Prof. Qingming Zhao Profile

Prof. Qingming Zhao

at Harbin Normal Univ

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Proceedings Article | 31 August 2009 Paper

Imaging monitoring techniques applications in the transient gratings detection

Qing-ming Zhao

Proceedings Volume 7382, 73824V (2009) https://doi.org/10.1117/12.837004

KEYWORDS: Iodine, Image processing, Dye lasers, Signal to noise ratio, Signal detection, Environmental monitoring, Combustion, Signal generators, Imaging systems, Phase matching

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Experimental studies of Degenerate four-wave mixing (DFWM) in iodine vapor at atmospheric pressure and 0℃ and 25℃ are reported. The Laser-induced grating (LIG) studies are carried out by generating the thermal grating using a pulsed, narrow bandwidth, dye laser .A new image processing system for detecting forward DFWM spectroscopy on iodine vapor is reported. This system is composed of CCD camera, imaging processing card and the related software. With the help of the detecting system, phase matching can be easily achieved in the optical arrangement by crossing the two pumps and the probe as diagonals linking opposite corners of a rectangular box ,and providing a way to position the PhotoMultiplier Tube (PMT) . Also it is practical to know the effect of the pointing stability on the optical path by monitoring facula changing with the laser beam pointing and disturbs of the environment. Finally the effects of Photostability of dye laser on the ration of signal to noise in DFWM using forward geometries have been investigated in iodine vapor. This system makes it feasible that the potential application of FG-DFWM is used as a diagnostic tool in combustion research and environment monitoring.

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