Apparatus for determining the reflectivity of the surface of a measured object
US4311393A · kind A · utility
Inventor
Key dates
| Filing date | Mar 5, 1980 |
| Grant date | Jan 19, 1982 |
| Priority date | — |
| Expiry date | Mar 5, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/314
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Apparatus for determining the reflectivity of the surface of a measured object, and, in particular, for determining properties of the measured object which are connected with its reflectivity. A light source emits light along a light path so that a wide-band light beam impinges on the surface of the measured object. The light reflected by the surface of the measured object goes through a pair of narrowband light filters which pass, respectively, light beams of different narrow bands of wave-lengths effective for evaluation by a photo-detection device. The photo-detection device comprises two separate photo-detectors each covered by one of the narrow-band filters. The filters are fixed in their positions relative to the photo-detectors and transmit their different wave-lengths of light to their respective photo-detectors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.