摘要
针对常规浊度测量方法受背景光影响大的问题,采用了数字锁相放大原理与常规浊度测量相结合的方法对微弱光电信号进行处理。采用数字正交锁相放大技术提取待检测信号的幅值与相位,消除了信号延迟及环境背景光的影响,有效提升该系统检测精度、范围及被检测信号信噪比。通过对系统进行优化,实现了浊度检测仪器的微型化和低成本化。利用所研制微型浊度检测仪器的实际测试实验表明,总体检测精度为±3%FS,测量范围为0~2000 NTU达到设计要求,能够满足常规测量需求。
Aiming at the conventional turbidity measurement method is greatly affected by the background light,the combination of digital phase-locked amplification and traditional turbidity measurement is used to detect the weak photoelectric signal.Digital quadrature phase-locked amplification technology extracts the amplitude and phase of the signal to be measured,eliminating the effects of signal delay and background light,and improving the detection accuracy of the system and the SNR of the detected signal.Optimized by the system to achieve miniaturization and low cost of the turbidity detection instrument.The actual test using the developed micro turbidity detection instrument shows that the overall test accuracy is±3%FS and the measurement range is 0~2000 NTU,which meet the design requirements and can meet the conventional measurement requirements.
作者
郑杰
刘超
胡成立
郑凯
Zheng Jie;Liu Chao;Hu Chengli;Zheng Kai(College of Electronic Science,Northeast Petroleum University,Daqing 163318,China)
出处
《电子测量技术》
2020年第6期77-82,共6页
Electronic Measurement Technology
基金
“黑龙江省油气藏形成机理与资源评价重点实验室”开放基金(KL20190110)项目资助。
关键词
数字锁相
水质浊度
转换电路
红外光电检测
digital lock-in amplifier
water turbidity
switching circuit
infrared photoelectricity detection
作者简介
郑杰,硕士研究生,主要研究方向为智能测试技术及仪器。E-mail:935603423@qq.com。
