根据CCD器件只适于检测直流或缓变交流信号的特点,基于CCD膜厚监控系统和CCD探测器的强背景噪声环境,利用步进电机的可控、可知性,实现了步进电机与CCD数据采集卡的精确匹配,完成了信号在亮周期和暗周期中的精确采样。结果表明,背景噪声得到了有效的抑制,保证了实测光谱曲线的准确性。 According to the CCD device only suitable for detecting DC or slow change AC signal characteristics, based on the CCD film thickness monitoring system and CCD detector strong background noise environment, the use of stepper motor controllability, the realization of the stepper motor and the CCD The exact match of the data acquisition card completes the accurate sampling of signals in bright and dark cycles. The results show that the background noise is effectively suppressed, which ensures the accuracy of the measured spectral curve.