Numerical analysis of the thermal effect of the spaceborne detector irradiated by the pulsed laser carried by the accompanying satelite

摘要

Based on the heat conduction theory, the theoretical model of the spaceborne mercury cadmium telluride(HgCdTe) detector irradiated by the pulsed laser carried by the accompanying satelite is proposed. The method of applying the moving heat source on the focal plane of the detector is used to analyze the thermal effect of HgCdTe detector when the pulsed laser beam and the HgCdTe detector are under the condition of relative movement. The thermal effect of the detector under different moving velocities of the laser beam is studied, and the melting damage thresholds of the monopulse laser beam at different moving speeds are obtained. The results show that, when the spaceborne HgCdTe detector is irradiated by the satelite-borne pulsed laser, the faster the relative moving speed is, the lower the peak temperature is at the end of the pulse, the smaller of the slope of the temperature rise curve and the slower of the temperature rise. The damage threshold of the monopulse laser at different moving speeds increases with the increase of velocity, and is approximately linear with the moving velocity.