Dynamic photoacoustic spectroscopy for trace gas detection
Year: 2012
Type: article
Abstract: We present a method of photoacoustic spectroscopy in which a laser beam tuned to an absorption feature of a gas is swept through its plume at the speed of sound. The resulting coherent addition of acoustic waves leads to an amplification of the signal without the need for a resonant chamber, thus enhancing the ability to remotely sense the gas. We demonstrate the concept using a tunable CO2 laser and SF6 gas in conjunction with a microphone. Sound pressure levels of 83 dB (relative to 20 μPa) are generated from a 15-ppm plume.
Source: Applied Physics Letters
DOI: 10.1063/1.4764515
Authors: C. M. Wynn, S. Palmacci, M. L. Clark, R. R. Kunz
Institutions: MIT Lincoln Laboratory, Massachusetts Institute of Technology
Language: English
Subfield: Spectroscopy
Field: Chemistry
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W2018924259