Optical distance measurement apparatus provided with smear detec

Details Optical distance measurement apparatus provided with smear detec Optical distance measurement apparatus provided with smear detec

1994-04-01

1996-02-06

Buczinski, Stephen C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356 401, 356 51, G01C 300, G01C 500

Patent

active

054891493

ABSTRACT:
An optical distance measurement apparatus for measuring the distance to an object 7 on the basis of the round-trip time of the light to and from the object. 7 includes an object detector means 32 and a smear detector means 33. The smear detector means 33 detects a smear when the ratio of unsuccessful measurements (i.e., the measurements by which no object is detected) is greater than or equal to a predetermined level. Alternatively, the number of successive measurements of a distance less than a predetermined threshold level (e.g., 50 meters) is stored in a counter, and the smear is detected when the content of the counter becomes greater than or equal to a predetermined number.

REFERENCES:
patent: 4511249 (1985-04-01), Frungel et al.
patent: 5337137 (1994-08-01), Ogawa et al.
Derwent Abstract, DE 3,619,209.

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