Abstract
In recent years an increasing use has been made of laser based techniques for non-intrusive temperature measurements and analysis of combustion and other hostile environments. Degenerate four-wave mixing (DFWM) is a single photon resonant process producing a collimated signal which enables spatial discrimination of background and scattered light. Scanning DFWM has been used for detection of several radical species including OH [1] and C2[2] and for thermometry [3]. Of particular use for diagnostics, however, are single-shot temperature measurements, especially for studying rapidly varying environments. The feasibility of single-shot multiplex DFWM thermometry of the hydroxyl radical has been demonstrated[4,5].
© 1996 Optical Society of America
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