CN112556822A - Optical microphone structure based on thin film type grating - Google Patents
Optical microphone structure based on thin film type grating Download PDFInfo
- Publication number
- CN112556822A CN112556822A CN202011415031.5A CN202011415031A CN112556822A CN 112556822 A CN112556822 A CN 112556822A CN 202011415031 A CN202011415031 A CN 202011415031A CN 112556822 A CN112556822 A CN 112556822A
- Authority
- CN
- China
- Prior art keywords
- grating
- film
- laser
- thin film
- optical microphone
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 18
- 239000010409 thin film Substances 0.000 title claims description 20
- 239000010408 film Substances 0.000 claims description 25
- 238000010586 diagram Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Abstract
The invention discloses an optical microphone structure based on a film type grating, which comprises a laser, a film grating and a photoelectric detector, wherein the laser is arranged on one side of the film grating and provides a light source for the film grating, and the photoelectric detector is arranged on the other side of the film grating and is used for receiving a diffraction pattern of the light source of the laser after passing through the film grating.
Description
Technical Field
The invention relates to the field of optical devices, in particular to an optical microphone structure based on a thin film type grating.
Background
The traditional optical microphone utilizes the reflected light of the film, forms diffraction through the grating, and finally calculates the information of sound waves according to the diffracted light, so the structure is complex and the calculation is relatively difficult; compared with the traditional microphone, the optical microphone has the advantages of higher sensitivity and wider detection range, and is the main trend of microphone development in the future; based on various types of optical microphones, the types are mainly classified into types with a thin film and types without a thin film; compared with the traditional film type optical microphone and the novel film grating microphone, the novel film grating microphone has the advantages of simple structure, strong anti-interference capability, higher sensitivity and the like, and therefore, the problem that technical personnel urgently need to solve in the related field is to design an optical microphone structure based on the film type grating.
Disclosure of Invention
In order to solve the technical problems, the technical scheme provided by the invention is as follows: an optical microphone structure based on a film type grating comprises a laser, a film grating and a photoelectric detector, wherein the laser is arranged on one side of the film grating and provides a light source for the film grating, and the photoelectric detector is arranged on the other side of the film grating and is used for receiving a diffraction pattern of the light source of the laser after passing through the film grating.
As an improvement, the laser and the photoelectric detector are oppositely arranged at the center of the thin film grating.
As an improvement, the size of the thin film grating is larger than the cross section size of the laser and the photoelectric detector.
After adopting the structure, the invention has the following advantages: the invention combines the vibration film of the traditional optical microphone with the diffraction grating, utilizes the effective deformation of the film to influence the grating so as to cause the change of the diffraction light, and calculates the vibration condition of the sound wave according to the change of the diffraction light.
Drawings
Fig. 1 is a schematic structural diagram of an optical microphone structure based on a thin film type grating according to the present invention.
Fig. 2 is a schematic structural diagram of a thin film grating in an optical microphone structure based on a thin film type grating according to the present invention.
As shown in the figure: 1. laser 2, thin film grating 3, and photoelectric detector.
Detailed Description
With reference to the accompanying drawings, an optical microphone structure based on a thin film type grating comprises a laser 1, a thin film grating 2 and a photoelectric detector 3, wherein the laser 1 is arranged on one side of the thin film grating 2 and provides a light source for the thin film grating 2, and the photoelectric detector 3 is arranged on the other side of the thin film grating 2 and is used for receiving a diffraction pattern of the light source of the laser 1 after passing through the thin film grating 2.
As a preferred embodiment of this embodiment, the laser 1 and the photodetector 3 are oppositely disposed at the center of the thin film grating 2.
In a preferred embodiment of this embodiment, the size of the thin film grating 2 is larger than the cross-sectional sizes of the laser 1 and the photodetector 3.
When the film grating vibration generator is specifically implemented, firstly, the film grating device is arranged near a sound source, and the vibration of sound waves causes the effective vibration of the film grating and the deformation of the film grating; then, when a light source emitted by a laser passes through the film gratings with different deformation quantities, the diffraction pattern changes; and finally, detecting different diffracted lights by the detector, and finally obtaining the frequency and amplitude of the sound wave through calculation.
The present invention and its embodiments have been described above, and the description is not intended to be limiting, and the drawings are only one embodiment of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (3)
1. The optical microphone structure based on the film type grating is characterized by comprising a laser, the film grating and a photoelectric detector, wherein the laser is arranged on one side of the film grating and provides a light source for the film grating, and the photoelectric detector is arranged on the other side of the film grating and is used for receiving a diffraction pattern of the light source of the laser after passing through the film grating.
2. The film-type grating-based optical microphone structure as claimed in claim 1, wherein the laser and the photodetector are oppositely disposed at the center of the film grating.
3. The optical microphone structure as claimed in claim 1, wherein the size of the thin film grating is larger than the cross-sectional size of the laser and the photodetector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011415031.5A CN112556822A (en) | 2020-12-05 | 2020-12-05 | Optical microphone structure based on thin film type grating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011415031.5A CN112556822A (en) | 2020-12-05 | 2020-12-05 | Optical microphone structure based on thin film type grating |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112556822A true CN112556822A (en) | 2021-03-26 |
Family
ID=75059139
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011415031.5A Pending CN112556822A (en) | 2020-12-05 | 2020-12-05 | Optical microphone structure based on thin film type grating |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112556822A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106792298A (en) * | 2016-12-15 | 2017-05-31 | 北京快鱼电子股份公司 | A kind of fiber grating microphone and preparation method thereof |
-
2020
- 2020-12-05 CN CN202011415031.5A patent/CN112556822A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106792298A (en) * | 2016-12-15 | 2017-05-31 | 北京快鱼电子股份公司 | A kind of fiber grating microphone and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5066307B1 (en) | Optical microphone | |
| JP4308247B2 (en) | Optical fiber sensor system | |
| JP4093971B2 (en) | Optical movement information detection apparatus, movement information detection system, electronic apparatus and encoder | |
| JP2007183202A (en) | Method and apparatus for determining sound source direction | |
| US8813571B2 (en) | Optical microphone | |
| EP2160577B1 (en) | Method and apparatus for the simultaneous generation and detection of optical diffraction interference pattern on a detector | |
| CN107911782B (en) | Optical fiber microphone probe and optical fiber microphone system | |
| JP5232334B1 (en) | Optical microphone | |
| CN112556822A (en) | Optical microphone structure based on thin film type grating | |
| CN102833661B (en) | A kind of laser microphone | |
| CN111889894B (en) | Method and device for detecting laser cutting quality | |
| JPH08265262A (en) | Optical microphone | |
| GB1251713A (en) | ||
| CN211317502U (en) | Gear vibration mode detecting system | |
| JP2009005144A (en) | Sound collecting apparatus | |
| CN108279443A (en) | Fiber segment water based on sliding window principle listens system | |
| JP3253791B2 (en) | Fourier transform optical system | |
| JPS59148832A (en) | Optical fiber type underwater sound detector | |
| CN206235389U (en) | Vibrating sensor and the detecting system using the vibrating sensor | |
| CN103940676A (en) | Device and method for measuring Young modulus by linear frequency modulation double-beam laser heterodyne | |
| US7041964B2 (en) | Method and apparatus for improved collection efficiency of speckle based navigation sensors using lightpipes and reflectors | |
| JPH01185100A (en) | Optical microphone | |
| Faisal et al. | Improving Event Classification Using Gammatone Filter For Distributed Acoustic Sensing | |
| RU87534U1 (en) | ACOUSTOPTIC METER WITH APERTURE SYNTHESIS | |
| CN115684629A (en) | Quantum acoustic wave sensor and quantum voiceprint recognition system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210326 |
|
| RJ01 | Rejection of invention patent application after publication |