In the process of designing and adjusting the solar simulator, the side lobe effect and aberration of the optical integrator affect the irradiation uniformity, an integrating sphere is proposed to replace the optical integrator for uniform light and the compound parabolic reflector for beam shaping. First, based on the equal illuminance theorem and the radiation transfer theory, the calculation formula of the energy transmission efficiency of the porous integrating sphere is derived; Then, the light hole illuminance interference factor is introduced, and the effects of the aperture size of the integrating sphere, the radius of the integrating sphere, and the size and position of the baffle on the energy transmission efficiency and irradiation uniformity are analyzed. Finally, an integrating sphere uniform light system with high energy transmission efficiency and uniformity is designed and simulated with LightTools software. The simulation results show that: the average difference of irradiation uniformity and the range difference of irradiation uniformity are closest to 1 in the area where the ratio of the opening size and radius of the integrating sphere is 36%-40%, and the light is evenly distributed; When the baffle position is 0.8 times of integrating sphere radius away from the light entrance hole, irradiation non-uniformity at the outlet hole is 1.99%, which is the best position of the baffle; In the effective irradiation surface of Φ1032 mm, the irradiation non-uniformity is 1.98%, and the maximum irradiance is 0.62 solar constants, the spot simulation with high irradiation uniformity on large irradiation surface is realized.

Aiming at the problem of low irradiation uniformity in existing solar simulators with large irradiation surface, a new optical design method of off-axis TMA (three-mirror anastigmat) solar simulators with large irradiation surface high uniformity was proposed. Three groups of short arc xenon lamps and noncoaxial ellipsoid mirror are used as composite light sources, the causes of stray light in optical integrator are clarified, and the optimization design method of integrator based on anti-crosstalk diaphragm is proposed. The light propagation matrix model of the optical system of the solar simulator is established to effectively suppress stray light in the integrator, and the influence of the aberration of the collimating system on the irradiation uniformity was analyzed. A optical system of object side telecentric off-axis TMA was designed to achieve high uniform illumination with large irradiation area. The results show that in the Φ500mm irradiation surface, the irradiance of the system is better than 1S0 (1367 w/m 2 ), up to 1656 w/m 2 , irradiation uniformity is 98.29%, this research can provide accurate and reliable solar radiation for space environment experiment of satellite load and make up for the limitation of low irradiation uniformity of traditional solar simulators with large irradiation surface.