NASA NTRS · 19660000406
Direction indicator system does not require complicated optics
Abstract
Direction indicator which aligns a system relative to a light source uses two photocells as light sensors to form a set. Each set indicates one direction. This indicator has no moving parts and provides very fine vernier acquisition.
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Mildice, J. W.. 1966-09-01. Direction indicator system does not require complicated optics. https://ntrs.nasa.gov/citations/19660000406
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