Scanning-type distance measurement device responsive to selected

Details Scanning-type distance measurement device responsive to selected Scanning-type distance measurement device responsive to selected

1995-07-31

1998-06-02

Buczinski, Stephen C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

180169, 3561411, G01C 308, B60T 716, G01B 1126

Patent

active

057608865

ABSTRACT:
A scanning-type distance measurement device is responsive to selected signals to reduce interference due to stray light. An emitted beam of light is aimed to be reflected from an object and to a photodetector among a plurality of photodetectors which are positioned linearly or in two-dimensions. The outputs of the photodetectors are selected based on the position of the emitted beam of light, so that photodetectors which should not contribute to the reflected beam, based on the geometry of the emitted beam and the reflecting object, are ignored. This approach reduces the effects of stray noise from other light sources. The selection of the photodetectors is synchronized with a scanning light emitter generating the beam of light by a position signal and an angular signal so that the noise component in the output signal which is due to stray light can be kept to a minimum.

REFERENCES:
patent: 4355895 (1982-10-01), Cairns et al.
patent: 4764982 (1988-08-01), Pfund

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