一、光纖測試儀的原理是什么

光纖測試儀是一種用于(yu)測量光(guang)纖網(wang)絡(luo)中(zhong)光(guang)信號強度(du)、損耗和(he)其他也關鍵參數的設備。它通過(guo)光(guang)源和(he)光(guang)探頭(tou)將光(guang)信號發(fa)送和(he)接(jie)收(shou)，并通過(guo)分析收(shou)到的信號來評估光(guang)纖網(wang)絡(luo)的性能(neng)。

光(guang)(guang)纖(xian)(xian)測試儀可以測量電(dian)(dian)阻(zu)，其原理(li)是通(tong)過光(guang)(guang)纖(xian)(xian)技(ji)術將被測電(dian)(dian)阻(zu)點(dian)點(dian)位的電(dian)(dian)信(xin)(xin)(xin)號(hao)轉換為(wei)光(guang)(guang)信(xin)(xin)(xin)號(hao)進行傳(chuan)(chuan)輸(shu)(shu)，并利用光(guang)(guang)纖(xian)(xian)傳(chuan)(chuan)輸(shu)(shu)特性(xing)測量電(dian)(dian)阻(zu)值(zhi)(zhi)(zhi)(zhi)。具體來說，光(guang)(guang)纖(xian)(xian)測試儀通(tong)過一對(dui)電(dian)(dian)極(ji)將電(dian)(dian)信(xin)(xin)(xin)號(hao)輸(shu)(shu)入到(dao)(dao)被測電(dian)(dian)阻(zu)上，然后根據(ju)歐姆定(ding)律，電(dian)(dian)流(liu)值(zhi)(zhi)(zhi)(zhi)與電(dian)(dian)阻(zu)值(zhi)(zhi)(zhi)(zhi)成正(zheng)比關(guan)系，即I=U/R，其中I為(wei)電(dian)(dian)流(liu)值(zhi)(zhi)(zhi)(zhi)，U為(wei)為(wei)電(dian)(dian)壓(ya)(ya)值(zhi)(zhi)(zhi)(zhi)，R為(wei)電(dian)(dian)阻(zu)值(zhi)(zhi)(zhi)(zhi)。然后，通(tong)過測量電(dian)(dian)流(liu)值(zhi)(zhi)(zhi)(zhi)和電(dian)(dian)壓(ya)(ya)值(zhi)(zhi)(zhi)(zhi)就可以計(ji)算出(chu)電(dian)(dian)阻(zu)值(zhi)(zhi)(zhi)(zhi)。主要是輸(shu)(shu)出(chu)固定(ding)的光(guang)(guang)源信(xin)(xin)(xin)號(hao)，將該信(xin)(xin)(xin)號(hao)通(tong)過光(guang)(guang)纖(xian)(xian)傳(chuan)(chuan)輸(shu)(shu)到(dao)(dao)需要測試的被測設備，并在傳(chuan)(chuan)輸(shu)(shu)過程中測量光(guang)(guang)功(gong)率(lv)計(ji)接收到(dao)(dao)的光(guang)(guang)信(xin)(xin)(xin)號(hao)功(gong)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)纖傳輸性能的設備(bei)，主要由光(guang)源和光(guang)功率計兩部分組成。

光(guang)源(yuan)是(shi)產(chan)生(sheng)光(guang)信號的裝(zhuang)置，常(chang)用的光(guang)源(yuan)有(you)LED光(guang)源(yuan)、激光(guang)光(guang)源(yuan)、白熾燈光(guang)源(yuan)等。不同的光(guang)源(yuan)產(chan)生(sheng)的光(guang)信號波長和(he)功率有(you)所(suo)不同，根據(ju)具體測(ce)試(shi)的需(xu)求選擇相應的光(guang)源(yuan)。

光功率計是測試光信(xin)號(hao)(hao)功率大小的裝置。它通過接收(shou)被測試設備(bei)傳輸(shu)過來的光信(xin)號(hao)(hao)，并將其(qi)轉換成電信(xin)號(hao)(hao)進行(xing)測量，從而評估(gu)光纖傳輸(shu)的性能。光功率計常用的結構是PIN衰減器結構，其(qi)優點是反(fan)應時間快，頻寬較高，精(jing)度高。