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对于光照度不很微弱,且照度测量范围要求较广的情况,用硒光电池或硅光电池作为光电转换电流器件,应用光电流与入射光照度之间的线性关系来测定照度可以达到良好的线性。並且,为仪器的标定工作带来很大的方便。光电池的光电流随入射光照度变化的曲线如图1所示。图1中R为测量光电流I_L的外接采样电阻,图2表示出测量光电池光电流时外接采
For the illumination is not very weak, and the illumination required a wide range of circumstances, the use of selenium cells or silicon photovoltaic cells as the photoelectric conversion current device, the application of photocurrent and incident light illumination to determine the linear relationship between the illumination can achieve good linearity. And, for the calibration of the instrument brings great convenience. The photocurrent of the photocell changes with the incident light curve shown in Figure 1. Figure 1, R is the external sampling resistor to measure the photocurrent I_L, Figure 2 shows the external photocell