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Issue 7, 2019
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Cavity-enhanced cantilever-enhanced photo-acoustic spectroscopy

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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 ∼100, resulting in an exceptionally good normalised noise equivalent absorption (NNEA) value of 1.75 × 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.

Graphical abstract: Cavity-enhanced cantilever-enhanced photo-acoustic spectroscopy

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Publication details

The article was received on 09 Jan 2019, accepted on 14 Feb 2019 and first published on 28 Feb 2019


Article type: Paper
DOI: 10.1039/C9AN00058E
Citation: Analyst, 2019,144, 2291-2296
  • Open access: Creative Commons BY-NC license
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    Cavity-enhanced cantilever-enhanced photo-acoustic spectroscopy

    T. Tomberg, T. Hieta, M. Vainio and L. Halonen, Analyst, 2019, 144, 2291
    DOI: 10.1039/C9AN00058E

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