Study on a spectrophotometer system for measuring LED's photometric parameters

摘要

LED is quite different from traditional light sources in terms of physical size, flux level, spectrum and spatial distribution. It is a big challenge for measuring LED's photometric parameters This paper developed a multi-channel spectrometer and constructs an equipment using integrating sphere for LED's measurement, then give an example of the measurement result. In this measurement the test LED or a specially designed narrow beam standard lamp is placed on the interior wall of the sphere. A narrow aperture fiber is assembled on the surface of the sphere to transfer the light to the designed multi-channel spectrometer, which calculates the luminous parameters, and there is not any object inside the sphere. Self-absorption by objects (baffles and holders) in the sphere and mismatch of V(λ) will not exist in the flux measuring system for LEDs.