Method using concentrator for measuring luminous flux of LED
US7973917B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 13, 2008 |
| Grant date | Jul 5, 2011 |
| Priority date | — |
| Expiry date | Apr 15, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J2001/4252
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention relates to the technical field of measuring light source, specifically, to the method for measuring the luminous flux of LED. In the present invention, a reflecting cup is used as a collector of the luminous flux of LED. The collector has two sectional openings in the direction perpendicular to the symmetric axis thereof, which are positioned in the front and in the rear respectively, one of them positioned at the bottom end of the collector and having a smaller radius is used to input the light emitted by LED to be measured, the other positioned in the front end of the collector and having a larger radius is used to output the light to the detector placed in this position. Specifically, LED is fixed at the bottom end of the collector with a fixture, the light emitted by LED is directed toward the large opening of the collector, and the photometer is fixed closely at the large opening of the collector to receive light signals. LED is driven with a constant current power supply, and the total luminous flux emitted by LED is concentrated by the collector, collected and measured by the detector, then corrected by using a calibrating coefficient, in order to achie…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.