Near infrared photoacoustic detection of heptane in synthetic air

Lars Duggen, Mihaela Albu, Morten Willatzen, Horst-Günter Rubahn

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Trace contaminations of n-heptane in synthetic air is measured in the parts-per-billion (ppb) range using near infrared photoacoustic detection. We describe the fundamental theory used in the design of the photoacoustic cell for trace gas analysis and determine the detection limit of the cell. On the basis of a modified procedure from the American Clinical and Laboratory Standards Institute for the case that it is practically impossible to produce perfectly blank samples, a residual detection limit of 3 ppm n-heptane is confirmed. We investigate theoretically the impact of changing the buffer diameter on the window generated signal and find good correlation with previously reported experimental results.
Original languageEnglish
JournalAcustica United with Acta Acustica
Volume99
Issue number2
Pages (from-to)317-322
ISSN1610-1928
DOIs
Publication statusPublished - 2013

Keywords

  • Heptane
  • Infrared devices
  • Photoacoustic effect

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