Cavity-enhanced cantilever-enhanced photo-acoustic spectroscopy
Tomberg, Teemu; Hieta, Tuomas; Vainio, Markku; Halonen, Lauri (2019-02-28)
Tomberg, Teemu
Hieta, Tuomas
Vainio, Markku
Halonen, Lauri
28.02.2019
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tuni-202003032475
https://urn.fi/URN:NBN:fi:tuni-202003032475
Kuvaus
Peer reviewed
Tiivistelmä
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.
Kokoelmat
- TUNICRIS-julkaisut [17001]