一、光纖測試儀的原理是什么
光纖測試儀是一(yi)種用(yong)于(yu)測量光纖(xian)網絡中光信(xin)號(hao)強度、損耗(hao)和其他也關鍵(jian)參(can)數的設備。它通過(guo)光源和光探頭(tou)將光信(xin)號(hao)發送和接收(shou)(shou),并通過(guo)分(fen)析收(shou)(shou)到的信(xin)號(hao)來評估光纖(xian)網絡的性能。
光(guang)(guang)纖測(ce)(ce)(ce)(ce)(ce)(ce)試(shi)儀可(ke)以測(ce)(ce)(ce)(ce)(ce)(ce)量(liang)電(dian)(dian)(dian)阻(zu)(zu),其原理是(shi)通過(guo)光(guang)(guang)纖技(ji)術將(jiang)被(bei)測(ce)(ce)(ce)(ce)(ce)(ce)電(dian)(dian)(dian)阻(zu)(zu)點點位的(de)電(dian)(dian)(dian)信(xin)號轉換為(wei)(wei)光(guang)(guang)信(xin)號進行(xing)傳輸(shu),并利用光(guang)(guang)纖傳輸(shu)特性測(ce)(ce)(ce)(ce)(ce)(ce)量(liang)電(dian)(dian)(dian)阻(zu)(zu)值(zhi)(zhi)。具體(ti)來說,光(guang)(guang)纖測(ce)(ce)(ce)(ce)(ce)(ce)試(shi)儀通過(guo)一對電(dian)(dian)(dian)極將(jiang)電(dian)(dian)(dian)信(xin)號輸(shu)入到被(bei)測(ce)(ce)(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(zhi)(zhi)與電(dian)(dian)(dian)阻(zu)(zu)值(zhi)(zhi)成正(zheng)比關系,即I=U/R,其中(zhong)I為(wei)(wei)電(dian)(dian)(dian)流值(zhi)(zhi),U為(wei)(wei)為(wei)(wei)電(dian)(dian)(dian)壓值(zhi)(zhi),R為(wei)(wei)電(dian)(dian)(dian)阻(zu)(zu)值(zhi)(zhi)。然后(hou),通過(guo)測(ce)(ce)(ce)(ce)(ce)(ce)量(liang)電(dian)(dian)(dian)流值(zhi)(zhi)和(he)電(dian)(dian)(dian)壓值(zhi)(zhi)就可(ke)以計算出(chu)電(dian)(dian)(dian)阻(zu)(zu)值(zhi)(zhi)。主要是(shi)輸(shu)出(chu)固定的(de)光(guang)(guang)源信(xin)號,將(jiang)該(gai)信(xin)號通過(guo)光(guang)(guang)纖傳輸(shu)到需要測(ce)(ce)(ce)(ce)(ce)(ce)試(shi)的(de)被(bei)測(ce)(ce)(ce)(ce)(ce)(ce)設(she)備,并在傳輸(shu)過(guo)程中(zhong)測(ce)(ce)(ce)(ce)(ce)(ce)量(liang)光(guang)(guang)功(gong)率計接收到的(de)光(guang)(guang)信(xin)號功(gong)率大小。
二、光纖測試儀由什么構成
光纖測試儀是(shi)用于(yu)評估光纖傳輸性能(neng)的設備,主(zhu)要由光源(yuan)和光功率計兩部分組(zu)成。
光(guang)源(yuan)是產(chan)生光(guang)信(xin)號的(de)裝置,常用(yong)的(de)光(guang)源(yuan)有LED光(guang)源(yuan)、激(ji)光(guang)光(guang)源(yuan)、白熾燈光(guang)源(yuan)等(deng)。不同的(de)光(guang)源(yuan)產(chan)生的(de)光(guang)信(xin)號波(bo)長和功率有所不同,根據具體測試的(de)需求選擇(ze)相(xiang)應的(de)光(guang)源(yuan)。
光(guang)(guang)功率計是(shi)測試(shi)(shi)光(guang)(guang)信(xin)號功率大小的裝置。它通過接收被測試(shi)(shi)設備傳輸過來(lai)的光(guang)(guang)信(xin)號,并將其轉換(huan)成電(dian)信(xin)號進行測量,從(cong)而評(ping)估光(guang)(guang)纖傳輸的性能。光(guang)(guang)功率計常用的結構(gou)是(shi)PIN衰(shuai)減(jian)器結構(gou),其優點是(shi)反應時(shi)間(jian)快,頻寬較高(gao)(gao),精(jing)度高(gao)(gao)。