CN108106715A - AC regeneration laser sound measurement method and device - Google Patents
AC regeneration laser sound measurement method and device Download PDFInfo
- Publication number
- CN108106715A CN108106715A CN201711436284.9A CN201711436284A CN108106715A CN 108106715 A CN108106715 A CN 108106715A CN 201711436284 A CN201711436284 A CN 201711436284A CN 108106715 A CN108106715 A CN 108106715A
- Authority
- CN
- China
- Prior art keywords
- signal
- laser
- module
- semiconductor laser
- amplified
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
- G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The present invention relates to a kind of AC regeneration laser sound measurement method and device, including：Laser is sent by the laser diode in semiconductor laser to be irradiated on intended vibratory object and be reflected back inside semiconductor laser, which detects to form photoelectric current through photodiode；By the way that direct current Photoelectric Detection module is gone to compensate the background DC level of photoelectric current photo-signal is exchanged with output after removal；Exchange photo-signal is amplified by gain adjustment module and feeds back to adjustable constant-flow source module；Amplified exchange photo-signal is combined by adjustable constant-flow source module and constant biasing forms the driving current of the laser diode in semiconductor laser, completes the feedback closed loop detection of vibration signal；By acquisition module to being acquired by the amplified AC signal of gain adjustment module, voice signal is formed after differential.The present invention can realize that faint sound signal distant-range high-precision is tested, and solve the problems, such as remote noisy environment interactive voice.
Description
Technical field
The present invention relates to laser sound measurement technical field, more particularly to one kind can realize that faint sound signal is remote
High precision measurement solves the problems, such as the AC regeneration laser sound measurement device of remote noisy environment interactive voice.
Background technology
Intelligent robot slowly becomes things familiar to people, and future is expected to welcome the growth of explosion type.Touch-control,
Gesture and voice are three big modes of current intelligence machine person to person interaction, and wherein interactive voice is more convenient, so more by green grass or young crops
It looks at.
Existing interactive voice hardware is then converted to the pattern of electric signal using vibrating diaphragm sensing acoustic pressure, be subject to background noise,
The multiple complicated factor such as other people acoustic jamming, echo, reverberation influences, and discrimination is caused to fluctuate or reduce a lot or even can not make
With, thus very there is an urgent need to develop a kind of effective remote pickup noise reduction solution to voice signal carry out noise reduction and
Reduction promotes the user experience of interactive voice.
Some research institutions and company also according to itself needing to devise various laser sound measurement methods, such as Austria just
Wound company Xarion Laser Acoustics, the optical microphone based on laser of exploitation are launched using laser
The carrier class infrared laser light beam of wavelength 1550nm, through Fabry-Perot etalon, (substantially two of spacing 2mm parallel
Optical mirror), record the minor variations of refractive index in medium caused by acoustic pressure.These minor variations change infrared laser light
These slight changes are converted into the measurement electric signal of sound by the wavelength of beam and transmission, optical microphone.But this method does not have still
There is the natural mode for breaking away from vibrating diaphragm sensing acoustic pressure, environmental noise can reflect the variation of medium refraction index, cause it in strong noise
Environmental applications are limited.
The content of the invention
It is contemplated that the defects of overcoming the prior art, faint sound signal distant-range high-precision can be realized by providing one kind
Test solves the problems, such as the AC regeneration laser sound measurement method and device of remote noisy environment interactive voice.
To achieve the above object, the present invention uses following technical scheme：
A kind of AC regeneration laser sound measurement method is provided, is included the following steps：
Step 1 is sent laser by the laser diode in semiconductor laser and is irradiated on intended vibratory object and anti-
It is emitted back towards inside the semiconductor laser, which detects to form light through the photodiode in the semiconductor laser
Electric current；
Step 2, by going direct current Photoelectric Detection module that the background DC level of the photoelectric current is compensated and removed
Output exchange photo-signal afterwards；
Step 3 is amplified the exchange photo-signal by gain adjustment module and feeds back to tabilized current power supply
Module；
Step 4 is formed by adjustable constant-flow source module with reference to the amplified exchange photo-signal and constant biasing
The driving current of laser diode in the semiconductor laser completes the feedback closed loop detection of vibration signal；
Step 5 is acquired by acquisition module to passing through the amplified AC signal of the gain adjustment module, through micro-
Voice signal is formed after point.
The laser diode is single mode semiconductor laser diodes.
The constant biasing is the adjustable constant biasing of voltage.
To achieve the above object, the present invention also uses following technical scheme：
A kind of AC regeneration laser sound measurement device is provided, including：Semiconductor laser removes direct current Photoelectric Detection mould
Block, gain adjustment module, adjustable constant-flow source module, acquisition module, constant biasing, intended vibratory object, the semiconductor laser
Include photodiode and laser diode inside device：
The semiconductor laser is irradiated to the intended vibratory object for sending laser by the laser diode
It goes up and is reflected back inside the semiconductor laser, which detects to form photoelectric current through the photodiode；
It is described that direct current Photoelectric Detection module is gone to be used for after the background DC level of the photoelectric current is compensated and removed
Output exchange photo-signal；
The gain adjustment module is used to be amplified the exchange photo-signal and feeds back to the adjustable constant-flow
Source module；
The adjustable constant-flow source module is used for reference to the amplified exchange photo-signal and the constant biasing shape
Into the driving current of the laser diode, the feedback closed loop detection of vibration signal is completed；
The acquisition module by the amplified AC signal of the gain adjustment module to being acquired, the shape after differential
Into voice signal.
The laser diode is single mode semiconductor laser diodes.
The constant biasing is the adjustable constant biasing of voltage.
The beneficial effects of the present invention are：Semiconductor laser laser is irradiated to intended vibratory object and is reflected back partly
Inside conductor laser, laser signal detects to form photoelectric current through semiconductor laser internal photo, which flows through
Direct current Photoelectric Detection module is gone, background DC level is compensated and exports the photo-signal exchanged with after removal, then by increasing
Beneficial adjustment module feeds back to adjustable constant-flow source module after being amplified, adjustable constant-flow source module combines the AC signal and adjustable
Constant biasing forms the driving current of semiconductor laser diode, completes the feedback closed loop detection of vibration signal.The program is with passing
The sound measurement device of system is compared, and can obtain lower noise, higher phase stability, so as to improve the voice signal of system
Demodulation accuracy.
Description of the drawings
Fig. 1 show the FB(flow block) of present invention stream feedback laser sound measurement method.
Fig. 2 is the structure chart of present invention stream feedback laser sound measurement device.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with attached drawing and specific implementation
Example, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only explaining this hair
It is bright, without being construed as limiting the invention.To achieve the above object, the present invention uses following technical scheme：
As illustrated in fig. 1 and 2, a kind of AC regeneration laser sound measurement method is provided, is included the following steps：
Step 1 sends laser by the laser diode in semiconductor laser 1 and is irradiated on intended vibratory object 7 simultaneously
It is reflected back inside the semiconductor laser 1, which detects shape through the photodiode in the semiconductor laser 1
Into photoelectric current, it is necessary to illustrate, include laser diode and photodiode inside the semiconductor laser 1；
Step 2, by going direct current Photoelectric Detection module 2 that the background DC level of the photoelectric current is compensated and removed
Output exchange photo-signal afterwards；
Step 3 is amplified the exchange photo-signal by gain adjustment module 3 and feeds back to tabilized current power supply
Module；
Step 4, by adjustable constant-flow source module 4 with reference to it is amplified it is described exchange 6 shape of photo-signal and constant biasing
Into the driving current of the laser diode in the semiconductor laser 1, the feedback closed loop detection of vibration signal is completed；
Step 5 is acquired by acquisition module 5 to passing through the 3 amplified AC signal of gain adjustment module, is passed through
Voice signal is formed after differential.
In one embodiment, the laser diode is single mode semiconductor laser diodes.
In one embodiment, the constant biasing 6 is the adjustable constant biasing of voltage.
To achieve the above object, the present invention also uses following technical scheme：
In embodiment as shown in Figure 2, a kind of AC regeneration laser sound measurement device is provided, including：Semiconductor laser
Device 1 removes direct current Photoelectric Detection module 2, gain adjustment module 3, adjustable constant-flow source module 4, acquisition module 5, constant biasing 6, mesh
Vibrating object 7 is marked, includes photodiode and laser diode inside the semiconductor laser 1：
The semiconductor laser 1 is irradiated to the intended vibratory object for sending laser by the laser diode
It on 7 and is reflected back inside the semiconductor laser 1, which detects to form photoelectric current through the photodiode；
It is described that direct current Photoelectric Detection module 2 is gone to be used for after the background DC level of the photoelectric current is compensated and removed
Output exchange photo-signal；
The gain adjustment module 3 is used to be amplified the exchange photo-signal and feeds back to the adjustable constant-flow
Source module 4；
The adjustable constant-flow source module 4 is used for reference to the amplified exchange photo-signal and the constant biasing 6
The driving current of the laser diode is formed, completes the feedback closed loop detection of vibration signal；
The acquisition module 5 by the 3 amplified AC signal of gain adjustment module to being acquired, after differential
Form voice signal.
In one embodiment, the laser diode is single mode semiconductor laser diodes.
In one embodiment, the constant biasing 6 is the adjustable constant biasing of voltage.
With reference to Fig. 1 and 2, semiconductor laser 1 emits laser and is irradiated to intended vibratory object 1 and is reflected back semiconductor laser
Inside device 1, laser signal detects to form photoelectric current through 1 internal photo of semiconductor laser, which flows through direct current
Photoelectric Detection module 2 compensates background DC level and exports the photo-signal exchanged with after removal, then by gain-adjusted
Module 3 feeds back to adjustable constant-flow source module 4 after being amplified, adjustable constant-flow source module 4 combines the AC signal and adjustable perseverance
Stream biasing 6 forms the driving current of semiconductor laser diode, completes the feedback closed loop detection of vibration signal.The program and tradition
Sound measurement device compare, lower noise, higher phase stability can be obtained, so as to improve the voice signal of system
Demodulation accuracy.
The specific embodiment of present invention described above, is not intended to limit the scope of the present invention..Any basis
Various other corresponding changes and deformation made by the technical concept of the present invention, should be included in the guarantor of the claims in the present invention
In the range of shield.
Claims (6)
- A kind of 1. AC regeneration laser sound measurement method, which is characterized in that include the following steps：Step 1 is sent laser by the laser diode in semiconductor laser and is irradiated on intended vibratory object and is reflected back Inside the semiconductor laser, which detects to form photoelectricity through the photodiode in the semiconductor laser Stream；It is step 2, defeated after the background DC level of the photoelectric current being compensated and removed by going direct current Photoelectric Detection module Go out to exchange photo-signal；Step 3 is amplified the exchange photo-signal by gain adjustment module and feeds back to adjustable constant-flow source module；Step 4, by adjustable constant-flow source module with reference to the amplified exchange photo-signal and described in constant biasing formed The driving current of laser diode in semiconductor laser completes the feedback closed loop detection of vibration signal；Step 5 is acquired by acquisition module to passing through the amplified AC signal of the gain adjustment module, after differential Form voice signal.
- 2. AC regeneration laser sound measurement method as described in claim 1, which is characterized in that the laser diode is single Mould semiconductor laser diode.
- 3. AC regeneration laser sound measurement method as claimed in claim 2, which is characterized in that the constant biasing is voltage Adjustable constant biasing.
- 4. a kind of AC regeneration laser sound measurement device, which is characterized in that including：Semiconductor laser goes direct current light electric-examination Survey module, gain adjustment module, adjustable constant-flow source module, acquisition module, constant biasing, intended vibratory object, the semiconductor Include photodiode and laser diode inside laser：The semiconductor laser is irradiated on the intended vibratory object simultaneously for sending laser by the laser diode It is reflected back inside the semiconductor laser, which detects to form photoelectric current through the photodiode；It is described that direct current Photoelectric Detection module is gone to be used to after the background DC level of the photoelectric current is compensated and removed export Exchange photo-signal；The gain adjustment module is used to be amplified the exchange photo-signal and feeds back to the tabilized current power supply mould Block；The adjustable constant-flow source module is used to form institute with reference to the amplified exchange photo-signal and the constant biasing The driving current of laser diode is stated, completes the feedback closed loop detection of vibration signal；The acquisition module by the amplified AC signal of the gain adjustment module to being acquired, the formation sound after differential Sound signal.
- 5. AC regeneration laser sound measurement device as claimed in claim 4, which is characterized in that the laser diode is single Mould semiconductor laser diode.
- 6. AC regeneration laser sound measurement device as claimed in claim 5, which is characterized in that the constant biasing is voltage Adjustable constant biasing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711436284.9A CN108106715A (en) | 2017-12-26 | 2017-12-26 | AC regeneration laser sound measurement method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711436284.9A CN108106715A (en) | 2017-12-26 | 2017-12-26 | AC regeneration laser sound measurement method and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108106715A true CN108106715A (en) | 2018-06-01 |
Family
ID=62213255
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711436284.9A Pending CN108106715A (en) | 2017-12-26 | 2017-12-26 | AC regeneration laser sound measurement method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108106715A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111060191A (en) * | 2019-12-27 | 2020-04-24 | 中国科学院长春光学精密机械与物理研究所 | Reflection type feedback phase-locked laser vibration measuring device and measuring method thereof |
| WO2022048588A1 (en) * | 2020-09-04 | 2022-03-10 | 华为技术有限公司 | Laser microphone and terminal |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06294680A (en) * | 1993-04-09 | 1994-10-21 | Res Dev Corp Of Japan | Semiconductor laser digital oscillatory displacement measuring equipment |
| US5838439A (en) * | 1997-03-14 | 1998-11-17 | Zang; De Yu | Heterodyned self-mixing laser diode vibrometer |
| CN101539454A (en) * | 2009-04-01 | 2009-09-23 | 南京师范大学 | Semiconductor laser self-mixing interference vibration meter |
| CN102169012A (en) * | 2011-01-11 | 2011-08-31 | 中国科学院上海光学精密机械研究所 | Method for improving vibration measurement precision of semiconductor laser sine phase modulation interferometer |
| CN203798446U (en) * | 2013-06-20 | 2014-08-27 | 梁彦忠 | Vibration detection circuit |
-
2017
- 2017-12-26 CN CN201711436284.9A patent/CN108106715A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06294680A (en) * | 1993-04-09 | 1994-10-21 | Res Dev Corp Of Japan | Semiconductor laser digital oscillatory displacement measuring equipment |
| US5838439A (en) * | 1997-03-14 | 1998-11-17 | Zang; De Yu | Heterodyned self-mixing laser diode vibrometer |
| CN101539454A (en) * | 2009-04-01 | 2009-09-23 | 南京师范大学 | Semiconductor laser self-mixing interference vibration meter |
| CN102169012A (en) * | 2011-01-11 | 2011-08-31 | 中国科学院上海光学精密机械研究所 | Method for improving vibration measurement precision of semiconductor laser sine phase modulation interferometer |
| CN203798446U (en) * | 2013-06-20 | 2014-08-27 | 梁彦忠 | Vibration detection circuit |
Non-Patent Citations (2)
| Title |
|---|
| 王路: "基于激光自混合干涉的微振动测量研究", 《中国优秀硕士学位论文全文数据库信息科技辑》 * |
| 黄贞: "基于半导体激光自混合干涉的振动测量研究与应用", 《中国博士学位论文全文数据库信息科技辑》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111060191A (en) * | 2019-12-27 | 2020-04-24 | 中国科学院长春光学精密机械与物理研究所 | Reflection type feedback phase-locked laser vibration measuring device and measuring method thereof |
| CN111060191B (en) * | 2019-12-27 | 2021-09-03 | 中国科学院长春光学精密机械与物理研究所 | Reflection type feedback phase-locked laser vibration measuring device and measuring method thereof |
| WO2022048588A1 (en) * | 2020-09-04 | 2022-03-10 | 华为技术有限公司 | Laser microphone and terminal |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101295941B1 (en) | Transducer system | |
| US11473898B2 (en) | Wearable voice-induced vibration or silent gesture sensor | |
| US20200213013A1 (en) | High-bandwidth underwater data communication system | |
| CN103983340B (en) | Microvibration measuring system and measuring method based on remote pulse laser speckle | |
| CN102721461A (en) | Detection device and detection method for semiconductor laser self-mixing infrasound | |
| CN108106715A (en) | AC regeneration laser sound measurement method and device | |
| EP3228026B1 (en) | Electronic device associated with a photovoltaic module to optimise the throughput of a bidirectional vlc transmission | |
| CN103424177B (en) | Method and device for improving sensitivity of reflecting-type laser vibration measurement system | |
| WO2017122099A1 (en) | Laser-based device utilizing multiple laser beams | |
| CN103152684B (en) | Optical-fiber microphone probe | |
| KR101686079B1 (en) | Apparatus and method for generating depth image | |
| US20230209278A1 (en) | Laser microphone and terminal | |
| US10448172B2 (en) | Laser-based apparatus utilizing multiple laser beams | |
| US10736811B2 (en) | Portable environment sensing device | |
| CN102738694A (en) | Method for realizing laser frequency stabilization by utilizing Fabry-Perot (F-P) interferometer | |
| CN103152685A (en) | F-P (Fabry-Perot) interference principle-based optical fiber microphone | |
| CN102833661B (en) | A kind of laser microphone | |
| CN113029217B (en) | Optical fiber acoustic sensing system based on Fabry-Perot etalon and optical microphone | |
| CN204085453U (en) | A kind of laser vibrometer, displacement transducer | |
| JP2017220935A (en) | Optical microphone, program therefor, control method, and hearing aid | |
| CN110763338B (en) | Energy feedback type hyperspectral imaging device based on acousto-optic tunable filter | |
| CN102589587A (en) | Improved short-term cross-correlation positioning method for chaos fiber fence system | |
| Donati et al. | Measurement of ambient vibration by self-mixing interferometry and its application to intrusion detection | |
| EP1380811A1 (en) | Optical distance measuring device | |
| Zhou et al. | MFCC based real-time speech reproduction and recognition using distributed acoustic sensing technology |
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: 20180601 |
|
| RJ01 | Rejection of invention patent application after publication |