System and method for measuring distance

Details System and method for measuring distance System and method for measuring distance

1973-10-29

1976-02-10

Tubbesing, T. H.

Optics: measuring and testing

Range or remote distance finding

With photodetection

343 12R, G01C 308

Patent

active

039375749

ABSTRACT:
A pair of light intensity detectors are spaced apart in range and an arrangement is included for reflecting light from a target to the detectors. The system measures target range by dividing the output signal of one of the detectors by a signal which is a function of the difference between the output signals of the two detectors to produce a quotient signal. To avoid low signal instability problems, the difference signal is generated in one embodiment of the system by subtracting only a selected fraction of the output signal of the far detector from that of the near detector. A substantially linearized output signal representing target range is produced in this system embodiment by raising the quotient signal to a selected power. The light detectors are preferably incorporated in input circuits which are temperature compensated.

REFERENCES:
patent: 2206036 (1940-07-01), Herson
patent: 3454772 (1969-07-01), Vitt, Jr. et al.
patent: 3562785 (1971-02-01), Craig
patent: 3719421 (1973-03-01), Poilleux et al.
patent: 3720468 (1973-03-01), Skagerlund
patent: 3788741 (1974-01-01), Buechler
patent: 3815994 (1974-06-01), Peckham

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