Application Of A Laser Scanning And Imagine System To Underwater Viewing

Albert W. Angelbeck

doi:10.1117/12.971006

1 June 1966 Application Of A Laser Scanning And Imagine System To Underwater Viewing

Albert W. Angelbeck

Proceedings Volume 0007, Underwater Photo Optics I; (1966) https://doi.org/10.1117/12.971006
Event: Underwater Photo-Optical Instrumentation Applications, 1966, Santa Barbara, United States

Abstract

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.

Citation Download Citation

Albert W. Angelbeck "Application Of A Laser Scanning And Imagine System To Underwater Viewing", Proc. SPIE 0007, Underwater Photo Optics I, (1 June 1966); https://doi.org/10.1117/12.971006

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