节点文献

微力传感器系统设计及在AFM中的应用研究

Design of Micro-force Sensor System and Study on Its Application on the Atomic Force Microscopy

【作者】 宋志杨

【导师】 董维杰;

【作者基本信息】 大连理工大学 , 电路与系统, 2009, 硕士

【摘要】 基于测量范德华力制成的原子力显微镜(Atomic Force Microscopy,AFM),现在已经广泛应用于化学、物理、表面科学等微观领域。压电式传感器和执行器具有结构简单、响应速度快、高频适用性强、驱动和处理电路简单等特点,在精密位移,精密定位、声学及力学量的检测等方面已经得到了广泛的应用。压电微悬臂在AFM中的应用是近十年的研究工作,一般用于位移传感、力传感和高速反馈定位。本文研究了基于PZT双片压电悬臂的微力传感器特性,并对该传感器应用于AFM进行了初步探索。为了提取和检测双片梁微弱的压电信号,搭建了基于电荷放大模块与锁相放大模块的微弱信号检测模块,具有体积小、重量轻和使用方便等优点。结合双片压电微悬臂梁在AFM中的实际应用模式,对其进行了机械特性和电学特性的测试测量,包括微悬臂法向弹性系数测量、准静态传感特性分析、静态执行特性测试、执行传感集成的谐频响应特性测试和一阶固有频率检测,并利用压电双晶片对双片梁对样品表面形貌扫描的微力测试进行了模拟,验证了双片结构的压电梁在微力感知与微位移检测方面的适用性。压电陶瓷管扫描器是AFM中的核心器件之一,在AFM工作时完成对样品X、Y方向的扫描,为了精确控制其扫描偏移量,搭建了基于LabVIEW虚拟仪器技术的测试平台,对其X/Y方向的微位移进行了检测,根据等间隔扫描的工作特点,提出简易非线性校正方法,大大降低了位移滞回偏差。研究表明双片结构的PZT压电微悬臂梁由于集成了执行与传感能力,在微力感知与微位移检测方面是适用的。在现有工艺和测量方法的基础上,若继续改善梁尺寸结构提高其电荷位移分辨率,则最终可以代替传统微悬臂应用到AFM系统。

【Abstract】 Atomic Force Microscopy(AFM), made through testing the micro-force, is widely used in chemistry、physics、surface sciences、material sciences and life sciences, etc. Piezoelectric sensors and actuators with many advantages including simple structure, fast response, high frequency and simple driving, have been extensively applied. The research on the AFM application of micro piezoelectric cantilever is carried in these ten years, generally utilized in displacement sensing、force sensing and fast feedback orientation.The characteristic of the 2-segmented piezoelectric micro-cantilever is studied, along with its application in AFM. The main work includes making the separated micro-cantilever, forming the testing module for micro- piezoelectric signal, testing the mechanic and electric characteristics of the cantilever, building a simple way of measurement and correction for micro-displacement of ceramic tube, and analyzing its apply feasibility on the AFM. For the distilling and measuring of sensing charge, a special charge amplifying bulk and a special lock-in amplifying bulk for the 2-segmented PZT piezoelectric micro-cantilever are designed and facture, which have the advantages in small volume、low weight and convenient trait, etc. The mechanical and electric characters of the piezoelectric micro-cantilever are studied aimed at its application on AFM, including force constant testing、the sensing test under AC actuating voltages、the relationship researching between DC actuating and the force or displacement of the micro-cantilever、resonance frequent testing and the surface simulating under the piezoelectric bimorphs. A simple way to measure and correct micro-displacement of piezoelectric ceramic tube with intended use in AFM is introduced. Nonlinear correction is realized by applying non-equidistant control voltage series while scanning to equidistant pixel. The maximum hysteresis error is largely reduced, and the proposed system can easily adjust the scanning frequency and pixel resolution for the tube.The research indicates that the 2-segment piezoelectric cantilever is feasible in microforce sensing and mirodisplacement detecting. On the base of facturing and testing, perfecting the parameters of the cantilever, it can be used in AFM taking place of traditional cantilever.

节点文献中: 

本文链接的文献网络图示:

本文的引文网络