一、光纖測試儀的原理是什么
光纖測試儀是一種(zhong)用于測量(liang)光(guang)(guang)纖網絡(luo)中(zhong)光(guang)(guang)信(xin)號強度、損耗和其他(ta)也關鍵參(can)數(shu)的設備。它通過光(guang)(guang)源和光(guang)(guang)探頭將(jiang)光(guang)(guang)信(xin)號發(fa)送和接收,并(bing)通過分析收到(dao)的信(xin)號來評估光(guang)(guang)纖網絡(luo)的性(xing)能。
光(guang)(guang)纖(xian)測(ce)(ce)(ce)(ce)試儀可以(yi)測(ce)(ce)(ce)(ce)量電(dian)(dian)阻(zu)(zu),其原理是通(tong)過(guo)(guo)(guo)光(guang)(guang)纖(xian)技術(shu)將(jiang)被測(ce)(ce)(ce)(ce)電(dian)(dian)阻(zu)(zu)點點位的電(dian)(dian)信(xin)號(hao)轉換為光(guang)(guang)信(xin)號(hao)進行傳(chuan)(chuan)輸(shu)(shu),并利用光(guang)(guang)纖(xian)傳(chuan)(chuan)輸(shu)(shu)特性測(ce)(ce)(ce)(ce)量電(dian)(dian)阻(zu)(zu)值(zhi)(zhi)。具體來(lai)說,光(guang)(guang)纖(xian)測(ce)(ce)(ce)(ce)試儀通(tong)過(guo)(guo)(guo)一對電(dian)(dian)極將(jiang)電(dian)(dian)信(xin)號(hao)輸(shu)(shu)入到(dao)被測(ce)(ce)(ce)(ce)電(dian)(dian)阻(zu)(zu)上(shang),然后根據歐姆定律,電(dian)(dian)流值(zhi)(zhi)與電(dian)(dian)阻(zu)(zu)值(zhi)(zhi)成正比關系,即I=U/R,其中I為電(dian)(dian)流值(zhi)(zhi),U為為電(dian)(dian)壓(ya)值(zhi)(zhi),R為電(dian)(dian)阻(zu)(zu)值(zhi)(zhi)。然后,通(tong)過(guo)(guo)(guo)測(ce)(ce)(ce)(ce)量電(dian)(dian)流值(zhi)(zhi)和電(dian)(dian)壓(ya)值(zhi)(zhi)就可以(yi)計(ji)算出電(dian)(dian)阻(zu)(zu)值(zhi)(zhi)。主要(yao)是輸(shu)(shu)出固定的光(guang)(guang)源信(xin)號(hao),將(jiang)該信(xin)號(hao)通(tong)過(guo)(guo)(guo)光(guang)(guang)纖(xian)傳(chuan)(chuan)輸(shu)(shu)到(dao)需要(yao)測(ce)(ce)(ce)(ce)試的被測(ce)(ce)(ce)(ce)設備,并在傳(chuan)(chuan)輸(shu)(shu)過(guo)(guo)(guo)程中測(ce)(ce)(ce)(ce)量光(guang)(guang)功率計(ji)接收到(dao)的光(guang)(guang)信(xin)號(hao)功率大小。
二、光纖測試儀由什么構成
光纖測試儀是用于評估光纖傳輸性能的設備,主要由(you)光源和光功(gong)率計(ji)兩部(bu)分(fen)組成。
光(guang)源是產生光(guang)信號的(de)裝置,常用的(de)光(guang)源有(you)(you)LED光(guang)源、激光(guang)光(guang)源、白熾(chi)燈光(guang)源等。不(bu)同的(de)光(guang)源產生的(de)光(guang)信號波長和功率有(you)(you)所不(bu)同,根據具體測(ce)試的(de)需(xu)求(qiu)選擇(ze)相應(ying)的(de)光(guang)源。
光(guang)功(gong)(gong)率計是測(ce)試(shi)光(guang)信(xin)(xin)號(hao)功(gong)(gong)率大小(xiao)的(de)裝(zhuang)置。它(ta)通過接收被測(ce)試(shi)設備傳(chuan)輸過來的(de)光(guang)信(xin)(xin)號(hao),并將其(qi)轉換(huan)成電信(xin)(xin)號(hao)進行測(ce)量(liang),從而評估(gu)光(guang)纖傳(chuan)輸的(de)性能。光(guang)功(gong)(gong)率計常用的(de)結構是PIN衰減器結構,其(qi)優點是反應時間快,頻寬較高(gao),精度(du)高(gao)。