Optoelectronic system for passive range metering

Details Optoelectronic system for passive range metering Optoelectronic system for passive range metering

1986-04-21

1988-02-23

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356 28, G01P 336

Patent

active

047272589

ABSTRACT:
For passive range metering of moving vehicles a receiver is used having two detectors spaced apart and directed to the path of the vehicle which moves with constant speed and the length of which is known. The receiver measures the pass-through time of the image of the vehicle through the first detector and furthermore measures the traveling time of the image of the vehicle from one detector to the other. The distance E can be calculated by equation ##EQU1## wherein f is the focal distance of the receiver optics, Q.sub.t is the quotient of the measured time values, l is the length of the vehicle.

REFERENCES:
patent: 3804518 (1974-04-01), Meyr
patent: 4135817 (1979-01-01), Young et al.
patent: 4167330 (1979-09-01), Haville

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