CN108401554B - Full optical fiber interference type micro-vibration signal orientation pickup probe - Google Patents
Full optical fiber interference type micro-vibration signal orientation pickup probe Download PDFInfo
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- CN108401554B CN108401554B CN200810075196.5A CN200810075196A CN108401554B CN 108401554 B CN108401554 B CN 108401554B CN 200810075196 A CN200810075196 A CN 200810075196A CN 108401554 B CN108401554 B CN 108401554B
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Abstract
The present invention relates to a kind of full optical fiber interference type micro-vibration signals to orient pickup probe.The channeled optical fiber of laser that the laser light source of pickup probe is sent out is transmitted to the first fiber coupler, which is divided into two beams, all the way as light is referred to, is used as signal light all the way；Reference light, signal light are transmitted to the second fiber coupler through reference arm optical fiber and signal arm optical fiber respectively, two-beam interferes at the second fiber coupler, interference light is back to receiving terminal through Transmission Fibers, by signal arm fiber optic disc around at flat disc shape, it is bonded with colloid, and elastic sound-absorbing material is set between signal arm optical fiber and guiding optical cable, the first fiber coupler, reference arm optical fiber, the second fiber coupler, Transmission Fibers.One layer of elastic sound-absorbing material is arranged in the present invention between signal arm optical fiber disk and reference arm optical fiber, is not only effectively increased susceptibility of the probe to target micro-vibration signal, but also the micro-vibration signal that the spuious direction of effective attenuation is transmitted, forms fiber orientation probe.
Description
Technical field
The invention belongs to optical fiber micro-vibration signal pickup technology, especially a kind of full optical fiber interference type micro-vibration signal orientation is picked up
Take probe.
Background technology
Micro-vibration signal pickup technology in solid is especially detectd in skill in mechanical processing, bridge monitoring, security protection and military affairs
There is important application in equal fields.With the development of science and technology with the progress of technological level, the sensitivity that micro-vibration signal is detected,
The indexs such as directionality, electromagnetic environment adaptability propose increasingly higher demands.
Traditional piezoelectric type or magneto-electric vibration-detecting instrument generally can only vibration of the detected amplitude at 1 micron or more, although its
It is technology maturation, cheap, it is apparent that being difficult to meet the increasing testing requirements to micro-vibration signal.From last century
Since the eighties, interference formula laser technology is applied to vibration measurement by laser technology rapid development, and measurement accuracy is
Up under 0.1 micron.Inventor king to towards etc. provide a kind of " full-fiber nanometer-precision displacement and vibration interference measuring instrument "
(Chinese Patent Application No.：02112077.3), the non-contact of nano-grade displacement and vibration is realized using fizeau interferometer
Formula measures, but its optical interference circuit is space optical path, and system performance is easily by environment such as interferometer self stability and atmospheric turbulances
Factor influences, and the characteristics of its non-cpntact measurement is restricted in some applications.Inventor's Huang cloud just etc. provide one kind
" Fiber optic micro-vibration sensor based on fiber grating " (Chinese Patent Application No.：200410066814.1), utilize suspension
The resonance of bragg grating and measured object is amplified the Oscillation Amplitude of measured object, is detected by Techniques of wavelength detection
Micro-vibration detection is realized in the drift of fiber bragg grating centre wavelength caused by extraneous micro-vibration.But it is examined using resonance
The dynamic principle of vibration measuring determines that it is relatively low to the micro-vibration signal response sensitivity far from resonant frequency.
Invention content
The purpose of the present invention is to provide a kind of high sensitivity, have the function of directional detection, electromagnetic environment adaptability it is good,
It can adapt to the full optical fiber interference type micro-vibration signal orientation pickup probe of modern micro-vibration signal testing requirements.
Realize that the technical solution of the object of the invention is：A kind of full optical fiber interference type micro-vibration signal orientation pickup probe,
The channeled optical fiber of laser that laser light source is sent out is transmitted to the first fiber coupler, which is divided into two
Beam is used as signal light all the way all the way as light is referred to；Reference light, signal light are respectively through reference arm optical fiber and signal arm light
Fibre is transmitted to the second fiber coupler, and two-beam interferes at the second fiber coupler, and interference light is returned through Transmission Fibers
Receiving terminal is reached, by signal arm fiber optic disc around at flat disc shape, is bonded with colloid, guiding optical cable, the first optical fiber coupling
Clutch, reference arm optical fiber, the second fiber coupler, Transmission Fibers are placed on one layer, constitute device layer, elastic sound absorber
Material is arranged between the device layer and signal arm optical fiber.
Compared with prior art, the present invention its remarkable advantage is：(1) between signal arm optical fiber disk and reference arm optical fiber
The elastic sound-absorbing material of one layer of setting is not only effectively increased susceptibility of the probe to target micro-vibration signal, but also effective attenuation
The micro-vibration signal that spuious direction is transmitted forms fiber orientation probe, and it is micro- that orientation probe can effectively exclude spuious direction
Vibration signal interferes, and realizes the detection to specific direction micro-vibration signal.(2) signal arm fiber lengths are longer, are coiled into
Flat disc shape, and bonded with colloid, probe is integrally placed in solid, and fiber reel just to measured signal, can make spy
Head is maximum to the receiving area of micro-vibration signal, effectively improves sensor sensitivity, while probe being made to have relatively flat frequency
Response.(3) light path is designed using all -fiber, and probe is whole to use passive, without metallization schemes, and anti-external electromagnetic is dry
It disturbs, while electromagnetic wave will not be emitted around, using nonequilibrium Mach-Zehnder interferometer, light source frequency is coordinated to modulate,
The technologies such as exocoel phase-modulation make that interferometer phase decline is overcome to become simple.
Present invention is further described in detail below in conjunction with the accompanying drawings.
Description of the drawings
Fig. 1 is the side view of full optical fiber interference type micro-vibration signal orientation pickup probe of the present invention.
Fig. 2 is the vertical view of full optical fiber interference type micro-vibration signal orientation pickup probe of the present invention.
Specific implementation mode
In conjunction with Fig. 1, full optical fiber interference type micro-vibration signal orientation pickup probe of the present invention can be placed in solid and use,
Sense the micro-vibration signal in solid.The channeled optical fiber of laser that laser light source is sent out 1 is transmitted to the first fiber coupler 2,
First fiber coupler 2 is divided into two beams, all the way as light is referred to, is used as signal light all the way；Reference light, signal
Light is transmitted to the second fiber coupler 5 through reference arm optical fiber 3 and signal arm optical fiber 4 respectively, and two-beam is in the second optical fiber coupling
It is interfered at clutch 5, interference light is back to receiving terminal through Transmission Fibers 6, through follow-up Photoelectric Detection and signal processing electricity
Road can recover original micro-vibration signal.Signal arm optical fiber 4 is coiled into flat disc shape, is bonded with colloid, and
Signal arm optical fiber 4 and guiding optical cable 1, the first fiber coupler 2, reference arm optical fiber 3, the second fiber coupler 5,
Elastic sound-absorbing material 7 is set between Transmission Fibers 6, forms micro-vibration signal orientation pickup probe.The elasticity sound-absorbing material
7 can be the sound bought on the market must gram, thickness can be 3~10mm.
In conjunction with Fig. 2, signal arm optical fiber 3 is coiled into flat by full optical fiber interference type micro-vibration signal orientation pickup probe of the present invention
Face disk inner ring radius is generally 2~2.25cm, and outer shroud radius is then determined by signal arm fiber lengths, generally 4~7cm,
Signal arm optical fiber is longer, forms non-equilibrium fiber Mach-Zehnder interferometer.Elastic sound-absorbing material is cut into radius
4.5~7.5cm or so, the cake of high 3~10mm.Fiber reel, elastic sound-absorbing material, reference arm optical fiber 4 are laminated into
Three-decker as shown in Figure 1.Finally by above-mentioned three-decker and it is packed into ABS engineering plastics protective case 8, probe, which makes, is
It is completed.
It should select suitably to believe according to the size of the size of laser frequency noise, outer frequency modulation(PFM) or phase-modulation amplitude
Number arm optical fiber and reference arm optical fiber length difference.1 meter is usually taken to arrive several rice, theoretically reference arm optical fiber is longer, probe
Sensitivity is higher.To reduce reference arm tender subject, the shorter reference arm optical fiber generally the better.
Claims (2)
1. a kind of full optical fiber interference type micro-vibration signal orientation pickup probe, it is characterised in that：What laser light source was sent out swashs
The channeled optical fiber of light (1) is transmitted to the first fiber coupler (2), which is divided into two beams,
All the way as light is referred to, it is used as signal light all the way；Reference light, signal light are respectively through reference arm optical fiber (3) and signal arm
Optical fiber (4) is transmitted to the second fiber coupler (5), and two-beam interferes at the second fiber coupler (5), does
It relates to light and is back to receiving terminal through Transmission Fibers (6), signal arm optical fiber (4) is coiled into flat disc shape, with colloid
Bonding, guiding optical cable (1), the first fiber coupler (2), reference arm optical fiber (3), the second fiber coupler (5),
Transmission Fibers (6) are placed on one layer, constitute device layer, and elastic sound-absorbing material (7) is arranged in the device layer and signal arm
Between optical fiber (4).
2. full optical fiber interference type micro-vibration signal orientation pickup probe according to claim 1, it is characterised in that：
The thickness of elastic sound-absorbing material (7) is 3~10mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810075196.5A CN108401554B (en) | 2008-04-11 | 2008-04-11 | Full optical fiber interference type micro-vibration signal orientation pickup probe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810075196.5A CN108401554B (en) | 2008-04-11 | 2008-04-11 | Full optical fiber interference type micro-vibration signal orientation pickup probe |
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| CN108401554B true CN108401554B (en) | 2012-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200810075196.5A Active CN108401554B (en) | 2008-04-11 | 2008-04-11 | Full optical fiber interference type micro-vibration signal orientation pickup probe |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107328429A (en) * | 2017-08-09 | 2017-11-07 | 武汉隽龙科技股份有限公司 | The device and method for closely sensing stability can be improved in optical frequency domain reflection technology |
| CN107730799A (en) * | 2017-10-13 | 2018-02-23 | 重庆励祺科技有限公司 | Hidden optical cable perturbation sensing system |
-
2008
- 2008-04-11 CN CN200810075196.5A patent/CN108401554B/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107328429A (en) * | 2017-08-09 | 2017-11-07 | 武汉隽龙科技股份有限公司 | The device and method for closely sensing stability can be improved in optical frequency domain reflection technology |
| CN107328429B (en) * | 2017-08-09 | 2023-05-09 | 武汉昊衡科技有限公司 | Device and method for improving proximity sensing stability in optical frequency domain reflection technology |
| CN107730799A (en) * | 2017-10-13 | 2018-02-23 | 重庆励祺科技有限公司 | Hidden optical cable perturbation sensing system |
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Legal Events
| Date | Code | Title | Description |
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| GR03 | Grant of secret patent right | ||
| DC01 | Secret patent status has been lifted | ||
| DC01 | Secret patent status has been lifted | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180831 Address after: 230088 Anhui Hefei high tech Zone Innovation Industrial Park two phase G4 building A block 4-5 floor. Patentee after: Anhui to Bo photoelectricity Polytron Technologies Inc Address before: 230039 three fat Road, Hefei, Anhui Patentee before: Anhui University |