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Proceedings Paper

Characteristics of a dynamic holographic sensor for shape control of a large reflector
Author(s): Sharon S. Welch; David E. Cox
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Paper Abstract

Design of a distributed holographic interferometric sensor for measuring the surface displacement of a large segmented reflector is proposed. The reflector's surface is illuminated by laser light of two wavelengths and volume holographic gratings are formed in photorefractive crystals of the wavefront returned from the surface. The sensor is based on holographic contouring with a multiple frequency source. It is shown that the most stringent requirement of temporal stability affects both the temporal resolution and the dynamic range. Principal factor which limit the sensor performance include the response time of photorefractive crystal, laser power required to write a hologram, and the size of photorefractive crystal.

Paper Details

Date Published: 1 July 1991
PDF: 9 pages
Proc. SPIE 1480, Sensors and Sensor Integration, (1 July 1991); doi: 10.1117/12.46488
Show Author Affiliations
Sharon S. Welch, NASA/Langley Research Ctr. (United States)
David E. Cox, NASA/Langley Research Ctr. (United States)


Published in SPIE Proceedings Vol. 1480:
Sensors and Sensor Integration
Peter D. Dean, Editor(s)

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