一、光纖測試儀的原理是什么

光纖測試儀是一種用于(yu)測量光纖網(wang)絡中(zhong)光信(xin)號強度、損(sun)耗和其他也關(guan)鍵參數(shu)的(de)(de)設備。它通過(guo)光源和光探頭將光信(xin)號發送(song)和接收，并(bing)通過(guo)分析收到(dao)的(de)(de)信(xin)號來(lai)評估光纖網(wang)絡的(de)(de)性能。

光(guang)(guang)(guang)(guang)纖(xian)測(ce)(ce)試儀可以(yi)測(ce)(ce)量電(dian)(dian)(dian)(dian)阻(zu)(zu)，其原(yuan)理是通過光(guang)(guang)(guang)(guang)纖(xian)技術(shu)將(jiang)被(bei)測(ce)(ce)電(dian)(dian)(dian)(dian)阻(zu)(zu)點(dian)點(dian)位的(de)電(dian)(dian)(dian)(dian)信(xin)(xin)號轉換為光(guang)(guang)(guang)(guang)信(xin)(xin)號進(jin)行傳輸(shu)(shu)(shu)，并利用光(guang)(guang)(guang)(guang)纖(xian)傳輸(shu)(shu)(shu)特性測(ce)(ce)量電(dian)(dian)(dian)(dian)阻(zu)(zu)值。具體來說，光(guang)(guang)(guang)(guang)纖(xian)測(ce)(ce)試儀通過一(yi)對電(dian)(dian)(dian)(dian)極將(jiang)電(dian)(dian)(dian)(dian)信(xin)(xin)號輸(shu)(shu)(shu)入到被(bei)測(ce)(ce)電(dian)(dian)(dian)(dian)阻(zu)(zu)上，然(ran)后根據歐(ou)姆定律，電(dian)(dian)(dian)(dian)流(liu)(liu)值與電(dian)(dian)(dian)(dian)阻(zu)(zu)值成正(zheng)比關(guan)系，即(ji)I=U/R，其中(zhong)I為電(dian)(dian)(dian)(dian)流(liu)(liu)值，U為為電(dian)(dian)(dian)(dian)壓值，R為電(dian)(dian)(dian)(dian)阻(zu)(zu)值。然(ran)后，通過測(ce)(ce)量電(dian)(dian)(dian)(dian)流(liu)(liu)值和電(dian)(dian)(dian)(dian)壓值就(jiu)可以(yi)計(ji)算出電(dian)(dian)(dian)(dian)阻(zu)(zu)值。主要是輸(shu)(shu)(shu)出固(gu)定的(de)光(guang)(guang)(guang)(guang)源信(xin)(xin)號，將(jiang)該信(xin)(xin)號通過光(guang)(guang)(guang)(guang)纖(xian)傳輸(shu)(shu)(shu)到需要測(ce)(ce)試的(de)被(bei)測(ce)(ce)設(she)備，并在傳輸(shu)(shu)(shu)過程(cheng)中(zhong)測(ce)(ce)量光(guang)(guang)(guang)(guang)功(gong)率(lv)(lv)計(ji)接收到的(de)光(guang)(guang)(guang)(guang)信(xin)(xin)號功(gong)率(lv)(lv)大小(xiao)。

二、光纖測試儀由什么構成

光纖測試儀是用于評估光(guang)纖傳(chuan)輸性能的設備，主要(yao)由光(guang)源和光(guang)功(gong)率(lv)計兩部(bu)分組成。

光(guang)(guang)(guang)(guang)(guang)源(yuan)(yuan)是產(chan)生光(guang)(guang)(guang)(guang)(guang)信號的(de)裝置(zhi)，常用的(de)光(guang)(guang)(guang)(guang)(guang)源(yuan)(yuan)有LED光(guang)(guang)(guang)(guang)(guang)源(yuan)(yuan)、激(ji)光(guang)(guang)(guang)(guang)(guang)光(guang)(guang)(guang)(guang)(guang)源(yuan)(yuan)、白熾(chi)燈光(guang)(guang)(guang)(guang)(guang)源(yuan)(yuan)等。不同(tong)的(de)光(guang)(guang)(guang)(guang)(guang)源(yuan)(yuan)產(chan)生的(de)光(guang)(guang)(guang)(guang)(guang)信號波(bo)長和功率有所不同(tong)，根(gen)據具體測(ce)試的(de)需(xu)求(qiu)選(xuan)擇相應的(de)光(guang)(guang)(guang)(guang)(guang)源(yuan)(yuan)。

光(guang)(guang)功率(lv)計是(shi)測(ce)(ce)試光(guang)(guang)信號(hao)(hao)功率(lv)大(da)小的裝(zhuang)置。它(ta)通過(guo)接收被測(ce)(ce)試設(she)備傳(chuan)輸(shu)(shu)過(guo)來的光(guang)(guang)信號(hao)(hao)，并將其轉換(huan)成電信號(hao)(hao)進(jin)行測(ce)(ce)量，從而評估光(guang)(guang)纖(xian)傳(chuan)輸(shu)(shu)的性能。光(guang)(guang)功率(lv)計常用(yong)的結(jie)構是(shi)PIN衰減器結(jie)構，其優(you)點(dian)是(shi)反應時(shi)間快，頻(pin)寬較高(gao)，精(jing)度高(gao)。