Abstract

An acoustically resonant CO₂ laser photoacoustic (PA) spectrometer for remote or in situ monitoring of air pollutants has been designed. The salient features of this PA system, along with the optimization tests of various operating parameters that affect the PA signal (buffer-gas pressure, type of buffer gas, laser power, gas concentration, and acoustic modes), are described. The system has been applied for the detection of pollutants emitted from the exhaust of a car located at a remote distance. Also, an alarm system based on the PA detection technique has been built for leak detection of toxic gases at industrial complexes. The minimum detectable concentration of C₂H₄ and SO₂ with this system is 50 parts in 10¹² by volume and 50 parts in 10⁹ by volume, respectively.

© 1997 Optical Society of America

High sensitive detection of nitric oxide using laser induced photoacoustic spectroscopy at 213 nm

Mohammed A. Gondal, Ahmed Asaad I. Khalil, and Noura Al-Suliman
Appl. Opt. 51(23) 5724-5734 (2012)

Highly sensitive electronically modulated photoacoustic spectrometer for ozone detection

M. A. Gondal and Z. H. Yamani
Appl. Opt. 46(29) 7083-7090 (2007)

Photoacoustic spectroscopy on trace gases with continuously tunable CO₂ laser

Philippe Repond and Markus W. Sigrist
Appl. Opt. 35(21) 4065-4085 (1996)

Quantitative signal analysis in pulsed resonant photoacoustics

Stefan Schäfer, András Miklós, and Peter Hess
Appl. Opt. 36(15) 3202-3211 (1997)

Effect of colliding partners on the performance of SF₆ and SO₂ trace measurements in photoacoustic spectroscopy

B. Dibaee, P. Parvin, A. Bavali, V. Daneshafrooz, and M. R. Mohebbifar
Appl. Opt. 54(30) 8971-8981 (2015)