基于脉冲宽度调制技术的水浊度探测研究  

Water Turbidity Measurement with Pulse Width Modulation

作　　者：张恺[1,2] 张玉钧[1] 殷高方[1] 石朝毅[1] 于绍慧[1] 王志刚[1] 肖雪[1] 王欢博[1] 段静波[1] 刘文清[1] 

机构地区：[1]中国科学院安徽光学精密机械研究所中国科学院环境光学与技术重点实验室,安徽合肥230031 [2]安徽省环境光学监测技术重点实验室,安徽合肥230031

出　　处：《大气与环境光学学报》2012年第1期63-70,共8页Journal of Atmospheric and Environmental Optics

基　　金：国家863计划(2007AA061502;2009AA063005);安徽省重大科技专项(08010301107);安徽省自然科学基金(090415215)

摘　　要：介绍了水浊度常用的测量方法-散射法、透射法及比值法的原理,在此基础上结合脉冲宽度调制(PWM)解调技术,提出了采用调制光强测量浊度的方法,并详细介绍了实验系统的组成和调制解调实现电路.采用该实验系统对福尔马肼标准液进行测量,列出了测量数据,并绘出三种方法所测浊度的拟合曲线。对实验结果的分析和比较表明使用PWM调制结合比值法能最有效地排除背景光的干扰,在保证精度的前提下提高水浊度的测量范围.The principles of three common measuring methods of the water turbidity,scattering method, transmission method and ratio method are introduced.Combined with pulse width modulation（PWM） and demodulation technique,the method for turbidity measurement using light intensity modulation is proposed and the experimental system and the realizing circuit of modulation and demodulation is described in detail. The experimental system is used to measure the turbidity of Formazine standard solution of different turbidity values.The measured data is listed,then the turbidity values fitting curve using the three methods are drawn. Through the analysis and comparison of the experimental results,it＇s showed that when using the ratio method combined with the modulation technique,the interference of background light can be eliminated effectively, so the measuring range of the water turbidity can be improved with high measuring accuracy.

关 键 词：浊度测量 散射 透射 比值法 脉冲宽度调制 单片机 

分 类 号：X832[环境科学与工程—环境工程]