基于FPGA的三通道高精度光学检测仪
王彬;刘军涛;王蜜霞;罗金平;曲书雪;蔡新霞
【期刊名称】《自动化与仪表》 【年(卷),期】2013(028)008
【摘要】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.%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、
基于FPGA的三通道高精度光学检测仪
