Proceedings PaperApplication Of A Laser Scanning And Imagine System To Underwater Viewing
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Characteristics of an active laser scanning and imaging system are considered in terms of an underwater viewing application. In this system, output of a blue-green iaser is scanned over the field of view by 'in acoustic deflection technique. Diffuse reflected light from the target is detected with a photodetector and the signal generated is used to intensity modulate a synchronized scanned CRT display. Either a non-scanning photodetector such as a photomultiplier or a synchronized scanning detector employing an image dissector can be used. A system analysis is presented which considers the effects of back scatter, attenuation, and system parameters on viewing range as a function of laser power. The analysis considers the improved performance to be obtained by the rejection of back scatter using a synchronized detector. Experimental test tank results were obtained with a bread-board system incorporating a nonscanning detector for a variety of conditions of water clarity and range. Auxiliary experiment's were conducted which illustrate the effectiveness of back-scatter rejection techniques on range enhancement.