CN101888578B - Interference-type optical fiber pick-up probe - Google Patents
Interference-type optical fiber pick-up probe Download PDFInfo
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- CN101888578B CN101888578B CN 201010224963 CN201010224963A CN101888578B CN 101888578 B CN101888578 B CN 101888578B CN 201010224963 CN201010224963 CN 201010224963 CN 201010224963 A CN201010224963 A CN 201010224963A CN 101888578 B CN101888578 B CN 101888578B
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- optical fiber
- reflectance coating
- vibration
- interference
- probe
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 46
- 239000000523 sample Substances 0.000 title claims abstract description 15
- 239000002184 metal Substances 0.000 claims abstract description 23
- 239000011248 coating agent Substances 0.000 claims description 29
- 238000000576 coating method Methods 0.000 claims description 29
- 238000009738 saturating Methods 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 239000000919 ceramic Substances 0.000 abstract 3
- 238000005253 cladding Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 208000002925 dental caries Diseases 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000000985 reflectance spectrum Methods 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The invention discloses an interference-type optical fiber pick-up probe relating to a distributed interference-type optical fiber pick-up probe based on space division multiplexing. The pick-up probe comprises an optical fiber (11), an annular ceramic clamp (12), a vibration reflecting film (13), a metal sound transmission mesh screen (14) and a metal housing (15), wherein an inner wall of the annular ceramic clamp (12) is fixedly connected with a cladding of the optical fiber (11), an outer wall of the annular ceramic clamp (12) is fixed inside the metal housing (15), and an outer wall of the vibration reflecting film (13) and an outer wall of the metal sound transmission mesh screen (14) are also fixed inside the metal housing (15); and an end surface where the optical fiber (11) is in contact with the vibration reflecting film (13) is concave and matched with the contact area of the vibration reflecting film (13) to enlarge the contact area of the light and the vibration reflecting film (13).
Description
Technical field
The present invention relates to a kind of distributed interference-type optical fiber pick-up probe based on space division multiplexing, belong to Fibre Optical Sensor and sensor-based network technology field.
Background technology
Traditional electric class microphone, be subject to electromagnetic interference, and sensing element has the existence of electric current, voltage, these seriously limit their range of application, can produce the giant mechanical and electrical equipment place (power plant) of strong-electromagnetic field when for example working, deposit warehouse inflammable, explosion hazard gases, and between the test of the nulcear magnetic resonance (NMR) in the hospital etc.Optical fiber microphone is because having anti-electromagnetic interference, and volume is little, and is lightweight, is easy to consist of sensing network and realizes multimetering, is just becoming present study hotspot.Optical fiber microphone can be divided three classes according to operation principle: intensity modulation type, grating type optical fiber and interfere type.The intensity type microphone is based on the principle that the transmission light intensity is modulated by sound wave in the optical fiber, and these type optical fiber microphone research and development are morning, and main modulation format has optical fiber micro-bending formula, optical fiber twisting type, frustrated total internal reflection formula and raster pattern etc.This optical fiber microphone is simple in structure, and demodulation method is relatively easy, but it is low to there is precision, is subjected to the more serious shortcoming of the large grade of external interference.Grating type optical fiber microphone principle: utilize the sound wave strain to cause the drift of Fiber Bragg Grating FBG (FBG) reflectance spectrum, with the wavelength signals demodulation, extract acoustic signals.This optical fiber microphone LF-response is poor, is generally used for supersonic sounding, and less stable.
Usually the optical fiber microphone array that adopts wavelength-division multiplex technique to consist of need use a plurality of light sources and a plurality of optical receiving circuit, and cost is higher, complex structure.Therefore, how to reduce cost, simplified structure is realized the optical fiber microphone array that monochromatic light is received and dispatched, and becomes key issue.
Summary of the invention
Technical problem: the objective of the invention is for the deficiencies in the prior art, propose a kind of interference-type optical fiber pick-up probe, this probe is with low cost, and light source driving circuit is simple, and stability is high, and is highly sensitive, practical.
Technical scheme: interference-type optical fiber pick-up probe of the present invention comprises optical fiber, ring-shaped pottery anchor clamps, vibration reflectance coating, the saturating sound guard of metal and metal shell; Wherein, the inwall of ring-shaped pottery anchor clamps and the covering of optical fiber are fixedly connected, and the outer wall of ring-shaped pottery anchor clamps is fixed on inside of metal outershell, and vibration reflectance coating outer wall, the saturating sound guard of metal outer wall also are fixed on inside of metal outershell; Optical fiber matches with vibrating the contact area of the contacted end face concavity of reflectance coating with the vibration reflectance coating, enlarges light and the contact area of vibrating reflectance coating.The arc surface radius R that the vibration reflectance coating contacts with optical fiber
1Diameter greater than optical fiber.
Beneficial effect:
1) adopt red-light LED as the light source of optical fiber microphone, with low cost, light source driving circuit is simple, and stability is high.
2) adopt the Michelson's interferometer principle to make pickup head, and optimized the parameter of a probe part, highly sensitive, practical.
3) adopt the mode of difference to remove the light source shake to the impact of optical fiber microphone, reduced system noise, improved Systems balanth.
4) utilize optical switch, the sample-based principle, realize the space division multiplexing of many sensing probes, consist of the distribution type fiber-optic microphone array, compare with wavelength division multiplexing, do not need to adopt the laser of expensive tunable laser or a plurality of different wave lengths, and only need No. one photodetector to get final product, with low cost, system configuration is simple.
Description of drawings
Fig. 1 is the interfere type pickup head structural representation that the present invention proposes.
Embodiment
The interfere type pickup head that the present invention proposes is that spill and the optical fiber 11 that is coated with reflectance coating, ring-shaped pottery anchor clamps 12, vibration reflectance coating 13, the saturating sound guard 14 of metal and metal shell 15 form by end face; Wherein, the covering of the inwall of ring-shaped pottery anchor clamps 12 and optical fiber 11 is fixedly connected, and the outer wall of ring-shaped pottery anchor clamps 12 is fixed on metal shell 15 inboards, and vibration reflectance coating 13 outer walls, saturating sound guard 14 outer walls of metal also are fixed on metal shell 15 inboards; Optical fiber 11 matches with vibrating the contact area of reflectance coating 13 contacted end face concavities with vibration reflectance coating 13, enlarges light and the contact area of vibrating reflectance coating 13.The arc surface radius R that vibration reflectance coating 13 contacts with optical fiber 11
1Diameter greater than optical fiber 11; The diameter R of vibration reflectance coating 13
2Equal the internal diameter of metal shell 15, the thickness of vibration reflectance coating 13 is d.
1), optical fiber 11 end faces is worn into spill, expansion light and the contact area of vibrating reflectance coating 13; 2), plate the reflectance coating of certain reflectivity at optical fiber 11 end faces, make the visibility of interferometer reach maximum; 3), use the saturating sound guard 14 of metal at probe, with vibration reflectance coating 13 formation cavitys, the sensitivity that improves the vibration reflectance coating.
The specific works process is as follows: in pickup head, part light wave is by optical fiber 11 end face reflections, a part is passed the air gap between optical fiber 11 end faces and the vibration reflectance coating 13, reflect via vibration reflectance coating 13, two parts light goes out to interfere in optical fiber 11 ends, when extraneous sound wave evokes 13 vibration of vibration reflectance coating by the saturating sound guard 14 of metal, the phase of light wave that reflects via the vibration reflectance coating changes, intensity after two parts interference of light changes, and has realized the phase-modulation of acoustic signals to lightwave signal.
Claims (2)
1. an interference-type optical fiber pick-up probe is characterized in that this pickup head comprises optical fiber (11), ring-shaped pottery anchor clamps (12), vibration reflectance coating (13), the saturating sound guard of metal (14) and metal shell (15); Wherein, the covering of the inwall of ring-shaped pottery anchor clamps (12) and optical fiber (11) is fixedly connected, the outer wall of ring-shaped pottery anchor clamps (12) is fixed on metal shell (15) inboard, and vibration reflectance coating (13) outer wall, the saturating sound guard of metal (14) outer wall also are fixed on metal shell (15) inboard; Optical fiber (11) matches with vibrating the contact area of the contacted end face concavity of reflectance coating (13) with vibration reflectance coating (13), enlarges light and the contact area of vibrating reflectance coating (13).
2. interference-type optical fiber pick-up probe according to claim 1 is characterized in that vibrating the arc surface radius R that reflectance coating (13) contacts with optical fiber (11)
1Diameter greater than optical fiber (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010224963 CN101888578B (en) | 2010-07-13 | 2010-07-13 | Interference-type optical fiber pick-up probe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010224963 CN101888578B (en) | 2010-07-13 | 2010-07-13 | Interference-type optical fiber pick-up probe |
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| Publication Number | Publication Date |
|---|---|
| CN101888578A CN101888578A (en) | 2010-11-17 |
| CN101888578B true CN101888578B (en) | 2013-04-03 |
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| CN 201010224963 Expired - Fee Related CN101888578B (en) | 2010-07-13 | 2010-07-13 | Interference-type optical fiber pick-up probe |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104697624B (en) * | 2015-03-18 | 2017-07-07 | 华中科技大学 | A kind of acoustic detector based on Michelson's interferometer |
| CN107484071B (en) | 2017-09-13 | 2019-12-03 | 京东方科技集团股份有限公司 | A kind of optical fiber sound pick-up and preparation method thereof and preparation facilities |
| CN108132093B (en) * | 2017-10-11 | 2020-08-11 | 黄辉 | Suspended membrane optical fiber acoustic wave sensor and preparation method thereof |
| CN108900250B (en) * | 2018-08-28 | 2020-10-20 | 太原理工大学 | Mining passive pickup device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1520511A (en) * | 2001-06-27 | 2004-08-11 | ��ʽ�����ȶ˿�ѧ������������ | Device and method for vibration measurement |
| CN2834067Y (en) * | 2005-06-28 | 2006-11-01 | 深圳市豪恩电声科技有限公司 | Optical fibre microphone |
| CN201805547U (en) * | 2010-07-13 | 2011-04-20 | 东南大学 | Interferometric optical fiber adapterization probe |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005333180A (en) * | 2004-05-18 | 2005-12-02 | Audio Technica Corp | Boundary microphone |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1520511A (en) * | 2001-06-27 | 2004-08-11 | ��ʽ�����ȶ˿�ѧ������������ | Device and method for vibration measurement |
| CN2834067Y (en) * | 2005-06-28 | 2006-11-01 | 深圳市豪恩电声科技有限公司 | Optical fibre microphone |
| CN201805547U (en) * | 2010-07-13 | 2011-04-20 | 东南大学 | Interferometric optical fiber adapterization probe |
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| CN101888578A (en) | 2010-11-17 |
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