摘要
为了研究海水吸光度传感器的工作原理和误差来源,搭建了搭载645 nm光源的海水吸光度测量系统,根据郎伯-比尔定律、误差传递原理和吸光度传感器结构,对海水吸光度测量系统进行了分析,并通过重复性测试和吸光度测量实验对该系统的稳定性和吸光度探测能力进行了实验验证。重复性测试实验结果显示,使用测量前标定的方法可以将误差控制在±0.008 3 m^(-1)以内,其中由光源和光电传感器引起的误差为±0.006 7 m^(-1),样品池加工引起的误差为±0.0016 m^(-1)。吸光度测量实验结果显示,超纯水的测量结果存在-0.019 44~-0.017 08 m^(-1)的光学吸收系数负测量偏差,自来水的光学吸收系数比超纯水的光学吸收系数大0.005 68 m^(-1),3%的氯化钠溶质可以使光学吸收系数增大0.097 56m^(-1)是自来水杂质引发增大量的17.2倍,海水中溶质可以使光学吸收系数增大0.726 32 m^(-1),是3%的氯化钠溶质引发增大量的7.4倍。以上结果表明,系统各模块引起的测量误差较小,符合吸光度测量要求,有能力探测出溶液中溶质对吸光度的影响,但存在一定的负测量误差。
Seawater absorbance sensor is an important equipment for marine environment research. In order to analyze and study the working principle and error source of this equipment,a seawater absorbance measurement system equipped with 645 nm light source was constructed. Firstly,in accordance with the Lambert-Beer law,error transfer principle and structure of the absorbance sensor,the working principle and error source of the seawater absorbance measurement system were analyzed. Then,repeatability tests and absorbance measurement experiments were used to verify the stability and absorbance detection of the system. The results of repeatability tests show that the error can be controlled within ±0. 008 3 m^(-1) by using the calibration-before-measurement method,in which the error caused by the light source and photoelectric sensor is approximately ±0. 006 7 m^(-1),and the error caused by the sample cell processing is approximately ±0. 001 6 m^(-1). The results of the absorbance measurement experiment are as follows:there is a negative measurement error of absorption coefficient from-0. 019 44 m^(-1) to-0. 017 08 m^(-1) for ultrapure water;the absorption coefficient of tap water is 0. 005 68/m higher than that of ultrapure water;3%concentration of sodium chloride solute can increase the absorptivity by 0. 097 56 m^(-1),which is 17. 2 times of the increase caused by impurities in tap water;the solute in seawater can increase the absorptivity by0. 726 32 m^(-1),which is 7. 4 times of that induced by 3% concentration of sodium chloride solute. The results given above show that:the measurement error caused by the modules in the seawater absorbance measurement system in this paper is small,which meets the requirements of absorbance measurement experiment;the seawater absorbance measurement system presented here can detect the influence of solute on absorbance,but there is a negative measurement error in the absorbance measurement data.
作者
穆壮壮
赵强
李晋
孟凡利
MU Zhuang-zhuang;ZHAO qiang;LI Jin;MENG Fan-li(College of Information Science and Engineering,Northeastern University,Shenyang 110819,China;Hebei Key Laboratory of Micro-Nano Precision Optical Sensing and Measurement Technology,Qinhuangdao 066004,China;Institute of Oceanographic Instrumentation,Qilu University of Technology(Shandong Academy of Sciences),Qingdao 266061,China)
出处
《光学精密工程》
EI
CAS
CSCD
北大核心
2021年第8期1751-1758,共8页
Optics and Precision Engineering
基金
国家重点研发计划课题(No.2019YFB2006001)
河北省自然科学基金资助项目(No.F2020501040)
山东省自然基金面上项目(No.ZR2019MF022)
山东省军民融合项目(No.2019JMRH0105)。
关键词
海洋光学
光学遥感
水色检测
吸光度
optical oceanography
optical remote sensing
ocean colour sensing
absorbance
