Cavity-enhanced cantilever-enhanced photo-acoustic spectroscopy. Issue 7 (28th February 2019)

• Record Type: Journal Article
• Authors: Tomberg, Teemu; Hieta, Tuomas; Vainio, Markku; Halonen, Lauri
• Is Part Of: Analyst. Volume 144:Issue 7(2019)
• Page Start: 2291
• Page End: 2296
• Publication Date: 2019-02-28
• Subjects: Chemistry, Analytic -- Periodicals; 543
• DOI: 10.1039/c9an00058e
• Languages: English
• ISSNs: 0003-2654

Abstract

Abstract : Highly sensitive and selective trace gas detection based on a novel photo-acoustic laser spectroscopy method. 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 C2 H2 with a 10 s integration time.