Radiometric characteristics simulation of large aperture integrating sphere bosed on LightTools

In order to develop the large aperture integrating sphere with perfect radiometric characteristics, 15 integrating sphere models with 5 different lamp positions and 3 different illumination models were built and simulated by LightTools, and their irradiance plan uniformity and Lambert characteristic were analyzed. Compared with designing by experience, computer simulation has the advantage of short period, low cost and good repeatability. Simulation results indicate that lamp positions and illumination models have less effect on irradiance plan uniformity, however have more effect on Lambert characteristic. The Lambert characteristic of lamp direction is worse than other directions, symmetrical illumination model improves the Lambert characteristic, and the Lambert characteristic usually becomes better with the distance between the light source and the joint plan of both hemispheres increasing. The irradiance plan uniformity, the Lambert characteristic of light source's direction and the Lambert characteristic of light source's vertical direction of a 3 m integrating sphere were tested, with different illumination models, and the measured performance agreed well with simulation results.