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(guang)(guang)纖(xian)網絡中光(guang)(guang)信號強(qiang)度、損耗和其(qi)他也關鍵(jian)參數的設備(bei)。它通(tong)過(guo)光(guang)(guang)源和光(guang)(guang)探頭將光(guang)(guang)信號發送(song)和接收，并通(tong)過(guo)分析(xi)收到的信號來評(ping)估光(guang)(guang)纖(xian)網絡的性能。

光(guang)(guang)纖(xian)測(ce)試儀可以測(ce)量(liang)(liang)電(dian)(dian)(dian)阻，其原(yuan)理是(shi)通過(guo)光(guang)(guang)纖(xian)技術將(jiang)被測(ce)電(dian)(dian)(dian)阻點點位(wei)的(de)電(dian)(dian)(dian)信號(hao)(hao)轉(zhuan)換為(wei)光(guang)(guang)信號(hao)(hao)進行傳(chuan)輸(shu)，并(bing)利用(yong)光(guang)(guang)纖(xian)傳(chuan)輸(shu)特(te)性測(ce)量(liang)(liang)電(dian)(dian)(dian)阻值。具體來(lai)說，光(guang)(guang)纖(xian)測(ce)試儀通過(guo)一對電(dian)(dian)(dian)極將(jiang)電(dian)(dian)(dian)信號(hao)(hao)輸(shu)入到被測(ce)電(dian)(dian)(dian)阻上，然后(hou)根(gen)據歐姆定律，電(dian)(dian)(dian)流(liu)值與電(dian)(dian)(dian)阻值成正比(bi)關系，即I=U/R，其中I為(wei)電(dian)(dian)(dian)流(liu)值，U為(wei)為(wei)電(dian)(dian)(dian)壓(ya)值，R為(wei)電(dian)(dian)(dian)阻值。然后(hou)，通過(guo)測(ce)量(liang)(liang)電(dian)(dian)(dian)流(liu)值和電(dian)(dian)(dian)壓(ya)值就可以計算出電(dian)(dian)(dian)阻值。主要是(shi)輸(shu)出固(gu)定的(de)光(guang)(guang)源信號(hao)(hao)，將(jiang)該信號(hao)(hao)通過(guo)光(guang)(guang)纖(xian)傳(chuan)輸(shu)到需(xu)要測(ce)試的(de)被測(ce)設備(bei)，并(bing)在傳(chuan)輸(shu)過(guo)程中測(ce)量(liang)(liang)光(guang)(guang)功率計接收到的(de)光(guang)(guang)信號(hao)(hao)功率大小。

二、光纖測試儀由什么構成

光纖測試儀是用于評(ping)估光纖傳輸性能的設備，主(zhu)要(yao)由(you)光源(yuan)和光功(gong)率計兩部分組成(cheng)。

光(guang)(guang)(guang)(guang)源是產(chan)生光(guang)(guang)(guang)(guang)信號(hao)的(de)裝置，常用的(de)光(guang)(guang)(guang)(guang)源有LED光(guang)(guang)(guang)(guang)源、激光(guang)(guang)(guang)(guang)光(guang)(guang)(guang)(guang)源、白熾燈(deng)光(guang)(guang)(guang)(guang)源等。不同的(de)光(guang)(guang)(guang)(guang)源產(chan)生的(de)光(guang)(guang)(guang)(guang)信號(hao)波長和功率(lv)有所不同，根據(ju)具體測試的(de)需(xu)求選擇相應的(de)光(guang)(guang)(guang)(guang)源。

光(guang)(guang)功率(lv)計是(shi)測試光(guang)(guang)信(xin)號功率(lv)大小的(de)(de)裝置(zhi)。它通過接(jie)收被測試設備傳(chuan)輸過來的(de)(de)光(guang)(guang)信(xin)號，并將其轉(zhuan)換成電(dian)信(xin)號進行測量，從(cong)而評估(gu)光(guang)(guang)纖傳(chuan)輸的(de)(de)性(xing)能。光(guang)(guang)功率(lv)計常用的(de)(de)結構(gou)是(shi)PIN衰減器結構(gou)，其優(you)點是(shi)反應(ying)時間快，頻(pin)寬較高(gao)，精度(du)高(gao)。