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(xian)網(wang)絡中光(guang)信號(hao)強(qiang)度、損耗和(he)其他(ta)也關鍵參數的(de)設(she)備。它通過光(guang)源和(he)光(guang)探頭將光(guang)信號(hao)發送和(he)接(jie)收(shou)，并(bing)通過分析收(shou)到的(de)信號(hao)來評估(gu)光(guang)纖(xian)網(wang)絡的(de)性能。

光纖(xian)(xian)(xian)測試儀可(ke)以測量(liang)電(dian)(dian)阻(zu)(zu)(zu)，其原理是通(tong)(tong)過(guo)(guo)光纖(xian)(xian)(xian)技(ji)術將(jiang)被(bei)測電(dian)(dian)阻(zu)(zu)(zu)點點位的(de)(de)電(dian)(dian)信(xin)號轉換(huan)為(wei)光信(xin)號進行傳(chuan)輸，并利用光纖(xian)(xian)(xian)傳(chuan)輸特性測量(liang)電(dian)(dian)阻(zu)(zu)(zu)值(zhi)。具體(ti)來說，光纖(xian)(xian)(xian)測試儀通(tong)(tong)過(guo)(guo)一對(dui)電(dian)(dian)極將(jiang)電(dian)(dian)信(xin)號輸入到(dao)被(bei)測電(dian)(dian)阻(zu)(zu)(zu)上，然(ran)后根據(ju)歐(ou)姆(mu)定(ding)律，電(dian)(dian)流值(zhi)與電(dian)(dian)阻(zu)(zu)(zu)值(zhi)成正比關系，即I=U/R，其中I為(wei)電(dian)(dian)流值(zhi)，U為(wei)為(wei)電(dian)(dian)壓值(zhi)，R為(wei)電(dian)(dian)阻(zu)(zu)(zu)值(zhi)。然(ran)后，通(tong)(tong)過(guo)(guo)測量(liang)電(dian)(dian)流值(zhi)和電(dian)(dian)壓值(zhi)就可(ke)以計算出(chu)電(dian)(dian)阻(zu)(zu)(zu)值(zhi)。主要(yao)(yao)是輸出(chu)固定(ding)的(de)(de)光源信(xin)號，將(jiang)該信(xin)號通(tong)(tong)過(guo)(guo)光纖(xian)(xian)(xian)傳(chuan)輸到(dao)需要(yao)(yao)測試的(de)(de)被(bei)測設備(bei)，并在傳(chuan)輸過(guo)(guo)程中測量(liang)光功率(lv)計接收(shou)到(dao)的(de)(de)光信(xin)號功率(lv)大小。

二、光纖測試儀由什么構成

光纖測試儀是(shi)用于評估光(guang)(guang)纖傳輸性能的設備，主要由光(guang)(guang)源和光(guang)(guang)功率計兩部分組成。

光(guang)(guang)源(yuan)是產生光(guang)(guang)信號的裝置，常(chang)用的光(guang)(guang)源(yuan)有LED光(guang)(guang)源(yuan)、激光(guang)(guang)光(guang)(guang)源(yuan)、白熾燈光(guang)(guang)源(yuan)等(deng)。不(bu)同(tong)的光(guang)(guang)源(yuan)產生的光(guang)(guang)信號波長和功率有所不(bu)同(tong)，根據具體測(ce)試的需求選擇相應(ying)的光(guang)(guang)源(yuan)。

光(guang)功(gong)(gong)率計是(shi)測試光(guang)信號功(gong)(gong)率大小的裝置。它通過(guo)接收被測試設(she)備傳輸過(guo)來的光(guang)信號，并將其轉(zhuan)換(huan)成電信號進行測量，從而評估光(guang)纖傳輸的性能。光(guang)功(gong)(gong)率計常用(yong)的結(jie)構是(shi)PIN衰減(jian)器(qi)結(jie)構，其優(you)點是(shi)反應(ying)時間快，頻寬較高，精度(du)高。