Correlation between simulation and result for plastic automotive head lamp optics

摘要

We present a simple definition of similarity between two lamp beam patterns. We present ideas for achieving similarity between a computer simulation of the photometric performance of an automotive head lamp utilizing a free-form reflector (FFR) and the measured hardware photometric performance of the FFR. To achieve similarity, we perturb the computer generated FFR surfaces, which simulates the tolerances generated on the FFR surface during hardware creation. We present computer simulations of the photometric performance of a designed FFR, computer simulations of the photometric performance of the same designed FFR with the 'perturbation', and measure photometric results of the hardware build of the FFR. We utilize our similarity definition to judge the resemblence between the hardware and software results. Finally we present ideas for further uses of the idea of similarity and ideas to further improve the similarity between computer simulations and actual hardware.