1 August 1968 Recent Underwater Range-Gated Measurements
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Proceedings Volume 0012, Underwater Photo-Optical Instrumentation Applications II; (1968); doi: 10.1117/12.946728
Event: Underwater Photo-Optical Instrumentation Applications, 1968, San Diego, United States
Abstract
Ranges obtainable in underwater viewing are severely limited by backscattering. Increased ranges are possible by means of the range-gating technique, which gates out most of the unwanted backscattering electronically. Tests were conducted in filtered fresh water to determine the performance of a range-gating system and the characteristics of water in terms of image quality or resolution. A pulsed blue-green laser source and a highly sensitive receiver were used. Results indicate that range-gated systems are effective for underwater viewing up to 131 feet with good resolution. Comparison tests in a laser-illuminated ungated mode, a back-illuminated mode, and a front-illuminated mode were conducted concurrently.
© (1968) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
T. Keil, A. Immarco, M. Kerpchar, "Recent Underwater Range-Gated Measurements", Proc. SPIE 0012, Underwater Photo-Optical Instrumentation Applications II, (1 August 1968); doi: 10.1117/12.946728; https://doi.org/10.1117/12.946728
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KEYWORDS
Receivers

Photography

Modulation transfer functions

Scattering

Diffusers

Image intensifiers

Backscatter

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