彈(dan)性體(彈(dan)性元(yuan)(yuan)件,敏感(gan)梁)在外力(li)作用(yong)下產生(sheng)彈(dan)性變(bian)形,使粘(zhan)貼在他表面的電(dian)阻應變(bian)片(pian)(轉(zhuan)換(huan)元(yuan)(yuan)件)也隨同(tong)產生(sheng)變(bian)形,電(dian)阻應變(bian)片(pian)變(bian)形后,它的阻值將發生(sheng)變(bian)化(hua)(增大或減小),再經過惠斯頓電(dian)橋將這一電(dian)阻變(bian)化(hua)轉(zhuan)換(huan)為(wei)(wei)電(dian)壓信(xin)號,從而完成了將外力(li)變(bian)換(huan)為(wei)(wei)電(dian)信(xin)號的過程。
傳統的模擬式(shi)電(dian)(dian)阻應(ying)變式(shi)傳感器(qi)(qi)就是由電(dian)(dian)阻應(ying)變片、彈性體和惠斯頓橋(qiao)路組成(cheng),后(hou)端(duan)還需要儀表(biao)或者(zhe)變送器(qi)(qi),將電(dian)(dian)壓信號轉換成(cheng)數字量。
目(mu)前(qian)數字(zi)式傳感器在(zai)傳感器內集成(cheng)了A/D轉換,直接(jie)輸出數字(zi)量信號,可直接(jie)供客(ke)戶(hu)使用(yong)。對(dui)于多傳感器稱(cheng)重系統,客(ke)戶(hu)還(huan)需(xu)要進行稱(cheng)重相關的設置,因(yin)此,一般數字(zi)傳感器還(huan)需(xu)要配(pei)合儀表一起(qi)使用(yong)。