Method and device for optically measuring distance or speed
US7460215B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 6, 2001 |
| Grant date | Dec 2, 2008 |
| Priority date | — |
| Expiry date | Jul 6, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C15/002
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention relates to a method for measuring a distance-related variable such as distance, speed or acceleration, or for levelling. An emitting device (1-6) comprising at least one microlaser (3) is used as an emitter, and the beam reflected off an object surface is received and evaluated for measurement. A beam is emitted and evaluated after being received, in a substantially simultaneous manner in at least two different wavelengths. Preferably, said method is carried out by means of a device whereby the microlaser (3) in the form of a passively pulsating microlaser (3) emits at least two different wavelengths. A receiver (15, 40) for the laser beam reflected off an object is arranged downstream from the evaluating device (41).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.