一、光纖測試儀的原理是什么
光纖測試儀是一(yi)種用于測量光纖(xian)網(wang)絡(luo)中(zhong)光信(xin)號(hao)強度、損耗和其他也(ye)關鍵參數的設備。它通過光源和光探(tan)頭將光信(xin)號(hao)發(fa)送和接收,并通過分(fen)析(xi)收到(dao)的信(xin)號(hao)來評(ping)估光纖(xian)網(wang)絡(luo)的性能。
光(guang)纖(xian)(xian)測(ce)(ce)(ce)試儀可以測(ce)(ce)(ce)量(liang)電(dian)(dian)阻(zu),其原理是通(tong)過(guo)(guo)光(guang)纖(xian)(xian)技(ji)術將(jiang)(jiang)被測(ce)(ce)(ce)電(dian)(dian)阻(zu)點點位的(de)電(dian)(dian)信(xin)(xin)號(hao)(hao)轉(zhuan)換為光(guang)信(xin)(xin)號(hao)(hao)進行傳輸,并(bing)利用光(guang)纖(xian)(xian)傳輸特性測(ce)(ce)(ce)量(liang)電(dian)(dian)阻(zu)值(zhi)(zhi)。具體來說,光(guang)纖(xian)(xian)測(ce)(ce)(ce)試儀通(tong)過(guo)(guo)一對電(dian)(dian)極將(jiang)(jiang)電(dian)(dian)信(xin)(xin)號(hao)(hao)輸入到(dao)(dao)被測(ce)(ce)(ce)電(dian)(dian)阻(zu)上,然后根(gen)據(ju)歐姆定(ding)律,電(dian)(dian)流(liu)(liu)值(zhi)(zhi)與電(dian)(dian)阻(zu)值(zhi)(zhi)成正比關系,即I=U/R,其中(zhong)I為電(dian)(dian)流(liu)(liu)值(zhi)(zhi),U為為電(dian)(dian)壓(ya)值(zhi)(zhi),R為電(dian)(dian)阻(zu)值(zhi)(zhi)。然后,通(tong)過(guo)(guo)測(ce)(ce)(ce)量(liang)電(dian)(dian)流(liu)(liu)值(zhi)(zhi)和電(dian)(dian)壓(ya)值(zhi)(zhi)就可以計算出(chu)電(dian)(dian)阻(zu)值(zhi)(zhi)。主要是輸出(chu)固定(ding)的(de)光(guang)源信(xin)(xin)號(hao)(hao),將(jiang)(jiang)該(gai)信(xin)(xin)號(hao)(hao)通(tong)過(guo)(guo)光(guang)纖(xian)(xian)傳輸到(dao)(dao)需要測(ce)(ce)(ce)試的(de)被測(ce)(ce)(ce)設備,并(bing)在傳輸過(guo)(guo)程中(zhong)測(ce)(ce)(ce)量(liang)光(guang)功(gong)率計接收到(dao)(dao)的(de)光(guang)信(xin)(xin)號(hao)(hao)功(gong)率大小。
二、光纖測試儀由什么構成
光纖測試儀是用于評估(gu)光纖傳輸性能的設備(bei),主要由光源和光功率計(ji)兩(liang)部分組成。
光(guang)(guang)(guang)(guang)源(yuan)(yuan)是(shi)產生(sheng)光(guang)(guang)(guang)(guang)信(xin)號的(de)(de)(de)(de)裝置,常用的(de)(de)(de)(de)光(guang)(guang)(guang)(guang)源(yuan)(yuan)有LED光(guang)(guang)(guang)(guang)源(yuan)(yuan)、激光(guang)(guang)(guang)(guang)光(guang)(guang)(guang)(guang)源(yuan)(yuan)、白熾燈光(guang)(guang)(guang)(guang)源(yuan)(yuan)等。不同(tong)的(de)(de)(de)(de)光(guang)(guang)(guang)(guang)源(yuan)(yuan)產生(sheng)的(de)(de)(de)(de)光(guang)(guang)(guang)(guang)信(xin)號波長和功率有所不同(tong),根據(ju)具體測試的(de)(de)(de)(de)需求選擇(ze)相(xiang)應的(de)(de)(de)(de)光(guang)(guang)(guang)(guang)源(yuan)(yuan)。
光(guang)(guang)功(gong)率(lv)計是(shi)測(ce)試光(guang)(guang)信(xin)號(hao)功(gong)率(lv)大小的(de)(de)裝置。它通過(guo)接(jie)收被測(ce)試設(she)備傳輸(shu)過(guo)來的(de)(de)光(guang)(guang)信(xin)號(hao),并將其轉換(huan)成電(dian)信(xin)號(hao)進行(xing)測(ce)量,從(cong)而評估光(guang)(guang)纖傳輸(shu)的(de)(de)性能(neng)。光(guang)(guang)功(gong)率(lv)計常用(yong)的(de)(de)結(jie)構是(shi)PIN衰減(jian)器結(jie)構,其優(you)點是(shi)反應時(shi)間快,頻寬較(jiao)高(gao)(gao),精度(du)高(gao)(gao)。