鎧裝(zhuang)熱(re)(re)(re)電(dian)(dian)(dian)(dian)偶(ou)是(shi)(shi)溫(wen)度測量(liang)中(zhong)(zhong)應用(yong)*泛(fan)的(de)(de)溫(wen)度器件，他(ta)的(de)(de)主要特(te)點就(jiu)(jiu)是(shi)(shi)測吻范圍寬，性能(neng)比(bi)較(jiao)穩定(ding)，同(tong)時(shi)結構(gou)簡單，動(dong)態響應好(hao)，更能(neng)夠遠傳4-20mA電(dian)(dian)(dian)(dian)信(xin)號，便(bian)于(yu)自動(dong)控(kong)制和集中(zhong)(zhong)控(kong)制。熱(re)(re)(re)電(dian)(dian)(dian)(dian)偶(ou)的(de)(de)測溫(wen)原理是(shi)(shi)基(ji)于(yu)熱(re)(re)(re)電(dian)(dian)(dian)(dian)效(xiao)應。將(jiang)兩(liang)(liang)種(zhong)不同(tong)的(de)(de)導(dao)(dao)體(ti)或半導(dao)(dao)體(ti)連接(jie)(jie)成閉(bi)合回路(lu)(lu)，當兩(liang)(liang)個接(jie)(jie)點處(chu)的(de)(de)溫(wen)度不同(tong)時(shi)，回路(lu)(lu)中(zhong)(zhong)將(jiang)產(chan)(chan)生(sheng)熱(re)(re)(re)電(dian)(dian)(dian)(dian)勢(shi)(shi)，這(zhe)種(zhong)現象稱為熱(re)(re)(re)電(dian)(dian)(dian)(dian)效(xiao)應，又稱為塞貝克效(xiao)應。閉(bi)合回路(lu)(lu)中(zhong)(zhong)產(chan)(chan)生(sheng)的(de)(de)熱(re)(re)(re)電(dian)(dian)(dian)(dian)勢(shi)(shi)有(you)兩(liang)(liang)種(zhong)電(dian)(dian)(dian)(dian)勢(shi)(shi)組成；溫(wen)差電(dian)(dian)(dian)(dian)勢(shi)(shi)和接(jie)(jie)觸電(dian)(dian)(dian)(dian)勢(shi)(shi)。溫(wen)差電(dian)(dian)(dian)(dian)勢(shi)(shi)是(shi)(shi)指同(tong)一(yi)導(dao)(dao)體(ti)的(de)(de)兩(liang)(liang)端因溫(wen)度不同(tong)而產(chan)(chan)生(sheng)的(de)(de)電(dian)(dian)(dian)(dian)勢(shi)(shi)，不同(tong)的(de)(de)導(dao)(dao)體(ti)具有(you)不同(tong)的(de)(de)電(dian)(dian)(dian)(dian)子(zi)密度，所(suo)(suo)以他(ta)們產(chan)(chan)生(sheng)的(de)(de)電(dian)(dian)(dian)(dian)勢(shi)(shi)也不相(xiang)同(tong)，而接(jie)(jie)觸電(dian)(dian)(dian)(dian)勢(shi)(shi)顧名(ming)思義(yi)就(jiu)(jiu)是(shi)(shi)指兩(liang)(liang)種(zhong)不同(tong)的(de)(de)導(dao)(dao)體(ti)相(xiang)接(jie)(jie)觸時(shi)，因為他(ta)們的(de)(de)電(dian)(dian)(dian)(dian)子(zi)密度不同(tong)所(suo)(suo)以產(chan)(chan)生(sheng)一(yi)定(ding)的(de)(de)電(dian)(dian)(dian)(dian)子(zi)擴散，當他(ta)們達到一(yi)定(ding)的(de)(de)平衡后所(suo)(suo)形(xing)成的(de)(de)電(dian)(dian)(dian)(dian)勢(shi)(shi)，接(jie)(jie)觸電(dian)(dian)(dian)(dian)勢(shi)(shi)的(de)(de)大小取決于(yu)兩(liang)(liang)種(zhong)不同(tong)導(dao)(dao)體(ti)的(de)(de)材料性質以及他(ta)們接(jie)(jie)觸點的(de)(de)溫(wen)度。