一、光纖測試儀的原理是什么
光纖測試儀是(shi)一種用于測量光(guang)(guang)(guang)纖網絡(luo)中光(guang)(guang)(guang)信號強(qiang)度、損耗和其(qi)他也關鍵參數的設備。它(ta)通(tong)過光(guang)(guang)(guang)源和光(guang)(guang)(guang)探(tan)頭將光(guang)(guang)(guang)信號發送和接收,并通(tong)過分析收到的信號來(lai)評估光(guang)(guang)(guang)纖網絡(luo)的性能。
光(guang)(guang)(guang)纖(xian)測(ce)試儀可以測(ce)量電(dian)(dian)阻(zu)(zu)(zu),其(qi)原(yuan)理是通(tong)(tong)過(guo)光(guang)(guang)(guang)纖(xian)技術將(jiang)(jiang)被(bei)測(ce)電(dian)(dian)阻(zu)(zu)(zu)點點位的電(dian)(dian)信號轉換為光(guang)(guang)(guang)信號進(jin)行傳(chuan)(chuan)輸(shu)(shu),并利用光(guang)(guang)(guang)纖(xian)傳(chuan)(chuan)輸(shu)(shu)特性測(ce)量電(dian)(dian)阻(zu)(zu)(zu)值(zhi)。具體來說,光(guang)(guang)(guang)纖(xian)測(ce)試儀通(tong)(tong)過(guo)一對電(dian)(dian)極將(jiang)(jiang)電(dian)(dian)信號輸(shu)(shu)入到被(bei)測(ce)電(dian)(dian)阻(zu)(zu)(zu)上,然(ran)后根據歐姆(mu)定(ding)律,電(dian)(dian)流值(zhi)與電(dian)(dian)阻(zu)(zu)(zu)值(zhi)成正比(bi)關系,即(ji)I=U/R,其(qi)中(zhong)I為電(dian)(dian)流值(zhi),U為為電(dian)(dian)壓(ya)(ya)值(zhi),R為電(dian)(dian)阻(zu)(zu)(zu)值(zhi)。然(ran)后,通(tong)(tong)過(guo)測(ce)量電(dian)(dian)流值(zhi)和電(dian)(dian)壓(ya)(ya)值(zhi)就(jiu)可以計(ji)算出電(dian)(dian)阻(zu)(zu)(zu)值(zhi)。主要(yao)是輸(shu)(shu)出固定(ding)的光(guang)(guang)(guang)源信號,將(jiang)(jiang)該(gai)信號通(tong)(tong)過(guo)光(guang)(guang)(guang)纖(xian)傳(chuan)(chuan)輸(shu)(shu)到需要(yao)測(ce)試的被(bei)測(ce)設備,并在傳(chuan)(chuan)輸(shu)(shu)過(guo)程中(zhong)測(ce)量光(guang)(guang)(guang)功率計(ji)接(jie)收到的光(guang)(guang)(guang)信號功率大小。
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(xian)傳輸性能的設備(bei),主(zhu)要由光源(yuan)和(he)光功率(lv)計兩部分組成(cheng)。
光源是產生光信(xin)號的(de)裝置(zhi),常用的(de)光源有LED光源、激光光源、白熾燈光源等。不同的(de)光源產生的(de)光信(xin)號波長和功率有所不同,根據具體(ti)測試的(de)需求(qiu)選擇相應的(de)光源。
光(guang)功率計(ji)是(shi)測試光(guang)信號功率大小的(de)(de)裝置。它通過接(jie)收(shou)被測試設(she)備傳(chuan)輸(shu)過來(lai)的(de)(de)光(guang)信號,并將其轉換成電信號進行測量(liang),從而(er)評估(gu)光(guang)纖(xian)傳(chuan)輸(shu)的(de)(de)性能。光(guang)功率計(ji)常用的(de)(de)結(jie)構(gou)(gou)是(shi)PIN衰減器結(jie)構(gou)(gou),其優(you)點是(shi)反(fan)應時間快,頻(pin)寬(kuan)較(jiao)高(gao),精度高(gao)。