Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1986-01-22
1988-02-09
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250214B, 250221, 356 4, G01J 120
Patent
active
047243120
ABSTRACT:
A proximity detecting and warning system for use in collision avoidance, particularly with aircraft. The system responds to pulsed light sources within a selected frequency band and particularly the frequency of aircraft strobe and rotating beacon light sources while disregarding any other natural steady state light sources as well as man-made light sources such as street lighting and ground lighting sources. The system detects pulsed light sources on aircraft or vehicles within the proximity of the transmitter and provides a visual and audible alarm to a pilot or operator. The alarm occurs when another aircraft is within the detection envelope which typically extends in an elliptical pattern around the transmitter in all directions with a detection range of up to approximately three miles. The circuit is designed to detect the strobe or rotating beacons having frequencies standardized by Federal Regulations which also require that these sources be illuminated at all times during flight. The proximity sensing system has a light pulse detector, a circuit for limiting the response of the device to the particular frequencies selected, and processing circuits which process received signals to discriminate between the selected frequencies and activates the visual and audible alarms.
REFERENCES:
patent: 3781842 (1973-12-01), Campman
patent: 3803572 (1974-04-01), Campman
patent: 3987297 (1976-10-01), Brienza et al.
patent: 4159419 (1979-06-01), Wittke
patent: 4179691 (1979-12-01), Keller
patent: 4276472 (1981-06-01), Costantino et al.
patent: 4315690 (1982-02-01), Trocellier et al.
Mon Donald D.
Nelms David C.
Oen William L.
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