紫外可见双路分光光度计系统研究

System studies to double beam ultraviolet-visible spectrophotometer

本文完全不用两束单色光λ1、λ2(Δλ=1～2nm)快速交替通过检测器产生交流信号的双波长扫描模式而是采用一束光通过半反透镜结构对双路光电探测器输出信号同步采样的数据处理结构较好地抑制了温漂和器件特性分布误差进而降低了系统噪声;而直接片内电流积分、电荷采样有效地避免各级放大电路电压转换累计误差同时去掉中间放大环节减少干扰;调零、减法运算、对数转换等功能均在数字信号处理控制器内完成充分发挥了数字控制的优势从而有效地提高了光度计系统的综合性能指标。

In this paper,two pairs of dual photoelectric detectors are placed simultaneously for signal acquisition and processing of data,which turns out to be better suppression of the drift and distribution of errors of devices and thus reduces the system noise finally.The direct current integration on-chip and the charge sampling effectively avoid cumulative errors and full advantages of digital integrated circuits and digital signal processing system expand.