CN211123239U - Device for measuring object position based on optical fiber vibration sensing - Google Patents

Device for measuring object position based on optical fiber vibration sensing Download PDF

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Publication number
CN211123239U
CN211123239U CN201921499781.8U CN201921499781U CN211123239U CN 211123239 U CN211123239 U CN 211123239U CN 201921499781 U CN201921499781 U CN 201921499781U CN 211123239 U CN211123239 U CN 211123239U
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circuit
optical
coupler
optical fiber
division multiplexing
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成奇
韦朴
黄鹏飞
吴悠
唐沁
魏峘
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Nanjing Institute of Technology
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Nanjing Institute of Technology
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Abstract

The utility model discloses a device based on optical fiber vibration sensing measurement object position, including light path, interference circuit, waveform analysis circuit, the light path sends light source more than two to interfering the circuit, interferes the circuit and includes a plurality of couplers, all-fiber mirror, first wavelength division multiplexing module and second wavelength division multiplexing module, and the coupler is used for making the light signal more than two produce and interferes, and all-fiber mirror is used for reflecting the light signal of reacing the mirror surface to the coupler, and first light division multiplexing module is connected and is used for synthesizing a light signal input coupler with the multichannel light signal of light path input, and second light division multiplexing module is used for dividing into multichannel light signal according to the wavelength with the light signal of coupler output. The device of the utility model has the characteristics of simple, practice thrift the cost, detect high sensitivity, passive, stability good etc, the later maintenance management of being convenient for.

Description

Device for measuring object position based on optical fiber vibration sensing
Technical Field
The utility model relates to an object position monitoring technology field, concretely relates to device based on optical fiber vibration sensing measurement object position.
Background
The distributed optical fiber vibration sensing technology plays a great role in various fields such as geological detection, bridge and dam state monitoring, petroleum pipeline safety, security and protection, voice monitoring and the like. The traditional sensing system is mainly based on an electronic sensing technology, adopts an electronic sensor to obtain vibration data, and returns the detection data in a wired or wireless mode. However, the energy supply problem of the electronic sensor is very outstanding, which severely limits the application range of vibration monitoring, in the field of position monitoring, the traditional electronic monitoring technology has the problems of interference of environmental electromagnetic waves, poor concealment, poor precision and the like, and in the field of time measurement, the traditional timer also has the defects of poor timing precision, short timing time, large mass, complicated components and parts and incapability of remote adjustment, so the social requirements of the optical fiber sensing technology, the wave analysis module and the high-precision timer are increasing day by day.
Distributed optical fiber vibration sensing technology, wave analysis module and high precision timing technology are widely regarded for the advantages of passive measurement, high sensitivity, high reliability, long-distance signal transmission, high precision, strong stability, wide timing range, few external elements, high sensitivity, light weight and programmable control. The optical fiber has the characteristics of no radiation of electromagnetic waves, low energy consumption and good stability, can accurately and reliably restore micro disturbance and detection in the environment, has great application value in monitoring of perimeter security, can realize positioning by utilizing the propagation speed of the optical waves with different wave speeds in the optical fiber through the wave analysis module, and improves the accuracy of object position measurement.
SUMMERY OF THE UTILITY MODEL
The purpose of the invention is as follows: to the above problem, the utility model provides a device based on optic fibre vibration sensing measurement object position to traditional electronic sensor to object position monitoring unstable, easily by external electromagnetic wave interference, disguise poor and traditional time-recorder precision poor, the timing time is short, the quality is big and the loaded down with trivial details and the problem that can not the remote regulation of components and parts, can solve the accurate measuring problem to the time, improved vibration transmission's stability and the reliability to object position monitoring.
The technical scheme is as follows: in order to achieve the technical purpose, the utility model adopts the following technical scheme:
a device for measuring object position based on optical fiber vibration sensing is used for detecting the position where object disturbance occurs, and is characterized in that: including light path, interference circuit, waveform analysis circuit, the light path sends light source to interference circuit more than two, interference circuit includes a plurality of couplers, full optical fiber speculum, first wavelength division multiplexing module and second wavelength division multiplexing module, the coupler is used for making more than two optical signals produce the interference, full optical fiber speculum is used for reflecting the light signal that arrives the mirror surface to the coupler, first optical wavelength division multiplexing module is connected and is used for synthesizing an optical signal input coupler with the multichannel optical signal of light path input, second optical wavelength division multiplexing module is used for dividing the optical signal of coupler output into multichannel optical signal according to the wavelength, waveform analysis circuit is including the disturbance detection circuit that is used for detecting the phase difference of same moment signal.
Preferably, the optical path includes two light sources S L ED with different wavelengths of emitted light, and the two light sources S L ED are both connected to the first optical wavelength division multiplexing module;
the interference circuit mainly comprises a 2 x 2 coupler, a 1 x 2 coupler and an all-fiber reflector, a delay line circuit and an optical fiber direct connection circuit are arranged between the 2 x 2 coupler and the 1 x 2 coupler, the 2 x 2 coupler and the 1 x 2 coupler form a bidirectional optical interference circuit, one bidirectional port of the 1 x 2 coupler is connected to the surface of the all-fiber reflector through a detection optical fiber, object disturbance occurs on the line of the detection optical fiber, and the all-fiber reflector is used for reflecting optical signals;
the output end of the first optical wavelength division multiplexing module and the input end of the second optical wavelength division multiplexing module are respectively connected with two bidirectional ports coupled by 2 x 2, and the output end of the second optical wavelength division multiplexing module is connected with a waveform analysis circuit, the waveform analysis circuit and the position where the disturbance occurs.
Preferably, the waveform analysis circuit includes a first photoelectric detection circuit, a second photoelectric detection circuit, a first disturbance detection circuit, a second disturbance detection circuit, an analysis circuit, and a high-precision timer, where the first disturbance detection circuit and the second disturbance detection circuit are both connected to the analysis circuit, and the analysis circuit is connected to the high-precision timer.
Preferably, the first photoelectric detection circuit and the second photoelectric detection circuit are the same and each include a first-stage 10-time amplification circuit, a second-stage adjustable amplification factor circuit and a follower circuit.
Preferably, the analysis circuit comprises a waveform extraction module, a noise reduction module and a waveform analysis module.
Preferably, the high-precision Timer comprises a Timer module for detecting the transmission time difference of the light waves with different wave speeds, and the position of the object is obtained by calculating the propagation speeds of the two light signals and the time difference of the two light signals reaching the high-waveform analysis circuit.
Preferably, the optical path includes two light sources S L ED with different emission wavelengths, and the emission wavelengths of the two light sources S L ED are 850nm and 1550nm, respectively.
Preferably, the all-fiber reflector adopts a reflector mainly composed of one-dimensional photonic crystals, so that the all-fiber reflector has high withstand power and wide applicable wavelength range and can improve the transmission loss of the optical fiber during large-curvature bending.
Has the advantages that: due to the adoption of the technical scheme, the utility model discloses following technological effect has:
(1) the optical fiber vibration sensing transmission is stable, the sensitivity is high, the optical fiber does not reflect electromagnetic waves, the energy consumption is low, the optical fiber has the characteristics of high sensitivity, no source and good stability, the device is simple, the cost is saved, and the later maintenance and management are facilitated;
(2) the device utilizes the optical interference principle, adopts the optical fiber vibration sensing and waveform matching analysis technology to monitor the position of an object, and can effectively solve the energy supply problem of the traditional electronic sensor;
(4) thereby can effectively improve the quality of ripples through the analysis module of passing through the wave form with the signal of transmission and improve the precision of judging the object position, and high accuracy meter time ware quality is light, and stability is strong, and is programmable, the effectual function of solving electronic sensor has enlarged the range of application of vibration monitoring.
Drawings
FIG. 1 is a general schematic diagram of the structure of the present invention;
FIG. 2 is a diagram of the optical path structure of the present invention;
FIG. 3 is a circuit diagram of the present invention;
FIG. 4 is a block diagram of a waveform analysis module according to the present invention;
FIG. 5 is a schematic diagram of the disturbance circuit of the present invention;
FIG. 6 is a schematic diagram of the wave analysis principle of the present invention;
wherein, 1 is a first light source S L ED, 2 is a second light source S L ED, 3 is a first optical wavelength division multiplexing module, 4 is a second optical wavelength division multiplexing module, 5 is a 2 × 2 coupler, 6 is a 1 × 2 coupler, 7 is an all-fiber mirror, 8 is a first photoelectric detection circuit, 9 is a second photoelectric detection circuit, 10 is a first disturbance detection circuit, 11 is a second disturbance detection circuit, 12 is an analysis circuit, and 13 is a high-precision timer.
Detailed Description
The present invention will be further described with reference to fig. 1.
As shown in figure 1, the utility model discloses a device based on optical fiber vibration sensing measurement object position, including light path, interference circuit and waveform analysis circuit three, including experimental light source S L ED1 (like wavelength 850 nm), experimental light source S L ED2 (like wavelength 1550 nm), first light wavelength division multiplexing module WDM3, 1 x 2 'S coupler 6, 2 x 2' S coupler 5, full fiber mirror 7, second light wavelength division multiplexing module WDM4, first photoelectric detection module PD8, second photoelectric detection module PD9, first disturbance detection circuit 10, second disturbance detection circuit 11, analytical circuit 12 and high accuracy meter time-recorder 13.
Specifically, as shown in fig. 1 to 3, the optical path includes two light sources S L ED1, 2 having different wavelengths of emitted light, the interference circuit includes a first optical wavelength division multiplexing module 3 and a second optical wavelength division multiplexing module 4, both the two light sources S L ED1, 2 are connected to the first optical wavelength division multiplexing module 3, the interference circuit mainly includes a 2 × 2 coupler 5, a 1 × 2 coupler 6 and an all-fiber mirror 7, a delay line and an optical fiber direct connection line are disposed between the 2 × 2 coupler 5 and the 1 × 2 coupler 6, the 2 × 2 coupler 5 and the 1 × 2 coupler 6 form a bidirectional optical interference circuit, one bidirectional port of the 1 × 2 coupler 6 is connected to the surface of the all-fiber mirror 7 through a detection optical fiber, an object disturbance occurs on the line of the detection optical fiber, the optical fiber mirror 7 is used for signal detection, the output end of the first optical wavelength division multiplexing module 3, the input end of the second optical wavelength division multiplexing module 4 are connected to the input end of the 2 optical wavelength division multiplexing module 4, and the two-way optical wave form a waveform analysis circuit, and the second optical wave form a second optical interference circuit.
As shown in fig. 4 to 6, the waveform analyzing circuit includes a first photo-detection circuit 8, a second photo-detection circuit 9, a first disturbance detection circuit 10, a second disturbance detection circuit 11, an analyzing circuit 12 and a high-precision timer 13, wherein the first disturbance detection circuit 10 and the second disturbance detection circuit 11 are both connected to the analyzing circuit 12, the analyzing circuit 12 is connected to the high-precision timer 13, for example, L F356 chip, OP27 chip, L M386 chip and 555 timer are adopted, the first photo-detection circuit 12 and the second photo-detection circuit 10 are the same and both include a first stage 10-fold amplification circuit, a second stage amplification factor adjustable circuit and a follower circuit, and the analyzing circuit includes a waveform extracting module, a noise reducing module and a waveform analyzing module for performing waveform extraction, noise reduction, waveform analysis, waveform matching and the like on signals.
The utility model discloses in, high accuracy meter time ware is including the time ware module that is used for detecting out the transmission time difference of different wave speed light waves, and the position of object is calculated by the propagation velocity of two light signals and the time difference that reachs high wave form analysis circuit and is obtained.
The utility model discloses a theory of operation does, send the unequal light wave of wavelength to arrive the light signal reflection back of full fiber reflector through interfering the circuit by experimental light source S L ED, the opposite direction is in proper order through interfering the light path, when the vibration information of external object acts on sensing optical fiber, the phase place of light wave will change, and interfere the light path and then can trun into the small phase place change of light wave into intensity information, and finally received by the photoelectric detection module through light wavelength division multiplexing module, the photoelectric detection template changes the light signal into the signal of telecommunication, and power amplification spreads into disturbance detection circuit into, the analysis module of rethread wave form carries out the wave form and matches, the position that the object just can be judged to the transmission time difference Timer of different wave speed light waves is measured with the high accuracy time meter at last.
The above description is only a preferred embodiment of the present invention, and it should be noted that: for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present invention.

Claims (8)

1. A device for measuring object position based on optical fiber vibration sensing is used for detecting the position where object disturbance occurs, and is characterized in that: including light path, interference circuit, waveform analysis circuit, the light path sends light source to interference circuit more than two, interference circuit includes a plurality of couplers, full optical fiber speculum, first wavelength division multiplexing module and second wavelength division multiplexing module, the coupler is used for making more than two optical signals produce the interference, full optical fiber speculum is used for reflecting the light signal that arrives the mirror surface to the coupler, first optical wavelength division multiplexing module is connected and is used for synthesizing an optical signal input coupler with the multichannel optical signal of light path input, second optical wavelength division multiplexing module is used for dividing the optical signal of coupler output into multichannel optical signal according to the wavelength, waveform analysis circuit is including the disturbance detection circuit that is used for detecting the phase difference of same moment signal.
2. The device for measuring the position of an object based on optical fiber vibration sensing according to claim 1, wherein the optical path comprises two light sources S L ED with different emitted light wavelengths, and the two light sources S L ED are both connected with the first optical wavelength division multiplexing module;
the interference circuit mainly comprises a 2 x 2 coupler, a 1 x 2 coupler and an all-fiber reflector, a delay line circuit and an optical fiber direct connection circuit are arranged between the 2 x 2 coupler and the 1 x 2 coupler, the 2 x 2 coupler and the 1 x 2 coupler form a bidirectional optical interference circuit, one bidirectional port of the 1 x 2 coupler is connected to the surface of the all-fiber reflector through a detection optical fiber, object disturbance occurs on the line of the detection optical fiber, and the all-fiber reflector is used for reflecting optical signals;
the output end of the first optical wavelength division multiplexing module and the input end of the second optical wavelength division multiplexing module are respectively connected with two bidirectional ports coupled by 2 x 2, and the output end of the second optical wavelength division multiplexing module is connected with a waveform analysis circuit, the waveform analysis circuit and the position where the disturbance occurs.
3. The device for measuring the position of an object based on optical fiber vibration sensing according to claim 1, wherein: the waveform analysis circuit comprises a first photoelectric detection circuit, a second photoelectric detection circuit, a first disturbance detection circuit, a second disturbance detection circuit, an analysis circuit and a high-precision timer, wherein the first disturbance detection circuit and the second disturbance detection circuit are connected to the analysis circuit, and the analysis circuit is connected with the high-precision timer.
4. The device for measuring the position of an object based on optical fiber vibration sensing according to claim 3, wherein: the first photoelectric detection circuit and the second photoelectric detection circuit are the same and respectively comprise a first-stage 10-time amplification circuit, a second-stage amplification factor adjustable circuit and a following circuit.
5. The device for measuring the position of an object based on optical fiber vibration sensing according to claim 3, wherein: the analysis circuit comprises a waveform extraction module, a noise reduction module and a waveform analysis module.
6. The device for measuring the position of an object based on optical fiber vibration sensing according to claim 3, wherein: the high-precision Timer comprises a Timer module used for detecting the transmission time difference of light waves with different wave speeds, and the position of an object is obtained by calculating the propagation speed of two optical signals and the time difference of the two optical signals reaching the high-waveform analysis circuit.
7. The device for measuring the position of an object based on optical fiber vibration sensing according to claim 1, wherein the optical path comprises two light sources S L ED with different emission wavelengths, and the emission wavelengths of the two light sources S L ED are 850nm and 1550nm, respectively.
8. The device for measuring the position of an object based on optical fiber vibration sensing according to claim 1, wherein: the all-fiber reflector adopts a reflector mainly composed of one-dimensional photonic crystals.
CN201921499781.8U 2019-09-10 2019-09-10 Device for measuring object position based on optical fiber vibration sensing Active CN211123239U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201921499781.8U CN211123239U (en) 2019-09-10 2019-09-10 Device for measuring object position based on optical fiber vibration sensing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201921499781.8U CN211123239U (en) 2019-09-10 2019-09-10 Device for measuring object position based on optical fiber vibration sensing

Publications (1)

Publication Number Publication Date
CN211123239U true CN211123239U (en) 2020-07-28

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