Design of Photoelectric Signal Parameter Test System for Liquid Crystal Filters

Abstract

The system studied in this study is specifically used for the measurement of the optical transmittance of liquid crystal filters. In practical applications, liquid crystal filters are mainly used in the production of welding masks. Therefore, the optical transmittance of the liquid crystal filter is an important parameter of the entire liquid crystal material, which is of great significance to the performance of the welding mask products. This study is aimed at the optical transmittance measurement system with white light as the light source. The system include s a light source, an integrating sphere, and a luxmeter. The core point of this system is that the photodetector detects the electrical signal at the opening on the side of the integrating sphere and compares it with the standard illuminance meter. The light intensity measured at the front opening is subjected to a fitting calibration, so that the detected optical signal measured at the opening on the side of the integrating sphere represents the light intensity at the front opening of the integrating sphere. The equipment needs to be measured in a dark room. The test results prove that the low collimation of the light source has a certain impact on the experimental results. The test results show that after debugging, the light signal detected at the opening on the side of the integrating sphere can accurately represent the light intensity measured by the standard illuminance meter at the front opening.