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Optimization of a microphone for photoacoustic spectroscopy
Klaus Wilcken1, Jyrki Kauppinen
1Laboratory of Optics and Spectroscopy, Department of Physics, 20014 University of Turku, Finland. klawil@utu.fi
Applied Spectroscopy
|November 13, 2003
Abstract:
The principles of optimizing a microphone for a photoacoustic detector in the nonresonant mode of operation are presented. Performance of the constructed optical cantilever microphone is compared to the commercial electret microphone by measuring the photoacoustic spectrum of methane with both systems. The sensitivity of the presented photoacoustic detector in the nonresonant mode of operation is 100 times higher with the optical cantilever microphone than with the electret microphone.