基于FSR的指力检测装置设计  

Design of a FSR-based apparatus for finger force measurement

作　　者：侯文生[1] 马奎[1] 廖彦剑[1] 郑小林[1] 

机构地区：[1]重庆大学生物医学工程系,重庆400044

出　　处：《传感器与微系统》2010年第10期106-109,共4页Transducer and Microsystem Technologies

基　　金：国家自然科学基金资助项目(NSFC;30770546;30970758);重庆市自然科学基金资助项目(2006BB2043;2007BB5148)

摘　　要：针对脑磁图、磁共振等测试环境的特殊要求，设计了基于力敏电阻器（FSR）的指力检测装置。在该装置中，利用聚碳酸酯材料设计了将指力转换为FSR电阻改变的机械装置，通过恒流源电路将FSR电阻变化转换为电压信号，以USB6008和LabVIEW实现了数据的实时采集和显示，并对整个装置进行了静态标定和动态特性测试。测试结果表明：输出电压和施加压力近似呈指数关系；在0—15N的静态测试范围内，输出力量与实际压力的绝对误差小于0．5N，相对误差小于10％；在0-25N的动态测试范围内，绝对误差主要集中在0-2N，相对误差主要集中分布在2％-8％。装置具有较好的静态和动态特性，可用于脑磁图、磁共振等环境下指力实验。To meet the finger force measurement in the experiment of magnetoencephalography （MEG） or magnetic resonance imaging（ MRI）, a force sensor resistor（FSR）-based finger force detection apparatus was designed. A custom-made polycarbonate substrate was used to transfer finger force to the deformation of FSR cell mechanically, and a constant-current source circuit was adopted to transduce the resistance changes of FSR into voltage signal. USB6008 interface card and LabVIEW were combined to acquire and display the digitized finger force signal in real-time. The apparatus was tested and characterized in static and dynamic conditions. The experiment results revealed that the relationship between pressure and output voltage approximated an exponential curve. Within the range of 0 -15 N, the absolute error was less than 0.5 N and the relative error was less than 10 %, respectively; the absolute error and relative error in the dynamic testing mainly ranged of 0-2 N and 2 % -8 % respectively. The testing results indicated that our proposed finger force detection apparatus had good performance in both static and dynamic conditions, and could meet the requirements of finger force detection in MEG or MRI experiment

关 键 词：力敏电阻器 传感器 LABVIEW 指力 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]