Chopper-stabilized absolute distance meter
US6847436B2 · kind B2 · utility
88Cited by
11References
31Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 10, 2002 |
| Grant date | Jan 25, 2005 |
| Priority date | — |
| Expiry date | Apr 10, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S17/36
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An absolute distance measurement device is provided, including reference and measurement laser signal paths, comprising a laser source providing a laser signal and a chopper assembly, comprising a rotatable surface defining at least one aperture provided through a portion of the rotatable surface; wherein the laser signal is directed to different points on the rotatable surface of the chopper assembly such that as the rotatable surface is rotated, the aperture selectively permits transmission and selectively prevents transmission of each of said at least two laser signal paths.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.