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Updated: Aug 21, 2026

Three-dimensional Optical-resolution Photoacoustic Microscopy
Published on: May 4, 2011
Photoacoustic measurement of methane concentrations with a compact pulsed optical parametric oscillator
András Miklós1, Chin-How Lim, Wei-Wei Hsiang
1Institute of Physical Chemistry, University of Heidelberg, Germany.
Abstract:
A pulsed periodically poled lithium niobate optical parametric oscillator operating in a cavity with a grazing-incidence grating configuration was used for sensitive and precise measurement of trace quantities of methane in nitrogen by photoacoustic spectroscopy with a novel differential photoacoustic detector. A sensitivity of 1.2 parts in 10(9) by volume of methane was obtained in direct calibration measurements (not extrapolated). With this apparatus, in situ measurement of the methane concentration in ambient air under atmospheric conditions was demonstrated.
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