Light absorptivity measuring device
US4281932A · kind A · utility
4Cited by
1References
3Claims
0Family size
Inventor
Key dates
| Filing date | Jun 14, 1979 |
| Grant date | Aug 4, 1981 |
| Priority date | — |
| Expiry date | Jun 14, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J1/24
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A light source is arranged with a light sensing device in such a way that the sensing device receives transmitted light for a translucent medium or reflected light for an opaque medium. The reading of the sensor is stored, then the same source and sensing device are moved over a reference medium whose absorptivity varies unidirectionally. A comparator compares the reading of the sensor with the stored reading and indicates when they are equal. The relative position of the reference and sensor indicates the absorptivity of the medium. One embodiment uses multiple devices and filters to determine composite color.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.