基于LED光谱可调谐光源的光电探测器相对光谱响应测量研究

Measurement of Relative Spectral Responsivity of Photodetector by LED-Based Spectrum-Tunable Source

提出了采用LED光谱可调谐光源测量光电探测器相对光谱响应,详细论述了测量原理和算法,计算中将辐射传输积分方程改写成求和方程,求和值与积分值的近似程度与波长间隔大小的选择有关,仿真分析了不同色温黑体作为探测目标时硅光电探测器和CCD在不同波长间隔下的信号求和值与积分值差异。仿真结果表明:10nm波长间隔时,探测器信号求和值和积分值差异在0.2%以内,是波长间隔的理想值。最后分析了影响该方法测量精度的因素及其解决方案。该测量方法结构简单,避免了单色仪等仪器的测量传递误差。

A method of determining relative spectral responsivity of photodetector by LED-based spectrum-tunable integrating sphere source is put forward,and the measuring principle and algorithm are exhaustively described.In the course of calculation,the radiant transmission integral equation was changed into summation formula,and the degree of approximation between integral value and summation value is related to the selected wavelength interval.The differences between integral value and summation value in different wavelength intervals of Si photodiode and CCD were simulated and analyzed.The simulated results demonstrated that the relative differences between signal integral value and signal summation value of Si photodiode and CCD were below 0.2% in 10 nm interval,so 10 nm interval was an ideal choice.In the end,the factors affecting measurement accuracy were discussed and the solution suggestions were given.This method is easy in structure,and it avoids the measurement transmission errors of some instruments,such as monochromator.