monitoring of various industrial equipment and engineering structures in a complex environment is easy to be influenced by environment, noise, characteristic frequency and the like, so that the parameter requirements of sensors for monitoring are different, and a single type of sensor is difficult to meet or adapt to the requirements of different engineering or working conditions. The traditional electric sensor represented by the piezoelectric acceleration sensor in the existing sensor has the characteristics of wide measurement frequency band and large sensitivity range; however, a great deal of researches and engineering practice prove that the traditional electric sensor has poor survivability, stability, durability and anti-interference capability in electromagnetic and humid complex environments, and can not meet the engineering requirements of long-term monitoring of the structure. In recent years, a new optical fiber acceleration sensing technology represented by an optical fiber grating has been rapidly developed, and the optical fiber acceleration sensing technology can overcome the defects of an electric sensor, has strong anti-interference capability, and can be used for other severe conditions such as high voltage, corrosion and the like; however, at present, various optical fiber sensors have the defects of fixed sensitivity, narrow response frequency, high cost, limited functions and poor applicability, and are difficult to meet or adapt to the application requirements of different industries or engineering.
Disclosure of Invention
The invention aims to provide an optical fiber vibration sensor, a system and a method with tunable sensitivity and response frequency, which can realize flexible tuning of the measuring frequency bandwidth and sensitivity of the sensor, and have the advantages of wide application range, strong engineering applicability, distributed property, good durability and weather resistance, high stability, repeatability and sensitivity, wide measuring frequency spectrum, simple system structure and low cost.
The technical scheme of the invention is as follows:
An optical fiber vibration sensor, comprising:
The elastic piece is provided with a first connecting part, a second connecting part and a third connecting part, and the second connecting part is positioned between the first connecting part and the third connecting part;
The first fixing device is used for fixing the elastic sheet at the first connecting part;
The second fixing device is used for fixing the elastic sheet at the second connecting part; the second fixing device is an adjustable fixing device and is used for adjusting the second fixing device to be positioned at different positions in the length direction of the elastic sheet;
the initial balancing weight is fixed at the third connecting part of the elastic sheet;
the sensing optical fiber is provided with a first fixed node fixedly connected with the first fixing device and a second fixed node fixedly connected with the initial balancing weight; the sensing optical fiber can vibrate up and down synchronously along with the initial balancing weight at the second fixed node.
The first fixing device comprises an elastic piece placing block and an elastic piece pressing block, and the first connecting part of the elastic piece is located between the elastic piece placing block and the elastic piece pressing block.
A limiting clamping groove is formed in the upper surface of the elastic piece placing block; the elastic sheet is positioned in the clamping groove.
The second fixing device comprises a tuning slide block and a sliding clamping nut.
The tuning sliding block comprises a middle beam and a bottom beam, and the sliding clamping nut is arranged between the middle beam and the bottom beam; the elastic sheet is positioned between the middle beam and the sliding clamping nut and is fixed on the lower surface of the middle beam by the sliding clamping nut.
The third connecting part is further provided with a variable balancing weight series, the variable balancing weight series is connected to the lower end of the balancing weight nut, and the balancing weight of the variable balancing weight series is increased according to the requirements of sensitivity and response frequency bandwidth.
The elastic sheet, the first fixing device, the second fixing device and the initial balancing weight are all arranged in a packaging shell; and the packaging shell is provided with a hole for the sensing optical fiber to penetrate in and out, and the sensing optical fiber is fixedly connected with the initial balancing weight and the first fixing device in the packaging shell through the hole for the sensing optical fiber to penetrate in and out.
The sensing optical fiber is bonded with the initial balancing weight and the first fixing device by high-strength structural adhesive.
An optical fiber vibration sensing system is characterized in that the optical fiber vibration sensor is adopted.
The optical fiber vibration sensing method is characterized in that the optical fiber vibration sensor is adopted to acquire vibration signals.
Compared with the prior art, the invention has the following technical effects:
The optical fiber vibration sensor is used for realizing the vibration monitoring of a single set of equipment which can be adapted to or used in different engineering application environments, and can flexibly tune the response frequency bandwidth, the resonance frequency and the sensitivity of the vibration sensor through the vibration length variable elastic sheet design and the variable counterweight structure based on the movable sliding block, so that different monitoring requirements of various structures or equipment can be met through a single set of sensor system, and the optical fiber vibration sensor can be further applied to the wide engineering field.
The sensing optical fiber used by the optical fiber sensor is a single-mode optical fiber-thermal expansion beam gradient refractive index multimode optical fiber-single-mode optical fiber structure. The sensor has the advantages of being capable of realizing flexible tuning of the measuring frequency bandwidth and the sensitivity of the sensor, wide in application field range, strong in engineering applicability, meanwhile, distributed, durable, good in weather resistance, high in stability, repeatability and sensitivity, wide in measuring frequency spectrum, simple in system structure, low in cost, wide in application range and the like.
Drawings
FIG. 1 is a system connection diagram of the present invention.
Fig. 2 is a schematic diagram of the overall structure of a tunable vibration sensor according to the present invention.
Fig. 3 is a schematic diagram of a sensing principle of the present invention.
Fig. 4 is a schematic diagram of a structure of tuning response frequency and sensitivity by the adjustable spring 9 according to the present invention.
Fig. 5 is a schematic diagram of a structure of the invention for tuning response frequency and sensitivity with different counterbalance masses.
Fig. 6 is a graph of experimental results of tuning response frequency by the adjustable spring 9.
Fig. 7 is a graph of experimental results of tuning response frequencies by different counterweight masses.
Fig. 8 is a diagram of the experimental result of tuning sensitivity in a partial frequency band by the adjustable spring plate 9.
Fig. 9 is a graph of experimental results of tuning sensitivity at a partial frequency band by different counterweight masses.
Fig. 10 is a schematic diagram of a multi-channel-embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the attached drawings, but should not be construed as limiting the scope of the invention.
Embodiments of the present system are described in detail below in conjunction with fig. 1-5.
As shown in fig. 1, the optical fiber vibration sensing system comprises a laser diode 1, a vibration sensor 2, a photoelectric detector 3, a data acquisition card 4, a signal analysis processing part 5 and a computer 6. The connection relation of each component is as follows: the output end of the laser diode 1 is connected with the input end of the vibration sensor 2, and the output end of the optical fiber vibration sensor 2 is connected with the input end of the photoelectric detector 3; the three devices are connected in series to form a vibration signal sensing detection channel, and the output end of the photoelectric detector 3 is sequentially connected in series with a multichannel data acquisition card 4, a signal analysis and processing system 5 and a computer 6 for display. The laser diode 1 emits light to enter the vibration sensor 2, and self-focusing in the thermal beam expansion gradient refractive index multimode optical fiber is destroyed, so that optical signals of multiple propagation modes are generated, and the multiple modes interfere with each other due to different optical path differences; when a vibration signal acts on the optical fiber vibration sensor 2, the vibration causes the multimode optical fiber to bend, so that the interference state is changed, and when the vibration signal is output from the vibration sensor 2, the change generated by the intensity of the optical signal corresponds to the vibration frequency; then the optical signal enters the photoelectric detector 3, the electric signal output by the optical signal after passing through the photoelectric detector 3 is collected by the multichannel data collection card 4, then the signal is analyzed by the signal analysis processing part 5, the real-time change of the vibration signal contained in the electric signal is obtained, and then the electric signal is displayed by the computer 6.
The laser diode 1 adopts a coaxial non-isolation FP cavity laser diode; the photodetector 3 is an indium gallium arsenic PIN photodetector.
The structure of the optical fiber vibration sensor is shown in fig. 2, and comprises:
the upper surface of the spring plate placing block 8 is provided with a limit clamping groove.
One side of the length-adjustable elastic sheet 9 is arranged on the limit clamping groove of the elastic sheet placing block 8; the length-adjustable spring plate 9 can be made of three different materials including beryllium bronze, 65 # manganese steel and 42 # manganese steel, so that different sensitivity requirements can be met.
The spring piece pressing block 10 is used for pressing the length-adjustable spring piece 9 into a limiting clamping groove of the spring piece placing block 8, so that a first fixed point is formed between the length-adjustable spring piece 9 and the spring piece pressing block 10;
the initial balancing weight 11 is arranged on the other side of the length-adjustable elastic sheet 9 and is connected with the length-adjustable elastic sheet 9 through a balancing nut 12;
A variable weight series 13 connected to the lower end of the weight nut 12 for variable breeding, the variable weight series being increased according to the sensitivity and the response frequency bandwidth;
The tuning slide block 15 is arranged between the length-adjustable elastic sheet 9 and two connecting parts of the elastic sheet placing block 8 and the initial balancing weight 11, and is provided with a horizontal sliding section for forming a second fixed point on the length-adjustable elastic sheet 9.
The sensing optical fiber 14 is provided with a first fixing node fixedly connected with the upper end of the elastic sheet pressing block 10 and a second fixing node fixedly connected with the upper end of the initial balancing weight 11. The sensing optical fiber 14 can vibrate synchronously with the initial weight 11 at a second consolidation point with the upper end of the initial weight 11.
The counterweight part consists of an initial counterweight, a counterweight nut and a variable counterweight series; the initial balancing weight is connected with the length-adjustable elastic sheet by a balancing weight nut, a certain length is reserved below the length-adjustable elastic sheet by the balancing weight nut for increasing or reducing the number of the balancing weights, and the tuning of sensitivity, response frequency and characteristic frequency can be realized by changing the weight of the vibrating end balancing weight in the sensor tuning process.
The sensing optical fiber is formed by welding a single mode optical fiber, a thermal expansion beam gradient refractive index multimode optical fiber and a single mode optical fiber, wherein the sensing optical fiber can be, but is not limited to, a thermal expansion beam gradient refractive index multimode optical fiber, a multi-cladding optical fiber, a coreless optical fiber, an hollow optical fiber, a step multimode optical fiber, a few-mode optical fiber, a conical optical fiber, a multi-core optical fiber, a photonic crystal optical fiber, a conical optical fiber and other various core diameter mismatch sensing optical fiber structures.
The tuning slider 15 comprises a center sill and a bottom sill, between which a sliding clamping nut 16 is connected. The length-adjustable spring plate 9 is located between the center sill and the sliding clamping nut 16 and is fixed on the lower surface of the center sill by the sliding clamping nut 16.
The spring piece placing block 8, the length-adjustable spring piece 9, the spring piece pressing block 10, the initial balancing weight 11, the balancing weight nut 12, the variable balancing weight series 13 and the tuning sliding block 15 are all installed inside the packaging shell 7. The packaging shell 7 is provided with a hole for the sensing optical fiber 14 to penetrate in and out, and the sensing optical fiber 14 is fixedly connected with the initial balancing weight 11 and the elastic sheet pressing block 10 in the packaging shell 7 through the hole for the sensing optical fiber 14 to penetrate in and out. The sensing optical fibers 14 manufactured by welding pass through round holes on the left side and the right side of the packaging shell 7 and are placed on the elastic sheet pressing block 10 and the initial balancing weight 11, and are bonded by high-strength structural adhesive.
The bottom of the packaging shell 7 is provided with a sliding groove, and a sliding clamping nut 16 sequentially penetrates through the sliding groove at the bottom of the sensor packaging shell 7 and the bottom beam of the tuning slide block 15, and the middle notch of the length-adjustable elastic sheet 9 is connected with the middle beam of the tuning slide block 15. When the sliding clamping nut 16 is rotated anticlockwise, the clamping effect of the tuning slide block 15 and the sliding clamping nut 16 on the adjustable elastic sheet 9 is weakened, and the sliding clamping nut 16 can be moved back and forth along the groove at the bottom of the packaging shell 7; when the sliding clamping nut 16 drives the tuning slide block 15 to move to the required response frequency, the sliding clamping nut 16 is rotated clockwise until the sliding clamping nut cannot rotate, and measurement can be performed.
The inside (left side) of the packaging shell 7 is connected with a spring piece placing block 8; the upper surface of the spring plate placing block 8 is provided with a limiting clamping groove, and the length-adjustable spring plate 9 is placed on the limiting clamping groove of the spring plate placing block 8, so that when the vibration reaches the characteristic frequency, the vibration direction of the adjustable spring plate 9 does not vibrate up and down fixedly, and at the moment, the limiting clamping groove can lock the adjustable spring plate 9 in the groove and does not slide; the spring plate pressing block 10 is used for pressing the length-adjustable spring plate 9, and the three are respectively provided with holes and connected through screws; the spring plate pressing block 10 is used for fixing the length-adjustable spring plate 9, so that the spring plate pressing block can have a good coupling effect with the sensing packer box 7; an initial balancing weight 11 is placed at the opening on the right side of the length-adjustable elastic sheet 9 and is connected by a balancing weight nut 12, and a reserved part of the balancing weight nut 12 can be provided with a variable balancing weight series 13 according to sensitivity and response to the requirement of frequency bandwidth; the middle beam of the tuning slide block 15 is propped against the upper surface of the length-adjustable elastic sheet 9, and the sliding clamping nut 16 sequentially passes through the sliding groove at the bottom of the sensor packaging shell 7 and the bottom beam of the tuning slide block 15, and the middle notch of the length-adjustable elastic sheet 9 is connected with the middle beam of the tuning slide block 15; when the sliding clamping nut 16 is rotated anticlockwise, the clamping effect of the tuning slide block 15 and the sliding clamping nut 16 on the adjustable elastic sheet 9 is weakened, and the sliding clamping nut 16 can be moved back and forth along the groove at the bottom of the packaging shell 7; when the sliding clamping nut 16 drives the tuning slide block 15 to move to the required response frequency, the sliding clamping nut 16 is rotated clockwise until the sliding clamping nut cannot rotate, and measurement can be performed. The sensing optical fibers 14 manufactured by welding pass through round holes on the left side and the right side of the packaging shell 7 and are placed on the elastic sheet pressing block 10 and the initial balancing weight 11, and are bonded by high-strength structural adhesive.
The vibration sensing principle is shown in the structure of fig. 3, the left side and the right side of the length-adjustable spring plate 9 are respectively provided with holes, the length-adjustable spring plate 9 is placed on a limit clamping groove of the spring plate placing block 8, and the length-adjustable spring plate 9 is tightly pressed by the spring plate pressing block 10, so that a fixed end can be formed; an initial balancing weight 11 is placed at the opening on the right side of the length-adjustable elastic sheet 9 and is connected by a balancing weight nut 12; the sensing optical fiber 14 manufactured by fusion welding is placed on the elastic sheet pressing block 10 and the initial balancing weight 11, and is bonded by high-strength structural adhesive.
When the vibration signal acts on the sensor, the counterweight end drives the sensing optical fiber 14 to deform; the optical signal inside the sensing optical fiber 14 can be changed along with the change of the vibration intensity and the frequency, the electric signal output by the changed optical signal after passing through the InGaAs PIN photoelectric detector 3 can also be changed in real time, and the external vibration information can be obtained by collecting and analyzing the electric signal through the multichannel data collecting module 4 and the signal analyzing and processing system 5.
The principle that the sensitivity and response frequency are tunable through different weight qualities is shown as a structure in fig. 4, an initial balancing weight 11 is placed at the opening on the right side of the length-adjustable elastic sheet 9 and is connected through a weight nut 12, a reserved part of the weight nut 12 can be used for designing different types of variable balancing weight series 13 according to the sensitivity through simulation calculation, and the number of the variable balancing weight series 13 is changed according to the response frequency bandwidth and the sensitivity.
The principle of sensitivity and response frequency tuning through the adjustable spring plate 9 is shown as a structure in fig. 5, and a tuning sliding block 15 and a sliding clamping nut 16 are added on the basis of the structure in fig. 3, so that a slot is formed in the middle of the length-adjustable spring plate 9. When the position of the sliding clamping nut 16 is changed, the sliding clamping nut 16 is screwed clockwise, the tuning slide block 15 and the sliding clamping nut 16 clamp and fix the length-adjustable elastic sheet 9, namely, the fixed end position is changed, so that the length of the vibrating part of the length-adjustable elastic sheet 9 is changed, and then the sensitivity, the response frequency and the characteristic frequency are changed.
The sensor performance was tested after the tuning structure design was implemented, and the test results are shown in fig. 6-9. The vibration sensor system was loaded on an experimental vibration table, calibration experiments were performed on the conditions of lengths of 0.6cm, 0.8cm, 1.0cm, 1.2cm,1.5cm (weight mass of 8.5 g), masses of 3.5g, 8.5g,9.5g (length of 1.0 cm) and acceleration of 0.2g, and after analysis and statistics of experimental data, images of a length-response spectrum and a mass-response spectrum were obtained, as shown in fig. 6 and 7; length-sensitivity and quality-sensitivity images are shown in fig. 8 and 9. The experimental results show that: when the lengths of the shrapnel are respectively 0.6cm, 0.8cm, 1.0cm, 1.2cm and 1.5cm (the weight mass is 8.5 g), the response frequencies are respectively 10-1000Hz, 10-1000Hz, 10-1850Hz, 10-1500Hz and 10-2000Hz, and the sensitivity is sequentially increased in the interval of 500-1000 Hz; when the weight is 3.5g, 8.0g and 9.5g (length is 1.0 cm), the response frequencies are respectively 10-2700Hz, 10-2000Hz and 10-1500Hz, and the sensitivity is increased in the interval of 400-1200 Hz; therefore, the sensor provided by the invention can be verified to change the length of the vibrating part of the elastic sheet through the tuning slide block 15 and the sliding clamping nut 16, and can effectively tune and change the response frequency, the characteristic frequency and the vibration sensing sensitivity of the sensor through changing the mass of the balancing weight of the vibrating end.
Multichannel-implementation: the system multi-channel distributed multi-point implementation is described below in conjunction with fig. 10. Each group of coaxial non-isolation FP cavity laser diode 1, optical fiber vibration sensor 2 and InGaAs PIN photoelectric detector 3 are connected in series to form a path of sensing channel, multiple paths of sensing channels can work in parallel, different sensing channels are respectively connected with different signal acquisition ends of the multiple-channel data acquisition card module 4 by utilizing the multiple-path signal synchronous acquisition capability of the multiple-channel data acquisition card module 4, and after photoelectric signals of different channels are synchronously acquired by the multiple-channel data acquisition card, the signals are analyzed in real time, so that distributed multipoint real-time monitoring can be realized.
Claims (10)
1. An optical fiber vibration sensor, comprising:
The elastic piece is provided with a first connecting part, a second connecting part and a third connecting part, and the second connecting part is positioned between the first connecting part and the third connecting part;
The first fixing device is used for fixing the elastic sheet at the first connecting part;
The second fixing device is used for fixing the elastic sheet at the second connecting part; the second fixing device is an adjustable fixing device and is used for adjusting the second fixing device to be positioned at different positions in the length direction of the elastic sheet;
the initial balancing weight is fixed at the third connecting part of the elastic sheet;
the sensing optical fiber is provided with a first fixed node fixedly connected with the first fixing device and a second fixed node fixedly connected with the initial balancing weight; the sensing optical fiber can vibrate up and down synchronously along with the initial balancing weight at the second fixed node.
2. The optical fiber vibration sensor according to claim 1, wherein the first fixing device comprises a spring plate placing block and a spring plate pressing block, and the first connecting portion of the spring plate is located between the spring plate placing block and the spring plate pressing block.
3. The optical fiber vibration sensor according to claim 2, wherein a limit clamping groove is formed on the upper surface of the elastic piece placing block; the elastic sheet is positioned in the clamping groove.
4. The fiber optic vibration sensor according to claim 1, wherein the second fixing means comprises a tuning slider and a sliding clamping nut.
5. The fiber optic vibration sensor according to claim 4, wherein the tuning slider comprises a center sill and a bottom sill, the slip clamping nut being disposed therebetween; the elastic sheet is positioned between the middle beam and the sliding clamping nut and is fixed on the lower surface of the middle beam by the sliding clamping nut.
6. The optical fiber vibration sensor according to claim 1, wherein a variable weight series is further provided at the third connection portion, the variable weight series is connected to a lower end of the weight nut, and weights of the variable weight series are increased according to the sensitivity and the response frequency bandwidth.
7. The fiber optic vibration sensor according to claim 1, wherein the spring, the first fixing device, the second fixing device and the initial weight are all mounted inside a package; and the packaging shell is provided with a hole for the sensing optical fiber to penetrate in and out, and the sensing optical fiber is fixedly connected with the initial balancing weight and the first fixing device in the packaging shell through the hole for the sensing optical fiber to penetrate in and out.
8. The fiber optic vibration sensor according to claim 7, wherein the sensing fiber is attached to the initial weight and the first attachment means by high strength structural adhesive.
9. An optical fiber vibration sensing system, characterized in that the optical fiber vibration sensor according to any one of claims 1 to 8 is employed.
10. An optical fiber vibration sensing method, characterized in that a vibration signal is obtained by using the optical fiber vibration sensor according to any one of claims 1 to 8.
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| CN113639845A (en) | 2021-11-12 |
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