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
- 238000000034 method Methods 0.000 claims description 3
- 230000001427 coherent effect Effects 0.000 claims 1
- 230000002452 interceptive effect Effects 0.000 claims 1
- 239000012528 membrane Substances 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 206010021033 Hypomenorrhoea Diseases 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- -1 neodymium yttrium aluminum Chemical compound 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
- 229910019655 synthetic inorganic crystalline material Inorganic materials 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 229910019901 yttrium aluminum garnet Inorganic materials 0.000 description 1
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 |
---|---|---|---|---|
US10352911B2 (en) * | 2008-09-12 | 2019-07-16 | Balthasar Fischer | Airborne ultrasound testing system for a test object |
CN102150439B (zh) * | 2008-09-12 | 2015-04-22 | 楼氏电子亚洲有限公司 | 换能器***装置及方法 |
EP3173781B8 (de) | 2015-11-25 | 2024-06-12 | Xarion Laser Acoustics GmbH | Luftgestütztes ultraschallprüfsystem für ein prüfobjekt |
US8306429B2 (en) * | 2009-03-30 | 2012-11-06 | Panasonic Corporation | Optical ultrasonic microphone |
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***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 |
DE102020112495A1 (de) | 2020-05-08 | 2021-11-11 | Jenoptik Automatisierungstechnik Gmbh | Verfahren zur Prüfung einer Airbag-Abdeckung mit einer Sollbruchlinie mit definiertem Aufreißwiderstand |
DE102020112494A1 (de) * | 2020-05-08 | 2021-11-11 | Jenoptik Automatisierungstechnik Gmbh | Verfahren zur Herstellung einer Airbag-Abdeckung mit einer Sollbruchlinie mit einem definierten 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 |
US6147787A (en) * | 1997-12-12 | 2000-11-14 | Brookhaven Science Associates | Laser microphone |
US6014239C1 (en) * | 1997-12-12 | 2002-04-09 | Brookhaven Science Ass Llc | Optical microphone |
US6590661B1 (en) | 1999-01-20 | 2003-07-08 | J. Mitchell Shnier | Optical methods for selectively sensing remote vocal sound waves |
EP1239698A4 (de) * | 1999-12-13 | 2006-11-22 | Kenwood Corp | Optischer elektroakustischer wandler |
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 |
TW200613246A (en) * | 2004-03-08 | 2006-05-01 | Du Pont | Highly purified liquid perfluoro-n-alkanes and method for preparing |
WO2006004731A2 (en) * | 2004-06-30 | 2006-01-12 | Stheno Corporation | Systems and methods for chiroptical heterodyning |
US8306429B2 (en) * | 2009-03-30 | 2012-11-06 | Panasonic Corporation | Optical ultrasonic microphone |
-
2006
- 2006-06-27 AT AT0108206A patent/AT505021B1/de not_active IP Right Cessation
-
2007
- 2007-06-26 US US12/306,583 patent/US8301029B2/en active Active
- 2007-06-26 WO PCT/AT2007/000311 patent/WO2008000007A1/de active Application Filing
- 2007-06-26 CN CNA200780024294XA patent/CN101480068A/zh active Pending
- 2007-06-26 JP JP2009516812A patent/JP2009542128A/ja not_active Withdrawn
- 2007-06-26 EP EP07763720.5A patent/EP2039215B1/de active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2008000007A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2008000007A1 (de) | 2008-01-03 |
US20090257753A1 (en) | 2009-10-15 |
AT505021B1 (de) | 2008-10-15 |
AT505021A4 (de) | 2008-10-15 |
JP2009542128A (ja) | 2009-11-26 |
US8301029B2 (en) | 2012-10-30 |
CN101480068A (zh) | 2009-07-08 |
EP2039215B1 (de) | 2018-08-08 |
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