NASA NTRS · 19660000169
Scanning photometer system automatically determines atmospheric layer height
Abstract
Two photometers, placed a given distance apart, determine the height of nonuniform luminous layers in a synchronous manner. Photometer outputs are correlated by a simple analog correlation computer to automatically give the luminous layer height. This system is used to determine visibility ceilings at airports.
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Wolff, M.. 1966-04-01. Scanning photometer system automatically determines atmospheric layer height. https://ntrs.nasa.gov/citations/19660000169
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