Optical device and method for measuring the rotation of an object
US8514382B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 24, 2009 |
| Grant date | Aug 20, 2013 |
| Priority date | — |
| Expiry date | May 29, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01H9/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and optical device measures the rotation of an object, including a light source emitting a collimated incident light beam, and a reflecting plane optical interface to be fastened to the object and forming a first reflected beam. The device includes a corner reflector fastened to the object, and having reflecting plane faces forming a second reflected beam, and a detection system capable of measuring the displacement Δ1 of the first reflected beam, and the displacement Δ2 of the second reflected beam. A processing system calculates, as a function of Δ1 and of the distance D1 between the detection system and the reflecting plane optical interface, and of the measurement of Δ2 and of the distance D2 between the detection system and the corner reflector, a measurement of the rotation α of the object between an initial position and a measurement position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.