NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Characteristics of a dynamic holographic sensor for shape control of a large reflectorDesign 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.
Document ID
19930037965
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Welch, Sharon S.
(NASA Langley Research Center Hampton, VA, United States)
Cox, David E.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1991
Publication Information
Publication: In: Sensors and sensor integration; Proceedings of the Meeting, Orlando, FL, Apr. 4, 1991 (A93-21961 07-35)
Publisher: Society of Photo-Optical Instrumentation Engineers
Subject Category
Instrumentation And Photography
Accession Number
93A21962
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available