Optical angle sensor using polarization techniques

Details Optical angle sensor using polarization techniques Optical angle sensor using polarization techniques

1993-04-29

1995-06-13

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023113, G02F 101

Patent

active

054245354

ABSTRACT:
A three-phase angular position sensor is described in which three beams of light having polarization directions rotated 60.degree. to each other are passed through a polarizer, the rotational position of the polarizer representing an angle to be measured. The intensities of the beams transmitted through the polarizer uniquely encode its angle over a 180.degree. range. This range may be doubled, for example, by including a binary track. A two-phase angular position sensor is also described in which two beams have polarization directions oriented 45.degree. with respect to one another.

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