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(wang)絡(luo)中(zhong)光(guang)信(xin)號(hao)強度、損耗(hao)和其他也關(guan)鍵參數(shu)的設備(bei)。它(ta)通(tong)過光(guang)源和光(guang)探頭將光(guang)信(xin)號(hao)發(fa)送和接收，并通(tong)過分析(xi)收到的信(xin)號(hao)來評估光(guang)纖網(wang)絡(luo)的性能。

光(guang)纖(xian)測(ce)(ce)試儀(yi)可以(yi)測(ce)(ce)量(liang)電(dian)(dian)(dian)阻(zu)，其原理是通過(guo)光(guang)纖(xian)技術將(jiang)被測(ce)(ce)電(dian)(dian)(dian)阻(zu)點點位(wei)的(de)電(dian)(dian)(dian)信號(hao)(hao)轉換(huan)為(wei)光(guang)信號(hao)(hao)進行(xing)傳輸(shu)(shu)，并利用光(guang)纖(xian)傳輸(shu)(shu)特性測(ce)(ce)量(liang)電(dian)(dian)(dian)阻(zu)值。具體來說，光(guang)纖(xian)測(ce)(ce)試儀(yi)通過(guo)一對電(dian)(dian)(dian)極將(jiang)電(dian)(dian)(dian)信號(hao)(hao)輸(shu)(shu)入到(dao)被測(ce)(ce)電(dian)(dian)(dian)阻(zu)上，然后根據歐姆定(ding)(ding)律，電(dian)(dian)(dian)流(liu)值與電(dian)(dian)(dian)阻(zu)值成正比關(guan)系，即I=U/R，其中I為(wei)電(dian)(dian)(dian)流(liu)值，U為(wei)為(wei)電(dian)(dian)(dian)壓值，R為(wei)電(dian)(dian)(dian)阻(zu)值。然后，通過(guo)測(ce)(ce)量(liang)電(dian)(dian)(dian)流(liu)值和電(dian)(dian)(dian)壓值就可以(yi)計(ji)算出電(dian)(dian)(dian)阻(zu)值。主(zhu)要(yao)(yao)是輸(shu)(shu)出固定(ding)(ding)的(de)光(guang)源信號(hao)(hao)，將(jiang)該信號(hao)(hao)通過(guo)光(guang)纖(xian)傳輸(shu)(shu)到(dao)需(xu)要(yao)(yao)測(ce)(ce)試的(de)被測(ce)(ce)設備，并在傳輸(shu)(shu)過(guo)程(cheng)中測(ce)(ce)量(liang)光(guang)功率計(ji)接(jie)收到(dao)的(de)光(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(shi)用于(yu)評(ping)估光纖傳(chuan)輸性能(neng)的(de)設備，主要由光源和光功率(lv)計兩部分組成。

光(guang)(guang)(guang)源(yuan)(yuan)(yuan)(yuan)(yuan)是(shi)產生光(guang)(guang)(guang)信(xin)號(hao)的裝(zhuang)置(zhi)，常用的光(guang)(guang)(guang)源(yuan)(yuan)(yuan)(yuan)(yuan)有LED光(guang)(guang)(guang)源(yuan)(yuan)(yuan)(yuan)(yuan)、激光(guang)(guang)(guang)光(guang)(guang)(guang)源(yuan)(yuan)(yuan)(yuan)(yuan)、白熾燈光(guang)(guang)(guang)源(yuan)(yuan)(yuan)(yuan)(yuan)等。不同(tong)的光(guang)(guang)(guang)源(yuan)(yuan)(yuan)(yuan)(yuan)產生的光(guang)(guang)(guang)信(xin)號(hao)波(bo)長和功率有所不同(tong)，根據具體測試(shi)的需求(qiu)選擇相應(ying)的光(guang)(guang)(guang)源(yuan)(yuan)(yuan)(yuan)(yuan)。

光(guang)功率(lv)計是測(ce)(ce)試光(guang)信(xin)(xin)(xin)號功率(lv)大小的裝置。它(ta)通過(guo)接收被測(ce)(ce)試設備傳輸過(guo)來(lai)的光(guang)信(xin)(xin)(xin)號，并將其轉換成電信(xin)(xin)(xin)號進行測(ce)(ce)量，從而評估(gu)光(guang)纖傳輸的性能。光(guang)功率(lv)計常用的結構是PIN衰減(jian)器(qi)結構，其優點(dian)是反應(ying)時間快，頻(pin)寬較高(gao)，精度高(gao)。