EP2039215A1 - Elektroakustischer wandler - Google Patents
Elektroakustischer wandlerInfo
- Publication number
- EP2039215A1 EP2039215A1 EP07763720A EP07763720A EP2039215A1 EP 2039215 A1 EP2039215 A1 EP 2039215A1 EP 07763720 A EP07763720 A EP 07763720A EP 07763720 A EP07763720 A EP 07763720A EP 2039215 A1 EP2039215 A1 EP 2039215A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sound
- electroacoustic transducer
- laser beam
- transducer according
- laser
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R23/00—Transducers other than those covered by groups H04R9/00 - H04R21/00
- H04R23/008—Transducers other than those covered by groups H04R9/00 - H04R21/00 using optical signals for detecting or generating sound
Definitions
- the novel microphone uses the influence of sound waves, more precisely their pressure fluctuations, on the speed of light of a laser beam, which traverses the medium of the sound field.
- the change in the speed of light ⁇ c is proportional to the sound pressure p.
- this small change .DELTA.c can be determined and then converted into an electrical signal proportional to the sound pressure. This is the output of the new microphone.
- the sound pressure deforms elastic components, e.g. a membrane.
- the deformation is converted into the electrical measurement signal.
- Sensitive, accurate and low-noise microphones are usually not sufficiently small and thus disturb the sound field to be measured.
- the speed of light in air decreases by 0.9 m / s when the air pressure is increased by 1 Pa.
- the one beam After the division at the mirror B, the one beam is guided through the sound field S on the path of the length Li.
- the other beam passes through the sound-isolated housing G on the path of length L2. Heath rays interfere behind the mirror C.
- the detector H determines the intensity of the light and outputs a proportional electrical signal.
- the source of radiation is a laser diode made of a powerful green laser pointer. It is a diode-pumped neodymium yttrium aluminum garnet laser (Nd: YAG laser) with frequency doubling. The wavelength is 532 nm, the output power is a maximum of 5 mW.
- the laser has been removed from the housing and mounted on the optical table by means of a holder element.
- beam splitter cubes are used, since they separate the beam cleaner, in comparison to a semitransparent mirror, ie do not cause any secondary reflections.
- silvered mirrors are used to achieve the highest possible reflectance.
- the detector is a photodiode that provides an output signal of 0.4 A / W with an already integrated preamplifier (Newport Battery Biased Silicon Pin Detector). The output of the detector is fed to a digital storage oscilloscope (Tektronix TDS220).
- the sound source is an Elac TM speaker connected to a small amplifier.
- the signals are generated by a function generator (KR-Lab Sweep Generator F 47).
- three sine tones generated by the tone generator at 500 Hz, 1 kHz and 2 kHz were measured by the diaphragmless microphone and displayed on the oscilloscope as a function of time.
- the microphone could be made small, robust and compact. His influence on the sound field would then be low.
- the principle of the invention can also be used in other media than air for sound measurement. - Thanks to the interference method between the two laser beams, changes in air pressure (weather, working altitude) have no effect.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT0108206A AT505021B1 (de) | 2006-06-27 | 2006-06-27 | Membranloses mikrophon mit hilfe von lichtinterferenz |
| PCT/AT2007/000311 WO2008000007A1 (de) | 2006-06-27 | 2007-06-26 | Elektroakustischer wandler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2039215A1 true EP2039215A1 (de) | 2009-03-25 |
| EP2039215B1 EP2039215B1 (de) | 2018-08-08 |
Family
ID=38441640
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP07763720.5A Active EP2039215B1 (de) | 2006-06-27 | 2007-06-26 | Elektroakustischer wandler |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US8301029B2 (de) |
| EP (1) | EP2039215B1 (de) |
| JP (1) | JP2009542128A (de) |
| CN (1) | CN101480068A (de) |
| AT (1) | AT505021B1 (de) |
| WO (1) | WO2008000007A1 (de) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3173781B8 (de) | 2015-11-25 | 2024-06-12 | Xarion Laser Acoustics GmbH | Luftgestütztes ultraschallprüfsystem für ein prüfobjekt |
| US10352911B2 (en) * | 2008-09-12 | 2019-07-16 | Balthasar Fischer | Airborne ultrasound testing system for a test object |
| KR101295941B1 (ko) * | 2008-09-12 | 2013-08-13 | 놀레스 일렉트로닉스 아시아 피티이 리미티드 | 음향 신호를 전기 신호로 변환하는 방법, 장치 및 컴퓨터 판독가능한 저장 매체 |
| WO2010116398A1 (ja) * | 2009-03-30 | 2010-10-14 | パナソニック株式会社 | 光超音波マイクロフォン |
| WO2011083760A1 (ja) * | 2010-01-07 | 2011-07-14 | パナソニック株式会社 | 光マイクロホン |
| EP2389014A1 (de) * | 2010-05-20 | 2011-11-23 | Nxp B.V. | Mikrofon |
| CN104052555B (zh) * | 2014-06-19 | 2016-04-27 | 北京交通大学 | 一种ofdm系统下无线信道多径参数估计的方法 |
| DE102014012364B4 (de) * | 2014-08-25 | 2019-02-14 | Microtech Gefell Gmbh | Trägheitsloser akustisch-optischer Analog-Digital-Umsetzer (ADU) zur Bestimmung der Dichte bzw. Dichteschwankungen von Gasen und Vorrichtungen zur Verarbeitung optischer Signale |
| US9906870B2 (en) * | 2016-02-15 | 2018-02-27 | Aalap Rajendra SHAH | Apparatuses and methods for sound recording, manipulation, distribution and pressure wave creation through energy transfer between photons and media particles |
| US11378551B2 (en) | 2019-05-01 | 2022-07-05 | Northrop Grumman Systems Corporation | Inspection devices with laser emitters and optical microphones, and related systems and methods |
| DE102019210073B4 (de) | 2019-07-09 | 2022-01-13 | Trumpf Gmbh + Co. Kg | Vorrichtung und Verfahren zur Durchführung ortsaufgelöster Photoakustik |
| DE102020112494A1 (de) | 2020-05-08 | 2021-11-11 | Jenoptik Automatisierungstechnik Gmbh | Verfahren zur Herstellung einer Airbag-Abdeckung mit einer Sollbruchlinie mit einem definierten Aufreißwiderstand |
| DE102020112495A1 (de) | 2020-05-08 | 2021-11-11 | Jenoptik Automatisierungstechnik Gmbh | Verfahren zur Prüfung einer Airbag-Abdeckung mit einer Sollbruchlinie mit definiertem Aufreißwiderstand |
| DE102022200623A1 (de) * | 2022-01-20 | 2023-07-20 | Robert Bosch Gesellschaft mit beschränkter Haftung | Prüfsystem und Prüfverfahren zur Dichtheitsprüfung einer Bipolarplatte |
Family Cites Families (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB386315A (en) | 1931-06-12 | 1933-01-12 | Christopher Clive Langton Greg | Microphonic apparatus for the transmission and reception of sound |
| GB2138234B (en) * | 1983-04-14 | 1986-10-08 | Standard Telephones Cables Ltd | Coherent reflectometer |
| JPS6018100A (ja) * | 1983-07-11 | 1985-01-30 | Yasushi Miki | マイクロホン |
| JPS6028100A (ja) | 1983-07-26 | 1985-02-13 | Nec Corp | 不揮発性半導体メモリ素子の書込み回路 |
| US5712840A (en) * | 1990-03-16 | 1998-01-27 | Canon Kabushiki Kaisha | Optical information recording/reproduciing apparatus having two-division detectors |
| DE19623504C1 (de) * | 1996-06-13 | 1997-07-10 | Deutsche Forsch Luft Raumfahrt | Optisches Mikrophon |
| US6301034B1 (en) * | 1997-10-22 | 2001-10-09 | John R. Speciale | Pulsed laser microphone |
| GB2330725B (en) * | 1997-10-24 | 2001-08-15 | Sony Uk Ltd | Microphone |
| US6014239C1 (en) * | 1997-12-12 | 2002-04-09 | Brookhaven Science Ass Llc | Optical microphone |
| US6147787A (en) * | 1997-12-12 | 2000-11-14 | Brookhaven Science Associates | Laser microphone |
| US6590661B1 (en) | 1999-01-20 | 2003-07-08 | J. Mitchell Shnier | Optical methods for selectively sensing remote vocal sound waves |
| US7391976B2 (en) * | 1999-12-13 | 2008-06-24 | Kabushiki Kaisha Kenwood | Optical acoustoelectric transducer |
| JP3858563B2 (ja) * | 2000-04-05 | 2006-12-13 | 株式会社日立製作所 | カーレンズモード同期可能な固体レーザー |
| IL152439A0 (en) * | 2002-10-23 | 2003-05-29 | Membrane-less microphone capable of functioning in a very wide range of frequencies and with much less distortions | |
| US7304005B2 (en) * | 2003-03-17 | 2007-12-04 | Semiconductor Energy Laboratory Co., Ltd. | Laser irradiation apparatus, laser irradiation method, and method for manufacturing a semiconductor device |
| US7465667B2 (en) * | 2004-03-08 | 2008-12-16 | E.I. Du Pont De Nemours And Company | Highly purified liquid perfluoro-n-alkanes and method for preparing |
| US7405826B2 (en) * | 2004-06-30 | 2008-07-29 | Gibbs Phillip R | Systems and methods for chiroptical heterodyning |
| WO2010116398A1 (ja) * | 2009-03-30 | 2010-10-14 | パナソニック株式会社 | 光超音波マイクロフォン |
-
2006
- 2006-06-27 AT AT0108206A patent/AT505021B1/de not_active IP Right Cessation
-
2007
- 2007-06-26 EP EP07763720.5A patent/EP2039215B1/de active Active
- 2007-06-26 CN CNA200780024294XA patent/CN101480068A/zh active Pending
- 2007-06-26 WO PCT/AT2007/000311 patent/WO2008000007A1/de not_active Ceased
- 2007-06-26 US US12/306,583 patent/US8301029B2/en active Active
- 2007-06-26 JP JP2009516812A patent/JP2009542128A/ja not_active Withdrawn
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2008000007A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| US8301029B2 (en) | 2012-10-30 |
| EP2039215B1 (de) | 2018-08-08 |
| US20090257753A1 (en) | 2009-10-15 |
| JP2009542128A (ja) | 2009-11-26 |
| AT505021B1 (de) | 2008-10-15 |
| WO2008000007A1 (de) | 2008-01-03 |
| AT505021A4 (de) | 2008-10-15 |
| CN101480068A (zh) | 2009-07-08 |
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