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Proceedings Paper

Coherent Fiber Optic Coupling Techniques For Downhole Imaging Cameras[sup]l[/sup]
Author(s): George R Cameron
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Paper Abstract

Cameras used to monitor underground nuclear testing experiments are subjected to a variety of harsh conditions which must be accounted for during the design phase. Since experiments are buried several thousand feet below ground, reliability is of foremost concern. Many of the cameras designed at Lawrence Livermore Laboratory contain coherent fiber optic components such as microchannel plate image intensifiers, fiber optic reducers, and diode or CCD imaging arrays. Coupling of these components calls for hardware which will maintain precise contact and alignment in conditions of high vibration, large thermal transition, and high humidity. In addition, the hardware must be easily assembled by untrained technical personnel under less than ideal conditions (windy, dusty, rainy, etc.). A high speed imaging camera based upon a Fairchild CCD array chip was designed at Livermore in 1984. Problems in coupling the array window to a fiber optic reducer were aggravated by mounting of the array chip rigidly to the main video circuit board. A new array chip daughter board, attached by flat ribbon cable and supported by a spring loaded lever combination was designed to overcome the problem. The hardware did not increase the overall size of the existing camera and increased the unit cost by less than 1 K$. The design of this hardware will be discussed along with useful techniques for designers of cameras used in harsh environments.

Paper Details

Date Published: 6 October 1987
PDF: 5 pages
Proc. SPIE 0787, Optical Techniques for Sensing and Measurement in Hostile Environments, (6 October 1987); doi: 10.1117/12.940696
Show Author Affiliations
George R Cameron, Lawrence Livermore National Laboratory (United States)

Published in SPIE Proceedings Vol. 0787:
Optical Techniques for Sensing and Measurement in Hostile Environments
Calvin H. Gillespie; Roger A. Greenwell, Editor(s)

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