基于FPGA的三通道高精度光学检测仪  

Three-channel High-precision Optical Detecting Instrument Based on FPGA

作　　者：王彬[1,2] 刘军涛[1] 王蜜霞[1] 罗金平[1] 曲书雪[1,2] 蔡新霞[1,2] 

机构地区：[1]中国科学院电子学研究所,北京100190 [2]中国科学院大学电子电气与通信工程学院,北京100049

出　　处：《自动化与仪表》2013年第8期14-17,共4页Automation & Instrumentation

基　　金：国家自然科学基金项目(61027001;61002037;61101048);国家重点基础研究发展计划项目(2011CB933202);中国科学院战略性先导项目专项"面向感知中国的新一代信息科学技术研究"资助(XDA06020101)

摘　　要：为了实现微弱光信号的快速高精度检测,设计了一种基于FPGA的三通道高精度光学检测仪。该仪表利用灵敏度极高的光电转换模块作为感光元件,将光强信号转换为数字脉冲信号,之后利用FPGA对脉冲信号进行高频计数,通过脉冲频率反映光的强弱。在FPGA内部构建了NIOS II作为整个仪表的控制核心,并移植了μC/OS-II操作系统,实现对键盘、液晶、步进电机等模块的控制功能。系统采用了三通道设计,可以同时测量三种不同待测试剂,且三通道间相互干扰小,一致性好,系统噪声低,大大提高了检测效率。在实际发光检测应用中,该仪表灵敏度高,线性度好,检测时间短,成为现场快速光学检测的有效工具。In order to detect weak optical signals quickly and precisely,a three-channel high-precision optical detecting instrument based on FPGA was designed.The system uses a very sensitive photomultiplier tube to be the sensor,transform the strength of light to digital pulse signal,then catch the frequency of the pulse which could reflect the strength of the optical signal.Inside the FPGA,a NIOS II soft core was configured to be the central control,μC/OS-II operating system was transplanted to control the key module,LCD,step motor and so on.The system has three channels which could detect three different kinds of reagent,the interference among the three channels was little,the consistency and the system noise was low,greatly improve the detection efficiency.In the real experiment,the instrument was quite sensitive,the linear response was good and the detecting time was short,so it could be an efficient tool in the rapid detection.

关 键 词：三通道 光子计数 现场可编程逻辑阵列 μC/OS-Ⅱ 

分 类 号：TH77[机械工程—仪器科学与技术]