Electrooptical distance measuring device

Details Electrooptical distance measuring device Electrooptical distance measuring device

G - Physics

01

S

343/5, 345/55

G01S 7/48 (2006.01) G01S 7/481 (2006.01) G01S 7/499 (2006.01) G01S 17/32 (2006.01) G01S 17/36 (2006.01)

Patent

CA 1245748

ABSTRACT OF THE DISCLOSURE: For electrooptical measurement of distance with modulation of light external to the light source a modulator system with low sensitivity to temperature and with a low modulating voltage is disclosed. The temperature dependence of the static birefringence of a modulating crystal is compensated by passing the modulated light beam, after traversing the crystal, a quarterwaveplate, the measured path and the quarterwave plate again - a second time through the crystal with its polarization rotated by 90°. The light beam returning from the measured path is separated from its source by means of a polarizing beam splitter.

510522

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