Patent ID: 9182223
Filing Date: 2015-11-10
Classification: G01B,G01D

Abstract:
1. A device for measuring a rotating angle of two objects rotating in relation to each other around an axis, with a light source; with a polarizer such that the light source and the polarizer rotate in relation to each other as function of the rotating angle; and with a receiver which measures the luminous intensity reflected by the polarizer, in order to produce a signal dependent on the rotating angle; where the receiver has at least one initial reception element; and where the light emitted by the light source is polarized, and/or a polarizing filter with an initial direction of polarization is positioned in front of a first reception element, or the light emitted by the light source becomes polarized, and/or the polarizing filter with the initial direction of polarization is positioned in front of the first reception element; and where at least one element that casts a shadow is positioned in front of the receiver; and the receiver has at least one quadrant diode, wherein the position and/or shape of the shadow on the receiver varies as the polarizer rotates 360°, wherein the polarizer takes the form of a disk with a normal, such that the normal of the disk is positioned at angle to the rotating axis that differs from 0°.