针对常规化学检测方法会带来污染和延时的问题,提出一种在线多参数水质监测系统.该系统采用电化学和信息技术相结合的方法,不带来二次污染,可以同时监测水温、pH值、氨氮、COD(化学需氧量)4个参数.系统硬件包括信号调理模块、通信模块、A/D转换和LCD显示模块；系统软件包括单片机控制程序、修改和移植ZigBee协议栈代码、以VC++6.0为开发平台的上位机程序；算法部分运用线性拟合的方法.测试结果表明,该系统具有实时性好、节点功耗低、成本低、可扩展性强等特点,基本满足室外在线监测的需求.%Conventional chemical detection method will bring issues of pollution and delay,so an online multiparameter water quality monitoring system is proposed.Combined with electrochemistry and ZigBee technology,It does.not bring secondary pollution and can simultaneously monitor four parameters such as water temperature,pH,NH3-N and COD (chemical oxygen demand).The system hardware design includes signal conditioning module,communication module,A/D conversion and LCD display module.The System software design includes microprocessor control program,code for ZigBee protocol stack modification and transplantation and an upper computer program developed on VC++ 6.0 platform.the algorithm uses linear fitting method.The test results show that the system has advantages of good real-time processing,low power consuming,low cost and flexible expansibility,and basically meet the demand for outdoor online monitoring.
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