海水营养盐微弱信号检测技术研究  

Weak signal detection technology of seawater nutrient salt

作　　者：刘杰 刘岩 曹煊 马然 张述伟 郭翠莲 LIU Jie;LIU Yan;CAO Xuan;MA Ran;ZHANG Shu-wei;GUO Cui-lian(Shandong Provincial Key Laboratory of Ocean Environmental Monitoring Technology,Institute of Oceanographic Instrumentation,Qilu University of Technology(Shandong Academy of Sciences),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环境监测技术重点实验室

出　　处：《山东科学》2019年第6期9-14,共6页Shandong Science

基　　金：国家重点研发计划(2016YFC1400800);山东省自然科学基金重大基础研究(ZR2018ZB0523)

摘　　要：基于光电检测原理和锁相放大技术,对海水营养盐微弱信号检测技术进行了研究。采用模拟锁相放大电路对光电二极管的微弱电压信号进行前置放大滤波处理,基于STM32F401硬件平台提出了改进的变步长最小均方自适应滤波算法对微弱信号做进一步滤波提取,最终实现海水营养盐微弱信号的精准检测。仿真和实验数据表明,该技术方案能够提高营养盐传感器的数据准确度和精密度。In this study,we investigated the weak signal detection technology of seawater nutrient salt based on the principle of photoelectric detection and phase-locked amplification technology.In hardware,the weak voltage signal of the photoelectric diode was preamplified to filter the noise using the analog phase-locked amplifier circuit.Based on the STM32F401 hardware platform,the improvement of the variable step size least mean square adaptive filtering algorithm was used in software to filter the noise.Then,the weak voltage signal of the seawater nutrients was accurately detected.Long-term simulation and experimental data denote that the weak signal detection scheme of the seawater nutrients proposed in this study is considerable significance to improve the data accuracy of the nutrient sensor.

关 键 词：营养盐 光电检测 STM32F401 微弱信号检测 模拟锁相放大 变步长最小均方自适应滤波算法 

分 类 号：TP391.8[自动化与计算机技术—计算机应用技术]