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)(guang)纖網絡中(zhong)光(guang)(guang)信號強度、損耗和其他(ta)也關(guan)鍵參(can)數的設備。它通(tong)過光(guang)(guang)源(yuan)和光(guang)(guang)探頭將光(guang)(guang)信號發送和接(jie)收(shou)，并通(tong)過分析收(shou)到的信號來評(ping)估光(guang)(guang)纖網絡的性能。

光(guang)(guang)纖(xian)測(ce)(ce)試(shi)儀可以測(ce)(ce)量(liang)電(dian)(dian)(dian)阻，其(qi)原(yuan)理(li)是(shi)通過(guo)光(guang)(guang)纖(xian)技術將(jiang)被(bei)測(ce)(ce)電(dian)(dian)(dian)阻點(dian)點(dian)位的電(dian)(dian)(dian)信(xin)號(hao)(hao)(hao)轉換為(wei)(wei)光(guang)(guang)信(xin)號(hao)(hao)(hao)進行傳輸(shu)，并(bing)(bing)利用光(guang)(guang)纖(xian)傳輸(shu)特性(xing)測(ce)(ce)量(liang)電(dian)(dian)(dian)阻值。具體來說，光(guang)(guang)纖(xian)測(ce)(ce)試(shi)儀通過(guo)一對電(dian)(dian)(dian)極將(jiang)電(dian)(dian)(dian)信(xin)號(hao)(hao)(hao)輸(shu)入到被(bei)測(ce)(ce)電(dian)(dian)(dian)阻上(shang)，然(ran)后根據歐(ou)姆定(ding)律，電(dian)(dian)(dian)流值與電(dian)(dian)(dian)阻值成正比關系，即I=U/R，其(qi)中I為(wei)(wei)電(dian)(dian)(dian)流值，U為(wei)(wei)為(wei)(wei)電(dian)(dian)(dian)壓(ya)值，R為(wei)(wei)電(dian)(dian)(dian)阻值。然(ran)后，通過(guo)測(ce)(ce)量(liang)電(dian)(dian)(dian)流值和(he)電(dian)(dian)(dian)壓(ya)值就可以計(ji)算出電(dian)(dian)(dian)阻值。主要是(shi)輸(shu)出固定(ding)的光(guang)(guang)源信(xin)號(hao)(hao)(hao)，將(jiang)該信(xin)號(hao)(hao)(hao)通過(guo)光(guang)(guang)纖(xian)傳輸(shu)到需要測(ce)(ce)試(shi)的被(bei)測(ce)(ce)設備，并(bing)(bing)在(zai)傳輸(shu)過(guo)程中測(ce)(ce)量(liang)光(guang)(guang)功率計(ji)接收到的光(guang)(guang)信(xin)號(hao)(hao)(hao)功率大(da)小。

二、光纖測試儀由什么構成

光纖測試儀是用于(yu)評估光(guang)纖傳(chuan)輸(shu)性能的設(she)備，主(zhu)要由光(guang)源和光(guang)功率計兩部(bu)分組成。

光源是產(chan)生光信號(hao)的(de)裝置(zhi)，常用的(de)光源有LED光源、激光光源、白熾燈光源等。不同的(de)光源產(chan)生的(de)光信號(hao)波長(chang)和功(gong)率有所不同，根據具體(ti)測試的(de)需求(qiu)選擇(ze)相應的(de)光源。

光(guang)功率(lv)計(ji)是(shi)測(ce)試光(guang)信號(hao)功率(lv)大(da)小的裝置。它通(tong)過接收被(bei)測(ce)試設備(bei)傳(chuan)輸(shu)過來的光(guang)信號(hao)，并(bing)將其轉換成(cheng)電(dian)信號(hao)進行測(ce)量，從而評估光(guang)纖傳(chuan)輸(shu)的性能。光(guang)功率(lv)計(ji)常用的結構(gou)是(shi)PIN衰減器(qi)結構(gou)，其優(you)點是(shi)反應時間快，頻寬(kuan)較高，精度高。