Arrangement for and method of detecting an object in an area subject to environmental variations
US5508511A · kind A · utility
37Cited by
18References
43Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 24, 1994 |
| Grant date | Apr 16, 1996 |
| Priority date | — |
| Expiry date | May 24, 2014 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE06B2009/6836
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Environmental variations in ambient light and temperature are eliminated in arrangements for and methods of detecting objects in areas exposed to such variations by generating a differential measurement value indicative of the difference between two signals derived from two light sources, both signals being affected in the same way and extent by the environmental variations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.