一、光纖測試儀的原理是什么

光纖測試儀是一種(zhong)用于(yu)測(ce)量光(guang)(guang)纖網(wang)(wang)絡中光(guang)(guang)信(xin)號強度、損耗和其他也關鍵參數的設(she)備。它通(tong)過(guo)光(guang)(guang)源(yuan)和光(guang)(guang)探頭將光(guang)(guang)信(xin)號發送和接收(shou)，并通(tong)過(guo)分析收(shou)到的信(xin)號來評估光(guang)(guang)纖網(wang)(wang)絡的性能。

光(guang)(guang)(guang)(guang)纖測(ce)(ce)(ce)試(shi)(shi)(shi)儀可(ke)以測(ce)(ce)(ce)量(liang)電(dian)(dian)(dian)阻(zu)(zu)(zu)(zu)，其原理是通過光(guang)(guang)(guang)(guang)纖技(ji)術將(jiang)被測(ce)(ce)(ce)電(dian)(dian)(dian)阻(zu)(zu)(zu)(zu)點點位的(de)(de)電(dian)(dian)(dian)信號(hao)(hao)轉換為(wei)光(guang)(guang)(guang)(guang)信號(hao)(hao)進行(xing)傳輸(shu)(shu)，并(bing)(bing)利(li)用(yong)光(guang)(guang)(guang)(guang)纖傳輸(shu)(shu)特性測(ce)(ce)(ce)量(liang)電(dian)(dian)(dian)阻(zu)(zu)(zu)(zu)值(zhi)(zhi)(zhi)。具(ju)體(ti)來說(shuo)，光(guang)(guang)(guang)(guang)纖測(ce)(ce)(ce)試(shi)(shi)(shi)儀通過一對電(dian)(dian)(dian)極將(jiang)電(dian)(dian)(dian)信號(hao)(hao)輸(shu)(shu)入到(dao)(dao)被測(ce)(ce)(ce)電(dian)(dian)(dian)阻(zu)(zu)(zu)(zu)上，然后根據(ju)歐姆(mu)定律(lv)，電(dian)(dian)(dian)流(liu)值(zhi)(zhi)(zhi)與電(dian)(dian)(dian)阻(zu)(zu)(zu)(zu)值(zhi)(zhi)(zhi)成正比關系，即(ji)I=U/R，其中(zhong)I為(wei)電(dian)(dian)(dian)流(liu)值(zhi)(zhi)(zhi)，U為(wei)為(wei)電(dian)(dian)(dian)壓(ya)值(zhi)(zhi)(zhi)，R為(wei)電(dian)(dian)(dian)阻(zu)(zu)(zu)(zu)值(zhi)(zhi)(zhi)。然后，通過測(ce)(ce)(ce)量(liang)電(dian)(dian)(dian)流(liu)值(zhi)(zhi)(zhi)和電(dian)(dian)(dian)壓(ya)值(zhi)(zhi)(zhi)就(jiu)可(ke)以計(ji)算出(chu)電(dian)(dian)(dian)阻(zu)(zu)(zu)(zu)值(zhi)(zhi)(zhi)。主要(yao)是輸(shu)(shu)出(chu)固定的(de)(de)光(guang)(guang)(guang)(guang)源信號(hao)(hao)，將(jiang)該(gai)信號(hao)(hao)通過光(guang)(guang)(guang)(guang)纖傳輸(shu)(shu)到(dao)(dao)需(xu)要(yao)測(ce)(ce)(ce)試(shi)(shi)(shi)的(de)(de)被測(ce)(ce)(ce)設備，并(bing)(bing)在傳輸(shu)(shu)過程中(zhong)測(ce)(ce)(ce)量(liang)光(guang)(guang)(guang)(guang)功率計(ji)接收到(dao)(dao)的(de)(de)光(guang)(guang)(guang)(guang)信號(hao)(hao)功率大小。

二、光纖測試儀由什么構成

光纖測試儀是用于(yu)評估(gu)光纖(xian)傳(chuan)輸性(xing)能的設備(bei)，主要(yao)由光源和光功(gong)率計兩(liang)部(bu)分組成。

光源(yuan)(yuan)是產生(sheng)光信(xin)號的(de)(de)(de)(de)裝置(zhi)，常用的(de)(de)(de)(de)光源(yuan)(yuan)有(you)LED光源(yuan)(yuan)、激(ji)光光源(yuan)(yuan)、白熾燈(deng)光源(yuan)(yuan)等。不(bu)同(tong)的(de)(de)(de)(de)光源(yuan)(yuan)產生(sheng)的(de)(de)(de)(de)光信(xin)號波長和功率有(you)所(suo)不(bu)同(tong)，根據具體測試的(de)(de)(de)(de)需求(qiu)選擇相應的(de)(de)(de)(de)光源(yuan)(yuan)。

光(guang)功(gong)率(lv)計是測(ce)試光(guang)信(xin)號(hao)功(gong)率(lv)大小的裝(zhuang)置(zhi)。它通(tong)過接收被測(ce)試設備傳輸(shu)過來的光(guang)信(xin)號(hao)，并(bing)將其轉換成(cheng)電信(xin)號(hao)進行(xing)測(ce)量，從而評估光(guang)纖傳輸(shu)的性能。光(guang)功(gong)率(lv)計常用的結構是PIN衰減器結構，其優點(dian)是反應時間快，頻寬較高，精度(du)高。