紫外吸收法水质监测的光信号探测与处理方法

Optical Signal Detecting and Processing For Water Quality Measurement System by Ultraviolet Absorption Spectrum

在紫外光谱吸收法水质监测中,光信号的探测与处理是一项关键技术。利用双光路单通道循环分时采样方法,在软件控制下分时探测背景、参考、测量光强,消除了由于背景光的干扰和光源强度变化带来的影响,提高了监测系统的可靠性和精确性.并采用了双波段测量方式,用于消除水中浊度的影响,具有很强的实用性.用标准溶液进行了实验,相对标准偏差不超过1%,最大相对误差小于2.0%,说明系统有很高的精确性、准确性.

In water quality measuring methods using ultraviolet spectrum absorption, optical signal detecting techniques are very important. The time-sharing sampling system is adopted to detect background light, reference light and measuring light with one dectector in double light, which can eliminate influences from the drift of source and background. The double wavelength band detection model can decrease the influence of turbidity in water. The techniques make the system more precise and reliable. The standard deviation is less than 1% and the maximum relative error is less than 2% for measurement of standard solutions. The results indicate that the precision and accuracy of the apparatus are good.