Applied Physics B

, Volume 77, Issue 4, pp 381–385 | Cite as

Ultra-sensitive ambient ammonia detection using CO2-laser-based photoacoustic spectroscopy

  • M.B. Pushkarsky
  • M.E. WebberEmail author
  • C.K.N. Patel
Rapid communication


An ambient trace-ammonia sensor that uses resonant photoacoustic spectroscopy and a line-tunable CO2 laser has been developed. This system achieves a 1σ replicate precision of 32 parts-per-trillion (ppt) with an averaging time of 5 s and a total measurement time of 40 s. This 32-ppt precision corresponds to a minimum detectable fractional absorbance of 8.8×10-9, a minimum detectable absorption coefficient of 9.6×10-10 cm-1, and a minimum path-length-normalized detectivity of 1.1×10-8 W cm-1/Hz1/2. Background interference from CO2, H2O, and cell-window absorption were subtracted by switching to a neighboring off-resonance laser wavelength .


Spectroscopy Ammonia Absorption Coefficient Measurement Time Laser Wavelength 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  1. 1.Pranalytica, Inc. Santa MonicaUSA

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