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Optoacoustic pulses in a flame

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Abstract

Pulsed pressure waves are produced by energy transfer from electronically excited Na or Li atoms seeded in an acetylene–air flame; the excitation is provided by a resonantly tuned, pulsed laser. Temperature increases of ~1° within the flame produce signals easily detected by a microphone. A description of the phenomenon is given, and preliminary results are presented for two possible applications: localized speed-of-sound measurements and quenching rate determinations.

© 1977 Optical Society of America

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