Dynamic photoacoustic spectroscopy for trace gas detection

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 CO 2 laser and SF 6 gas in conjunction with a microphone. Sound pressure levels of 83 dB (relative to 20 μPa) are generated from a 15-ppm plume. © 2012 American Institute of Physics.