Fast and high-accuracy spectral measurements of LED by linear CCD sensor and software calibration

Abstract

The paper discusses practical aspects of LED measurements and problems about how to improve the measurement accuracy of LED spectral properties when using linear CCD sensor. Designed and implemented an instrument for LED spectral measurement based on linear CCD sensor. The CCD sensor has 2048 pixels and ultra-high sensitivity. The duration of one measurement is about 10ms. For reducing the effect of CCD output noise, a software filtering method is introduced. After software calibration, the accuracy of color temperature is 40K in the range of 1300K to 25000K, and accuracy of wavelength is 0.2nm in the range of 360nm to760nm. The accuracy of chromaticity coordinated (x, y) or (u, v) is better than 0.003.