NASA NTRS · 19730000131
Light-direction sensor based on birefringency
Abstract
Optical system consisting of polarizer, analyzer, quarterwave retarder converts incident light beam to one which has an intensity related to the extent the incident beam is off axis.
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Johnston, A. R.. 1973-03-01. Light-direction sensor based on birefringency. https://ntrs.nasa.gov/citations/19730000131
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