The solar simulator provides a fixed and standard light environment for vehicle performance test research, free from the influence of time and space changes in the outdoor environment. In view of the complex structure and high cost of the solar simulator with parallelism, a set of simple and effective solar parallel light simulators was made based on the principle of light transmission. After comparison, a xenon lamp was selected as the light source, and a convex lens was used to make a parallel light source scheme. The simple solar simulator includes the following parts: light source and circuit accessories (transformer, trigger, high-voltage wire, lamp bracket); optical accessories (lens and lamp cup); synchronous \"U\"-shaped support frame (connecting the sensor and solar simulator at the same time). After SPSS analysis, the experimental results show that there is no obvious difference in the projection area of the baffle at different heights and different positions, proving that the system meets the requirements of parallel performance within the output range of the lens area. In addition, there is a significant difference in energy between the baffle and the non-baffle, proving that the direct energy is much greater than the scattered energy in the test environment. Keywords:Solar simulator, xenon lamp, convex, direct radiationAbstract: Solar simulator provides plant experiment and research fixed and standard light environment avoiding space and climate change effect. For solving problems of complication and high cost by solar simulator with certain parallel degree, a simple but effective solar simulator was built with xenon lamp and convex selected. Lamp with circuit fittings such as transformer, trigger, high voltage line and frame and optical fittings such as convex and lamp cup are included in the simulator. After analysis by SPSS, there is no apparent difference among shadow areas in different heights and positions, which shows that the parallel degree is satisfied within convex area. Additionally, there is here is extreme difference between no leaf and having leaf conditions, which shows that direct radiation is so far bigger than diffuse radiation.Key words:Solar simulator, xenon lamp, convex, direct radiation
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