Equipment and method for LED's total luminous flux measurement with a narrow beam standard light source

US7532324B2 · kind B2 · utility

Assignee

• FUDAN UNIVERSITY · CN

Inventors

• Muqing Liu · Minneapolis, US
• Xiaoli Zhou · Shanghai, CN
• Wenyi Li · Shanghai, CN
• Wanlu Zhang · Shanghai, CN
• Chuan Yuan · Shanghai, CN

Key dates

• Filing date: Oct 23, 2007
• Grant date: May 12, 2009
• Expiry date: Nov 27, 2027

Classification

• Technology area (CPC G): Physics
• CPC primary: G01J2001/4252
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

This invention belongs to the luminous flux measurement field, and especially relates to the equipment and method for LED's total luminous flux measurement with a narrow beam standard light source. The system for LED's total luminous flux measurement with a narrow beam standard light source in this invention comprises an integrating sphere, the light source, a narrow aperture fiber, a spectrometer and a driver for the light source. The light source is lighted by the driver. The narrow beam standard light source (both luminous flux standard and spectrum standard) is placed on the interior surface of integrating sphere, there is not any baffle in the sphere, and a narrow aperture fiber transfers the light to a multi-channel spectrometer which measures the spectrum distribution of LED and calculates its total luminous flux. The equipment in this invention is easy to use, has small error and low cost, and can achieve accurate results for LED's total luminous flux.