一、光纖測試儀的原理是什么

光纖測試儀是一(yi)種(zhong)用(yong)于(yu)測量光(guang)纖網絡中光(guang)信號(hao)強度、損耗和(he)其(qi)他也關(guan)鍵參(can)數的設備。它(ta)通(tong)過光(guang)源和(he)光(guang)探頭將光(guang)信號(hao)發(fa)送(song)和(he)接收(shou)，并通(tong)過分析收(shou)到的信號(hao)來評(ping)估光(guang)纖網絡的性能。

光(guang)纖(xian)(xian)測(ce)試儀可(ke)以測(ce)量(liang)電(dian)(dian)(dian)(dian)阻(zu)(zu)，其原(yuan)理是(shi)通(tong)過光(guang)纖(xian)(xian)技術將(jiang)被(bei)測(ce)電(dian)(dian)(dian)(dian)阻(zu)(zu)點(dian)點(dian)位的電(dian)(dian)(dian)(dian)信(xin)號(hao)(hao)轉換為光(guang)信(xin)號(hao)(hao)進行傳(chuan)輸(shu)，并利用光(guang)纖(xian)(xian)傳(chuan)輸(shu)特性(xing)測(ce)量(liang)電(dian)(dian)(dian)(dian)阻(zu)(zu)值(zhi)(zhi)(zhi)。具體來說，光(guang)纖(xian)(xian)測(ce)試儀通(tong)過一對電(dian)(dian)(dian)(dian)極(ji)將(jiang)電(dian)(dian)(dian)(dian)信(xin)號(hao)(hao)輸(shu)入到(dao)被(bei)測(ce)電(dian)(dian)(dian)(dian)阻(zu)(zu)上，然(ran)后(hou)根據歐姆定(ding)律，電(dian)(dian)(dian)(dian)流(liu)值(zhi)(zhi)(zhi)與電(dian)(dian)(dian)(dian)阻(zu)(zu)值(zhi)(zhi)(zhi)成(cheng)正(zheng)比關系，即I=U/R，其中(zhong)I為電(dian)(dian)(dian)(dian)流(liu)值(zhi)(zhi)(zhi)，U為為電(dian)(dian)(dian)(dian)壓值(zhi)(zhi)(zhi)，R為電(dian)(dian)(dian)(dian)阻(zu)(zu)值(zhi)(zhi)(zhi)。然(ran)后(hou)，通(tong)過測(ce)量(liang)電(dian)(dian)(dian)(dian)流(liu)值(zhi)(zhi)(zhi)和電(dian)(dian)(dian)(dian)壓值(zhi)(zhi)(zhi)就可(ke)以計算出(chu)電(dian)(dian)(dian)(dian)阻(zu)(zu)值(zhi)(zhi)(zhi)。主要是(shi)輸(shu)出(chu)固定(ding)的光(guang)源(yuan)信(xin)號(hao)(hao)，將(jiang)該(gai)信(xin)號(hao)(hao)通(tong)過光(guang)纖(xian)(xian)傳(chuan)輸(shu)到(dao)需要測(ce)試的被(bei)測(ce)設(she)備，并在傳(chuan)輸(shu)過程中(zhong)測(ce)量(liang)光(guang)功率計接收到(dao)的光(guang)信(xin)號(hao)(hao)功率大(da)小(xiao)。

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(shu)性能(neng)的設備(bei)，主要由光源和光功率(lv)計(ji)兩部分組(zu)成。

光(guang)(guang)(guang)源(yuan)(yuan)(yuan)是(shi)產生(sheng)光(guang)(guang)(guang)信號(hao)的裝置，常用的光(guang)(guang)(guang)源(yuan)(yuan)(yuan)有(you)LED光(guang)(guang)(guang)源(yuan)(yuan)(yuan)、激(ji)光(guang)(guang)(guang)光(guang)(guang)(guang)源(yuan)(yuan)(yuan)、白熾燈光(guang)(guang)(guang)源(yuan)(yuan)(yuan)等(deng)。不同的光(guang)(guang)(guang)源(yuan)(yuan)(yuan)產生(sheng)的光(guang)(guang)(guang)信號(hao)波長和功率有(you)所不同，根據(ju)具體測(ce)試的需(xu)求選(xuan)擇相應的光(guang)(guang)(guang)源(yuan)(yuan)(yuan)。

光(guang)功率(lv)計(ji)是測試光(guang)信號功率(lv)大小的裝置。它通過(guo)(guo)接(jie)收被測試設備(bei)傳輸過(guo)(guo)來的光(guang)信號，并將(jiang)其轉換成電信號進行(xing)測量，從而(er)評估光(guang)纖(xian)傳輸的性能。光(guang)功率(lv)計(ji)常用的結(jie)構是PIN衰(shuai)減器(qi)結(jie)構，其優點是反(fan)應時(shi)間快，頻寬較(jiao)高，精度高。