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Proceedings Paper

Modulated laser line scanner for enhanced underwater imaging
Author(s): Linda J. Mullen; V. Michael Contarino; Alan Laux; Brian M. Concannon; Jon P. Davis; Michael P. Strand; Bryan W. Coles
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Paper Abstract

Current Laser Line Scanner (LLS) sensor performance is limited in turbid water and in bright solar background conditions. In turbid water, backscattered and small angle forward scattered light reaching the receiver decreases underwater target contrast and resolution. Scattered solar energy reaching the detector also decreases detection sensitivity by increasing receiver noise. Thus, a technique which rejects unwanted, scattered light while retaining image-bearing photons is needed to improve underwater object detection and identification. The approach which we are investigating is the application of radar modulation and detection techniques to the LLS. This configuration will enable us to use optical modulation to discriminate against scattered light. A nonscanning mock-up of an existing LLS, the Electro-Optic Identification sensor, has been developed with off-the-shelf components. An electro-optic modulator will be added to this system to create a modulated LLS prototype. Laboratory tank experiments will be conducted to evaluate the performance of the modulated LLS as a function of water clarity and solar background levels. The new system will be compared to its unmodulated counterpart in terms of target contrast.

Paper Details

Date Published: 28 October 1999
PDF: 8 pages
Proc. SPIE 3761, Airborne and In-Water Underwater Imaging, (28 October 1999); doi: 10.1117/12.366470
Show Author Affiliations
Linda J. Mullen, Naval Air Warfare Ctr. (United States)
V. Michael Contarino, Naval Air Warfare Ctr. (United States)
Alan Laux, Naval Air Warfare Ctr. (United States)
Brian M. Concannon, Naval Air Warfare Ctr. (United States)
Jon P. Davis, Naval Air Warfare Ctr. (United States)
Michael P. Strand, Naval Surface Warfare Ctr. (United States)
Bryan W. Coles, Raytheon Systems Co. (United States)

Published in SPIE Proceedings Vol. 3761:
Airborne and In-Water Underwater Imaging
Gary D. Gilbert, Editor(s)

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