CN103152684A - Optical-fiber microphone probe - Google Patents
Optical-fiber microphone probe Download PDFInfo
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- CN103152684A CN103152684A CN2013100775015A CN201310077501A CN103152684A CN 103152684 A CN103152684 A CN 103152684A CN 2013100775015 A CN2013100775015 A CN 2013100775015A CN 201310077501 A CN201310077501 A CN 201310077501A CN 103152684 A CN103152684 A CN 103152684A
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Abstract
The invention discloses an optical-fiber microphone probe. The optical-fiber microphone probe is characterized by comprising a vibrating diaphragm, a shell and an inner core, wherein the vibrating diaphragm is used for sensing sound vibration and is arranged at the front end of the shell, and the front end of the vibrating diaphragm is provided with a front cover for protecting the vibrating diaphragm; and the inner core is arranged in a containing cavity of the shell, and a reflecting cavity is formed by the end surface of the inner-core optical fiber at the front end of the inner-core optical fiber on the inner core and the vibrating diaphragm. The optical-fiber microphone probe disclosed by the invention is high in performance consistency, can form a strength optical-fiber microphone based on an FP(Fabry-Perot) interference principle, and has the characteristics of strong electromagnetic interference resistance, high sensitivity and easy array forming. In addition, the optical-fiber microphone probe is simple in structure, convenient in installation, debugging and production and low in cost and is suitable for being popularized widely.
Description
Technical field
The present invention relates to technical field of optical fiber sensing, relate in particular to a kind of intensity formula or FP interfere type fiber microphone of forming, be used for speech communication, sound-detection, and the fiber microphone probe in the fields such as noise testing.
Background technology
Microphone is a kind of for the reception voice signal, and finally is converted to the device of the signal of telecommunication.At present extensive use condenser microphone arranged, this microphone picks up voice signal by the electric capacity that conductive diaphragm and metal back electrode form, its principle is: acoustical vibration causes the conductive diaphragm vibration, cause electric capacity two anode-cathode distances to change, keep electric capacity two interpolar current potentials constant, sound causes that the capacitance stores electric weight changes, thereby 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 be joined a pre-amplification circuit, as impedance transformation, to guarantee that microphone can be connected with other circuit.Although condenser microphone has fabulous frequency response characteristic and higher sensitivity, by its operation principle as can be known, this microphone easily is subject to electromagnetic signal and disturbs, and therefore is not suitable for working under the electromagnetic environment of complexity.
For solving the problem that under complex electromagnetic environment, voice signal picks up, the fiber microphone based on optical fiber sensing technology has been proposed.The basic principle of fiber microphone is at first modulated light signal of voice signal, is loaded with the light signal of voice signal through opto-electronic conversion, finally becomes the signal of telecommunication, has completed picking up of voice signal.Because acoustical signal dim signal process is not subjected to electromagnetic interference, so fiber microphone has extremely strong anti-electromagnetic interference capability, can be in the electromagnetic environment normal operation of complexity.
In applications such as sound-detection, noise testings, the microphone group battle array that General Requirements uses is used, and exigent to the microphone consistency of performance, as close in sensitivity, phase place is unanimously high.The more ripe fiber microphone product of technology is mainly the intensity formula at present, as having put down in writing a kind of optical fiber microphone in practical new patent CN2834067Y, has put down in writing a kind of sensing head of optical fiber acoustic sensor in patent of invention CN101504311B.Although these fiber microphone probe technical feasibilities, owing to lacking adjustment structure, its consistency of performance guarantees very much, is unfavorable for that the group battle array of fiber microphone is used.Although put down in writing in utility model patent CN2834067Y in the optical fiber microphone structure and used pad, this pad and back cover are integrally formed, have therefore limited its function as adjustment structure, make the optical fiber microphone consistency of performance can not be guaranteed.
Summary of the invention
The present invention is directed to the proposition of above problem, and develop a kind of fiber microphone probe.The technological means that the present invention adopts is as follows:
A kind of fiber microphone probe is characterized in that comprising: the vibrating diaphragm, shell and the inner core that are used for the induction acoustical vibration; Described vibrating diaphragm is arranged on the front end of shell, and is provided with at the front end of vibrating diaphragm the front shroud that vibrating diaphragm is protected; Described inner core is arranged in the container cavity of shell, and inner core fiber end face and the vibrating diaphragm of the interior core fibre front end on inner core are formed with reflection cavity.
Described microphone probe also comprises and is used for regulating the degree of depth that inner core probes in the container cavity that is arranged on shell, with the pad of the distance of the inner core fiber end face of regulating interior core fibre front end and vibrating diaphragm; And the thickness of described pad is the 1-1000 micron.Described inner core end is equipped with spring shim and lock ring successively, is fixedly connected by lock ring and shell, inner core is fixed in the container cavity of shell.The reflective surface of described vibrating diaphragm is provided with the gold nano reflector layer, and the thickness of gold nano reflector layer is the 10-500 nanometer.Described vibrating diaphragm is the little vibrating diaphragm of titanium foil, stainless steel foil, nickel foil or silicon; The thickness of vibrating diaphragm is the 1-10 micron.Described interior core fibre is monomode fiber or multimode fiber.Described reflection cavity is the FP interference cavity, and inner core is monomode fiber.
The present invention compares with prior art, its advantage is apparent: this fiber microphone probe performance is unanimously high, can form the intensity formula and based on the fiber microphone of FP principle of interference, have the advantages that anti-electromagnetic interference capability is strong, highly sensitive, be easy to form array, can be widely used in speech communication, sound-detection, and the field such as noise testing.In addition, this microphone sonde configuration is simple, is convenient to install, debugging and producing, and with low costly is suitable for extensive popularization.
Description of drawings
Fig. 1 is fiber microphone sonde configuration schematic diagram of the present invention;
Fig. 2 is fiber microphone probe combined structure schematic diagram of the present invention;
Fig. 3 is fiber microphone operation principle schematic diagram of the present invention.
Embodiment
The fiber microphone probe comprises as depicted in figs. 1 and 2: the vibrating diaphragm 102, shell 103 and the inner core 105 that are used for the induction acoustical vibration; Described vibrating diaphragm 102 is arranged on the front end of shell 103, and is provided with at the front end of vibrating diaphragm 102 front shroud 101 that vibrating diaphragm is protected; 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 ends 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, be used for the sensitive sound vibration, inner core 105 be arranged on shell 103 inside can regulate by pad 104 in the distance of inner core fiber end face 109 and vibrating diaphragm 102 of core fibre 108 front ends (usually before inner core 105 is put into the container cavity of shell 103, pad 104 is put into the container cavity of shell 103, be stuck on the container cavity inwall or be stuck on the interior projection of container cavity, insert again inner core 105, put into the thickness of pad 104 by adjusting, reached the distance of regulating inner core fiber end face 109 and vibrating diaphragm 102), realize that acoustical signal is to the modulation of light signal, in addition, at inner core 105 ends mounting spring pad 106 successively and lock ring 107, lock ring 107 with by the fixing inner core 105 of shell 103,1 structural stability guarantees to pop one's head in.This structure is applicable to intensity formula fiber microphone and based on the fiber microphone of FP principle of interference.
Vibrating diaphragm is formed by laser welding technology by titanium foil, stainless steel foil or nickel foil, perhaps by the little vibrating diaphragm of the silicon of MEMS fabrication techniques.The thickness of vibrating diaphragm is the 1-10 micron.The reflective surface of vibrating diaphragm is manufactured with the gold nano reflector layer by magnetron sputtering technique, improving infrared reflection of light, thus the sensitivity that improves fiber microphone.The thickness of gold nano reflector layer is the 10-500 nanometer.
For guaranteeing the consistency of fiber microphone probe performance, adopt simplified structure design and flexible design.Aspect designs simplification, designed the inner core 105 of integrative-structure, aspect flexible, designed the distance that adopts replaceable pad 104 to control inner core fiber end face 109 and vibrating diaphragm 102.In assembling optical fiber microphone probe process be, can regulate by the pad 104 of different-thickness sensitivity and the phase place of fiber microphone, thereby guarantee the consistency of fibre-optical probe performance.The thickness of pad 104 is the 1-1000 micron.
The fiber microphone probe of the present invention's design can form intensity formula fiber microphone, as replace probe in the optical fiber microphone of putting down in writing in utility model patent CN2834067Y, be intensity formula fiber microphone, 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 of LED light source emission enters interior core fibre 108, and from 109 outgoing of inner core fiber end face to vibrating diaphragm 102, be reflected back interior core fibre 108 by vibrating diaphragm 102, the vibrating diaphragm vibration causes that intensity of reflected light changes, through opto-electronic conversion, obtain acoustical signal.
The fiber microphone probe of the present invention's design also can form the fiber microphone based on the FP principle of interference, and in this case, inner core 105 front end fiber end faces 109 form the FP interference cavity with vibrating diaphragm 102.Under this mode of operation, microphone adopts the LD laser as light source, interior core fibre 108 is monomode fibers, the course of work is as follows: the laser of LD laser emission enters in interior core fibre 108, light is at inner core fiber end face 109 antireflection part light, after vibrating diaphragm 102 reflections, a part of reverberation reenters in interior core fibre 108 from the light of inner core fiber end face 109 transmissions.The FP interference occurs in the light that the light of inner core fiber end face 109 reflections and vibrating diaphragm 102 reflections reenter in interior core fibre 108, and the interference light light signal is converted to the signal of telecommunication, namely realizes picking up of voice signal.
pop one's head in when fiber microphone of the present invention as shown in Figure 3 and be the probe based on the FP principle of interference, its operation principle is: the monochromatic light of LD laser emission enters the FP chamber of inner core fiber end face 109 and vibrating diaphragm 102 formation from interior core fibre 108, and formation interference light signal, if vibrating diaphragm is interfered light intensity Q point place in Fig. 3 when the equilbrium position, when sound causes the vibrating diaphragm vibration, cause FP chamber length to change, the FP change of cavity length that sound wave causes is very little, interference light intensity is changed near the Q point back and forth, through opto-electronic conversion, the light intensity signal that changes is become the signal of telecommunication, this signal of telecommunication is voice signal.
The above; only be the better embodiment of the present invention; but protection scope of the present invention is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; be equal to replacement or changed according to technical scheme of the present invention and inventive concept thereof, within all should being encompassed in protection scope of the present invention.
Claims (7)
1. a fiber microphone probe, is characterized in that comprising: the vibrating diaphragm, shell and the inner core that are used for the induction acoustical vibration;
Described vibrating diaphragm is arranged on the front end of shell, and is provided with at the front end of vibrating diaphragm the front shroud that vibrating diaphragm is protected;
Described inner core is arranged in the container cavity of shell, and inner core fiber end face and the vibrating diaphragm of the interior core fibre front end on inner core are formed with reflection cavity.
2. fiber microphone according to claim 1 is popped one's head in, it is characterized in that described microphone probe also comprises is used for regulating the degree of depth that inner core probes in the container cavity that is arranged on shell, with the pad of the distance of the inner core fiber end face of regulating interior core fibre front end and vibrating diaphragm; And the thickness of described pad is the 1-1000 micron.
3. fiber microphone probe according to claim 1 and 2, is characterized in that described inner core end is equipped with spring shim and lock ring successively, is fixedly connected by lock ring and shell, inner core is fixed in the container cavity of shell.
4. fiber microphone probe according to claim 1 and 2, it is characterized in that the reflective surface of described vibrating diaphragm is provided with the gold nano reflector layer, and the thickness of gold nano reflector layer is the 10-500 nanometer.
5. fiber microphone probe according to claim 1 and 2, is characterized in that described vibrating diaphragm is the little vibrating diaphragm of titanium foil, stainless steel foil, nickel foil or silicon; The thickness of vibrating diaphragm is the 1-10 micron.
6. fiber microphone probe according to claim 1 and 2, is characterized in that described interior core fibre is monomode fiber or multimode fiber.
7. fiber microphone probe according to claim 1 and 2, it is characterized in that described reflection cavity is the FP interference cavity, and interior core fibre is monomode fiber.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| CN103152684A true CN103152684A (en) | 2013-06-12 |
| CN103152684B CN103152684B (en) | 2015-12-02 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103994818A (en) * | 2014-06-05 | 2014-08-20 | 中国科学院电子学研究所 | Optical fiber FP cavity acoustic wave sensing probe |
| CN105784100A (en) * | 2016-04-25 | 2016-07-20 | 陈丽 | Sound detecting and sensing probe |
| 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 |
| CN107911782A (en) * | 2017-11-16 | 2018-04-13 | 中国电子科技集团公司第三研究所 | A kind of optical-fiber microphone probe and fiber microphone system |
| 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 |
| CN114112002A (en) * | 2021-11-08 | 2022-03-01 | 北京信息科技大学 | Vibration-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 |
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| WO2003046498A1 (en) * | 2001-11-29 | 2003-06-05 | Sinvent As | Optical displacement sensor |
| CN2834067Y (en) * | 2005-06-28 | 2006-11-01 | 深圳市豪恩电声科技有限公司 | Optical fibre microphone |
| WO2011115933A2 (en) * | 2010-03-15 | 2011-09-22 | The Board Of Trustees Of The Leland Stanford Junior University | Optical-fiber-compatible acoustic sensor |
| CN102833660A (en) * | 2011-06-16 | 2012-12-19 | 霍尼韦尔国际公司 | Optical microphone |
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2013
- 2013-03-12 CN CN201310077501.5A patent/CN103152684B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2003046498A1 (en) * | 2001-11-29 | 2003-06-05 | Sinvent As | Optical displacement sensor |
| CN2834067Y (en) * | 2005-06-28 | 2006-11-01 | 深圳市豪恩电声科技有限公司 | Optical fibre microphone |
| WO2011115933A2 (en) * | 2010-03-15 | 2011-09-22 | The Board Of Trustees Of The Leland Stanford Junior University | Optical-fiber-compatible acoustic sensor |
| CN102833660A (en) * | 2011-06-16 | 2012-12-19 | 霍尼韦尔国际公司 | Optical microphone |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103994818A (en) * | 2014-06-05 | 2014-08-20 | 中国科学院电子学研究所 | Optical fiber FP cavity acoustic wave sensing probe |
| CN105784100A (en) * | 2016-04-25 | 2016-07-20 | 陈丽 | Sound detecting and sensing probe |
| CN107911782A (en) * | 2017-11-16 | 2018-04-13 | 中国电子科技集团公司第三研究所 | A kind of optical-fiber microphone probe and fiber microphone system |
| 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 |
| CN114112002A (en) * | 2021-11-08 | 2022-03-01 | 北京信息科技大学 | Vibration-diaphragm-free interference type optical fiber acoustic sensor probe and optical fiber acoustic sensor |
| 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 |
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| CN103152684B (en) | 2015-12-02 |
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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 |