File:Photoacoustic spectroscope.svg

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Description
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.

  1. Light source (e. g. Laser)
  2. Chopper wheel
  3. semipermeable mirrors form an optical resonance system
  4. cell windows (tilted for polarisation)
  5. gas flow inlet and outlets
  6. buffer gas volumes
  7. acoustic sensor (e. g. microphone or transducer)
  8. 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.

  1. Lichtquelle (z. B. Laser)
  2. Chopperrad
  3. halbdurchlässige Spiegel bilden ein optisches Resonanzsystem
  4. Ein- und Austrittsfenster (zur Polarisierung geneigt)
  5. Zuleitung und Ableitungen des Gasflusses
  6. Gasvolumen zur Pufferung
  7. Akustiksensor (z. B. Mikrofon oder Transducer)
  8. Resonator
Date
Source own work, with the utilisation of Image:Laser-symbol.svg by Spooky. For References, see below.
Author Hk kng
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References

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

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inception

15 August 2008

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current18:03, 29 August 2008Thumbnail for version as of 18:03, 29 August 20081,365 × 800 (50 KB)wikimediacommons>Hk kngreadability

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