Optoelectronic distance measuring device
US7760337B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 28, 2008 |
| Grant date | Jul 20, 2010 |
| Priority date | — |
| Expiry date | Feb 13, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S7/491
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An optoelectronic distance measuring device includes a frequency modulator generating a high-frequency modulation signal, an emitter emitting a high-frequency modulated measuring beam to an object to be measured, an avalanche photodiode receiving a reflected measuring beam from the object and generating a corresponding high-frequency reflected measuring signal, and a signal generating device generating a high-frequency mixer signal connected with the avalanche photodiode. The high-frequency mixer signal is applied to the avalanche photodiode and mixed with the high-frequency reflected measuring signal to provide a low-frequency measuring signal which contains phase information for calculating a distance to be measured. In this manner, measuring error due to phase drift is eliminated without the need for an extra internal reference optical path and an mechanical switching device so that the structure of the device is simplified significantly and manufacturing costs are reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.