用于点源透射比测试的光电探测装置设计及检测

Design and detection for the photoelectric device used in the point source transmission testing

采用点源透射比法可以对空间光学仪器的杂散光抑制能力进行测试。设计了一套光电探测装置来解决点源透射比测试中宽动态探测范围和微弱信号探测的难题,并搭建一套检测设备对该探测装置的探测动态范围、微弱信号探测能力进行了检测。光电探测装置采用硅光二极管作为光电转换器件,采用增益分级可调的前置放大电路将硅光二极管的光电流转为电压信号并放大输出。使用单色功率为1 W的RGB三光合一激光器作为光源,选择大量程减光片进行减光,搭建检测设备对光电探测装置相关指标进行检测。分别采用蓝、绿、红光激光器作为光源进行了探测实验,实验结果表明,光电探测装置探测动态范围达到10^（10）,弱光探测辐照度为1.74×10^（-7）W/m^2,满足探测动态范围1010,弱光探测阈值10^（-7）W/m^2要求。该套光电探测装置能够满足星敏感器等空间光学仪器的点源透射比法杂散光系数测试要求。

The stray light suppression ability of space optical instrument can be tested by utilizing the method of point source transmission.In this paper,a photoelectric detection device with wide dynamic range is designed to solve the problem of wide dynamic detection range and weak signal detection in the process of point source transmission testing.A testing equipment is built to test the ability of wide dynamic detection range and weak signal detection.Silicon photo-diode is adopted as the photoelectrical conversion device.A preamplifier circuit is utilized to convert the optical current to the amplified voltage output.The RGB unification laser with the 1 W monochromatic power is selected as the light source.The wide range filters are chosen as the optical filter.The related parameters of photoelectric detection device are tested by using the equipment.Three lasers including blue laser,green laser and red laser are employed as the light source for detecting experiment.The experimental results show that the detecting dynamic range can reach 10^（10）,and the irradiance of weak light detection is 1.74 × 10^（-7） W/m^2.The detection ability meets the design requirements that the detection dynamic range is 10^（10） and the irradiance is 10^（-7） W/m^2.Therefore,the designed photoelectric device can satisfy the point source transmission testing of stray light coefficient of space optical equipment,e.g,the star sensor.