Experimental and Simulation Research on the Laser Irradiation Effects of Star Tracker

star sensors is the attitude measurement equipment that satellite mainly depends on in orbit operation stage. It is an important part of satellite guidance, navigation and control subsystem. The star sensor is easily damaged by laser irradiation during its on orbit operation. This paper studies this problem, designs and carries out the damage experiment of laser irradiation and simulation modeling of the star sensor, and completes the model verification. The results show that the laser power density is in the range of 1.2～3.5 ×10 ⁵ W/cm ² , and the APS detector of star sensor has damage effects such as line damage, cross damage and large-area damage. The micro morphology observation shows that the circuit layer above the photosensitive element of the detector is damaged. Based on the finite element analysis method, the probability model of APS detector damaged by laser is established. The simulation results are in good agreement with the experimental values, which provides data support and analysis model for studying the damage effect of laser on star sensor.

This article investigates the problem of laser irradiation damage to typical star sensor APS detectors. A finite element analysis method was used to establish a simulation analysis model for the thermal effect of laser damage to star sensor detectors. The corresponding relationship between laser power density and damage probability of typical star sensor APS detectors was obtained. Laser damage experiments were conducted on typical star sensor APS detectors. The experimental results show that when the laser power density is between 1.2 and 3.5 × When 10⁵W/cm², the resolution is 2 048 pixels × The APS star sensor with a 2048 pixel and an optical aperture of 60 mm will exhibit damage effects such as line damage, cross damage, and large area damage. Through microscopic morphology observation, it was found that the detector circuit layer and photosensitive surface were damaged. The experimental results and simulation results have good consistency. The conclusion of this article provides important data reference for conducting research on laser damage and protection of space-based optical equipment.