Radiance output and temperature controlled LED radiance source

US7628507B2 · kind B2 · utility

Assignee

• The United States of America, as Represented by the Secretary of Commerce National Institute of Standards and Technology · US

Inventors

• David W. Allen · Elsmere, US
• Howard W. Yoon · Potomac, US

Key dates

• Filing date: Jun 3, 2005
• Grant date: Dec 8, 2009
• Expiry date: Aug 7, 2026

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N2201/0627
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The LED-radiance source is a suitable replacement of lamp-based integrating sphere sources where they are used as stable and uniform radiance sources. The LED-based radiance source includes an array of LEDs having substantially similar radiance output wavelengths and a radiation detector such as a photodiode that detects and monitors radiation directed from the LEDs. Temperature of the LEDs can be controlled by feedback from a photodiode, thereby allowing for control and stabilization of temperature-dependent radiation output.