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Optical Engineering

Underwater Pinpoint Photography
Author(s): Harold E. Edgerton
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Paper Abstract

Lowering a camera to a position just above the sea floor is a critical operation. The "pinger" method of camera-to-bottom positioning has proved to be an excellent technique. A sonar transducer on the camera sends one sound signal directly to the surface, and another to the bottom. The bottom signal, reflected from the sea floor, rises to the surface where its delayed arrival time is measured against the camera signal beamed to the surface. An Alden recorder is used to record each direct or reflected signal as received.

Paper Details

Date Published: 1 November 1963
PDF: 3 pages
Opt. Eng. 2(1) 020103 doi: 10.1117/12.7971261
Published in: Optical Engineering Volume 2, Issue 1
Show Author Affiliations
Harold E. Edgerton, Massachusetts Institute of Technology (United States)

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