EP2039215A1 - Transducteur électroacoustique - Google Patents

Transducteur électroacoustique

Info

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
Application number
EP07763720A
Other languages
German (de)
English (en)
Other versions
EP2039215B1 (fr
Inventor
Balthasar Fischer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
XARION Laser Acoustics GmbH
Original Assignee
NXP BV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NXP BV filed Critical NXP BV
Publication of EP2039215A1 publication Critical patent/EP2039215A1/fr
Application granted granted Critical
Publication of EP2039215B1 publication Critical patent/EP2039215B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; 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

L'invention concerne un transducteur électroacoustique comportant une source laser A et un récepteur de lumière H. Un champ sonore S permet de moduler la vitesse de propagation du faisceau laser selon la pression acoustique, pendant que ledit faisceau traverse le champ sonore S.
EP07763720.5A 2006-06-27 2007-06-26 Transducteur électroacoustique Active EP2039215B1 (fr)

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 (fr) 2006-06-27 2007-06-26 Transducteur électroacoustique

Publications (2)

Publication Number Publication Date
EP2039215A1 true EP2039215A1 (fr) 2009-03-25
EP2039215B1 EP2039215B1 (fr) 2018-08-08

Family

ID=38441640

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07763720.5A Active EP2039215B1 (fr) 2006-06-27 2007-06-26 Transducteur électroacoustique

Country Status (6)

Country Link
US (1) US8301029B2 (fr)
EP (1) EP2039215B1 (fr)
JP (1) JP2009542128A (fr)
CN (1) CN101480068A (fr)
AT (1) AT505021B1 (fr)
WO (1) WO2008000007A1 (fr)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102150439B (zh) 2008-09-12 2015-04-22 楼氏电子亚洲有限公司 换能器系统装置及方法
EP3173781B8 (fr) 2015-11-25 2024-06-12 Xarion Laser Acoustics GmbH Système d'essai par ultrasons en suspension dans l'air pour un objet de test
US10352911B2 (en) * 2008-09-12 2019-07-16 Balthasar Fischer Airborne ultrasound testing system for a test object
US8306429B2 (en) * 2009-03-30 2012-11-06 Panasonic Corporation Optical ultrasonic microphone
WO2011083760A1 (fr) * 2010-01-07 2011-07-14 パナソニック株式会社 Microphone optique
EP2389014A1 (fr) * 2010-05-20 2011-11-23 Nxp B.V. Microphone
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
EP3734267A1 (fr) 2019-05-01 2020-11-04 Northrop Grumman Innovation Systems, Inc. Dispositifs d'inspection comportant des émetteurs laser et des microphones optiques et systèmes et procédés associés
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
DE102020112495B4 (de) 2020-05-08 2026-04-16 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

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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
CN1213635C (zh) * 1999-12-13 2005-08-03 株式会社建伍 光学声电换能器
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
US7405826B2 (en) * 2004-06-30 2008-07-29 Gibbs Phillip R Systems and methods for chiroptical heterodyning
US8306429B2 (en) * 2009-03-30 2012-11-06 Panasonic Corporation Optical ultrasonic microphone

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Also Published As

Publication number Publication date
US20090257753A1 (en) 2009-10-15
US8301029B2 (en) 2012-10-30
JP2009542128A (ja) 2009-11-26
CN101480068A (zh) 2009-07-08
AT505021A4 (de) 2008-10-15
WO2008000007A1 (fr) 2008-01-03
AT505021B1 (de) 2008-10-15
EP2039215B1 (fr) 2018-08-08

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