1.导言测定光谱灵敏的 PIN 型硅光电管因其使用简便而适合作光辐射测量用的工作探测器。作为电流-电压互感器的运算放大器可将光电流变换成便于测量的电压约1V。此外,光电管较之热电堆的机械结构牢固,且不受背景辐射和气流的影响。此外它的动态区域要比热探测器的大得多,用同一光电管既可测10~(-5)Wm~(-2)以 1. INTRODUCTION Photodetecting sensitive PIN-type silicon phototransistors are suitable as working detectors for optical radiation measurements because of their ease of use. An op amp, as a current-voltage transformer, converts the photocurrent to a voltage of about 1V for easy measurement. In addition, the phototube has a stronger mechanical structure than the thermopile and is immune to background radiation and airflow. In addition, its dynamic range than the thermal detector is much larger, with the same photocell can be measured 10 ~ (-5) Wm ~ (-2) to