CN1128863A - Photoelectric sound sensor - Google Patents
Photoelectric sound sensor Download PDFInfo
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- CN1128863A CN1128863A CN 95111239 CN95111239A CN1128863A CN 1128863 A CN1128863 A CN 1128863A CN 95111239 CN95111239 CN 95111239 CN 95111239 A CN95111239 A CN 95111239A CN 1128863 A CN1128863 A CN 1128863A
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Abstract
The photoelectric type acoustic sensor is composed of sound source, light source, diaphragm, gobo (or lens or reflector or beam splitter) and optical detector. The characteristic lies in that the diaphragm vibration caused by the sound wave is changed into electric signal by the optical method, the amplitude of the electric signal is directly proportional to the amplitude of the diaphragm vibration. Its advantages are wide frequency response, capable of approching to tero Hz, high sensitivity and low cost. It can be applied in the remote sound detecting device, acoustic locating radar and can also be used to make infrasound sensor, high grade microphone and pressure sensor.
Description
The present invention relates to sonic transducer with the photovoltaic making.
As everyone knows, in the sonic transducer category, utilized several physical.As the moving-coil type sonic transducer, its structure is to paste one group of coil behind the diaphragm of impression vibration, and coil places a permanent magnetic field, and the coil movement cutting magnetic line is finished sensing function to produce induction current.The sonic transducer of this form can be described as magneto-electric.In addition, can finish condenser type sonic transducer, the resistance-type sonic transducer in addition of sensing.In the condenser type sonic transducer, what directly change is electric capacity, as Electret condenser microphone; In the resistance-type sonic transducer, what directly change is resistance, as the granular microphone in the telephone set.Yet in existing sonic transducer, the cost height that has, the frequency response that has is narrow, and especially infrasound sensor does not generally have outstanding linearity and letter price ratio.
Existing photoelectric sound sensor majority is made light transmission path with optical fiber, as United States Patent (USP) " the photoelectric sensing equipment and the method for the piano voice " (patent No.: 5231283), be a kind of sonic transducer that is used for key; (patent No.: be a kind of sensor that is used for liquid 5247490), their formation has all been used optical fiber to United States Patent (USP) " photovoltage force transducer ", and the scope of application is all very limited.
The objective of the invention is to ring scope in order to seek a kind of high sensitivity, super wideband, and the acoustic detection technology not high to the environment for use conditional request.
Principle of the present invention is the vibration with sound, at first changes the variation (light intensity or phase of light wave) of the parameter of light into, is converted into electric signal with photo-detector then, finishes sensing function, therefore, is called photoelectric sound sensor.
Photoelectric sound sensor of the present invention is made up of sound source (sound wave), light source (light wave), diaphragm, light barrier (or lens or catoptron or beam splitting chip) and photo-detector.After sound wave and light wave enter diaphragm, make diaphragm vibration modulation light beam and import photo-detector, photo-detector is converted to electric signal output with the variation of its optical parameter, finishes sensing function (seeing accompanying drawing 1).
Photoelectric sound sensor of the present invention is to cause by sound wave that diaphragm vibration, the vibration of diaphragm directly cause to impinge upon light detector light intensity on the face generation electric signal that changes that looses.That is to say that the present invention adopts optical means to extract the film vibration signal, the amplitude of electric signal is proportional to the film Oscillation Amplitude, additional hardly other quality and mechanical resistance on the diaphragm of induction sound wave.Therefore, extension frequency responding range widely, especially low side can expand near 0Hz, and high frequency response depends on the response of film, because of the sensitivity of photoelectric sound sensor is to be determined by membrane tension, diameter and light-source brightness, only be subject to the characteristic frequency of diaphragm, therefore, the sonic transducer height that the remolding sensitivity of its phonoreception is general, the weight because of light is zero again, this sonic transducer does not influence result of use regardless of putting the orientation.As seen photoelectric sound sensor of the present invention, not only frequency response is wide, highly sensitive, and volume is little, with low cost, can be used for remote acoustic detection equipment, acoustics station keeping radar, also can be used to make high-grade microphone and uses as a kind of pressure transducer.
Description of drawings:
Fig. 1 principle of the invention block scheme
The photo-electric sound sensing synoptic diagram of Fig. 2 aperture modulation system
Fig. 3 lighting point intensification modulation photo-electric sound sensing synoptic diagram
Fig. 4 coherent illumination high sensitivity photoelectricity sound sensing synoptic diagram
By embodiment, further specify the present invention in conjunction with Fig. 2-Fig. 3.
Embodiment 1, sees accompanying drawing 2.
Diaphragm 1 and light barrier 2 positioned vertical, light barrier 2 is very thin very light metallic films, is attached to diaphragm 1 center, has a light emitting diode to make light source 3 in light barrier one side, the photo-detector 4 that it is slit that opposite side has a receiving aperture.When vibrating when diaphragm 1 induction sound wave, light barrier 2 produces displacement with the film vibration, and the light wave that light source 3 sends is gone into photo-detector 4 by light barrier cutting modulation is laggard, and the electric signal that produces acoustic vibration is exported.
Embodiment 2, see accompanying drawing 3.
One side of diaphragm 1 is mounted with orthogonal lens L
1, L
2, and a beam splitting chip 5 that certain angle is arranged is arranged between two mirrors, at lens L
2There is a photo-detector 4 on the right side, and light source 3 is the less light beam of an angle of divergence.Lens L
1Shining on the diaphragm 1 after the light focusing, by beam splitting chip 5 and lens L
2On detector 4, when vibrating when diaphragm 1 induction sound wave, film vibrates the variation that causes lighting point brightness lighting point imaging on the film, and therefore, the brightness of elephant is also along with variation, so produce the electric signal output of acoustic vibration.
Embodiment 3 sees accompanying drawing 4.
One side of diaphragm 1 is mounted with catoptron L
3With photo-detector 4, at catoptron L
3And to be mounted with beam splitting chip 5, a light source 3 with certain angle between the light detector are the less light beams of an angle of divergence.When the incident coherent light beam is divided into two-beam through beam splitting chip 5, a branch of light is to catoptron L
3Return beam splitting chip 5, see through a part to detector 4.Another Shu Guangzhao returns beam splitting chip 5 to diaphragm 1, and antireflection part is to photo-detector 4.Therefore, the two-beam that shines on the photo-detector 4 produces interference fringe, forms coherent detection.Diaphragm 1 induction acoustic vibration causes the variation of its beam reflected relative phase, and the interference fringe on the detector 4 produces laterally and moves, so produce the electric signal output of acoustic vibration.
Claims (4)
1, photoelectric sound sensor, it is characterized in that it is made of sound source, light source, diaphragm, light barrier (or lens or catoptron or beam splitting chip) and photo-detector, after sound wave causes the diaphragm vibration, make diaphragm vibration modulation light beam and import photo-detector, photo-detector is converted to electric signal output with the variation of optical parameter, finishes sensing function.
2, according to claim 1 described photoelectric sound sensor, it is characterized in that light barrier (2) positioned vertical is under diaphragm (1), light barrier one side has a light source (3), it is the photo-detector of slit (4) that opposite side has a receiving aperture, when vibrating when diaphragm (1) induction sound wave, light barrier (2) produces displacement, the light wave that light source (3) sends with the film vibration, entered detector (4) after the light barrier cutting modulation, produced the electric signal of acoustic vibration.
3,, it is characterized in that a side of diaphragm (1) is mounted with orthogonal lens L according to claim 1 described photoelectric sound sensor
1, L
2, and a beam splitting chip (5) is arranged between two mirrors, at lens L
2There is a photo-detector (4) on the right side, and light source (3) is the less light beam of an angle of divergence, lens L
1Shining on the diaphragm (1) after the light focusing, by beam splitting chip (5) and lens L
2Lighting point imaging on the film on detector (4), when vibrating when diaphragm (1) induction sound wave, cause the variation of lighting point brightness, so the brightness of elephant is also along with variation, so produce the electric signal of acoustic vibration.
4,, it is characterized in that a side of diaphragm (1) is mounted with catoptron L according to claim 1 described photoelectric sound sensor
3And photo-detector (4), at catoptron L
3And be mounted with a beam splitting chip (5) between the photo-detector (4), and light source (3) is the less light beam of an angle of divergence, the incident coherent light beam is divided into two-beam through beam splitting chip (5), respectively through catoptron L
3And diaphragm (1), again through see through and antireflection part light to photo-detector (4), the two-beam that shines on the photo-detector (4) produces interference fringe, form coherent detection, diaphragm (1) is responded to sound wave and is vibrated, cause the variation of its beam reflected relative phase, the interference fringe on the detector (4) just produces laterally and moves, and produces the electric signal of acoustic vibration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95111239 CN1128863A (en) | 1995-02-07 | 1995-02-07 | Photoelectric sound sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95111239 CN1128863A (en) | 1995-02-07 | 1995-02-07 | Photoelectric sound sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1128863A true CN1128863A (en) | 1996-08-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95111239 Pending CN1128863A (en) | 1995-02-07 | 1995-02-07 | Photoelectric sound sensor |
Country Status (1)
| Country | Link |
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| CN (1) | CN1128863A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100493443C (en) * | 2006-12-29 | 2009-06-03 | 华南师范大学 | Real-time acousto-optic imaging method and device based on acoustic lens and laminated reflective film inspection |
| CN100493442C (en) * | 2006-12-29 | 2009-06-03 | 华南师范大学 | Real-time acousto-optic imaging method based on acoustic lens and polarizing inspection |
| CN101360350B (en) * | 2007-07-30 | 2012-08-29 | 深圳市豪恩电声科技有限公司 | Digital microphone |
| CN104502892A (en) * | 2014-12-10 | 2015-04-08 | 北京智谷睿拓技术服务有限公司 | Positioning method, positioning device and user equipment |
| CN109471157A (en) * | 2018-12-27 | 2019-03-15 | 中国科学院声学研究所 | A kind of high sensitivity infrasound sensor |
-
1995
- 1995-02-07 CN CN 95111239 patent/CN1128863A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100493443C (en) * | 2006-12-29 | 2009-06-03 | 华南师范大学 | Real-time acousto-optic imaging method and device based on acoustic lens and laminated reflective film inspection |
| CN100493442C (en) * | 2006-12-29 | 2009-06-03 | 华南师范大学 | Real-time acousto-optic imaging method based on acoustic lens and polarizing inspection |
| CN101360350B (en) * | 2007-07-30 | 2012-08-29 | 深圳市豪恩电声科技有限公司 | Digital microphone |
| CN104502892A (en) * | 2014-12-10 | 2015-04-08 | 北京智谷睿拓技术服务有限公司 | Positioning method, positioning device and user equipment |
| CN104502892B (en) * | 2014-12-10 | 2018-02-02 | 北京智谷睿拓技术服务有限公司 | Localization method, positioner and user equipment |
| CN109471157A (en) * | 2018-12-27 | 2019-03-15 | 中国科学院声学研究所 | A kind of high sensitivity infrasound sensor |
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| SE01 | Entry into force of request for substantive examination | ||
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| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |