Blackening sensor
US4252443A · kind A · utility
8Cited by
3References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 9, 1979 |
| Grant date | Feb 24, 1981 |
| Priority date | — |
| Expiry date | Aug 9, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/346
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A blackening sensor analyses a signal generated by the detection of scattered light reflected from a succession of small illuminated areas on the surface of a web to determine the degree of skewness of the amplitude distribution of the generated signal from a normal distribution, thereby to provide an indication of the degree of blackening.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.