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傳(chuan)感器采用壓(ya)阻式應(ying)變(bian)(bian)原理，它(ta)的(de)(de)(de)(de)核心部件(jian)電(dian)(dian)(dian)(dian)阻應(ying)變(bian)(bian)片(pian)(pian)(pian)(pian)(pian)(pian)是一種(zhong)(zhong)將被測件(jian)上的(de)(de)(de)(de)應(ying)變(bian)(bian)變(bian)(bian)化(hua)(hua)轉換(huan)成(cheng)為(wei)一種(zhong)(zhong)電(dian)(dian)(dian)(dian)信號的(de)(de)(de)(de)敏感器件(jian)。它(ta)是傳(chuan)感器的(de)(de)(de)(de)主(zhu)要(yao)組成(cheng)部分之一。電(dian)(dian)(dian)(dian)阻應(ying)變(bian)(bian)片(pian)(pian)(pian)(pian)(pian)(pian)應(ying)用最(zui)多的(de)(de)(de)(de)是金屬(shu)電(dian)(dian)(dian)(dian)阻應(ying)變(bian)(bian)片(pian)(pian)(pian)(pian)(pian)(pian)和(he)半導體(ti)應(ying)變(bian)(bian)片(pian)(pian)(pian)(pian)(pian)(pian)兩(liang)種(zhong)(zhong)。金屬(shu)電(dian)(dian)(dian)(dian)阻應(ying)變(bian)(bian)片(pian)(pian)(pian)(pian)(pian)(pian)又有絲(si)狀應(ying)變(bian)(bian)片(pian)(pian)(pian)(pian)(pian)(pian)和(he)金屬(shu)箔狀應(ying)變(bian)(bian)片(pian)(pian)(pian)(pian)(pian)(pian)兩(liang)種(zhong)(zhong)。通(tong)常(chang)是將應(ying)變(bian)(bian)片(pian)(pian)(pian)(pian)(pian)(pian)通(tong)過特殊的(de)(de)(de)(de)粘和(he)劑緊密的(de)(de)(de)(de)粘合在產生力學應(ying)變(bian)(bian)基體(ti)上，當基體(ti)受(shou)(shou)力發生應(ying)力變(bian)(bian)化(hua)(hua)時(shi)(shi)，電(dian)(dian)(dian)(dian)阻應(ying)變(bian)(bian)片(pian)(pian)(pian)(pian)(pian)(pian)也一起產生形變(bian)(bian)，使(shi)應(ying)變(bian)(bian)片(pian)(pian)(pian)(pian)(pian)(pian)的(de)(de)(de)(de)阻值發生改變(bian)(bian)，從而使(shi)加在電(dian)(dian)(dian)(dian)阻上的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)壓(ya)發生變(bian)(bian)化(hua)(hua)。這種(zhong)(zhong)應(ying)變(bian)(bian)片(pian)(pian)(pian)(pian)(pian)(pian)在受(shou)(shou)力時(shi)(shi)產生的(de)(de)(de)(de)阻值變(bian)(bian)化(hua)(hua)通(tong)常(chang)較小(xiao)，一般這種(zhong)(zhong)應(ying)變(bian)(bian)片(pian)(pian)(pian)(pian)(pian)(pian)都組成(cheng)應(ying)變(bian)(bian)電(dian)(dian)(dian)(dian)橋，從而使(shi)阻抗的(de)(de)(de)(de)變(bian)(bian)化(hua)(hua)轉換(huan)成(cheng)數字信號。