Light reflectance instrument
US4029420A · kind A · utility
Inventor
Key dates
| Filing date | Dec 27, 1974 |
| Grant date | Jun 14, 1977 |
| Priority date | — |
| Expiry date | Dec 27, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/4738
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An instrument for measuring light reflectance from fabric and the like materials which have a heterogeneous surface configuration includes an aperture defining a sensing area, three light sources for illuminating the sensing area, and a photoelectric cell for detecting light reflected from the material in the sensing area. The light sources are mounted at 120.degree. with respect to one another around an outer periphery of the cell. The cell is mounted coaxially with respect to and a spaced distance from the aperture. Each light source is mounted on a line which passes through the center of the aperture and is at an angle of 30.degree. with respect to an axis of the aperture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.