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.
Original language | English |
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Journal | Analyst |
Volume | 144 |
Issue number | 7 |
Pages (from-to) | 2291-2296 |
Number of pages | 6 |
ISSN | 0003-2654 |
DOIs | |
Publication status | Published - 7 Apr 2019 |
MoE publication type | A1 Journal article-refereed |
Fields of Science
- 116 Chemical sciences