NiTi 形狀記憶合金處于超彈性狀態時,其電阻與應變成近似線性關系,利用這一特性將其用作智能結構中的應變傳感元件。本文介紹了SMA 傳感網絡的微弱信號處理與分析方法及數據采集系統。實驗表明研究的信號調理與放大電路及其信號處理系統,能夠實現對埋入結構中NiTi 超彈性傳感元件的監測,能夠準確判斷沖擊載荷的位置和能量。
關鍵詞:形狀記憶合金　傳感器　信息處理　數據采集
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