一、光纖測試儀的原理是什么

光纖測試儀是一種用(yong)于測(ce)量光(guang)(guang)纖(xian)網(wang)絡(luo)中(zhong)光(guang)(guang)信號強度(du)、損耗和其他也關鍵(jian)參(can)數的設備。它通(tong)過(guo)光(guang)(guang)源和光(guang)(guang)探頭(tou)將(jiang)光(guang)(guang)信號發送(song)和接收(shou)，并通(tong)過(guo)分析收(shou)到的信號來(lai)評估光(guang)(guang)纖(xian)網(wang)絡(luo)的性能。

光(guang)(guang)纖(xian)(xian)測(ce)試儀可以測(ce)量電(dian)(dian)(dian)阻(zu)，其原理是通過(guo)光(guang)(guang)纖(xian)(xian)技術將被(bei)測(ce)電(dian)(dian)(dian)阻(zu)點點位的(de)電(dian)(dian)(dian)信號轉(zhuan)換為光(guang)(guang)信號進行傳(chuan)輸(shu)(shu)，并利(li)用光(guang)(guang)纖(xian)(xian)傳(chuan)輸(shu)(shu)特性測(ce)量電(dian)(dian)(dian)阻(zu)值(zhi)(zhi)(zhi)。具體來(lai)說，光(guang)(guang)纖(xian)(xian)測(ce)試儀通過(guo)一對電(dian)(dian)(dian)極將電(dian)(dian)(dian)信號輸(shu)(shu)入到(dao)被(bei)測(ce)電(dian)(dian)(dian)阻(zu)上，然后(hou)根據歐(ou)姆定(ding)律，電(dian)(dian)(dian)流(liu)值(zhi)(zhi)(zhi)與電(dian)(dian)(dian)阻(zu)值(zhi)(zhi)(zhi)成正比關(guan)系，即I=U/R，其中(zhong)I為電(dian)(dian)(dian)流(liu)值(zhi)(zhi)(zhi)，U為為電(dian)(dian)(dian)壓(ya)值(zhi)(zhi)(zhi)，R為電(dian)(dian)(dian)阻(zu)值(zhi)(zhi)(zhi)。然后(hou)，通過(guo)測(ce)量電(dian)(dian)(dian)流(liu)值(zhi)(zhi)(zhi)和電(dian)(dian)(dian)壓(ya)值(zhi)(zhi)(zhi)就可以計算出電(dian)(dian)(dian)阻(zu)值(zhi)(zhi)(zhi)。主要是輸(shu)(shu)出固定(ding)的(de)光(guang)(guang)源信號，將該信號通過(guo)光(guang)(guang)纖(xian)(xian)傳(chuan)輸(shu)(shu)到(dao)需要測(ce)試的(de)被(bei)測(ce)設備(bei)，并在傳(chuan)輸(shu)(shu)過(guo)程中(zhong)測(ce)量光(guang)(guang)功率計接收(shou)到(dao)的(de)光(guang)(guang)信號功率大小。

二、光纖測試儀由什么構成

光纖測試儀是(shi)用于評估光纖傳輸(shu)性(xing)能的(de)設備，主要由光源和光功率計(ji)兩部分組成(cheng)。

光(guang)(guang)(guang)(guang)源(yuan)是產(chan)生光(guang)(guang)(guang)(guang)信號的(de)裝置，常用的(de)光(guang)(guang)(guang)(guang)源(yuan)有(you)LED光(guang)(guang)(guang)(guang)源(yuan)、激光(guang)(guang)(guang)(guang)光(guang)(guang)(guang)(guang)源(yuan)、白(bai)熾燈光(guang)(guang)(guang)(guang)源(yuan)等。不同(tong)的(de)光(guang)(guang)(guang)(guang)源(yuan)產(chan)生的(de)光(guang)(guang)(guang)(guang)信號波長(chang)和(he)功(gong)率有(you)所不同(tong)，根據具體測試的(de)需求選擇相應的(de)光(guang)(guang)(guang)(guang)源(yuan)。

光(guang)(guang)(guang)功率計是測(ce)(ce)試光(guang)(guang)(guang)信(xin)號(hao)功率大小的(de)裝(zhuang)置(zhi)。它通(tong)過接收被測(ce)(ce)試設備傳輸過來的(de)光(guang)(guang)(guang)信(xin)號(hao)，并將其(qi)轉換成電信(xin)號(hao)進行(xing)測(ce)(ce)量(liang)，從(cong)而評估(gu)光(guang)(guang)(guang)纖傳輸的(de)性能。光(guang)(guang)(guang)功率計常(chang)用(yong)的(de)結(jie)構是PIN衰減器(qi)結(jie)構，其(qi)優(you)點是反應時間快，頻寬較高(gao)，精度高(gao)。