Electronic distance measuring device using a phase difference de

Details Electronic distance measuring device using a phase difference de Electronic distance measuring device using a phase difference de

1996-02-06

1998-04-07

Hellner, Mark

Optics: measuring and testing

Range or remote distance finding

With photodetection

G01C 308

Patent

active

057370680

ABSTRACT:
An electronic distance measuring device which includes a radiation source for emitting frequency-modulated radiation along one of two paths. The electronic distance measuring device also has a device for switching the emitted radiation from one of the two paths to the other of the two paths, a detector for detecting the radiation emitted along the paths, and a device for determining a difference in phase between the emitted radiation and the detected radiation. The detection of the phase difference is performed twice between two consecutive switchings of the light paths. A distance of the electronic distance measuring device from an objective station is then calculated in accordance with the determined phase difference.

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patent: 5274429 (1993-12-01), Misawa et al.
patent: 5317375 (1994-05-01), Omamyuda et al.

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