An Irradiance Uniformity Reshaping Method for Solar Simulators Based on Computer Generated Spatial Filter Films

• ZeSheng Qin, Jia-Yong Song, Changwen Xue, Haojie Li, Chang Ma, Lifeng Bian, and Chen Yang
• received 12/18/2023; accepted 04/15/2024; posted 04/15/2024; Doc. ID 516380
• Abstract: The irradiance uniformity is critical to the accuracy of photovoltaic device testresults. Therefore, to post-correct the irradiance uniformity inherent in artificial lightingsystems, a spatial irradiance filter scheme for film patterns is proposed based on the physicalphenomenon of a positively related relationship between inkjet concentration and thetransparency of the flexible film. The scheme first establishes the characteristic equationbetween the irradiance absorption and pattern grayscale values and then generates the spatialfiltering pattern by utilizing the light intensity distribution to be calibrated, matrix operations,and bilinear interpolation. To evaluate its performance, an STM32 microprocessor-basedirradiance distribution measurement system was developed and used to test and verify singlelamp, planar array, and curved surface array light sources. The results reveal that the correctedirradiance uniformity improves by 15.5%, 24. 01 %, and 13.11%, all of which achieve the ClassA irradiance uniformity of the IEC 60904-9 standard.