Electrooptical distance measuring apparatus

Details Electrooptical distance measuring apparatus Electrooptical distance measuring apparatus

1986-06-10

1988-07-26

Buczinski, Stephen C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

332 751, G01C 308, H01S 300

Patent

active

047596236

ABSTRACT:
For electrooptical measurement of distance with modulation of light external to the light source (1) a modulator system (5, 7, 8, 11) with low sensitivity to temperature and with a low modulating voltage is disclosed. The temperature dependence of the static birefringence of a modulating crystal (7) is compensated by passing the modulated light beam (6), after traversing the crystal (7), a quarterwave plate (11), the measured path (9) and the quarterwave plate (11) again--a second time through the crystal (7) with its polarization rotated by 90.degree.. The light beam returning from the measured path is separated from its source (1) by means of a polarizing beam splitter (5).

REFERENCES:
patent: 3547539 (1970-12-01), Froome et al.
patent: 4380391 (1983-04-01), Buser et al.

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