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.

Abstract: An LED-based radiance source that is compact, temporally stable and uniform, and particularly useful in applications such as calibration and characterization of radiation thermometers, night vision devices, environmental remote sensing systems, biological agent detection, and any radiometer which needs a stable radiance source. The LED-based 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 the photodiode, thereby allowing for control and stabilization of temperature-dependent radiation output.