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

Zhou X., Liu M., Qian Y., Wang H., Zhu S.

11th WSEAS International Conference on Automatic Control, Modelling and Simulation, İstanbul, Turkey, 30 May - 01 June 2009, pp.46-47 identifier

  • Publication Type: Conference Paper / Full Text
  • City: İstanbul
  • Country: Turkey
  • Page Numbers: pp.46-47
  • Istanbul Technical University Affiliated: No


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(A) will not exist in the flux measuring system for LEDs.