Smart COD sensor using UV-Vis spectroscopy against optical window surface contamination
Smart COD sensor using UV-Vis spectroscopy against optical window surface contamination
复制标题
使用紫外可见光谱的智能 COD 传感器可防止光学窗口表面污染
DOI：
10.1016/j.measurement.2021.110125
复制
发表时间：
2021-10-09
期刊：
影响因子：
5.6
通讯作者：
Zhang, Quan
中科院分区：
文献类型：
--
作者：
Kang, Zhaofeng;He, Zixing;Zhang, Quan
紫外-可见吸收光谱法是化学需氧量（COD）实时无污染测量的典型方法，但长期监测时，测量系统光学窗口表面的污染影响测量精度。提出了一种光学窗口表面污染补偿方法，并研制了一种多波长智能COD传感器。本研究以等效吸收光谱（EAS）来描述OWSC，并探讨其光谱特性。因此，我们可以根据测量的380 - 440 nm之间的吸收光谱预测OWSC在250 - 380 nm之间的EAS，并减去OWSC的EAS，得到COD的吸光度，以完成光谱补偿。设计了一种智能COD传感器，具有实时报警、免维护等优点。通过对COD传感器的实验，证明了OWSC补偿具有良好的适用性，可以实现COD的长期准确测量。
A typical method for real-time and unpolluted measurement of chemical oxygen demand (COD) is UV-Vis absorption spectroscopy, however, contamination of the measuring system's optical window surface affects the measurement accuracy during long-term monitoring. This study proposes an optical window surface contamination (OWSC) compensation method, and a multi-wavelength smart sensor for long-term accurate COD measurement was developed. This study uses equivalent absorption spectrum (EAS) to describe OWSC, and explores its spectral characteristics. Therefore, we can predict the EAS of OWSC between 250 and 380 nm based on the measured absorption spectrum between 380 and 440 nm, and subtract the EAS of OWSC to get the absorbance of COD to complete the spectrum compensation. Furthermore, we designed a smart COD sensor which has the advantages of real-time warning and maintenance-free. We proved that the OWSC compensation has excellent applicability through experiments using the COD sensor, and long-term accurate COD measurement can be achieved.