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)纖網絡中(zhong)光(guang)信(xin)號(hao)強度、損耗和其他(ta)也關鍵(jian)參數(shu)的(de)設備。它通(tong)過(guo)(guo)光(guang)源(yuan)和光(guang)探頭將光(guang)信(xin)號(hao)發(fa)送和接收(shou)(shou)，并通(tong)過(guo)(guo)分析收(shou)(shou)到的(de)信(xin)號(hao)來評(ping)估光(guang)纖網絡的(de)性能。

光(guang)(guang)(guang)纖(xian)測試儀(yi)可以測量(liang)電(dian)(dian)(dian)(dian)(dian)阻，其原理(li)是通(tong)過(guo)光(guang)(guang)(guang)纖(xian)技(ji)術(shu)將(jiang)被(bei)測電(dian)(dian)(dian)(dian)(dian)阻點(dian)點(dian)位的(de)電(dian)(dian)(dian)(dian)(dian)信號(hao)轉(zhuan)換為光(guang)(guang)(guang)信號(hao)進行(xing)傳(chuan)(chuan)輸(shu)(shu)(shu)，并(bing)利用光(guang)(guang)(guang)纖(xian)傳(chuan)(chuan)輸(shu)(shu)(shu)特(te)性測量(liang)電(dian)(dian)(dian)(dian)(dian)阻值(zhi)(zhi)(zhi)。具體來說，光(guang)(guang)(guang)纖(xian)測試儀(yi)通(tong)過(guo)一對(dui)電(dian)(dian)(dian)(dian)(dian)極將(jiang)電(dian)(dian)(dian)(dian)(dian)信號(hao)輸(shu)(shu)(shu)入到(dao)被(bei)測電(dian)(dian)(dian)(dian)(dian)阻上，然后(hou)根(gen)據歐姆(mu)定律，電(dian)(dian)(dian)(dian)(dian)流(liu)值(zhi)(zhi)(zhi)與(yu)電(dian)(dian)(dian)(dian)(dian)阻值(zhi)(zhi)(zhi)成正比關系，即I=U/R，其中I為電(dian)(dian)(dian)(dian)(dian)流(liu)值(zhi)(zhi)(zhi)，U為為電(dian)(dian)(dian)(dian)(dian)壓(ya)值(zhi)(zhi)(zhi)，R為電(dian)(dian)(dian)(dian)(dian)阻值(zhi)(zhi)(zhi)。然后(hou)，通(tong)過(guo)測量(liang)電(dian)(dian)(dian)(dian)(dian)流(liu)值(zhi)(zhi)(zhi)和電(dian)(dian)(dian)(dian)(dian)壓(ya)值(zhi)(zhi)(zhi)就可以計(ji)算(suan)出(chu)電(dian)(dian)(dian)(dian)(dian)阻值(zhi)(zhi)(zhi)。主要是輸(shu)(shu)(shu)出(chu)固定的(de)光(guang)(guang)(guang)源(yuan)信號(hao)，將(jiang)該信號(hao)通(tong)過(guo)光(guang)(guang)(guang)纖(xian)傳(chuan)(chuan)輸(shu)(shu)(shu)到(dao)需要測試的(de)被(bei)測設(she)備(bei)，并(bing)在(zai)傳(chuan)(chuan)輸(shu)(shu)(shu)過(guo)程中測量(liang)光(guang)(guang)(guang)功(gong)率計(ji)接(jie)收到(dao)的(de)光(guang)(guang)(guang)信號(hao)功(gong)率大(da)小。

二、光纖測試儀由什么構成

光纖測試儀是用于評估光纖傳輸性能的(de)設備，主要由(you)光源(yuan)和光功率計兩(liang)部分組成。

光(guang)源(yuan)(yuan)(yuan)是產(chan)(chan)生光(guang)信(xin)號的裝置(zhi)，常用的光(guang)源(yuan)(yuan)(yuan)有LED光(guang)源(yuan)(yuan)(yuan)、激光(guang)光(guang)源(yuan)(yuan)(yuan)、白熾燈(deng)光(guang)源(yuan)(yuan)(yuan)等。不同(tong)的光(guang)源(yuan)(yuan)(yuan)產(chan)(chan)生的光(guang)信(xin)號波長和功率(lv)有所不同(tong)，根據具體測試的需求選擇相應的光(guang)源(yuan)(yuan)(yuan)。

光(guang)(guang)(guang)功(gong)率(lv)(lv)計是測(ce)試光(guang)(guang)(guang)信號(hao)功(gong)率(lv)(lv)大小的(de)裝置(zhi)。它通過接(jie)收被(bei)測(ce)試設備(bei)傳(chuan)輸過來的(de)光(guang)(guang)(guang)信號(hao)，并將其轉(zhuan)換成(cheng)電信號(hao)進行測(ce)量，從而評估(gu)光(guang)(guang)(guang)纖傳(chuan)輸的(de)性能。光(guang)(guang)(guang)功(gong)率(lv)(lv)計常用的(de)結(jie)構(gou)是PIN衰減(jian)器結(jie)構(gou)，其優點是反應時間快，頻寬較高(gao)，精度(du)高(gao)。