一、光纖測試儀的原理是什么

光纖測試儀是一種用于測量光(guang)纖網絡中光(guang)信(xin)號(hao)強度、損耗和其他也關鍵參數的設備(bei)。它通過(guo)光(guang)源和光(guang)探頭將(jiang)光(guang)信(xin)號(hao)發送和接收(shou)，并通過(guo)分析(xi)收(shou)到的信(xin)號(hao)來評估光(guang)纖網絡的性能。

光(guang)纖(xian)(xian)測(ce)(ce)試儀可以測(ce)(ce)量(liang)電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)，其(qi)原(yuan)理是(shi)通(tong)過(guo)(guo)光(guang)纖(xian)(xian)技術將(jiang)被(bei)測(ce)(ce)電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)點點位的(de)電(dian)(dian)(dian)(dian)(dian)信(xin)(xin)號(hao)轉換為(wei)光(guang)信(xin)(xin)號(hao)進行(xing)傳(chuan)輸(shu)(shu)，并利用(yong)光(guang)纖(xian)(xian)傳(chuan)輸(shu)(shu)特性測(ce)(ce)量(liang)電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)值(zhi)(zhi)(zhi)。具體(ti)來說，光(guang)纖(xian)(xian)測(ce)(ce)試儀通(tong)過(guo)(guo)一對電(dian)(dian)(dian)(dian)(dian)極將(jiang)電(dian)(dian)(dian)(dian)(dian)信(xin)(xin)號(hao)輸(shu)(shu)入到被(bei)測(ce)(ce)電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)上，然(ran)后(hou)根(gen)據歐姆定律，電(dian)(dian)(dian)(dian)(dian)流值(zhi)(zhi)(zhi)與電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)值(zhi)(zhi)(zhi)成正比關系，即(ji)I=U/R，其(qi)中I為(wei)電(dian)(dian)(dian)(dian)(dian)流值(zhi)(zhi)(zhi)，U為(wei)為(wei)電(dian)(dian)(dian)(dian)(dian)壓值(zhi)(zhi)(zhi)，R為(wei)電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)值(zhi)(zhi)(zhi)。然(ran)后(hou)，通(tong)過(guo)(guo)測(ce)(ce)量(liang)電(dian)(dian)(dian)(dian)(dian)流值(zhi)(zhi)(zhi)和電(dian)(dian)(dian)(dian)(dian)壓值(zhi)(zhi)(zhi)就(jiu)可以計算出電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)值(zhi)(zhi)(zhi)。主要是(shi)輸(shu)(shu)出固定的(de)光(guang)源信(xin)(xin)號(hao)，將(jiang)該(gai)信(xin)(xin)號(hao)通(tong)過(guo)(guo)光(guang)纖(xian)(xian)傳(chuan)輸(shu)(shu)到需要測(ce)(ce)試的(de)被(bei)測(ce)(ce)設(she)備，并在傳(chuan)輸(shu)(shu)過(guo)(guo)程中測(ce)(ce)量(liang)光(guang)功(gong)率計接收(shou)到的(de)光(guang)信(xin)(xin)號(hao)功(gong)率大小。

二、光纖測試儀由什么構成

光纖測試儀是用于(yu)評估光纖傳輸性能的設備，主要由光源和光功(gong)率(lv)計兩部分組(zu)成(cheng)。

光(guang)(guang)(guang)源(yuan)(yuan)(yuan)(yuan)是產生光(guang)(guang)(guang)信(xin)號(hao)的(de)(de)裝置，常用的(de)(de)光(guang)(guang)(guang)源(yuan)(yuan)(yuan)(yuan)有LED光(guang)(guang)(guang)源(yuan)(yuan)(yuan)(yuan)、激光(guang)(guang)(guang)光(guang)(guang)(guang)源(yuan)(yuan)(yuan)(yuan)、白熾燈(deng)光(guang)(guang)(guang)源(yuan)(yuan)(yuan)(yuan)等。不同的(de)(de)光(guang)(guang)(guang)源(yuan)(yuan)(yuan)(yuan)產生的(de)(de)光(guang)(guang)(guang)信(xin)號(hao)波長和功(gong)率有所(suo)不同，根據具體測試的(de)(de)需求選擇相應的(de)(de)光(guang)(guang)(guang)源(yuan)(yuan)(yuan)(yuan)。

光(guang)功(gong)率計(ji)是(shi)(shi)測試光(guang)信號功(gong)率大(da)小的(de)(de)裝(zhuang)置。它通過(guo)接收被測試設備傳輸過(guo)來的(de)(de)光(guang)信號，并將其(qi)轉換成電信號進(jin)行測量，從而評估光(guang)纖傳輸的(de)(de)性能。光(guang)功(gong)率計(ji)常(chang)用的(de)(de)結(jie)構是(shi)(shi)PIN衰(shuai)減器結(jie)構，其(qi)優點是(shi)(shi)反應時(shi)間快，頻(pin)寬較高(gao)，精度高(gao)。