Characteristics of a dynamic holographic sensor for shape control of a large reflector

Sharon S. Welch; David E. Cox

doi:10.1117/12.46488

1 July 1991 Characteristics of a dynamic holographic sensor for shape control of a large reflector

Sharon S. Welch, David E. Cox

Proceedings Volume 1480, Sensors and Sensor Integration; (1991) https://doi.org/10.1117/12.46488
Event: Orlando '91, 1991, Orlando, FL, United States

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.

Citation Download Citation

Sharon S. Welch and David E. Cox "Characteristics of a dynamic holographic sensor for shape control of a large reflector", Proc. SPIE 1480, Sensors and Sensor Integration, (1 July 1991); https://doi.org/10.1117/12.46488

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