一、光纖測試儀的原理是什么

光纖測試儀是(shi)一種(zhong)用于測量光(guang)(guang)纖(xian)網絡中光(guang)(guang)信(xin)號強度、損(sun)耗(hao)和其(qi)他也關鍵(jian)參(can)數(shu)的設備(bei)。它通過(guo)光(guang)(guang)源和光(guang)(guang)探(tan)頭將光(guang)(guang)信(xin)號發(fa)送(song)和接收，并通過(guo)分析收到的信(xin)號來評估光(guang)(guang)纖(xian)網絡的性能。

光纖(xian)測(ce)試(shi)儀(yi)可(ke)以(yi)測(ce)量(liang)(liang)電(dian)(dian)(dian)阻(zu)，其原理是(shi)(shi)通(tong)(tong)過(guo)(guo)光纖(xian)技術將(jiang)被測(ce)電(dian)(dian)(dian)阻(zu)點(dian)點(dian)位(wei)的(de)(de)電(dian)(dian)(dian)信(xin)(xin)號轉換為(wei)(wei)光信(xin)(xin)號進行傳(chuan)輸(shu)，并(bing)(bing)利用光纖(xian)傳(chuan)輸(shu)特性測(ce)量(liang)(liang)電(dian)(dian)(dian)阻(zu)值(zhi)(zhi)(zhi)。具體(ti)來說，光纖(xian)測(ce)試(shi)儀(yi)通(tong)(tong)過(guo)(guo)一對(dui)電(dian)(dian)(dian)極將(jiang)電(dian)(dian)(dian)信(xin)(xin)號輸(shu)入到被測(ce)電(dian)(dian)(dian)阻(zu)上，然后根據(ju)歐(ou)姆定律，電(dian)(dian)(dian)流值(zhi)(zhi)(zhi)與(yu)電(dian)(dian)(dian)阻(zu)值(zhi)(zhi)(zhi)成正比關系，即I=U/R，其中I為(wei)(wei)電(dian)(dian)(dian)流值(zhi)(zhi)(zhi)，U為(wei)(wei)為(wei)(wei)電(dian)(dian)(dian)壓值(zhi)(zhi)(zhi)，R為(wei)(wei)電(dian)(dian)(dian)阻(zu)值(zhi)(zhi)(zhi)。然后，通(tong)(tong)過(guo)(guo)測(ce)量(liang)(liang)電(dian)(dian)(dian)流值(zhi)(zhi)(zhi)和電(dian)(dian)(dian)壓值(zhi)(zhi)(zhi)就(jiu)可(ke)以(yi)計算出電(dian)(dian)(dian)阻(zu)值(zhi)(zhi)(zhi)。主要是(shi)(shi)輸(shu)出固定的(de)(de)光源信(xin)(xin)號，將(jiang)該信(xin)(xin)號通(tong)(tong)過(guo)(guo)光纖(xian)傳(chuan)輸(shu)到需要測(ce)試(shi)的(de)(de)被測(ce)設備，并(bing)(bing)在傳(chuan)輸(shu)過(guo)(guo)程中測(ce)量(liang)(liang)光功率(lv)(lv)計接(jie)收到的(de)(de)光信(xin)(xin)號功率(lv)(lv)大小。

二、光纖測試儀由什么構成

光纖測試儀是用于評估光(guang)纖傳(chuan)輸(shu)性(xing)能的設備，主要由光(guang)源和光(guang)功率(lv)計兩部分組成。

光(guang)(guang)(guang)(guang)源是(shi)產生光(guang)(guang)(guang)(guang)信(xin)號(hao)的(de)(de)(de)裝(zhuang)置，常用(yong)的(de)(de)(de)光(guang)(guang)(guang)(guang)源有(you)LED光(guang)(guang)(guang)(guang)源、激光(guang)(guang)(guang)(guang)光(guang)(guang)(guang)(guang)源、白熾燈光(guang)(guang)(guang)(guang)源等。不同的(de)(de)(de)光(guang)(guang)(guang)(guang)源產生的(de)(de)(de)光(guang)(guang)(guang)(guang)信(xin)號(hao)波長和功率有(you)所不同，根據(ju)具體測(ce)試的(de)(de)(de)需求選擇(ze)相應的(de)(de)(de)光(guang)(guang)(guang)(guang)源。

光(guang)(guang)功率(lv)計是(shi)測試光(guang)(guang)信號功率(lv)大小的(de)(de)裝置。它通(tong)過接收被測試設備傳輸(shu)過來的(de)(de)光(guang)(guang)信號，并將其轉(zhuan)換成電信號進行測量，從而(er)評估光(guang)(guang)纖傳輸(shu)的(de)(de)性能。光(guang)(guang)功率(lv)計常用的(de)(de)結構是(shi)PIN衰(shuai)減器(qi)結構，其優點是(shi)反應時間(jian)快(kuai)，頻(pin)寬較高(gao)，精度高(gao)。