Cavity-enhanced cantilever-enhanced photo-acoustic spectroscopy

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Sammanfattning

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.

Originalspråkengelska
TidskriftAnalyst
Volym144
Utgåva7
Sidor (från-till)2291-2296
Antal sidor6
ISSN0003-2654
DOI
StatusPublicerad - 7 apr 2019
MoE-publikationstypA1 Tidskriftsartikel-refererad

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