CN101888578B - Interference-type optical fiber pick-up probe - Google Patents

Interference-type optical fiber pick-up probe Download PDF

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Publication number
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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China
Prior art keywords
optical fiber
reflectance coating
vibration
interference
probe
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CN 201010224963
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Chinese (zh)
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CN101888578A (en
Inventor
孙小菡
潘超
秦川
柏宁丰
樊鹤红
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Southeast University
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Southeast University
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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

Interference-type optical fiber pick-up probe
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).
CN 201010224963 2010-07-13 2010-07-13 Interference-type optical fiber pick-up probe Expired - Fee Related CN101888578B (en)

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CN 201010224963 CN101888578B (en) 2010-07-13 2010-07-13 Interference-type optical fiber pick-up probe

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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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CN101888578B true CN101888578B (en) 2013-04-03

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Families Citing this family (4)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005333180A (en) * 2004-05-18 2005-12-02 Audio Technica Corp Boundary microphone

Patent Citations (3)

* Cited by examiner, † Cited by third party
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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