Abstract

Pulsed laser excitation of OH(A–X), NH₂ (A–X), and CO₂ (10.6-μm vibrational hot band) has been detected optoacoustically in flames. Detection sensitivities approaching 1 part in 10⁹, 10⁵, and 10⁵, respectively, were obtained for these species. The form and characteristics of the pressure wave were examined, using OH in flames excited by dye laser and SF₆ in a cold flow excited by a CO₂ laser, to optimize the laser beam and microphone geometry and understand the influence of the microphone frequency response. Attempts to detect H₂O using the vibrational overtone bands near 590 nm were successful in the vapor near 310 K but failed in the hot flame gases.

© 1983 Optical Society of America

Simultaneous multiple species detection in a flame using laser-induced fluorescence

Ulf Westblom and Marcus Aldén
Appl. Opt. 28(13) 2592-2599 (1989)

Hydroxyl (OH) distributions and temperature profiles in a premixed propane flame obtained by laser deflection techniques

Sigmund W. Kizirnis, Robert J. Brecha, Biswa N. Ganguly, Larry P. Goss, and Rajendra Gupta
Appl. Opt. 23(21) 3873-3881 (1984)

Simultaneous multiple species detection in a flame using laser-induced fluorescence: Errata

Ulf Westblom and Marcus Aldén
Appl. Opt. 29(33) 4844-4851 (1990)

Time resolved laser induced fluorescence of the NH radical in low pressure N₂O flames

Richard A. Copeland, Michael L. Wise, Karen J. Rensberger, and David R. Crosley
Appl. Opt. 28(15) 3199-3205 (1989)

Photoacoustic detection of OH molecules in a methane–air flame

A. Rose, J. D. Pyrum, G. J. Salamo, and R. Gupta
Appl. Opt. 23(10) 1573-1579 (1984)