激光诱导荧光水质监测系统的研制  

Development of the laser induced fluorescence detecting system for water quality monitoring

作　　者：丁志群[1] 张玉钧[2] 李宏斌[2] 刘文清[2] 

机构地区：[1]宁波工程学院电子与信息工程学院,浙江宁波315016 [2]中国科学院安徽光学精密机械研究所,安徽合肥230031

出　　处：《光学仪器》2009年第4期79-83,共5页Optical Instruments

基　　金：中国科学院创新方向性项目(KGCX2-SW-111)

摘　　要：提出以Nd:YAG激光器的三倍频355nm波长激光为激发光源,以单个光电倍增管(PMT)为探测器,以水体污染监测为目的的激光诱导荧光系统的研制。采用光电倍增管高速双脉冲门控与单次脉冲触发数据采样相结合新技术,有效减少了户外环境下背景光的影响,提高了系统的测量精确度。试验结果表明,该系统能接收水体表面受激发射的荧光信号,探测到的荧光信号经信号处理后与水体受污染程度有良好的相关性。Fluorescence Detecting system for Water quality monitoring based on laser induced fluorescence （LIF） is described in this paper, which is using the 355nm third harmonic Nd： YAG as the excite source and photomultiplier （PMT） as the detector. In order to reduce the background light disturbed, high-speed double pulse trigger PMT in a time data acquisition as an originality innovation is proposed. After combined with background correction and data processing, a better measured resulted is showed in the experiments. There is a good correlation between pollution concentration and the normalization fluorescence intensity of ultraviolet laser induced fluorescence. Therefore this system is high sensitivity and good correlation with pollution concentration for in vivo monitoring polluted water column.

关 键 词：激光诱导荧光 归一化荧光强度 背景扣除 PMT双脉冲门控 

分 类 号：X832[环境科学与工程—环境工程]