Electronic distance measuring device

Details Electronic distance measuring device Electronic distance measuring device

1996-04-17

1999-03-23

Biegel, Ronald L.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356 51, G01C 308

Patent

active

058867775

ABSTRACT:
An electronic distance measuring device that measures a distance from the electronic distance measuring device to an objective station. The electronic distance measuring device includes a radiation source for emitting frequency-modulated radiation towards a reflector disposed at the objective station, and a detector for detecting radiation reflected by the reflector. The distance of the objective station from the electronic distance measuring device is then calculated in accordance with the detected radiation. At least one radiation attenuating filter is positioned in a radiation path between the radiation source and the detector. The radiation attenuating filter is inclined with respect to a main axis of the radiation path so as to prevent incidence on the detector of an irregular reflection of the radiation by the attenuating filter.

REFERENCES:
patent: 4560270 (1985-12-01), Wiklund et al.
patent: 4636068 (1987-01-01), Niiho et al.
patent: 5313261 (1994-05-01), Leatham et al.
patent: 5430537 (1995-07-01), Liessner et al.

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