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ROTATION DETECTION APPARATUS | ROTATIONSERFASSUNGSVORRICHTUNG | APPAREIL DE DÉTECTION DE ROTATION

Patentnummer:EP3296702B1
IPC Hauptklasse:G01D000534
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Erfinder:
Anmeldung:31.07.14
Offenlegung:01.08.13
Patenterteilung:05.02.20

Abstract / Hauptanspruch
A rotation detection apparatus (2), comprising: a beam source (6) for emitting a beam of polarised light; a detector (46A, 46B) for outputting a signal in dependence on the intensity of light which is incident thereupon, the detector (46A, 46B) being arranged so that the beam of polarised light is incident upon it; a polariser (41) for location in the path of the beam of polarised light such that rotation of the polariser (41) relative to the beam of polarised light results in a variation of the intensity of light incident upon the detector (46A, 46B) from the beam source (6) and a corresponding variation in the signal output from the detector (46A, 46B); and a processor (48A, 48B, 48C) for detecting the relative rotation based on the variation of the signal output from the detector (46A, 46B); wherein the beam of polarised light comprises first and second beam portions having first and second different respective polarisation states. The apparatus (2) comprises an arrangement (41) for providing, for each of the first and second beam portions, first and second different relative orientations between a polarisation axis of the polariser (41) and a polarisation direction of the polarised light of that beam portion, thereby correspondingly providing first to fourth different output signals (A1, A2, B1, B2) from the detector (46A, 46B) relating respectively to: (a) the first relative orientation for the first beam portion; (b) the first relative orientation for the second beam portion; (c) the second relative orientation for the first beam portion; and (d) the second relative orientation for the second beam portion; and wherein the processor (48A, 48B, 48C) is operable to detect the relative rotation based on the first to fourth output signals (A1, A2, B1, B2) from the detector (46A, 46B).

EP3296702B1


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