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基于ARM的嵌入式QCM检测仪器的研究
【作者】 李海威；
【导师】 吕运朋；
【作者基本信息】 郑州大学 ， 测试计量技术及仪器， 2009， 硕士
【摘要】 石英晶体微天平(Quartz Crystal Microbalance,QCM)传感器可检测电极表面纳克级的质量变化和反应膜的粘弹性、溶液密度、粘度、电导率、介电常数等参数的改变。其具有高特异性、高灵敏度、响应快等特点,可广泛应用于化学、物理、生物、医学和表面科学等领域中,可以用于气体、液体的成分分析以及微质量元素的测量等。本课题以石英晶体微天平传感器技术为基础,采用ARM嵌入式技术、现代电子技术和与压电石英传感器技术相融合,开发出了具有灵敏度高、可选择性好、操作简便、可实时检测输出检测结果的压电石英传感器信号采集处理系统。通过测量每个通道检测池输出频率、电压、温度等的变化,来对微量元素成份或质量、浓度、粘度等进行分析、测量,并可实时输出扫描电压到检测池,实时采集检测池数据,便可进行化学、生物等精密实验之用。基于ARM的嵌入式QCM检测仪器主要由前端传感器检测电路、数据采集系统和数据处理系统等组成。根据前端QCM传感器振荡电路输出的信号,数据采集系统进行实时采集、控制、处理、传输。根据用户需要,可将采集数据处理后发送到LCD液晶屏实时的进行数据显示、动态曲线显示、通道之间曲线切换、采集数据实时打印、存储等功能,并可经由32位独立按键的键盘进行各种控制操作等;或将采集数据,由基于ARM7内核的处理器LPC2220处理后上传到PC机进行数据、曲线的显示、描绘、切换等。
【Abstract】 Quartz Crystal Microbalance(QCM) sensor can sensitively detect the changes in electrode mass down to the nanogram level and the change of loading and film viscoelasticity as well as solution viscosity, density, conductivity and dielectric. It can provide properties of high specificity, sensitivity, rapid response, mini-type and simplicity. It can be used widely in chemistry, physics, biology, medicine, surface science. It is also expected to find wider applications in analyzing of gas , liquid and the detecting of tiny mass.This item designed the QCM signal collection system, which has the advantage of high sensitivity, selectivity, easy of using and can output the result of the measure in real-time, based on the QCM sensor and the using of the embedded technology of ARM, the modern electronic technology and the QCM. Also it can supply model for kinds of applications and provide guarantee for more develop. This apparatus has two channels. Every channel can measure the frequency, voltage, temperature of the input signal. After that, It can deal with the element, mass, thickness, conglutination and give the report. If you want to do some experiment in chemistry or physics, then you can add the DAC out to the detect pool, and of course, you can get the result of the reaction exactly.The embedded high precision detect instrument based on ARM, is consist of the front sensor detect unit, the gather system unit and the deal system unit. It can sample the sensor output singal,and send the data to LCD to display and curve kinds of figure,such as F-T,V-T,F-V and so on. Also it can send the data to PC, which gets across the RS232. And the PC will display the data ,curve the figure and do any other things needed.