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Updated: May 12, 2026

Three-dimensional Optical-resolution Photoacoustic Microscopy
Published on: May 3, 2011
High sensitivity trace gas detection by cantilever-enhanced photoacoustic spectroscopy using a mid-infrared
Jari Peltola1, Markku Vainio, Tuomas Hieta
1Laboratory of Physical Chemistry, Department of Chemistry, P.O. Box 55 (A.I. Virtasen aukio 1), FIN-00014 University of Helsinki, Finland.
Abstract:
Highly sensitive cantilever-enhanced photoacoustic detection of hydrogen cyanide and methane in the mid-infrared region is demonstrated. A mid-infrared continuous-wave frequency tunable optical parametric oscillator was used as a light source in the experimental setup. Noise equivalent detection limits of 190 ppt (1 s) and 65 ppt (30 s) were achieved for HCN and CH(4), respectively. The normalized noise equivalent absorption coefficient is 1.8 × 10(-9) W cm(-1) Hz(-1/2).
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