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Evaluation of an electro-optic remote displacement measuring systemAn instrumentation system to provide a noncontact method for measurement of target positions was evaluated. The system employs two electro-optic camera units which give stereo information for use in determining three dimensional target locations. Specially developed, infrared sensitive photodetectors are used in the cameras to sense radiation from light emitting diode targets. Up to 30 of these targets can be monitored with a sampling rate of 312 Hz per target. An important part of the system is a minicomputer which is used to collect the camera data, sort it, make corrections for distortions in the electro-optic system, and perform the necesssary coordinate transformations. If target motions are restricted to locations in a plane which is perpendicular to a camera's optical axis, the system can be used with just one camera. Calibrations performed in this mode characterize accuracies in single camera operation. This information is also useful in determination of single camera contributions to total system errors. For this reason the system was tested in both the single camera and two camera (stereo) modes of operation.
Document ID
19820023786
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Monteith, J. H. (NASA Langley Research Center Hampton, VA, United States)
Kroen, M. L. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 4, 2013
Publication Date
July 1, 1982
Subject Category
Instrumentation And Photography
Report/Patent Number
NAS 1.15:84530
NASA-TM-84530
Accession Number
82N31662
Funding Number(s)
PROJECT: RTOP 505-31-63-03
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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