CN207051308U - A kind of big visual field photon Doppler speed measuring device - Google Patents
A kind of big visual field photon Doppler speed measuring device Download PDFInfo
- Publication number
- CN207051308U CN207051308U CN201720454734.6U CN201720454734U CN207051308U CN 207051308 U CN207051308 U CN 207051308U CN 201720454734 U CN201720454734 U CN 201720454734U CN 207051308 U CN207051308 U CN 207051308U
- Authority
- CN
- China
- Prior art keywords
- laser
- signal
- test signal
- light path
- mode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000000007 visual effect Effects 0.000 title claims abstract description 14
- 238000012360 testing method Methods 0.000 claims abstract description 35
- 230000003287 optical effect Effects 0.000 claims abstract description 12
- 239000000835 fiber Substances 0.000 claims description 55
- 239000013307 optical fiber Substances 0.000 claims description 24
- 230000008878 coupling Effects 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 6
- 238000005859 coupling reaction Methods 0.000 claims description 6
- 238000000926 separation method Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 8
- 230000008859 change Effects 0.000 description 4
- 238000005474 detonation Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000005622 photoelectricity Effects 0.000 description 2
- 238000000827 velocimetry Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- FMYKJLXRRQTBOR-BZSNNMDCSA-N acetylleucyl-leucyl-norleucinal Chemical compound CCCC[C@@H](C=O)NC(=O)[C@H](CC(C)C)NC(=O)[C@H](CC(C)C)NC(C)=O FMYKJLXRRQTBOR-BZSNNMDCSA-N 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
Landscapes
- Optical Radar Systems And Details Thereof (AREA)
Abstract
Laser testing field is the utility model is related to, the utility model is in view of the shortcomings of the prior art, there is provided a kind of big visual field photon Doppler speed measuring device for the frequency f for realizing moving object interference signal.Laser signal is separated into the intrinsic light field signal of laser and test signal by the utility model laser signal separation light path；After test signal is irradiated in surface of moving object by test signal transmitting light path, test signal receiving light path is reflexed to；Test signal receiving light path receives the test signal with movable information of moving object reflection, so as to form the reception light field signal of whole visual field；The intrinsic light field signal of laser after processing and the reception light field signal after processing are carried out interference treatment by laser signal optical interference circuit, obtain the frequency f of moving object interference signal.
Description
Technical field
It the utility model is related to and be related to laser testing field, especially a kind of big visual field photon Doppler speed measuring device.
Background technology
Photon Laser Doppler Technique For Measuring Velocity is to be based on optical Doppler effect and beam interference principle, and its operation principle is as follows：
Laser is radiated at the surface of moving object to be measured, and the laser of reflection can produce and moving object because of Doppler (Doppler) effect
The directly proportional frequency displacement of speed, the reflected light of frequency displacement is set to be interfered with the intrinsic light of laser, the change of interference frequencies reflects fortune
The change of dynamic speed, by obtain history that interference frequencies change over time so as to non-contactly, continuously measure moving object
The change procedure of the speed in body surface face, displacement and acceleration.
Photon Doppler anemometer (Photon Doppler Velocimeter, PDV) and any reflecting surface speed interference
Instrument (Velocity Interferometer System for Any Reflector, VISAR) is Shock wave physics and detonation
Important tester in physical study field.In the detonation velocity measuring technique development of early stage, due to being turned by photoelectricity at that time
Parallel operation and the limitation of oscillograph recording bandwidth, VISAR is always the leading role that detonation tests the speed.
The development of Fibre Optical Communication Technology and high speed optoelectronic device makes photon Laser Doppler Technique For Measuring Velocity (Photon Doppler
Velocimetry, PDV) develop rapidly, U.S.'s livermore national laboratory (Lawrence Livermore in 2006
National Laboratory, LLNL) permed table one in REVIEW OF SCIENTIFIC INSTRUMENTS publications the 77th
Piece article (Compact system for high-speed velocimetry using heterodyne techniques)
Describe photon Laser Doppler Technique For Measuring Velocity and its application in detonation physics.
Utility model content
The shortcomings that primarily directed to current PDV velocity measuring techniques, for example, spot speed can only be measured, device is easily damaged, price
Expensive, return loss is difficult to eliminate, it is proposed that a kind of brand-new technological improvement, there is provided frequency for realizing moving object interference signal
Rate f big visual field photon Doppler speed measuring device.
In order to solve the above technical problems, how general using a kind of technical scheme be to provide a kind of big visual field photon for the utility model
Strangling speed measuring device includes：
A kind of big visual field photon Doppler speed measuring device includes：
Laser connects multi-module optical fiber coupler, and laser signal is separated into the intrinsic light field of laser by multi-module optical fiber coupler
Signal and test signal；
Test signal transmitting light path transmitting test signal；
Test signal receiving light path receives reflection or the scattering light of the target surface of moving object, and connects respectively with fiber amplifier
Connect；
Test signal receiving light path output end is connected by fiber amplifier, fiber coupler and laser signal optical interference circuit
Connect；
Multimode fibre attenuator receives the intrinsic light field signal of laser, and is arrived by multimode fibre attenuator, 1*N multimodes
Single-mode optical-fibre coupler is connected with laser signal optical interference circuit.
Further, the test signal transmitting light path is realized by multimode fibre；Or by multimode fibre and with
The lens of multimode fibre coupling are realized；The laser for wherein producing laser signal uses multimode fibre as tail optical fiber.
Further, the test signal receiving light path is realized by single-mode fiber, or by single-mode fiber and with
The lens of Single-Mode Fiber Coupling are realized.
Further, when fiber amplifier number is N, when N is equal to 1, laser signal optical interference circuit includes a single mode
Fiber coupler and a photodetector, 1*N multimodes to single mode converter refer to 1*1 multimodes to single mode converter；Work as N
During more than or equal to 2, laser signal optical interference circuit includes N number of single-mode optical-fibre coupler and N number of photodetector, 1*N multimodes to list
Weighted-voltage D/A converter refers to 1*N multimodes to single mode converter.
In summary, by adopting the above-described technical solution, the beneficial effects of the utility model are：
In current PDV velocity measuring techniques, it is coaxial configuration to launch light path and receiving light path, then using beam splitter or belt
Device realizes the separation for receiving light beam.Inevitably there is return loss in other system, light and target surface return caused by return loss
The detection light returned interferes with each other, and is understood so as to influence signal.
The lens or multimode fibre that test signal transmitting light path is in the utility model and multimode fibre couples in itself, are surveyed
Trial signal launches light path by test signal and is irradiated to moving object target surface, forms a big visual field；Test signal receives light
Road uses and the lens of single-mode fiber beam coupling realize the detection for detecting light field, so as to form connecing for the reflective light intensity of whole visual field
Receive, light field and the intrinsic optical interference of laser are received, so as to realize the frequency f of moving object interference signal measurement.Due to this reality
With coaxial configuration is not used, eliminating the influence of return loss, be more beneficial for the deciphering of signal in new.
The PDV velocity-measuring systems of prior art use full single-mode fiber structure, are carried using coupling of the single-mode fiber to laser
Go out very high requirement, considerably increase the cost of laser.Other single-mode fiber is very easy to damage under high power laser light
It is bad, reduce the stability of system.And the laser in the utility model uses multimode fibre to reduce laser as tail optical fiber
The development cost of device, test signal transmitting light path equally use multimode fibre, can so ensure high power laser light in multimode light
Transmitted in fibre, because 10 times bigger than single-mode fiber of the core diameter of multimode fibre is to more than 100 times, therefore can effectively reduce laser work(
Rate density, prevent optical fibre device (such as fiber connector, circulator etc.) from damaging.
Brief description of the drawings
Fig. 1 is test signal transmitting light path and test signal receiving light path and moving object target surface schematic diagram.
Fig. 2 is the utility model principle block diagram.
In figure：
1- narrow linewidth laser 2- multi-module optical fiber coupler 3- test signals launch light path
4- test signal receiving light path 5- multimode fibre attenuator 6-- fiber amplifiers
7- fiber amplifier 8-1 × N multimodes are to single mode converter 9- optical fiber filters
10- optical fiber filter 11- single-mode optical-fibre coupler 12- single-mode optical-fibre couplers
13- photodetector 14- photodetectors.
Embodiment
Below in conjunction with the accompanying drawings, the utility model is described in detail.
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is only explaining
The utility model, it is not used to limit the utility model.
Entirely single mode-multimode fibre mixed structure is used in the utility model.Laser is using multimode fibre as tail optical fiber；
Test signal transmitting light path uses multimode fibre；Test signal receiving light path uses single-mode fiber；Finally by single-mode fiber coupling
Clutch realizes the interference of dual-beam.
Connected mode is as follows：Laser connects multi-module optical fiber coupler, and multi-module optical fiber coupler is divided into two branch roads；One
Branch road launches the target surface of light path irradiation moving object by test signal, and single-mode fiber beam receives in test signal receiving light path
The reflection of the target surface of autokinesis object or scattering light, and be connected on fiber amplifier, fiber amplifier connection optical fiber filter
Ripple device；Another branch road laser intrinsic signals connects fibre optic attenuator, and fibre optic attenuator connects 1 × N multimodes and turned to single mode
Parallel operation.Two branch road light are connected to the output end of single-mode optical-fibre coupler, the output end connection photoelectricity of single-mode optical-fibre coupler
Detector.
The wavelength of laser is usually 1550nm, can so utilize existing optic communication device；Line width is 10kHz left
The right side, so as to fully ensure that the temporal coherence of laser.The core diameter of multimode fibre be 62.5 μm or more than.The core diameter of single-mode fiber
For 10 μm.Single-mode optical-fibre coupler can be 1 × 2 or 3 × 3 structures.The bandwidth of detector is generally in more than 5GHz so as to protecting
Demonstrate,prove high tachometric survey.
Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit the utility model
All any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in the utility model
Protection domain within.
Claims (4)
- A kind of 1. big visual field photon Doppler speed measuring device, it is characterised in that including：Laser connects multi-module optical fiber coupler, and laser signal is separated into the intrinsic light field signal of laser by multi-module optical fiber coupler And test signal；Test signal transmitting light path transmitting test signal；Test signal receiving light path receives reflection or the scattering light of the target surface of moving object, and is connected respectively with fiber amplifier；Test signal receiving light path output end is connected by fiber amplifier, fiber coupler and laser signal optical interference circuit；Multimode fibre attenuator receives the intrinsic light field signal of laser, and passes through multimode fibre attenuator, 1*N multimodes to single-mode optics Fine coupler is connected with laser signal optical interference circuit.
- A kind of 2. big visual field photon Doppler speed measuring device according to claim 1, it is characterised in that the test signal Transmitting light path is realized by multimode fibre；Or realized by multimode fibre and the lens coupled with multimode fibre；Wherein produce The laser of raw laser signal is using multimode fibre as tail optical fiber.
- A kind of 3. big visual field photon Doppler speed measuring device according to claim 1 or 2, it is characterised in that the test letter Number receiving light path is realized by single-mode fiber, or is realized by single-mode fiber and with the lens of Single-Mode Fiber Coupling.
- 4. a kind of big visual field photon Doppler speed measuring device according to claim 1, it is characterised in that work as fiber amplifier Number is N, and when N is equal to 1, laser signal optical interference circuit includes a single-mode optical-fibre coupler and a photodetector, 1*N Multimode refers to 1*1 multimodes to single mode converter to single mode converter；When N is more than or equal to 2, laser signal optical interference circuit includes N number of single-mode optical-fibre coupler and N number of photodetector, 1*N multimodes to single mode converter refer to that 1*N multimodes are changed to single mode Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720454734.6U CN207051308U (en) | 2017-04-27 | 2017-04-27 | A kind of big visual field photon Doppler speed measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720454734.6U CN207051308U (en) | 2017-04-27 | 2017-04-27 | A kind of big visual field photon Doppler speed measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207051308U true CN207051308U (en) | 2018-02-27 |
Family
ID=61488836
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720454734.6U Active CN207051308U (en) | 2017-04-27 | 2017-04-27 | A kind of big visual field photon Doppler speed measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207051308U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113050114A (en) * | 2021-03-16 | 2021-06-29 | 深圳市杰普特光电股份有限公司 | Laser speed measuring method and speed measuring device |
| CN117074719A (en) * | 2023-05-17 | 2023-11-17 | 山东省科学院海洋仪器仪表研究所 | Photon counting coherent ocean flow field velocity measurement system and method with self-adaptive local oscillation light |
-
2017
- 2017-04-27 CN CN201720454734.6U patent/CN207051308U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113050114A (en) * | 2021-03-16 | 2021-06-29 | 深圳市杰普特光电股份有限公司 | Laser speed measuring method and speed measuring device |
| CN113050114B (en) * | 2021-03-16 | 2023-12-29 | 深圳市杰普特光电股份有限公司 | Laser speed measuring method and device |
| CN117074719A (en) * | 2023-05-17 | 2023-11-17 | 山东省科学院海洋仪器仪表研究所 | Photon counting coherent ocean flow field velocity measurement system and method with self-adaptive local oscillation light |
| CN117074719B (en) * | 2023-05-17 | 2024-01-09 | 山东省科学院海洋仪器仪表研究所 | Local oscillator light-adaptive photon counting coherent ocean flow field velocity measurement system and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101793600B (en) | Measuring device and method of optical fibre transmission loss factor | |
| CN108663138B (en) | Distributed optical fiber temperature and vibration sensing system and method | |
| CN104279959B (en) | A kind of new method of the fine length of use vector network analyzer precise measuring | |
| CN101764646B (en) | Wavelength-encoding optical time domain reflection test device and measurement method thereof | |
| CN101634571B (en) | Optical pulse raster distributed fiber sensing device | |
| CN104764898B (en) | It is a kind of to realize two kinds of velocity measuring techniques to a measuring point while the device of repetition measurement using single probe monochromatic light road | |
| CN102636121A (en) | High-precision optical fiber length measuring system | |
| CN109959403B (en) | Multi-parameter large-capacity sensing system | |
| CN110501062B (en) | Distributed optical fiber sound sensing and positioning system | |
| CN107860461B (en) | Phase Optical Time Domain Reflectometry and Optical Fiber Double Pulse Differential Perturbation Detector | |
| CN109412699A (en) | Pulse generation method, device, coherent phase sensitivity time domain reflection method and system | |
| CN104180831A (en) | Sensitivity-enhanced optical time domain reflection distributed Michelson interferometer based on two-core optical fiber | |
| CN107064539A (en) | A kind of big visual field photon Doppler speed measuring device and method | |
| CN202676133U (en) | High-precision optical fiber length measuring system | |
| CN107167228A (en) | Distribution type fiber-optic vibration measuring system and method based on outdoor small span OPPC optical cables | |
| CN108957209A (en) | A kind of broken string automatic detection device of telecommunication optical fiber optical cable production | |
| CN207051308U (en) | A kind of big visual field photon Doppler speed measuring device | |
| CN205120239U (en) | Vibration detection device based on optical frequency domain reflectometer | |
| CN101799304B (en) | Reflection type differential strength modulating optical fiber sensing device and method thereof | |
| CN109374914A (en) | All-fiber Doppler Velocimetry Device with Large Dynamic Measurement Range | |
| CN104180832A (en) | Distributed orthogonal vector disturbance sensing system based on four-core optical fiber | |
| CN102419442B (en) | Double source laser interference velocity measurement system | |
| CN102226683A (en) | Light wave microwave secondary frequency mixing system | |
| CN102253390A (en) | Optical-fiber displacement interferometer | |
| CN103528666A (en) | Long-distance optical fiber vibration detection device and method on basis of Sagnac interference |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |