原位海水总磷总氮传感器的微光信号检测电路设计  

Design of Detection Circuit of Total Nitrogen and Total Phosphorus Sensor

作　　者：吴宁 马海款 曹煊 褚东志 张述伟 张盈盈 张颖 张丽 张天鹏 WU Ning;MA Hai-kuan;CAO Xuan;CHU Dong-zhi;ZHANG Shu-wei;ZHANG Ying-ying;ZHANG Ying;ZHANG Li;ZHANG Tian-peng(Institute of Oceanographic Instrumentation,Qilu University of Technology (Shandong Academy of Sciences),Shandong Provincial Key Laboratory of Ocean Enviromental Monitoring Technology,National Engineering andTechnological Research Center of Marine Monitoring Equipment,Qingdao 266001,China)

机构地区：[1]齐鲁工业大学(山东省科学院)山东省科学院海洋仪器仪表研究所山东省海洋监测仪器装备技术重点实验室国家海洋监测设备工程技术研究中心

出　　处：《仪表技术与传感器》2019年第8期1-3,共3页Instrument Technique and Sensor

摘　　要：为实现海水原位总磷总氮传感器的微光信号检测,设计了基于正交同步检波功能的电路,分别对完全消解、显色后的海水样品进行不同波长条件下分光光度测量。对不同波长LED进行调制和信号的I/V转换,正交同步检波电路完成微光信号检测;经A/D转换,低通滤波电路后输入单片机进行处理;通过数字滤波算法进行平滑降噪处理,实现原位海水总磷总氮传感器的微光信号检测。实验表明:基于该电路的传感器具有精度高、稳定性好,抗干扰能力强、功耗低等优点。In order to detect the low-light signal of the total phosphorus and nitrogen sensor in situ in seawater,a circuit based on the function of orthogonal synchronous wave detection was designed.The completely dissolved and colored sea water samples with different wavelengths were measured by spectrophotometry.Different wavelength LED was modulation and signal was I/V conversed,orthogonal synchronization detection circuit completed low-light signal detection.After A/D conversion,the low-pass filter circuit is input into the single-chip microcomputer for processing.The low-light signal detection of total phosphorus and nitrogen sensor in situ is realized by smoothing noise reduction by digital filtering algorithm.Experiments show that the sensor based on this circuit has the advantages of high precision,good stability,strong anti-interference ability and low power consumption.

关 键 词：传感器 总磷总氮 光信号 同步检波 分光光度 

分 类 号：TH13[机械工程—机械制造及自动化]