Pulsed laser optoacoustic detection of flame species

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

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