System for testing transmissivity uniformity of high-absorption filter

system used for testing transmissivity uniformity of high-absorption filters was developed. Its hardware consists of three major parts, including optical system, photoelectric conversion system and signal acquisition system. Its modularized software was designed based on LabVIEW 8.0. The real-time transmissivity measurement of multi-point distribution based on transmissivity of standard attenuators was computed through moving testing filters controlled by two-dimensional turntable, and the transmissivity error of central point was analyzed. The dynamic range of the system is from 0.001% to 1%, and the relative error is less than 0.1%.