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.
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.
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Date | |
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.
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References
[edit]- 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
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current | 12:33, 29 August 2008 | 1,365 × 800 (50 KB) | Hk kng (talk | contribs) | readability | |
22:32, 17 August 2008 | 1,365 × 800 (52 KB) | Hk kng (talk | contribs) | |||
15:42, 15 August 2008 | 1,365 × 800 (53 KB) | Hk kng (talk | contribs) | (minor rendering problems corrected | ||
15:05, 15 August 2008 | 1,365 × 800 (51 KB) | Hk kng (talk | contribs) | {{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 |
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