Quantitative Testing and Data Processing for the Extinction Ratio of the Star Sensor Hood

For the stray light suppression requirement of star sensor in orbit operation,the research on the extinction ratio quantitative test and data processing method of star sensor hood is carried out.The stray light integrated test platform is built based on the high-sensitivity detection module for weak light,high-precision electronically controlled turntable and solar simulator.The real-time measurement data of the extinction ratio of the hood under different incident angles are obtained by the driving of the stepping motor of the electronic control turntable.The extinction ratio of the hood is calculated according to the constructed data processing model,and the uncertainty analysis of the extinction ratio measurement is completed based on the class A uncertainty evaluation method.It can be seen from the measurement results that the extinction ratio measurement value reaches 10-6 when the incident zenith angle reaches 30 degrees which is the protection angle.At the same time,when the incident zenith angle is 54 degrees,the extinction ratio measurement value reaches 10-7.Moreover,the variation of data under multiple measurements is basically the same.The measurement results show the rationality and feasibility of the measurement scheme,and it can provide important technical support for the design,test and evaluation of the star sensor system.

A quantitative testing method for the stray light suppression level of the light shield has been developed to meet the stray light suppression requirements of star sensors in orbit. A reasonable measurement scheme was designed, a precise measurement platform was built, and the ratio of the exit luminous flux to the entrance luminous flux of the hood under different incident light irradiation angles, namely the hood extinction ratio, was measured. The uncertainty analysis of extinction ratio measurement was completed based on the Class A uncertainty evaluation method. From the measurement results, it can be seen that when the incident zenith angle of light reaches a protection angle of 30 °, the measured extinction ratio reaches the order of 10 ^ -6; When the incident zenith angle of light is 54 °, the measured extinction ratio reaches the order of 10 ^ -7, and the variation pattern of multiple measurement data is basically consistent. The measurement results have verified the rationality and feasibility of the measurement scheme, providing a reliable technical means for the testing and evaluation of existing star sensor products, and providing important technical support for the design and optimization of the next generation star sensor products.