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)號強度、損耗和(he)其(qi)他也關(guan)鍵參數(shu)的設備。它通過(guo)(guo)光(guang)源(yuan)和(he)光(guang)探頭將光(guang)信(xin)號發送(song)和(he)接收(shou)，并通過(guo)(guo)分析收(shou)到(dao)的信(xin)號來評(ping)估光(guang)纖網絡的性能。

光(guang)(guang)纖測(ce)試儀(yi)可以測(ce)量(liang)電(dian)(dian)(dian)阻，其原(yuan)理是通(tong)過光(guang)(guang)纖技(ji)術(shu)將被測(ce)電(dian)(dian)(dian)阻點點位(wei)的電(dian)(dian)(dian)信(xin)號(hao)轉換(huan)為(wei)(wei)光(guang)(guang)信(xin)號(hao)進行傳輸(shu)，并利用光(guang)(guang)纖傳輸(shu)特(te)性測(ce)量(liang)電(dian)(dian)(dian)阻值(zhi)。具體(ti)來說，光(guang)(guang)纖測(ce)試儀(yi)通(tong)過一對電(dian)(dian)(dian)極將電(dian)(dian)(dian)信(xin)號(hao)輸(shu)入到被測(ce)電(dian)(dian)(dian)阻上，然后根(gen)據歐(ou)姆定律，電(dian)(dian)(dian)流(liu)(liu)值(zhi)與電(dian)(dian)(dian)阻值(zhi)成正比關(guan)系(xi)，即I=U/R，其中I為(wei)(wei)電(dian)(dian)(dian)流(liu)(liu)值(zhi)，U為(wei)(wei)為(wei)(wei)電(dian)(dian)(dian)壓(ya)值(zhi)，R為(wei)(wei)電(dian)(dian)(dian)阻值(zhi)。然后，通(tong)過測(ce)量(liang)電(dian)(dian)(dian)流(liu)(liu)值(zhi)和(he)電(dian)(dian)(dian)壓(ya)值(zhi)就可以計算出(chu)電(dian)(dian)(dian)阻值(zhi)。主要(yao)是輸(shu)出(chu)固(gu)定的光(guang)(guang)源(yuan)信(xin)號(hao)，將該信(xin)號(hao)通(tong)過光(guang)(guang)纖傳輸(shu)到需要(yao)測(ce)試的被測(ce)設備，并在傳輸(shu)過程中測(ce)量(liang)光(guang)(guang)功(gong)率(lv)計接收到的光(guang)(guang)信(xin)號(hao)功(gong)率(lv)大(da)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)纖傳輸性能的(de)設備，主要(yao)由光(guang)源和光(guang)功率計兩部分組成。

光(guang)(guang)(guang)(guang)(guang)源(yuan)(yuan)是(shi)產(chan)生光(guang)(guang)(guang)(guang)(guang)信(xin)號的裝(zhuang)置(zhi)，常用的光(guang)(guang)(guang)(guang)(guang)源(yuan)(yuan)有LED光(guang)(guang)(guang)(guang)(guang)源(yuan)(yuan)、激光(guang)(guang)(guang)(guang)(guang)光(guang)(guang)(guang)(guang)(guang)源(yuan)(yuan)、白熾燈光(guang)(guang)(guang)(guang)(guang)源(yuan)(yuan)等(deng)。不同的光(guang)(guang)(guang)(guang)(guang)源(yuan)(yuan)產(chan)生的光(guang)(guang)(guang)(guang)(guang)信(xin)號波長和功(gong)率有所(suo)不同，根據具體測(ce)試的需求選(xuan)擇相應的光(guang)(guang)(guang)(guang)(guang)源(yuan)(yuan)。

光(guang)(guang)(guang)功率計是測試(shi)光(guang)(guang)(guang)信(xin)號功率大小的裝置(zhi)。它(ta)通過(guo)接收被測試(shi)設備傳(chuan)輸(shu)過(guo)來的光(guang)(guang)(guang)信(xin)號，并(bing)將其轉(zhuan)換成(cheng)電信(xin)號進行測量(liang)，從而評估光(guang)(guang)(guang)纖傳(chuan)輸(shu)的性能。光(guang)(guang)(guang)功率計常用的結構是PIN衰減器結構，其優點(dian)是反(fan)應時間快，頻(pin)寬較高(gao)，精度高(gao)。