期刊
ANALYST
卷 144, 期 7, 页码 2291-2296出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9an00058e
关键词
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资金
- CHEMS doctoral program of the University of Helsinki
- Academy of Finland [294752, 314363]
- Jenny and Antti Wihuri Foundation
- Academy of Finland (AKA) [294752, 314363, 294752, 314363] Funding Source: Academy of Finland (AKA)
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.
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