基于线阵CCD的液位测量系统设计  

Design of liquid level measurement system based on linear CCD

作　　者：陈成[1] 杨海马[1,2] 涂建坤[2] 刘瑾[1] 乐燕芬[1] 毕继耀 

机构地区：[1]上海理工大学光电信息与计算机工程学院,上海200093 [2]上海电缆研究所,上海200093

出　　处：《电子测量技术》2017年第7期6-10,共5页Electronic Measurement Technology

摘　　要：在化学试剂定容测量领域,试剂的液位高度是重要的被测参数之一。传统的液位测量方法存在测量精度不高、测量数值不连续、难以实现非接触测量等缺陷。通过研究透明化学试剂液位的在线检测方法,设计了一种高精度非接触式的光电液位检测系统,以FPGA为主控制器,驱动线阵CCD进行液位传感,接收经过平行光束透射的光信号,在驱动时序的作用下进行自扫描转换成便于处理的一维图像信号,送PC机中进行处理,对实际液位和图像边缘像素点之间的关系进行分析,实现了液位高度的测量。经实验验证,本系统绝对精度达到10μm,测量分辨率优于2μm。Traditional liquid level measurement methods have many defects,such as measurement accuracy is not high,measurement is not continuous,non contact measurement is difficult to achieve.By studying the transparent reagent liquid level online detection method,the paper designs a kind of non-contact photoelectric liquid level detection system,The system mainly uses FPGA as the main controller,FPGA drives linear array CCD for liquid level sensor,CCD receives the light signal,which is transmitted through the parallel light beam.Under the action of the driving sequence,the optical signal is converted into one dimension image signal which is easy to be processed by the self scanning mode.Then,the image signal is sent to the PC machine for processing.Last,by analyzing the relationship between the actual level and the image edge pixels,so the measurement of liquid level is realized.The experimental prove that the absolute accuracy of the system can reach 10 μm,and the measurement resolution is better than 2 μm.

关 键 词：定容 液位高度 精度高 FPGA 线阵CCD 

分 类 号：TN386.5[电子电信—物理电子学] TP216[自动化与计算机技术—检测技术与自动化装置]