Apparatus for and method of measuring a distribution of luminous intensity of light source
US5914777A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 20, 1998 |
| Grant date | Jun 22, 1999 |
| Priority date | — |
| Expiry date | Jan 20, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J1/4257
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An ellipsoidal mirror having an axis of rotational symmetry is disposed so that a first focal point thereof is positioned in vicinity of a measurement area of a light source to be measured. The ellipsoidal mirror reflects parallel light beams from the measurement area onto an optical focal plane on which the reflected light beams are focused, whereby a luminous intensity distribution image of the measurement area is formed on the optical focal plane. The luminous intensity distribution image is directed via a relay lens system onto a sensing surface of an image pickup unit. A distribution of luminous intensity of the measurement area is obtained based on the luminous intensity distribution image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.