Optoacoustic pulses in a flame.
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 approximately 1 degree 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.
Allen
J E
JE
Ballistic Research Laboratory, Aberdeen Proving Ground, Maryland 21005, USA.
Anderson
W R
WR
Crosley
D R
DR