File:Photoacoustic spectroscope.svg

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DescriptionPhotoacoustic spectroscope.svg	English: Exemplary assembly of a photoacoustic spectroscope for gas analysis with an acoustic cell. Resonance ocours at a wavelength of double the resonator length. Instead of a chopper wheel, variation of the absorption could also be achieved with a tunable laser, modulating its frequency across absorption wavelength. Additional λ/4 tube elements could be added for example in the gas inlet to prevent unwanted flow noises. Electronic control elements, especially a lock-in amplifier, are not shown. Light source (e. g. Laser) Chopper wheel semipermeable mirrors form an optical resonance system cell windows (tilted for polarisation) gas flow inlet and outlets buffer gas volumes acoustic sensor (e. g. microphone or transducer) resonator Deutsch: Beispielhafter Aufbau eines photoakustischen Spektroskops zur Gasanalyse mit einer Akustikzelle. Resonanz tritt bei einer Wellenlänge auf, die das Doppelte der Länge des Resonators beträgt. Statt der Verwendung eines Chopperrades kann eine Variation der Absorption auch mit einem stimmbaren Laser erreicht werden, indem dessen Frequenz rund um die Absorptionswellenlänge moduliert wird. Ergänzende λ/4-Rohre können zum Beispiel in der Zuleitung eingebaut werden, um unerwünschte Strömungsgeräusche zu verhindern. Elektronische Steuerbauteile, insbesondere ein Lock-In-Verstärker, sind nicht abgebildet. Lichtquelle (z. B. Laser) Chopperrad halbdurchlässige Spiegel bilden ein optisches Resonanzsystem Ein- und Austrittsfenster (zur Polarisierung geneigt) Zuleitung und Ableitungen des Gasflusses Gasvolumen zur Pufferung Akustiksensor (z. B. Mikrofon oder Transducer) Resonator
Date	15 August 2008
Source	own work, with the utilisation of Image:Laser-symbol.svg by Spooky. For References, see below.
Author	Hk kng
Permission (Reusing this file)	I, the copyright holder of this work, hereby publish it under the following license: This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license. You are free: to share – to copy, distribute and transmit the work to remix – to adapt the work Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original. CC BY-SA 3.0 truetrue

References

Frans J.M. Harren, Gina Cotti, Jos Oomens, and Sacco te Lintel Hekkert: Photoacoustic Spectroscopy in Trace Gas Monitoring, in: R.A. Meyers (Ed.): Encyclopedia of Analytical Chemistry, Chichester 2000, ISBN 0471976709, S. 2203–2226
US patent 7263871 (2007-9-4) Selker et al. System and method for gas analysis using doubly resonant photoacoustic spectroscopy

English: This image was created as part of the Philip Greenspun illustration project.

File history

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	Date/Time	Dimensions	User	Comment
current	12:33, 29 August 2008	1,365 × 800 (50 KB)	Hk kng	readability
	22:32, 17 August 2008	1,365 × 800 (52 KB)	Hk kng
	15:42, 15 August 2008	1,365 × 800 (53 KB)	Hk kng	(minor rendering problems corrected
	15:05, 15 August 2008	1,365 × 800 (51 KB)	Hk kng	{{Information \|Description={{en\|Exemplary assembly of a photoacoustic spectroscope for gas analysis with an acoustic cell. Resonance ocours at a wavelength of double the resonator length. Instead of a chopper wheel, variation of the absorption could also