NiTi 形狀記憶合金處于超彈性狀態(tài)時,其電阻與應變成近似線性關(guān)系,利用這一特性將其用作智能結(jié)構(gòu)中的應變傳感元件。本文介紹了SMA 傳感網(wǎng)絡(luò)的微弱信號處理與分析方法及數(shù)據(jù)采集系統(tǒng)。實驗表明研究的信號調(diào)理與放大電路及其信號處理系統(tǒng),能夠?qū)崿F(xiàn)對埋入結(jié)構(gòu)中NiTi 超彈性傳感元件的監(jiān)測,能夠準確判斷沖擊載荷的位置和能量。
關(guān)鍵詞:形狀記憶合金　傳感器　信息處理　數(shù)據(jù)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