Inspection apparatus
US4172666A · kind A · utility
18Cited by
3References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 21, 1977 |
| Grant date | Oct 30, 1979 |
| Priority date | — |
| Expiry date | Nov 21, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/89
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
To distinguish between different types of fault detected by laser scanning of a moving web two or more detectors are arranged to collect light reflected in different ranges of angles in direction of web motion. By combining outputs of these in a logical way representing increases or decreases in the sums and differences of the signals they produce, the faults can be classified as absorbing, scattering, or their opposites, or deflecting.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.