COMPUTER-SIMULATION OF INTEGRATING SPHERE S

Computer simulation of integrating spheres. By tracking a large number of photons in an integrating sphere a powerful simulation model for c alculating the wail irradiance of an integrating sphere by means of a digital computer is achieved. The model can predict its spatial distri bution as well as its lime dependence at a given pulse shape of the st imulating radiant flux. Further disturbing bodies in the sphere volume (shaders) and in the sphere wall (specimen, detector, openings) can b e considered with their specific reflectance and their reflection indi catrix. A comparison of simulation results with analytical results for the ''ideal'' integrating sphere proves an excellent agreement with t he theory. As an example demonstrating the performance of the model th e short-time process In the sphere between turning on tbe stimulating radiant flux and the condition of a uni form irradiance distribution i s pointed out.