Method and means for measuring distance of a moving object from a fixed point of reference
US4868401A · kind A · utility
3Cited by
8References
9Claims
0Family size
Inventors
Key dates
| Filing date | Oct 3, 1988 |
| Grant date | Sep 19, 1989 |
| Priority date | — |
| Expiry date | Oct 3, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R3/002
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention utilizes a light source mounted on a moving object and providing a light having a constant intensity. A detector circuit creates an electrical detector signal in response to receiving light from a predetermined fixed point of reference. The detector signal is then linearized by a linearization circuit which transforms the detector signal which is substantially nonlinear to a linearization signal which is substantially linear. The linearization signal can then be used in a feedback circuit for causing movement of the moving object, and can be used to precisely control the movement of the moving object.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.