一、光纖測試儀的原理是什么
光纖測試儀是一種用于(yu)測量光(guang)纖(xian)網絡中光(guang)信號(hao)強度、損耗和其他也關鍵參數的(de)設備。它通(tong)過光(guang)源和光(guang)探頭將光(guang)信號(hao)發(fa)送(song)和接收,并通(tong)過分(fen)析收到的(de)信號(hao)來評(ping)估光(guang)纖(xian)網絡的(de)性能(neng)。
光纖(xian)(xian)測(ce)(ce)(ce)(ce)試儀可(ke)(ke)以測(ce)(ce)(ce)(ce)量電(dian)(dian)(dian)阻(zu)(zu),其原理是通過光纖(xian)(xian)技(ji)術(shu)將被(bei)(bei)測(ce)(ce)(ce)(ce)電(dian)(dian)(dian)阻(zu)(zu)點點位的(de)電(dian)(dian)(dian)信(xin)(xin)號(hao)轉(zhuan)換為(wei)光信(xin)(xin)號(hao)進行傳輸(shu)(shu),并(bing)利用(yong)光纖(xian)(xian)傳輸(shu)(shu)特性測(ce)(ce)(ce)(ce)量電(dian)(dian)(dian)阻(zu)(zu)值。具體來說,光纖(xian)(xian)測(ce)(ce)(ce)(ce)試儀通過一對電(dian)(dian)(dian)極將電(dian)(dian)(dian)信(xin)(xin)號(hao)輸(shu)(shu)入(ru)到被(bei)(bei)測(ce)(ce)(ce)(ce)電(dian)(dian)(dian)阻(zu)(zu)上,然后(hou)根據歐姆定律,電(dian)(dian)(dian)流值與電(dian)(dian)(dian)阻(zu)(zu)值成正比關系,即I=U/R,其中I為(wei)電(dian)(dian)(dian)流值,U為(wei)為(wei)電(dian)(dian)(dian)壓值,R為(wei)電(dian)(dian)(dian)阻(zu)(zu)值。然后(hou),通過測(ce)(ce)(ce)(ce)量電(dian)(dian)(dian)流值和電(dian)(dian)(dian)壓值就可(ke)(ke)以計算(suan)出(chu)電(dian)(dian)(dian)阻(zu)(zu)值。主要是輸(shu)(shu)出(chu)固(gu)定的(de)光源信(xin)(xin)號(hao),將該信(xin)(xin)號(hao)通過光纖(xian)(xian)傳輸(shu)(shu)到需要測(ce)(ce)(ce)(ce)試的(de)被(bei)(bei)測(ce)(ce)(ce)(ce)設(she)備(bei),并(bing)在傳輸(shu)(shu)過程中測(ce)(ce)(ce)(ce)量光功(gong)率(lv)計接收到的(de)光信(xin)(xin)號(hao)功(gong)率(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纖(xian)傳輸性能的設備,主要由光源和(he)光功率計兩部分組(zu)成。
光(guang)源(yuan)(yuan)是產(chan)生光(guang)信號的裝置,常用的光(guang)源(yuan)(yuan)有LED光(guang)源(yuan)(yuan)、激光(guang)光(guang)源(yuan)(yuan)、白熾燈光(guang)源(yuan)(yuan)等。不同(tong)的光(guang)源(yuan)(yuan)產(chan)生的光(guang)信號波長和功率(lv)有所不同(tong),根據(ju)具體(ti)測試的需求選擇相應的光(guang)源(yuan)(yuan)。
光(guang)功率計(ji)是測(ce)試光(guang)信號功率大小的裝置(zhi)。它通過(guo)接收被測(ce)試設(she)備傳(chuan)輸(shu)過(guo)來的光(guang)信號,并將其(qi)轉換成電信號進(jin)行測(ce)量,從而(er)評估光(guang)纖傳(chuan)輸(shu)的性能。光(guang)功率計(ji)常用的結構(gou)是PIN衰減器結構(gou),其(qi)優點是反應時間(jian)快,頻(pin)寬較高,精度高。