一、光纖測試儀的原理是什么

光纖測試儀是一種(zhong)用于測量光(guang)纖(xian)網絡(luo)中(zhong)光(guang)信(xin)號強度(du)、損耗和(he)其他也關鍵參數的(de)設備。它通過光(guang)源和(he)光(guang)探頭將光(guang)信(xin)號發送和(he)接收(shou)，并通過分析收(shou)到的(de)信(xin)號來評(ping)估光(guang)纖(xian)網絡(luo)的(de)性能(neng)。

光(guang)(guang)(guang)纖(xian)測(ce)(ce)(ce)(ce)(ce)試儀可以測(ce)(ce)(ce)(ce)(ce)量電(dian)(dian)(dian)阻(zu)(zu)(zu)，其(qi)原理(li)是(shi)通(tong)過(guo)光(guang)(guang)(guang)纖(xian)技術將被(bei)測(ce)(ce)(ce)(ce)(ce)電(dian)(dian)(dian)阻(zu)(zu)(zu)點點位的(de)電(dian)(dian)(dian)信(xin)(xin)(xin)號轉換為(wei)光(guang)(guang)(guang)信(xin)(xin)(xin)號進行(xing)傳(chuan)輸(shu)(shu)(shu)，并利用(yong)光(guang)(guang)(guang)纖(xian)傳(chuan)輸(shu)(shu)(shu)特性(xing)測(ce)(ce)(ce)(ce)(ce)量電(dian)(dian)(dian)阻(zu)(zu)(zu)值(zhi)(zhi)。具體來說，光(guang)(guang)(guang)纖(xian)測(ce)(ce)(ce)(ce)(ce)試儀通(tong)過(guo)一對電(dian)(dian)(dian)極將電(dian)(dian)(dian)信(xin)(xin)(xin)號輸(shu)(shu)(shu)入到被(bei)測(ce)(ce)(ce)(ce)(ce)電(dian)(dian)(dian)阻(zu)(zu)(zu)上，然后根據歐(ou)姆定律，電(dian)(dian)(dian)流(liu)值(zhi)(zhi)與(yu)電(dian)(dian)(dian)阻(zu)(zu)(zu)值(zhi)(zhi)成正(zheng)比關系，即(ji)I=U/R，其(qi)中(zhong)I為(wei)電(dian)(dian)(dian)流(liu)值(zhi)(zhi)，U為(wei)為(wei)電(dian)(dian)(dian)壓(ya)值(zhi)(zhi)，R為(wei)電(dian)(dian)(dian)阻(zu)(zu)(zu)值(zhi)(zhi)。然后，通(tong)過(guo)測(ce)(ce)(ce)(ce)(ce)量電(dian)(dian)(dian)流(liu)值(zhi)(zhi)和電(dian)(dian)(dian)壓(ya)值(zhi)(zhi)就(jiu)可以計算(suan)出電(dian)(dian)(dian)阻(zu)(zu)(zu)值(zhi)(zhi)。主要是(shi)輸(shu)(shu)(shu)出固定的(de)光(guang)(guang)(guang)源(yuan)信(xin)(xin)(xin)號，將該信(xin)(xin)(xin)號通(tong)過(guo)光(guang)(guang)(guang)纖(xian)傳(chuan)輸(shu)(shu)(shu)到需要測(ce)(ce)(ce)(ce)(ce)試的(de)被(bei)測(ce)(ce)(ce)(ce)(ce)設(she)備，并在(zai)傳(chuan)輸(shu)(shu)(shu)過(guo)程(cheng)中(zhong)測(ce)(ce)(ce)(ce)(ce)量光(guang)(guang)(guang)功(gong)(gong)率計接收到的(de)光(guang)(guang)(guang)信(xin)(xin)(xin)號功(gong)(gong)率大小。

二、光纖測試儀由什么構成

光纖測試儀是用(yong)于評(ping)估光(guang)纖傳輸(shu)性能(neng)的設備，主(zhu)要由光(guang)源和光(guang)功率計兩部分組成。

光(guang)(guang)(guang)(guang)(guang)源(yuan)是產生光(guang)(guang)(guang)(guang)(guang)信號的(de)裝置(zhi)，常(chang)用的(de)光(guang)(guang)(guang)(guang)(guang)源(yuan)有LED光(guang)(guang)(guang)(guang)(guang)源(yuan)、激光(guang)(guang)(guang)(guang)(guang)光(guang)(guang)(guang)(guang)(guang)源(yuan)、白熾(chi)燈(deng)光(guang)(guang)(guang)(guang)(guang)源(yuan)等。不(bu)同的(de)光(guang)(guang)(guang)(guang)(guang)源(yuan)產生的(de)光(guang)(guang)(guang)(guang)(guang)信號波長和功率有所不(bu)同，根據具體(ti)測試的(de)需求(qiu)選擇相應的(de)光(guang)(guang)(guang)(guang)(guang)源(yuan)。

光(guang)功(gong)率計是測試光(guang)信號功(gong)率大小(xiao)的(de)(de)裝置(zhi)。它通過接收被(bei)測試設(she)備傳輸(shu)過來的(de)(de)光(guang)信號，并將其(qi)轉換成電(dian)信號進行測量(liang)，從而評估光(guang)纖(xian)傳輸(shu)的(de)(de)性(xing)能。光(guang)功(gong)率計常用的(de)(de)結構是PIN衰減器結構，其(qi)優點是反應時間快，頻寬較高(gao)(gao)，精度(du)高(gao)(gao)。