Process and apparatus for making a numerical determination of the color, or of a change in color, of an object
US4616933A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 27, 1984 |
| Grant date | Oct 14, 1986 |
| Priority date | — |
| Expiry date | Mar 27, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/55
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A coaxial optical fiber bundle assembly (Reference No. 6 in the following Specification and Drawing), carrying emitted light from a light source and received light which has been returned by an object illuminated from said light source, is moved towards the object (Reference No.: 7) to cause the intensity of the received light, as detected by a photo transistor in light emitter-receiver unit (Reference No.: 1), to attain a maximum value which is amplified and held as a display on digital voltmeter (Reference No.: 11). Comparison of the held value with the corresponding held maximum value resulting from a similar determination made of either a different object of the same object after a color change therein or thereof can thus be made on a numerical basis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.