NASA NTRS · 19800000328
Tracking falling objects
Abstract
Moving lens follows movement of object accelerated by gravity. Lenses and mirrors maintain constant magnification regardless of distance between moving optical carriage mechanism and fixed telescope. Device tracks objects up to 2 cm in diameter over vertical distance of 2 m.
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Frazer, R. E.. 1981-01-01. Tracking falling objects. https://ntrs.nasa.gov/citations/19800000328
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