CN203859873U - Optical fiber solid vibration microphone - Google Patents
Optical fiber solid vibration microphone Download PDFInfo
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- CN203859873U CN203859873U CN201420197104.1U CN201420197104U CN203859873U CN 203859873 U CN203859873 U CN 203859873U CN 201420197104 U CN201420197104 U CN 201420197104U CN 203859873 U CN203859873 U CN 203859873U
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- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The utility model discloses an optical fiber solid vibration microphone. The microphone is based on inertial vibration detection and laser beam splitting interference principle and is used for measuring sound vibration signals transmitted in the solid medium. The optical fiber solid vibration microphone comprises a laser drive circuit, a laser, an optical fiber light guide unit, an optical fiber solid vibration microphone probe, a light front end and a signal processing unit, wherein the optical fiber solid vibration microphone probe is divided into a vibration coupling unit and an optical fiber sensing unit; the vibration coupling unit converts vibration signals in the solid medium into the relative displacement between a vibration sensitivity mass block and the optical fiber sensing unit, the change of phase difference between signal reflection light and reference reflection light inside the optical fiber sensing unit is caused, the light intensity signals are thus modulated and conversion from vibration signals to light signals is realized. The optical fiber solid vibration microphone has the advantages that anti-electromagnetic interference is facilitated, remote sensing and transmission can be carried out, sensitivity is good, the signal-to-noise ratio is high, the frequency response range is wide, and the like.
Description
Technical field
The utility model relates to technical field of optical fiber sensing, and specifically, the utility model relates to a kind of optical fiber solid vibration microphone based on inertial oscillation detection and laser spectral interference principle.
Background technology
Sound can be propagated by elastic fluids such as gas, liquid and solids.Microphone is the device that the sound vibration signal to propagating in elastic fluid picks up, changes and transmits, as microphone, hydrophone etc.The propagation of sound in solid has the application of many reality.The microphone that sound wave in solid is surveyed, according to the difference of its operation principle, can be divided into the sound-electric change type microphones such as piezoelectric type, pressure resistance type, condenser type, and sound-optical-electric change type microphone; The most conventional with piezoelectric type again in sound-electric change type microphone.
Sound-electric change type microphone is a kind of device that is converted to signal of telecommunication output by sound vibration signal, is mainly made up of vibration sensing mass, elastomeric element, conversion element, metal shell and/or preposition electronic amplification circuit.Such microphone, based on principle of inertia, is made a response to vibration signal by sensitive-mass piece, the electric parameter of change conversion element, and through output electrical signals after electronic circuit conversion and amplification, or direct output electrical signals; The type microphone is easily subject to electromagnetic interference, and signal transmission attenuation is large, is not suitable for applying in complex electromagnetic environment, the region such as Keep Clear-High Voltage, is also not suitable for long-distance sensing, transmission application.
Optical fiber solid vibration microphone based on optical fiber sensing technology, according to its modulated mode difference, can have the types such as intensity modulated, phase-modulation, wavelength-modulated, frequency modulation(FM) and polarization state modulation.As chosen intensity modulation type optical fibre vibration sensor as sound-optical transducing unit in the number of patent application Chinese patent application that is 200910242527.9, though be not vulnerable to electromagnetic interference, signal transmission attenuation is little, this shortcoming that microphone exists sensitivity and signal to noise ratio is low, frequency response range is narrower.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of optical fiber solid vibration microphone, solve sound-electric change type solid vibration microphone and be subject to electromagnetic interference, problem that signal transmission attenuation is large, make up the sensitivity of existing intensity modulation type optical fibre vibration sensor and signal to noise ratio low, the deficiency that frequency response range is narrow simultaneously.
For achieving the above object, the utility model adopts following scheme: the optical fiber solid vibration microphone based on inertial oscillation detection and laser spectral interference principle, comprise transmitter body, described transmitter body is made up of drive circuit for laser, laser, optical fiber guidance unit, microphone probe, light front end and signal processing unit; The output of drive circuit for laser is connected with the input of laser; The output of laser is connected with the port I of optical fiber guidance unit through launching fiber; The port II of optical fiber guidance unit is connected with microphone probe through Transmission Fibers; The input of light front end is connected with the port III of optical fiber guidance unit through receiving optical fiber; The output of light front end is connected with the input of signal processing unit; The feedback end of signal processing unit is connected with drive circuit for laser, and the output of signal processing unit is as the vibration signal reduction output of transmitter body.
Wherein, described vibration microphone probe comprises housing, vibration coupling unit and Fibre Optical Sensor unit.
Described housing comprises outside framework and upper plate; Outside framework is the column of hollow, and it is mainly made up of sidewall, lower shoe and back shroud, and sidewall is the central column of up/down perforation, and back shroud and lower shoe cover respectively upper shed and the lower opening of sidewall; Upper plate is across in the inner chamber of above-mentioned outside framework, and the edge of upper plate is connected with the inside sidewalls face of outside framework, and outside framework is divided into upper cavity and lower chamber two parts by upper plate; Vibration coupling cellular installation is in lower chamber, and Fibre Optical Sensor cellular installation is in upper cavity; Lower surface and the solid dielectric of lower shoe fit tightly.
Described vibration coupling unit involving vibrations sensitive-mass piece and elastomeric element; Vibration sensing mass is solid cylinder, smooth being affixed of medial surface of the side of vibration sensing mass and the sidewall of outside framework; The upper surface of vibration sensing mass and the central authorities of lower surface are respectively provided with the prominent ring in center of a ring-type, and the axle center of Tu Huan axle center, Zhe Liangge center and vibration sensing mass is overlapping; Be arranged in the prominent ring in center of upper surface of vibration sensing mass and be manufactured with reflective membrane region; Elastomeric element comprises elastomeric element I and elastomeric element II; Elastomeric element I is supported between vibration sensing mass and lower shoe, the upper surface of elastomeric element I directly contacts with the projection of the lower surface of vibration sensing mass, and the lower surface of elastomeric element I contacts with lower shoe prominent ring the in the periphery of this lip-deep ring-type by processing; Elastomeric element II is supported between vibration sensing mass and upper plate, the lower surface of elastomeric element II directly contacts with the projection of the upper surface of vibration sensing mass, and the upper surface of elastomeric element II contacts with upper plate prominent ring the in the periphery of this lip-deep ring-type by processing; The center position of elastomeric element II and upper plate is provided with the loophole of up/down perforation.
Described Fibre Optical Sensor unit comprises corner cube mirror and fiber optic collimator unit; Corner cube mirror is arranged on the upper surface of upper plate; A right angle face of corner cube mirror is parallel with the reflective membrane region on vibration sensing mass, and just right with the loophole of upper plate, and another right angle face is parallel with the outgoing end face of described fiber optic collimator unit; The tail optical fiber of fiber optic collimator unit is that the perforate that Transmission Fibers is offered on the sidewall of outside framework is drawn.
In addition, the edge of described upper plate and the madial wall of outside framework are by being flexibly connected.
Cavity inside between described lower shoe and elastomeric element I is filled with silicone oil.
Described fiber optic collimator unit is made up of Transmission Fibers, glass capillary, GRIN Lens and coupling sleeve; The internal diameter of the external diameter of glass capillary, the external diameter of GRIN Lens and described coupling sleeve is consistent, glass capillary and GRIN Lens are embedded in coupling sleeve simultaneously, GRIN Lens is positioned near corner cube mirror one side, and glass capillary is positioned near outside framework sidewall one side; Glass capillary internal diameter mates with the fibre core of Transmission Fibers, and one end of Transmission Fibers is embedded in the internal diameter of glass capillary, and the perforate that the other end of Transmission Fibers is offered on the sidewall of outside framework is drawn.
On the exit facet of described fiber optic collimator unit, be coated with part reflectance coating or anti-reflection film.
On two right angle faces of corner cube mirror, be all coated with anti-reflection film.
Described optical fiber guidance unit is optical fiber circulator or fiber coupler.
Light front end is made up of photodiode and coupled preamplifier, wherein the input of photodiode is connected with optical fiber guidance unit, the output of photodiode connects the input of preamplifier, and the output of preamplifier is connected with signal processing unit.
Described drive circuit for laser is controlled modulation current source.
Compared with prior art, the utlity model has following advantage:
(1) in the process that optical fiber solid of the present utility model vibration microphone picks up and changes solid sound vibration signal without the participation of the signal of telecommunication, be output as light signal and pass through Optical Fiber Transmission, neither produce electromagnetic signal, be not subject to the interference of electromagnetic signal yet, can be applied in highfield, high-intensity magnetic field or strong radiofrequency field environment, can also carry out remote sensing and transmission.
(2) optical fiber solid vibration microphone probe of the present utility model adopts laser spectral interference principle, by the situation of change of Real-Time Monitoring light front end output signal DC component, adjust laser drive current in good time, thereby change the centre wavelength of laser Output of laser signal, ensure that probe is all the time in the sensitiveest state.The utility model optical fiber solid vibrates the advantages such as microphone has sensitivity and signal to noise ratio is high, and frequency response range is wide.
Brief description of the drawings
Fig. 1 is the system block diagram of optical fiber solid vibration microphone of the present utility model.
Fig. 2 is the vertical section structural map of optical fiber solid vibration microphone probe of the present utility model.
In Fig. 1,1. drive circuit for laser, 2. laser, 3. launching fiber, 4. optical fiber guidance unit, 41. port I, 42. port II, 43. port III, 5. Transmission Fibers, 6. optical fiber solid vibration microphone probe, 7. receives optical fiber, 8. smooth front end, 9. signal processing unit.
In Fig. 2,611. sidewalls, 612. lower shoes, 613. elastomeric element I, 614. vibration sensing masses, 615. elastomeric element II, 616. upper plate, 617. back shrouds, 621. reflective membrane regions, 622. right-angle reflecting prism, 623. fiber optic collimator unit, 623a. GRIN Lens, 623b. glass capillary, 623c. mates sleeve.
Embodiment
Below in conjunction with accompanying drawing, the preferred specific embodiment of optical fiber solid vibration microphone of the present utility model is elaborated.
Fig. 1 shows a kind of system block diagram of the optical fiber solid vibration microphone based on inertial oscillation detection and laser spectral interference principle.This optical fiber solid vibration microphone comprises transmitter body, and described transmitter body is made up of drive circuit for laser 1, laser 2, optical fiber guidance unit 4, microphone probe 6, light front end 8 and signal processing unit 9; The output of drive circuit for laser 1 is connected with the input of laser 2; The output of laser 2 is connected with the port I41 of optical fiber guidance unit 4 through launching fiber 3; The port II42 of optical fiber guidance unit 4 is connected with microphone probe through Transmission Fibers 5; The input of light front end 8 is connected with the port III43 of optical fiber guidance unit 4 through receiving optical fiber 7; The output of light front end 8 is connected with the input of signal processing unit 9; The feedback end of signal processing unit 9 is connected with drive circuit for laser 1, and the output of signal processing unit 9 is as the vibration signal reduction output of transmitter body.Described signal processing unit 9 can be by vibration signal demodulation out, simultaneously by the DC component situation of change of monitoring light front end 8 output signals, feedback control signal is to drive circuit for laser 1, regulate laser 2 operating currents, thereby change laser 2 Output of laser centre wavelengths, ensure that probe is all the time in the sensitiveest state; By the alternating current component in the voice bandwidth ranges in the output voltage signal of extraction light front end 8, can export with the sound vibration signal in detected solid dielectric and change consistent voltage signal or be reduced to voice signal.
Described LASER Light Source is for can launch monochromatic semiconductor laser, and can adopt centre wavelength is the DFB type semiconductor laser of 1310nm or 1550nm, and its centre wavelength can change along with the variation of drive current.In addition, described drive circuit for laser 1 is controlled modulation current source, and its reception comes from signal processing unit 9 control signal of exporting and the rectilinear oscillation signal that comes from conventional high-frequency generator output, for laser 2 provides operating current.
Launching fiber 3, Transmission Fibers 5 and reception optical fiber 7 are monomode fiber, and can transmitted in both directions light signal.Optical fiber guidance unit 4 is optical fiber circulator or fiber couplers of a kind of three ports, also can be a kind of optical fiber circulator or fiber coupler of four ports, reality has only been used wherein three ports, and all the other no ports are connected to light absorption material.
Light front end 8 is made up of photodiode and coupled direct current mutual resistance formula preamplifier, wherein the input of photodiode is connected with optical fiber guidance unit 4, the output of photodiode connects the input of preamplifier, the output of preamplifier is connected with signal processing unit 9, is output as linearity and is proportional to the voltage signal of inputting light intensity signal.The DC component of described direct current mutual resistance formula preamplifier output signal can characterization probe sensitivity state, and as the low-frequency control signal input of drive circuit for laser 1.
Fig. 2 is the vertical section structural map of optical fiber solid vibration microphone probe 6 of the present utility model.Wherein, described vibration microphone probe 6 comprises housing, vibration coupling unit 61 and Fibre Optical Sensor unit 62.
Described housing comprises outside framework and upper plate 616; Outside framework is the column of hollow, and it is mainly made up of sidewall 611, lower shoe 612 and back shroud 617, and sidewall 611 is the central column of up/down perforation, and back shroud 617 and lower shoe 612 cover respectively upper shed and the lower opening of sidewall 611; Upper plate 616 is across in the inner chamber of above-mentioned outside framework, and the edge of upper plate 616 is connected with the sidewall of outside framework 611 medial surfaces, outside framework is divided into upper cavity and lower chamber two parts by upper plate 616, by regulating described upper plate 616 deep position in the circular ring structure of described outside framework, can change the resonance frequency of vibration coupling unit.The circular ring structure of described lower shoe and described outside framework is rigidly connected by welding, gluing or screw thread.Vibration coupling unit 61 is arranged in lower chamber, and Fibre Optical Sensor unit 62 is arranged in upper cavity; Lower surface and the solid dielectric of lower shoe 612 fit tightly.
Described vibration coupling unit 61 involving vibrations sensitive-mass piece 614 and elastomeric elements; Vibration sensing mass 614 is solid cylinder, and polishing is all passed through with the medial surface phase veneer of the sidewall of outside framework 611 in the side of vibration sensing mass 614, can reduce like this rubbing action producing due to the two relative motion in vibration detection process; The upper surface of vibration sensing mass 614 and the central authorities of lower surface are respectively provided with the prominent ring in center of a ring-type, and the axle center of Tu Huan axle center, Zhe Liangge center and vibration sensing mass 614 is overlapping; Be arranged in the prominent ring in center of upper surface of vibration sensing mass 614 and be manufactured with reflective membrane region 621; Elastomeric element comprises elastomeric element I613 and elastomeric element II615, can be vibration sensing mass 614 elastic restoring force is provided; Elastomeric element I613 is supported between vibration sensing mass 614 and lower shoe 612, the upper surface of elastomeric element I613 directly contacts with the projection of the lower surface of vibration sensing mass 614, and the lower surface of elastomeric element I613 contacts with lower shoe 612 prominent ring the in the periphery of this lip-deep ring-type by processing; Elastomeric element II615 is supported between vibration sensing mass 614 and upper plate 616, the lower surface of elastomeric element II615 directly contacts with the projection of the upper surface of vibration sensing mass 614, and the upper surface of elastomeric element II615 contacts with upper plate 616 prominent ring the in the periphery of this lip-deep ring-type by processing; The center position of elastomeric element II615 and upper plate 616 is provided with the loophole of up/down perforation.
Described Fibre Optical Sensor unit 62 comprises corner cube mirror 622 and fiber optic collimator unit 623; Corner cube mirror 622 is arranged on the upper surface of upper plate 616; A right angle face of corner cube mirror 622 is parallel with the reflective membrane region 621 on vibration sensing mass 614, and just right with the loophole of upper plate 616, and another right angle face is parallel with the outgoing end face of described fiber optic collimator unit 623; The tail optical fiber of fiber optic collimator unit 623 is that the perforate that Transmission Fibers 5 is offered on the sidewall 611 of outside framework is drawn.
In addition, between described lower shoe 612 and described elastomeric element I613, and there is an oscillation space between described upper plate 616 and described elastomeric element II615.In space between described lower shoe 612 and described elastomeric element I613, be filled with a part of silicone oil, to serve as acoustic damping, regulate the Q value of vibration coupling unit, improve frequency response characteristic.
Described fiber optic collimator unit 623 is made up of Transmission Fibers 5, glass capillary 623b, GRIN Lens 623a and coupling sleeve 623c; The internal diameter of the external diameter of glass capillary 623b, the external diameter of GRIN Lens 623a and described coupling sleeve 623c is consistent, glass capillary 623b and GRIN Lens 623a are embedded in coupling sleeve 623c simultaneously, GRIN Lens 623a is positioned near corner cube mirror 622 1 sides, and glass capillary 623b is positioned near outside framework sidewall 611 1 sides; Glass capillary 623b internal diameter mates with the fibre core of Transmission Fibers 5, and one end of Transmission Fibers 5 is embedded in the internal diameter of glass capillary 623b, and the perforate that the other end of Transmission Fibers 5 is offered on the sidewall 611 of outside framework is drawn.At the relative position of coupling sleeve 623c internal regulation glass capillary 623b and GRIN Lens 623a, upper adhesive curing can obtain fiber optic collimator unit 623, also can directly buy ready-made fiber optic collimator unit 62.
On the exit facet of described fiber optic collimator unit 623, be coated with part reflectance coating, using antireflection part laser as with reference to reverberation; Or on the exit facet of described fiber optic collimator unit 623, plate anti-reflection film, approximately 4% the incident light that only uses that Transmission Fibers end face reflects is as with reference to reverberation.On two right angle faces of corner cube mirror 622, be all coated with anti-reflection film.
A kind of course of work of the optical fiber solid vibration microphone based on inertial oscillation detection and laser spectral interference principle is as follows: described laser 2 is driven by drive circuit for laser 1, launch one-wavelength laser, transfer to described optical fiber guidance unit 4 through launching fiber 3, guided to the port 42 of optical fiber guidance unit 4 by the port 41 of optical fiber guidance unit 4, transfer to optical fiber solid vibration microphone probe 6 through Transmission Fibers 5; Inner at microphone probe, a part of laser is through Transmission Fibers 5 end face reflections, or through the reflectance coating reflection of the outgoing end face of fiber optic collimator unit 623, as with reference to reverberation; Install the mutual alignment of right-angle reflecting prism 622 and fiber optic collimator unit 623 according to fixed position after, fine setting fiber optic collimator unit 623, make the light beam by 623 outgoing of fiber optic collimator unit, after the reflective membrane region 621 on reflecting slant and the vibration sensing mass 614 of right-angle reflecting prism 622, can at utmost be reflected back optical fiber collimation 623 inside, unit, as signal reflex light with interfere with reference to reverberation, thereby obtain modulated light intensity signal.Vibration coupling unit 61 can be converted to the relative displacement between vibration sensing mass 614 and outside framework by the vibration signal in solid dielectric, thereby change the light path of signal reflex light, cause signal reflex light and change with reference to the phase difference between reverberation, thereby modulation light intensity signal, realizes picking up and sound-optical conversion solid vibration signal.Modulated laser signal transfers to optical fiber guidance unit 4 through Transmission Fibers 5, port II42 by optical fiber guidance unit 4 guides to port III43, transfer to light front end 8 through reception optical fiber 7 and carry out opto-electronic conversion, demodulate original vibration signal through signal processing unit 9, then carry out filtering, amplification and Digital Signal Processing, final output changes the consistent signal of telecommunication with surveyed solid sound vibration signal and is reduced to voice signal.
Claims (10)
1. optical fiber solid vibration microphone, comprise transmitter body, it is characterized in that, described transmitter body is mainly made up of drive circuit for laser (1), laser (2), optical fiber guidance unit (4), microphone probe (6), light front end (8) and signal processing unit (9); The output of drive circuit for laser (1) is connected with the input of laser (2); The output of laser (2) is connected with the port I (41) of optical fiber guidance unit (4) through launching fiber (3); The port II (43) of optical fiber guidance unit (4) is connected with microphone probe through Transmission Fibers (5); The input of light front end (8) is connected with the port III (43) of optical fiber guidance unit (4) through receiving optical fiber (7); The output of light front end (8) is connected with the input of signal processing unit (9); The feedback end of signal processing unit (9) is connected with drive circuit for laser (1), and the output of signal processing unit (9) is as the vibration signal reduction output of transmitter body.
2. optical fiber solid vibration microphone according to claim 1, is characterized in that, described vibration microphone probe (6) comprises housing, vibration coupling unit (61) and Fibre Optical Sensor unit (62);
Described housing comprises outside framework and upper plate (616); Outside framework is the column of hollow, it is mainly made up of sidewall (611), lower shoe (612) and back shroud (617), sidewall (611) is the central column of up/down perforation, and back shroud (617) and lower shoe (612) cover respectively upper shed and the lower opening of sidewall (611); Upper plate (616) is across in the inner chamber of above-mentioned outside framework, and the edge of upper plate (616) is connected with sidewall (611) medial surface of outside framework, and outside framework is divided into upper cavity and lower chamber two parts by upper plate (616); Vibration coupling unit (61) is arranged in lower chamber, and Fibre Optical Sensor unit (62) are arranged in upper cavity; Lower surface and the solid dielectric of lower shoe (612) fit tightly;
Described vibration coupling unit (61) involving vibrations sensitive-mass piece (614) and elastomeric element; Vibration sensing mass (614) is solid cylinder, smooth being affixed of medial surface of the sidewall (611) of the side of vibration sensing mass (614) and outside framework; The upper surface of vibration sensing mass (614) and the central authorities of lower surface are respectively provided with the prominent ring in center of a ring-type, and the axle center of Tu Huan axle center, Zhe Liangge center and vibration sensing mass (614) is overlapping; Be arranged in the prominent ring in center of upper surface of vibration sensing mass (614) and be manufactured with reflective membrane region (621); Elastomeric element comprises elastomeric element I (613) and elastomeric element II (615); Elastomeric element I (613) is supported between vibration sensing mass (614) and lower shoe (612), the upper surface of elastomeric element I (613) directly contacts with the projection of the lower surface of vibration sensing mass (614), and the lower surface of elastomeric element I (613) is dashed forward to encircle in the periphery of this lip-deep ring-type by processing and contacted with lower shoe (612); Elastomeric element II (615) is supported between vibration sensing mass (614) and upper plate (616), the lower surface of elastomeric element II (615) directly contacts with the projection of the upper surface of vibration sensing mass (614), and the upper surface of elastomeric element II (615) is dashed forward to encircle in the periphery of this lip-deep ring-type by processing and contacted with upper plate (616); The center position of elastomeric element II (615) and upper plate (616) is provided with the loophole of up/down perforation;
Described Fibre Optical Sensor unit (62) comprises corner cube mirror (622) and fiber optic collimator unit (623); Corner cube mirror (622) is arranged on the upper surface of upper plate (616); A right angle face of corner cube mirror (622) is parallel with the reflective membrane region (621) on vibration sensing mass (614), and just right with the loophole of upper plate (616), another right angle face is parallel with the outgoing end face of described fiber optic collimator unit (623); The tail optical fiber of fiber optic collimator unit (623) is that the perforate that Transmission Fibers (5) is offered on the sidewall (611) of outside framework is drawn.
3. optical fiber solid according to claim 2 vibration microphone, is characterized in that: the edge of described upper plate (616) with the madial wall of outside framework by being flexibly connected.
4. optical fiber solid vibration microphone according to claim 2, is characterized in that: the cavity inside between described lower shoe (612) and elastomeric element I (613) is filled with silicone oil.
5. optical fiber solid vibration microphone according to claim 2, is characterized in that: described fiber optic collimator unit (623) is made up of Transmission Fibers (5), glass capillary (623b), GRIN Lens (623a) and coupling sleeve (623c); External diameter, the external diameter of GRIN Lens (623a) and the internal diameter of described coupling sleeve of glass capillary 623b are consistent, glass capillary (623b) and GRIN Lens (623a) are embedded in coupling sleeve (623c) simultaneously, GRIN Lens (623a) is positioned near corner cube mirror (622) one sides, and glass capillary (623b) is positioned near outside framework sidewall (611) one sides; Glass capillary (623b) internal diameter mates with the fibre core of Transmission Fibers (5), one end of Transmission Fibers (5) is embedded in the internal diameter of glass capillary (623b), and the perforate that the other end of Transmission Fibers (5) is offered on the sidewall (611) of outside framework is drawn.
6. optical fiber solid vibration microphone according to claim 2, is characterized in that: on the exit facet of described fiber optic collimator unit (623), be coated with part reflectance coating or anti-reflection film.
7. optical fiber solid vibration microphone according to claim 2, is characterized in that: on two right angle faces of corner cube mirror (622), be all coated with anti-reflection film.
8. optical fiber solid vibration microphone according to claim 1, is characterized in that: described optical fiber guidance unit (4) is optical fiber circulator or fiber coupler.
9. optical fiber solid vibration microphone according to claim 1, it is characterized in that: light front end (8) is made up of photodiode and coupled preamplifier, wherein the input of photodiode is connected with optical fiber guidance unit (4), the output of photodiode connects the input of preamplifier, and the output of preamplifier is connected with signal processing unit (9).
10. optical fiber solid vibration microphone according to claim 1, is characterized in that, described drive circuit for laser (1) is controlled modulation current source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420197104.1U CN203859873U (en) | 2014-04-22 | 2014-04-22 | Optical fiber solid vibration microphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420197104.1U CN203859873U (en) | 2014-04-22 | 2014-04-22 | Optical fiber solid vibration microphone |
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| Publication Number | Publication Date |
|---|---|
| CN203859873U true CN203859873U (en) | 2014-10-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420197104.1U Expired - Lifetime CN203859873U (en) | 2014-04-22 | 2014-04-22 | Optical fiber solid vibration microphone |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113423051A (en) * | 2021-08-23 | 2021-09-21 | 深圳市微语信息技术开发有限公司 | High-sensitivity anti-interference light conduction sound pickup and sound pickup method thereof |
| WO2022048588A1 (en) * | 2020-09-04 | 2022-03-10 | 华为技术有限公司 | Laser microphone and terminal |
-
2014
- 2014-04-22 CN CN201420197104.1U patent/CN203859873U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022048588A1 (en) * | 2020-09-04 | 2022-03-10 | 华为技术有限公司 | Laser microphone and terminal |
| CN113423051A (en) * | 2021-08-23 | 2021-09-21 | 深圳市微语信息技术开发有限公司 | High-sensitivity anti-interference light conduction sound pickup and sound pickup method thereof |
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