SMA传感特性及其信号处理

NiTi 形状记忆合金处于超弹性状态时,其电阻与应变成近似线性关系,利用这一特性将其用作智能结构中的应变传感元件。本文介绍了SMA 传感网络的微弱信号处理与分析方法及数据采集系统。实验表明研究的信号调理与放大电路及其信号处理系统,能够实现对埋入结构中NiTi 超弹性传感元件的监测,能够准确判断冲击载荷的位置和能量。
关键词:形状记忆合金　传感器　信息处理　数据采集
Abstract : The relationship between resistance and st rain of NiTi superelelastic wire during
loading and unloading conditions is nearly linear , it can been used as st rain - sensing t ransducer cell in smart st ructures1 The weak signal processing and analyzing methods of the SMA sensing net are int roduced1 Experimental result s show that the signal conditioner and amplifier and singal process system can successfully monitor the output s by embedded superelastic wires in composite st ructures and accurately judge the position and energy of impact loading1
Keywords :Shape memory alloy (SMA) , sensor , signal processing , data acquisition1