Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1988-01-13
1989-09-26
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356 28, G01V 904, G01P 336
Patent
active
048702676
ABSTRACT:
An activation signal is generated when an aircraft passes directly overhead and may be employed to record aircraft noise levels or to trigger a zenith camera for producing a photograph of the aircraft useful in determining aircraft position. When used in connection with a second instrument located at a fixed distance from the first and along the path of the aircraft, aircraft ground speed may be determined. Ambient light, normally passing through an optically defined airspace and thence incident upon light sensors, is partially blocked when an object such as an aircraft is present. A signal proportional to the change in ambient light incident upon the sensors and a function of the size and shape of the aircraft is used to sense the passage of a wing section. Upon detection of the wing section an activation signal is generated.
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Messinger Michael
Nelms David C.
The Boeing Company
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