Share Email Print

Optical Engineering

Underwater modulated pulse laser imaging system
Format Member Price Non-Member Price
PDF $20.00 $25.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

The detection and identification of underwater threats in coastal areas are of interest to the Navy. When identifying a potential target, both two-dimensional (amplitude versus position) and three-dimensional (amplitude and range versus position) information are important. Laser imaging in turbid coastal waters makes this task challenging due to absorption and scattering in both the forward and backward directions. Conventional imaging approaches to suppress scatter rely on a pulsed laser and a range-gated receiver or an intensity-modulated continuous wave laser and a coherent RF receiver. The modulated pulsed laser imaging system is a hybrid of these two approaches and uses RF intensity modulation on a short optical pulse. The result is an imaging system capable of simultaneously acquiring high-contrast images along with high-precision unambiguous ranges. A working modulated pulsed laser line scanner was constructed and tested with a custom-built transmitter, a large-bandwidth optical receiver, and a high-speed digitizing oscilloscope. The effectiveness of the modulation to suppress both backscatter and forward scatter, as applied to both magnitude and range images, is discussed.

Paper Details

Date Published: 3 January 2014
PDF: 9 pages
Opt. Eng. 53(5) 051403 doi: 10.1117/1.OE.53.5.051403
Published in: Optical Engineering Volume 53, Issue 5
Show Author Affiliations
Shawn P. O'Connor, Naval Air Warfare Ctr. Aircraft Div. (United States)
Linda J. Mullen, Naval Air Systems Command (United States)
Brandon Cochenour, Naval Air Warfare Ctr. Aircraft Div. (United States)

© SPIE. Terms of Use
Back to Top