Cavity-enhanced cantilever-enhanced photo-acoustic spectroscopy

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http://hdl.handle.net/10138/301470

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Tomberg , T J , Hieta , T , Vainio , M M & Halonen , L O 2019 , ' Cavity-enhanced cantilever-enhanced photo-acoustic spectroscopy ' , Analyst , vol. 144 , no. 7 , pp. 2291-2296 . https://doi.org/10.1039/C9AN00058E

Title: Cavity-enhanced cantilever-enhanced photo-acoustic spectroscopy
Author: Tomberg, Teemu Joonatan; Hieta, Tuomas; Vainio, Markku Mikael; Halonen, Lauri Olavi
Contributor: University of Helsinki, Department
University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
Date: 2019-04-07
Language: eng
Number of pages: 6
Belongs to series: Analyst
ISSN: 0003-2654
URI: http://hdl.handle.net/10138/301470
Abstract: We have improved the sensitivity of a state-of-the-art cantilever-enhanced photo-acoustic trace gas sensor by combining it with an optical power build-up cavity. The build-up cavity enhances the photo-acoustic signal by a factor of approximate to 100, resulting in an exceptionally good normalised noise equivalent absorption (NNEA) value of 1.75 x 10(-12) W cm(-1) Hz(-1/2). We demonstrate the sensor platform in the 1530 nm wavelength range with a simple distributed feedback diode laser, achieving 75 ppt sensitivity for C2H2 with a 10 s integration time.
Subject: 116 Chemical sciences
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