CN103152684B - Optical-fiber microphone probe - Google Patents
Optical-fiber microphone probe Download PDFInfo
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- CN103152684B CN103152684B CN201310077501.5A CN201310077501A CN103152684B CN 103152684 B CN103152684 B CN 103152684B CN 201310077501 A CN201310077501 A CN 201310077501A CN 103152684 B CN103152684 B CN 103152684B
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Abstract
The invention discloses a kind of optical-fiber microphone probe, it is characterized in that comprising: for responding to the vibrating diaphragm of acoustical vibration, shell and inner core; Described vibrating diaphragm is arranged on the front end of shell, and is provided with the front shroud protected vibrating diaphragm in the front end of vibrating diaphragm; Described inner core is arranged in the container cavity of shell, and the inner core fiber end face of interior core fibre front end on inner core and vibrating diaphragm are formed with reflection cavity.This optical-fiber microphone probe performance is unanimously high, can form intensity formula and the fiber microphone based on FP principle of interference, has the advantages that anti-electromagnetic interference capability is strong, highly sensitive, be easy to the row forming array.In addition, this microphone sonde configuration is simple, is convenient to install, debugging and producing, and is with low costly suitable for extensive popularization.
Description
Technical field
The present invention relates to technical field of optical fiber sensing, particularly relate to one and can form intensity formula or FP interfere type fiber microphone, for the optical-fiber microphone probe in the fields such as speech communication, sound-detection and noise testing.
Background technology
Microphone is a kind of for receiving voice signal, and is finally converted to the device of the signal of telecommunication.Current extensive use have condenser microphone, the electric capacity pickup voice signal that this microphone is made up of conductive diaphragm and metal back electrode, its principle is: acoustical vibration causes conductive diaphragm to vibrate, electric capacity two anode-cathode distance is caused to change, holding capacitor two electrode potential is constant, then sound causes capacitance stores electricity to change, thus acoustical signal is converted to the signal of telecommunication.Because this capacitance is very little, its impedance is very large, and therefore this microphone must join a pre-amplification circuit, as impedance transformation, to ensure that microphone can be connected with other circuit.Although condenser microphone has fabulous frequency response characteristic and higher sensitivity, from its operation principle, this microphone is easily subject to electromagnetic signal interference, is therefore not suitable for working under the electromagnetic environment of complexity.
For the problem of voice signal pickup under solution complex electromagnetic environment, propose the fiber microphone based on optical fiber sensing technology.The general principle of fiber microphone is voice signal first modulated light signal, and the light signal being loaded with voice signal, through opto-electronic conversion, finally becomes the signal of telecommunication, completes the pickup of voice signal.Because acoustical signal dim signal process is not by electromagnetic interference, therefore fiber microphone has extremely strong anti-electromagnetic interference capability, normally can work in the electromagnetic environment of complexity.
In the application such as sound-detection, noise testing, the microphone group battle array that General Requirements uses uses, and exigent to microphone consistency of performance, as sensitivity is close, phase place is unanimously high.Current technology more ripe fiber microphone product mainly intensity formula, as described a kind of optical fiber microphone in utility model patent CN2834067Y, describes a kind of sensing head of optical fiber acoustic sensor in patent of invention CN101504311B.Although these optical-fiber microphone probe technical feasibilities, owing to lacking adjustment structure, its consistency of performance ensures very much, is unfavorable for that the group battle array of fiber microphone uses.Although describe in utility model patent CN2834067Y in optical fiber microphone structure and employ pad, this pad and back cover are integrally formed, because which limit its function as adjustment structure, optical fiber microphone consistency of performance be can not be guaranteed.
Summary of the invention
The present invention is directed to the proposition of above problem, and develop a kind of optical-fiber microphone probe.The technological means that the present invention adopts is as follows:
A kind of optical-fiber microphone probe, is characterized in that comprising: for responding to the vibrating diaphragm of acoustical vibration, shell and inner core; Described vibrating diaphragm is arranged on the front end of shell, and is provided with the front shroud protected vibrating diaphragm in the front end of vibrating diaphragm; Described inner core is arranged in the container cavity of shell, and the inner core fiber end face of interior core fibre front end on inner core and vibrating diaphragm are formed with reflection cavity.
Described microphone probe also comprises the interior degree of depth for regulating inner core to probe into of the container cavity being arranged on shell, with the pad of the distance of the inner core fiber end face and vibrating diaphragm that regulate interior core fibre front end; And the thickness of described pad is 1-1000 micron.Described inner core end is provided with spring shim and lock ring successively, is fixedly connected, is fixed in the container cavity of shell by inner core by lock ring and shell.The reflective surface of described vibrating diaphragm is provided with gold nano reflector layer, and the thickness of gold nano reflector layer is 10-500 nanometer.Described vibrating diaphragm is the micro-vibrating diaphragm of titanium foil, stainless steel foil, nickel foil or silicon; The thickness of vibrating diaphragm is 1-10 micron.Described interior core fibre is monomode fiber or multimode fiber.Described reflection cavity is FP interference cavity, and inner core is monomode fiber.
The present invention compared with the existing technology, its advantage is apparent: this optical-fiber microphone probe performance is unanimously high, intensity formula and the fiber microphone based on FP principle of interference can be formed, have the advantages that anti-electromagnetic interference capability is strong, highly sensitive, be easy to be formed array, the fields such as speech communication, sound-detection and noise testing can be widely used in.In addition, this microphone sonde configuration is simple, is convenient to install, debugging and producing, and is with low costly suitable for extensive popularization.
Accompanying drawing explanation
Fig. 1 is optical-fiber microphone probe structural representation of the present invention;
Fig. 2 is optical-fiber microphone probe combining structure schematic diagram of the present invention;
Fig. 3 is fiber microphone operation principle schematic diagram of the present invention.
Embodiment
Optical-fiber microphone probe comprises as depicted in figs. 1 and 2: for responding to the vibrating diaphragm 102 of acoustical vibration, shell 103 and inner core 105; Described vibrating diaphragm 102 is arranged on the front end of shell 103, and is provided with the front shroud 101 protected vibrating diaphragm in the front end of vibrating diaphragm 102; Described inner core 105 is arranged in the container cavity of shell 103, and the inner core fiber end face 109 of interior core fibre 108 front end on inner core 105 is formed with reflection cavity with vibrating diaphragm.Wherein vibrating diaphragm 102 is arranged on the front end of shell 103, vibrate for sensitive sound, inner core 105 is arranged on shell 103 inside and regulates the distance of the inner core fiber end face 109 of interior core fibre 108 front end and vibrating diaphragm 102 (usually put into the container cavity of shell 103 at inner core 105 before by pad 104, pad 104 is put into the container cavity of shell 103, be stuck on container cavity inwall or be stuck in the projection in container cavity, insert inner core 105 again, by regulating the thickness putting into pad 104, reach the distance regulating inner core fiber end face 109 and vibrating diaphragm 102), realize the modulation of acoustical signal to light signal, in addition, at inner core 105 end successively mounting spring pad 106 and lock ring 107, lock ring 107 with fix inner core 105 by shell 103, ensure the structural stability of probe 1.This structure is applicable to intensity formula fiber microphone and the fiber microphone based on FP principle of interference.
Vibrating diaphragm is formed by laser welding technology by titanium foil, stainless steel foil or nickel foil, or the micro-vibrating diaphragm of silicon made by MEMS technology.The thickness of vibrating diaphragm is 1-10 micron.The reflective surface of vibrating diaphragm is manufactured with gold nano reflector layer by magnetron sputtering technique, to improve the reflection to infrared light, thus improves the sensitivity of fiber microphone.The thickness of gold nano reflector layer is 10-500 nanometer.
For ensureing the consistency of optical-fiber microphone probe performance, adopt simplified structure design and flexible design.In designs simplification, devise the inner core 105 of integrative-structure, in flexible, devise and adopt replaceable pad 104 to control the distance of inner core fiber end face 109 and vibrating diaphragm 102.Be that the pad 104 by different-thickness regulates sensitivity and the phase place of fiber microphone in assembling optical fiber microphone probe process, thus ensure the consistency of fibre-optical probe performance.The thickness of pad 104 is 1-1000 micron.
The optical-fiber microphone probe of the present invention's design can form intensity formula fiber microphone, probe in the optical fiber microphone recorded in utility model patent CN2834067Y as replaced, be intensity formula fiber microphone, based under this mode of operation, microphone adopts the LED light source of wide range, and interior core fibre 108 can be monomode fiber or multimode fiber.Operation principle under intensity formula fiber microphone pattern: the light that LED light source is launched enters interior core fibre 108, and from inner core fiber end face 109 outgoing to vibrating diaphragm 102, interior core fibre 108 is reflected back by vibrating diaphragm 102, diaphragm oscillations causes intensity of reflected light to change, through opto-electronic conversion, obtain acoustical signal.
The optical-fiber microphone probe of the present invention's design also can form the fiber microphone based on FP principle of interference, and in this case, inner core 105 front end fiber end face 109 and vibrating diaphragm 102 form FP interference cavity.In this operating mode, microphone adopts LD laser as light source, interior core fibre 108 is monomode fibers, the course of work is as follows: the laser that LD laser is launched enters in interior core fibre 108, light is at inner core fiber end face 109 antireflection part light, from the light of inner core fiber end face 109 transmission after vibrating diaphragm 102 reflects, a part of reverberation reenters in interior core fibre 108.FP occurs for the light that inner core fiber end face 109 reflects and the vibrating diaphragm 102 reflection light reentered in interior core fibre 108 interferes, and interference light light signal is converted to the signal of telecommunication, namely realizes the pickup of voice signal.
As shown in Figure 3 when the probe that optical-fiber microphone probe of the present invention is based on FP principle of interference, its operation principle is: the monochromatic light that LD laser is launched enters the FP chamber of inner core fiber end face 109 and vibrating diaphragm 102 formation from interior core fibre 108, and form interference light signal, if the intensity of vibrating diaphragm interference light when equilbrium position is Q point place in figure 3, when sound causes diaphragm oscillations, FP chamber length is caused to change, the FP change of cavity length that sound wave causes is very little, interference light intensity is changed back and forth near Q point, through opto-electronic conversion, the light intensity signal of change is become the signal of telecommunication, this signal of telecommunication is voice signal.
The above; be only the present invention's preferably embodiment; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, all should be encompassed within protection scope of the present invention.
Claims (6)
1. an optical-fiber microphone probe, is characterized in that comprising: for responding to the vibrating diaphragm of acoustical vibration, shell and inner core;
Described vibrating diaphragm is arranged on the front end of shell, and is provided with the front shroud protected vibrating diaphragm in the front end of vibrating diaphragm;
Described inner core is arranged in the container cavity of shell, and the inner core fiber end face of interior core fibre front end on inner core and vibrating diaphragm are formed with reflection cavity; Described microphone probe also comprises the interior degree of depth for regulating inner core to probe into of the container cavity being arranged on shell, with the pad of the distance of the inner core fiber end face and vibrating diaphragm that regulate interior core fibre front end; And the thickness of described pad is 1-1000 micron.
2. optical-fiber microphone probe according to claim 1, be is characterized in that described inner core end is provided with spring shim and lock ring successively, is fixedly connected, is fixed in the container cavity of shell by inner core by lock ring and shell.
3. optical-fiber microphone probe according to claim 1, is characterized in that the reflective surface of described vibrating diaphragm is provided with gold nano reflector layer, and the thickness of gold nano reflector layer is 10-500 nanometer.
4. optical-fiber microphone probe according to claim 1, is characterized in that described vibrating diaphragm is the micro-vibrating diaphragm of titanium foil, stainless steel foil, nickel foil or silicon; The thickness of vibrating diaphragm is 1-10 micron.
5. optical-fiber microphone probe according to claim 1, is characterized in that described interior core fibre is monomode fiber or multimode fiber.
6. optical-fiber microphone probe according to claim 1, it is characterized in that described reflection cavity is FP interference cavity, and interior core fibre is monomode fiber.
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| CN201310077501.5A CN103152684B (en) | 2013-03-12 | 2013-03-12 | Optical-fiber microphone probe |
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| CN201310077501.5A CN103152684B (en) | 2013-03-12 | 2013-03-12 | Optical-fiber microphone probe |
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| CN103152684B true CN103152684B (en) | 2015-12-02 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103994818B (en) * | 2014-06-05 | 2016-03-02 | 中国科学院电子学研究所 | Optical fiber FP chamber sound wave sensing probe |
| CN105784100A (en) * | 2016-04-25 | 2016-07-20 | 陈丽 | Sound detecting and sensing probe |
| CN107911782B (en) * | 2017-11-16 | 2020-04-07 | 中国电子科技集团公司第三研究所 | Optical fiber microphone probe and optical fiber microphone system |
| CN107907203A (en) * | 2017-11-30 | 2018-04-13 | 大连理工大学 | A kind of demodulation method of optical fiber F P cavate sonic sensors |
| CN110160625A (en) * | 2019-05-22 | 2019-08-23 | 华中科技大学 | A kind of low-frequency sound wave sensor |
| CN113905299A (en) * | 2021-10-11 | 2022-01-07 | 维沃移动通信有限公司 | Microphone structure and electronic equipment |
| CN114112002B (en) * | 2021-11-08 | 2023-08-18 | 北京信息科技大学 | Vibrating-diaphragm-free interference type optical fiber acoustic sensor probe and optical fiber acoustic sensor |
| CN115656341A (en) * | 2022-11-03 | 2023-01-31 | 江苏光微半导体有限公司 | Quantum sound wave sensor based on MEMS technology and array voiceprint system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2834067Y (en) * | 2005-06-28 | 2006-11-01 | 深圳市豪恩电声科技有限公司 | Optical fibre microphone |
| CN102833660A (en) * | 2011-06-16 | 2012-12-19 | 霍尼韦尔国际公司 | Optical microphone |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| NO315177B1 (en) * | 2001-11-29 | 2003-07-21 | Sinvent As | Optical offset sensor |
| CA3090851C (en) * | 2010-03-15 | 2023-03-07 | The Board Of Trustees Of The Leland Stanford Junior University | Optical-fiber-compatible acoustic sensor |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2834067Y (en) * | 2005-06-28 | 2006-11-01 | 深圳市豪恩电声科技有限公司 | Optical fibre microphone |
| CN102833660A (en) * | 2011-06-16 | 2012-12-19 | 霍尼韦尔国际公司 | Optical microphone |
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Effective date of registration: 20170527 Address after: 100015 No. 4, building 15, building 7, No. 417, Jiuxianqiao North Road, Beijing, Chaoyang District Patentee after: Beijing CLP Sound Technology Co., Ltd. Address before: 100015 Jiuxianqiao North Road, Beijing, No. B, No., No. 7 Patentee before: No.3 Institute of China Electronics Technology Group Corporation |