Abstract

This paper reports nearly shot noise limited detection of OH using the technique of laser-induced fluorescence. A lidar configuration is used to excite fluorescence in a large volume, and a narrow-bandwidth interference filter provides spectral discrimination. This arrangement alleviates the effect of ozone interference and facilitates image processing at relatively close distances. The detection limit is determined mainly by the shot noise of the solar background. Ground-based measurements in Dearborn indicate a detection limit of ~2 × 106 OH/cm3 over a 40-min acquisition period. In favorable conditions, a comparable detection limit is also expected for airborne measurements.

© 1984 Optical Society of America

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