Method for distance measurement and a distance measuring device
US6509958B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 30, 2001 |
| Grant date | Jan 21, 2003 |
| Priority date | — |
| Expiry date | May 30, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S7/4865
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method is described for detecting the distance between a measuring device comprising a transmitter and a receiver and an object, in which a modulated light signal is emitted by the transmitter in the direction of the object, the light signal reflected at the object is received by the receiver and is converted into a reflection signal, and the distance between the measuring device and the object is determined from the light transit time of the light signal received. In addition to the light signal reflected at the object, at least a part of the light signal emitted is received as a reference light signal by a receiver without reflection at the object and is converted into a reference signal. Subsequently the phase shift between the reflection signal and the reference signal is determined for the determination of the light transit time. Moreover, a distance measuring device working in accordance with the method of the invention is described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.