CN212843957U - A Vibration Sensing Device Based on Optical Fiber Ring Ring Cavity - Google Patents
A Vibration Sensing Device Based on Optical Fiber Ring Ring Cavity Download PDFInfo
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- CN212843957U CN212843957U CN202021499447.5U CN202021499447U CN212843957U CN 212843957 U CN212843957 U CN 212843957U CN 202021499447 U CN202021499447 U CN 202021499447U CN 212843957 U CN212843957 U CN 212843957U
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 59
- 239000000835 fiber Substances 0.000 claims abstract description 47
- 239000013013 elastic material Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 7
- 230000035945 sensitivity Effects 0.000 abstract description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000002238 attenuated effect Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000011326 mechanical measurement Methods 0.000 description 1
- 239000013308 plastic optical fiber Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
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Abstract
本实用新型的一种基于光纤环形衰荡腔的振动传感装置，属于光纤传感技术领域，结构有信号源(1)、掺铒光纤放大器(2)、环形衰荡腔(3)、光电探测器(4)、示波器(5)；其中，所述环形衰荡腔(3)由第一光纤耦合器(301)、第二光纤耦合器(302)、延时光纤(303)、传感光纤(304)构成。本实用新型测量灵敏度高，可以实现对微小振动的测量，不受光源波动的影响，准确率较高。
The utility model relates to a vibration sensing device based on an optical fiber ring ring-down cavity, which belongs to the technical field of optical fiber sensing. A detector (4) and an oscilloscope (5); wherein, the ring-shaped ring-down cavity (3) is composed of a first fiber coupler (301), a second fiber coupler (302), a delay fiber (303), a sensor Optical fiber (304) is formed. The utility model has high measurement sensitivity, can realize the measurement of tiny vibration, is not affected by the fluctuation of the light source, and has high accuracy.
Description
Technical Field
The utility model belongs to the technical field of the optical fiber sensing, in particular to vibration measurement sensing device based on optic fibre annular ring-down chamber.
Background
Vibration measurement is essential in many fields, such as railways, smooth operation of railways, safety concerns for people's life, and in medical, construction, and seismic fields, where strict vibration measurements must be made. The vibration sensor is a common sensor, but the existing sensor has many problems, such as the utilization of a mechanical measurement method, the operation is convenient, but the precision is poor; the existing distributed vibration sensor obtains vibration information by changing the intensity of transmitted light, and the sensor is greatly influenced by the stability of the intensity of a light source in the measurement process. Therefore, the sensor with high sensitivity and high accuracy is designed to have important value.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to overcome the not enough of background art existence, provide a novel high, the high optic fibre annular of sensitivity of accuracy ring down the chamber and measure external vibration's sensing device.
The technical problem is solved by the following technical scheme:
a vibration sensing device based on an optical fiber annular ring-down cavity structurally comprises a signal source 1, an erbium-doped optical fiber amplifier (EDFA)2, an annular ring-down cavity 3, a photoelectric detector 4 and an oscilloscope 5; the annular ring-down cavity 3 is composed of a first optical fiber coupler 301, a second optical fiber coupler 302, a delay optical fiber 303 and a sensing optical fiber 304; the output end of the signal source 1 is connected with the input end of the erbium-doped fiber amplifier 2, the output end of the erbium-doped fiber amplifier 2 is connected with the first input end of the first fiber coupler 301, the output end of the first fiber coupler 301 is connected with the input end of the second fiber coupler 302, the first output end of the second fiber coupler is connected with the input end of the photoelectric detector 4, and the output end of the photoelectric detector 4 is connected with the oscilloscope 5; the second output end of the second optical fiber coupler 302 is connected with one end of a delay optical fiber 303, the other end of the delay optical fiber 303 is connected with one end of a sensing optical fiber 304, and the other end of the sensing optical fiber 304 is connected with the second input end of the first optical fiber coupler 301.
Preferably, the splitting ratio of the first output end to the second output end of the second fiber coupler 302 is 1: 99.
Further, the structure of the sensing fiber 304 is that the fiber is spirally adhered to the grid mesh, and a layer of elastic material is fixed on the fiber, as shown in fig. 2, the delay fiber 303 is a section of common fiber with a length greater than 1500 meters.
Has the advantages that:
1. the utility model provides an optic fibre annular ring down swings spectrum technique has the loss low, and the pulse comes and goes the number of times many, the long characteristics of optical path, the small change of loss in the optic fibre ring all can show the change that leads to ring down to swing the time, consequently can greatly improve vibration sensor's sensitivity.
2. The utility model discloses a change of optic fibre annular intracavity loss leads to the time variation that declines of light pulse in optic fibre ring, realizes the measurement to the vibration, therefore the measuring result is not influenced by light source power fluctuation, has higher accuracy.
3. The utility model discloses application scope is wide, and is corrosion-resistant, and response speed is fast.
Drawings
Fig. 1 is the utility model relates to a vibration sensing device's schematic structure based on optic fibre annular ring down chamber.
Fig. 2 is the utility model relates to a vibration sensing device middle sensing optical fiber's cloth is put the schematic diagram based on optic fibre annular ring down chamber.
Fig. 3 is the utility model relates to a vibration sensing device's tangent plane structure sketch map based on optic fibre annular ring down chamber.
Fig. 4 is the utility model relates to an optical fiber ring-shaped ring-down cavity-based vibration sensing device has the electricity signal attenuation curve that produces when having or not having the object vibration by the output of photoelectric detector.
Detailed Description
The present invention will be described in detail with reference to the following examples.
EXAMPLE 1 detailed structure of the present invention
The specific structure of the utility model is shown in figure 1, and the structure comprises a signal source 1, an erbium-doped fiber amplifier (EDFA)2, an annular ring-down cavity 3, a photoelectric detector 4 and an oscilloscope 5; the annular ring-down cavity 3 is composed of a first optical fiber coupler 301, a second optical fiber coupler 302, a delay optical fiber 303 and a sensing optical fiber 304; the output end of the signal source 1 is connected with the input end of the erbium-doped fiber amplifier 2, the output end of the erbium-doped fiber amplifier 2 is connected with the first input end of the first fiber coupler 301, the output end of the first fiber coupler 301 is connected with the input end of the second fiber coupler 302, the first output end of the second fiber coupler is connected with the input end of the photoelectric detector 4, and the output end of the photoelectric detector 4 is connected with the oscilloscope 5; the second output end of the second optical fiber coupler 302 is connected with one end of the delay optical fiber 303, and the splitting ratio of the first output end and the second output end of the second optical fiber coupler 302 is 1: 99; the other end of the delay fiber 303 is connected to one end of the sensing fiber 304, and the other end of the sensing fiber 304 is connected to the second input end of the first fiber coupler 301.
The structure of the sensing optical fiber 304 is shown in fig. 2, a section of optical fiber is sequentially adhered to the grid according to the sequence of a1, a2, A3, a4, B1, B2, B3, B4 and … … N4, and a layer of elastic material is fixed on the grid, wherein the sequence of the three is shown in fig. 3. The optical fiber can be made of quartz optical fiber or plastic optical fiber.
Embodiment 2 the working principle of the present invention
Pulsed light emitted by the signal source 1 enters the ring cavity through the first input end of the first optical fiber coupler 301, after the pulsed light is split by the second optical fiber coupler 302, only 1% of the pulsed light signals are output from the first output end of the second optical fiber coupler 302 and detected by the photoelectric detector 4, and the rest 99% of the pulsed light signals are output from the second output end of the second optical fiber coupler 302 and enter the ring cavity. The pulsed light is attenuated in the annular cavity for a plurality of cycles, and in each cycle, the photoelectric detector 4 outputs an exponentially attenuated electric signal due to the loss of the sensing optical fiber 304 and other optical fiber devices.
The transmission of the optical pulse signal in the optical fiber annular cavity follows the exponential attenuation law:
where I is the intensity at time t, I0The initial incident light intensity is L, the total length of the optical fiber in the annular ring-down cavity 3 is c, the transmission speed of light in vacuum is c, n is the average refractive index of the optical fiber, and A is the loss value of light during transmission of the optical fiber ring. Defining the time for light attenuation to 1/e of the initial intensity as the ring-down time τ of the cavity0。
τ0＝nL/cA (2)
If an object vibrates on the sensing fiber 304, the transmission loss of light in the fiber is increased, and the light attenuation time of the cavity is also changed:
τ＝nL/c(A+B) (3)
and B is the additional sensing loss caused by the vibration of the external object.
Therefore, it is understood from equation 3 that when an object vibrates on the sensing fiber, the ring-down time is shortened, and the more severe the vibration, the larger the loss, and the shorter the ring-down time. The attenuation curve of the electrical signal output by the photodetector 4 when there is object vibration on the sensing fiber 304 is shown in fig. 4. Therefore, the vibration intensity of the external physical quantity can be obtained by measuring the ring-down time.
Claims (3)
1. A vibration sensing device based on an optical fiber annular ring-down cavity structurally comprises a signal source (1), an erbium-doped optical fiber amplifier (2), an annular ring-down cavity (3), a photoelectric detector (4) and an oscilloscope (5); the annular ring-down cavity (3) is composed of a first optical fiber coupler (301), a second optical fiber coupler (302), a delay optical fiber (303) and a sensing optical fiber (304); the output end of a signal source (1) is connected with the input end of an erbium-doped fiber amplifier (2), the output end of the erbium-doped fiber amplifier (2) is connected with the first input end of a first fiber coupler (301), the output end of the first fiber coupler (301) is connected with the input end of a second fiber coupler (302), the first output end of the second fiber coupler is connected with the input end of a photoelectric detector (4), and the output end of the photoelectric detector (4) is connected with an oscilloscope (5); the second output end of the second optical fiber coupler (302) is connected with one end of the delay optical fiber (303), the other end of the delay optical fiber (303) is connected with one end of the sensing optical fiber (304), and the other end of the sensing optical fiber (304) is connected with the second input end of the first optical fiber coupler (301).
2. The fiber ring-down cavity-based vibration sensing device as claimed in claim 1, wherein the splitting ratio of the first output end to the second output end of the second fiber coupler (302) is 1: 99.
3. The vibration sensing device based on the optical fiber ring-down cavity as claimed in claim 1 or 2, wherein the sensing optical fiber (304) is constructed by adhering the optical fiber to the grid mesh in a spiral shape and fixing a layer of elastic material on the optical fiber; the delay optical fiber (303) is a section of common optical fiber with the length of more than 1500 meters.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021499447.5U CN212843957U (en) | 2020-07-27 | 2020-07-27 | A Vibration Sensing Device Based on Optical Fiber Ring Ring Cavity |
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| CN202021499447.5U CN212843957U (en) | 2020-07-27 | 2020-07-27 | A Vibration Sensing Device Based on Optical Fiber Ring Ring Cavity |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114152327A (en) * | 2021-12-13 | 2022-03-08 | 中国科学院光电技术研究所 | A vibration detection method based on cavity ring-down technology |
| CN114719953A (en) * | 2022-03-31 | 2022-07-08 | 中国科学院光电技术研究所 | A straight cavity vibration detection device |
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2020
- 2020-07-27 CN CN202021499447.5U patent/CN212843957U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114152327A (en) * | 2021-12-13 | 2022-03-08 | 中国科学院光电技术研究所 | A vibration detection method based on cavity ring-down technology |
| CN114152327B (en) * | 2021-12-13 | 2023-12-22 | 中国科学院光电技术研究所 | Vibration detection method based on cavity ring-down technology |
| CN114719953A (en) * | 2022-03-31 | 2022-07-08 | 中国科学院光电技术研究所 | A straight cavity vibration detection device |
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