Process and apparatus for measuring small quantities of light
US5307145A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 13, 1992 |
| Grant date | Apr 26, 1994 |
| Priority date | — |
| Expiry date | Aug 13, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J2001/444
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A light receiver converts light to be measured into an electrical signal, which during a measuring interval is integrated into a measuring signal. In a first time segment a first mean value signal is formed, corresponding to the mean value of the measuring signal over the first time segment. In a second time segment of equal duration, a second mean value signal is formed within the same measuring interval, corresponding to the mean value of the measuring signal over the second time segment. Finally a difference signal is formed corresponding to the difference of the two mean value signals and constituting a measure of the light received. The difference signal is passed on for further signal processing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.