視頻監控安裝與調整重(zhong)慶監控公司(si)為(wei)你總(zong)結(jie)

視頻光端(duan)維(wei)護
　　視(shi)頻光端機(ji)分為發射端(duan)(duan)(duan)(duan)(duan)(duan)設備(bei)和接(jie)收(shou)端(duan)(duan)(duan)(duan)(duan)(duan)設備(bei)，發射端(duan)(duan)(duan)(duan)(duan)(duan)設備(bei)和攝像機(ji)(ji)一樣置于室外(wai)，工程人員(yuan)通常(chang)(chang)是(shi)(shi)對發射端(duan)(duan)(duan)(duan)(duan)(duan)設備(bei)過行(xing)維護測(ce)試(shi)。對于光(guang)(guang)端(duan)(duan)(duan)(duan)(duan)(duan)機(ji)(ji)的(de)(de)(de)檢修工作，分三個步驟進行(xing)測(ce)試(shi)。第一，用(yong)(yong)(yong)視(shi)頻監(jian)控(kong)綜合測(ce)試(shi)儀(yi)(yi)的(de)(de)(de)萬用(yong)(yong)(yong)表測(ce)量光(guang)(guang)端(duan)(duan)(duan)(duan)(duan)(duan)機(ji)(ji)的(de)(de)(de)供電(dian)是(shi)(shi)否正(zheng)常(chang)(chang)，一般(ban)電(dian)源輸入(ru)是(shi)(shi)直流(liu)5V；第二，測(ce)量光(guang)(guang)端(duan)(duan)(duan)(duan)(duan)(duan)機(ji)(ji)的(de)(de)(de)光(guang)(guang)纖輸出功(gong)率是(shi)(shi)否正(zheng)常(chang)(chang)，發射端(duan)(duan)(duan)(duan)(duan)(duan)發射波長是(shi)(shi)1310n接(jie)收(shou)波長1510n，20KM的(de)(de)(de)光(guang)(guang)端(duan)(duan)(duan)(duan)(duan)(duan)機(ji)(ji)一般(ban)發射功(gong)率是(shi)(shi)-9dBm左右；第三，測(ce)試(shi)光(guang)(guang)端(duan)(duan)(duan)(duan)(duan)(duan)機(ji)(ji)的(de)(de)(de)視(shi)頻端(duan)(duan)(duan)(duan)(duan)(duan)口和RS485/RS232通信是(shi)(shi)否正(zheng)常(chang)(chang)。監(jian)控(kong)綜合測(ce)試(shi)儀(yi)(yi)發送標(biao)準彩色圖型條圖像信號到視(shi)頻光(guang)(guang)端(duan)(duan)(duan)(duan)(duan)(duan)機(ji)(ji)，監(jian)控(kong)中(zhong)心(xin)收(shou)到視(shi)頻光(guang)(guang)端(duan)(duan)(duan)(duan)(duan)(duan)機(ji)(ji)送來(lai)的(de)(de)(de)測(ce)試(shi)彩色條，說明視(shi)頻傳輸部份正(zheng)常(chang)(chang)；用(yong)(yong)(yong)儀(yi)(yi)表的(de)(de)(de) RS485/RS232數(shu)據捕捉功(gong)能接(jie)收(shou)光(guang)(guang)端(duan)(duan)(duan)(duan)(duan)(duan)機(ji)(ji)的(de)(de)(de)控(kong)制信號，如果(guo)接(jie)收(shou)到監(jian)控(kong)中(zhong)心(xin)發送過來(lai)的(de)(de)(de)控(kong)制代碼，說明光(guang)(guang)端(duan)(duan)(duan)(duan)(duan)(duan)機(ji)(ji)的(de)(de)(de)RS485/RS232通信傳輸正(zheng)常(chang)(chang)。

    BNC同(tong)軸電纜傳輸維護
　　目前(qian)的視(shi)頻監控(kong)系統(tong)(tong)，傳統(tong)(tong)的模擬圖像(xiang)(xiang)占主導(dao)地(di)位，IP數字攝像(xiang)(xiang)由于(yu)兼容性(xing)等問題(ti)，暫時未來(lai)得到普(pu)及。一般小(xiao)區域的監控(kong)系統(tong)(tong)如工(gong)(gong)廠、樓宇(yu)，直接(jie)采(cai)用BNC 同(tong)軸電(dian)纜(lan)(lan)傳輸圖像(xiang)(xiang)，BNC同(tong)軸電(dian)纜(lan)(lan)由于(yu)抗干擾性(xing)弱，而且每條BNC線(xian)纜(lan)(lan)只能傳輸一路視(shi)頻，但由于(yu)監控(kong)區域小(xiao)，采(cai)用同(tong)軸電(dian)纜(lan)(lan)傳輸相對成(cheng)本較低，BNC同(tong)軸電(dian)纜(lan)(lan)得以普(pu)遍(bian)使(shi)用。BNC線(xian)纜(lan)(lan)由于(yu)老化、人為損壞(huai)等原因，造(zao)成(cheng)視(shi)頻圖像(xiang)(xiang)質量下降甚至中(zhong)(zhong)斷，在維護工(gong)(gong)作中(zhong)(zhong)通常需要(yao)檢測BNC線(xian)纜(lan)(lan)是否有(you)問題(ti)。
　　工(gong)(gong)程人(ren)員對線(xian)(xian)(xian)纜(lan)維護時，使(shi)(shi)用(yong)(yong)(yong)綜合測(ce)(ce)(ce)(ce)試儀(yi)(yi)(yi)(yi)做三(san)個(ge)步驟的(de)(de)工(gong)(gong)作(zuo)，第一，在(zai)攝像(xiang)機端，將BNC線(xian)(xian)(xian)纜(lan)接入儀(yi)(yi)(yi)(yi)表(biao)(biao)，使(shi)(shi)用(yong)(yong)(yong)儀(yi)(yi)(yi)(yi)表(biao)(biao)的(de)(de)圖(tu)像(xiang)發生器(qi)發送標準彩色圖(tu)型(xing)條，正常(chang)情(qing)況下，監(jian)(jian)控中心的(de)(de)監(jian)(jian)視器(qi)應該收到同(tong)樣的(de)(de)彩色圖(tu)型(xing)條，這個(ge)步驟判斷(duan)(duan)BNC線(xian)(xian)(xian)是否斷(duan)(duan)開(kai)(kai)，監(jian)(jian)控中心收到圖(tu)像(xiang)色彩是否正常(chang)；第二，在(zai)監(jian)(jian)控中心，使(shi)(shi)用(yong)(yong)(yong)儀(yi)(yi)(yi)(yi)表(biao)(biao)的(de)(de)視頻信號衰(shuai)減(jian)測(ce)(ce)(ce)(ce)量(liang)功能(neng)(neng)，測(ce)(ce)(ce)(ce)量(liang)視頻復和電平經(jing)過BNC線(xian)(xian)(xian)纜(lan)傳輸(shu)后是否衰(shuai)減(jian)過大(da)，一般(ban)正常(chang)是800-1000mV，衰(shuai)減(jian)過大(da)會造成圖(tu)像(xiang)抖(dou)動(dong)、圖(tu)像(xiang)變暗等現象。第三(san)，如果 BNC線(xian)(xian)(xian)纜(lan)中間斷(duan)(duan)開(kai)(kai)，因為BNC線(xian)(xian)(xian)纜(lan)埋在(zai)線(xian)(xian)(xian)槽里，工(gong)(gong)程人(ren)員沒有測(ce)(ce)(ce)(ce)試工(gong)(gong)具(ju)要找(zhao)出故障點非常(chang)困難，使(shi)(shi)用(yong)(yong)(yong)綜合測(ce)(ce)(ce)(ce)試儀(yi)(yi)(yi)(yi)表(biao)(biao)的(de)(de)測(ce)(ce)(ce)(ce)線(xian)(xian)(xian)功能(neng)(neng)，儀(yi)(yi)(yi)(yi)表(biao)(biao)發射信號并測(ce)(ce)(ce)(ce)量(liang)出大(da)概斷(duan)(duan)點位置(zhi)，為工(gong)(gong)程人(ren)員馬上找(zhao)到斷(duan)(duan)點位置(zhi)，大(da)大(da)提高工(gong)(gong)作(zuo)效(xiao)率。

　　光(guang)纖傳輸維護
　　光(guang)(guang)(guang)(guang)(guang)(guang)纖(xian)(xian)(xian)(xian)傳(chuan)輸具(ju)有容(rong)量(liang)(liang)(liang)大(da)、高(gao)(gao)速率(lv)(lv)、高(gao)(gao)穩(wen)定(ding)(ding)性等(deng)(deng)特(te)點，視頻(pin)(pin)(pin)監(jian)(jian)控(kong)系(xi)統(tong)(tong)(tong)越來越多(duo)采用視頻(pin)(pin)(pin)光(guang)(guang)(guang)(guang)(guang)(guang)端機(ji)、光(guang)(guang)(guang)(guang)(guang)(guang)收發(fa)(fa)器等(deng)(deng)光(guang)(guang)(guang)(guang)(guang)(guang)纖(xian)(xian)(xian)(xian)設(she)備(bei)來傳(chuan)送視頻(pin)(pin)(pin)圖(tu)像和控(kong)制信(xin)號(hao)。高(gao)(gao)速公(gong)路監(jian)(jian)控(kong)、平安城市監(jian)(jian)控(kong)等(deng)(deng)大(da)規(gui)型的(de)(de)(de)(de)(de)(de)監(jian)(jian)控(kong)系(xi)統(tong)(tong)(tong)采用光(guang)(guang)(guang)(guang)(guang)(guang)纖(xian)(xian)(xian)(xian)傳(chuan)輸來實現高(gao)(gao)穩(wen)定(ding)(ding)的(de)(de)(de)(de)(de)(de)視頻(pin)(pin)(pin)傳(chuan)輸，隨著光(guang)(guang)(guang)(guang)(guang)(guang)纖(xian)(xian)(xian)(xian)通信(xin)技術(shu)發(fa)(fa)展，視頻(pin)(pin)(pin)光(guang)(guang)(guang)(guang)(guang)(guang)端和光(guang)(guang)(guang)(guang)(guang)(guang)纖(xian)(xian)(xian)(xian)線(xian)纜價(jia)格越來越低，視頻(pin)(pin)(pin)監(jian)(jian)控(kong)系(xi)統(tong)(tong)(tong)采用光(guang)(guang)(guang)(guang)(guang)(guang)纖(xian)(xian)(xian)(xian)傳(chuan)輸已經非常普(pu)及。光(guang)(guang)(guang)(guang)(guang)(guang)纖(xian)(xian)(xian)(xian)傳(chuan)輸通常是(shi)應(ying)用在幾(ji)百米到一百公(gong)里之(zhi)間(jian)信(xin)號(hao)傳(chuan)輸，對光(guang)(guang)(guang)(guang)(guang)(guang)纖(xian)(xian)(xian)(xian)線(xian)纜進行檢測(ce)(ce)(ce)也是(shi)必不可(ke)少(shao)的(de)(de)(de)(de)(de)(de)環節。對于(yu)光(guang)(guang)(guang)(guang)(guang)(guang)纖(xian)(xian)(xian)(xian)的(de)(de)(de)(de)(de)(de)維(wei)護，工(gong)(gong)程人員必須(xu)使用專(zhuan)業的(de)(de)(de)(de)(de)(de)光(guang)(guang)(guang)(guang)(guang)(guang)纖(xian)(xian)(xian)(xian)測(ce)(ce)(ce)試儀表，如(ru)光(guang)(guang)(guang)(guang)(guang)(guang)源(yuan)(yuan)、光(guang)(guang)(guang)(guang)(guang)(guang)功(gong)率(lv)(lv)計(ji)、OTDR等(deng)(deng)。穩(wen)定(ding)(ding)光(guang)(guang)(guang)(guang)(guang)(guang)源(yuan)(yuan)是(shi)專(zhuan)門用來發(fa)(fa)出(chu)高(gao)(gao)穩(wen)定(ding)(ding)功(gong)率(lv)(lv)值的(de)(de)(de)(de)(de)(de)雷射(she)(she)光(guang)(guang)(guang)(guang)(guang)(guang)，雷射(she)(she)光(guang)(guang)(guang)(guang)(guang)(guang)經光(guang)(guang)(guang)(guang)(guang)(guang)纖(xian)(xian)(xian)(xian)傳(chuan)輸后(hou)有一定(ding)(ding)的(de)(de)(de)(de)(de)(de)衰減(jian)，通過光(guang)(guang)(guang)(guang)(guang)(guang)功(gong)率(lv)(lv)計(ji)測(ce)(ce)(ce)量(liang)(liang)(liang)經光(guang)(guang)(guang)(guang)(guang)(guang)纖(xian)(xian)(xian)(xian)傳(chuan)輸后(hou)的(de)(de)(de)(de)(de)(de)功(gong)率(lv)(lv)值，計(ji)算出(chu)光(guang)(guang)(guang)(guang)(guang)(guang)纖(xian)(xian)(xian)(xian)損耗(hao)值是(shi)多(duo)少(shao)dB。測(ce)(ce)(ce)量(liang)(liang)(liang)光(guang)(guang)(guang)(guang)(guang)(guang)纖(xian)(xian)(xian)(xian)耗(hao)時，必須(xu)用光(guang)(guang)(guang)(guang)(guang)(guang)源(yuan)(yuan)和光(guang)(guang)(guang)(guang)(guang)(guang)功(gong)率(lv)(lv)計(ji)配對使用，才能準備(bei)計(ji)算出(chu)光(guang)(guang)(guang)(guang)(guang)(guang)纖(xian)(xian)(xian)(xian)損耗(hao)；而OTDR是(shi)用來測(ce)(ce)(ce)量(liang)(liang)(liang)光(guang)(guang)(guang)(guang)(guang)(guang)纖(xian)(xian)(xian)(xian)的(de)(de)(de)(de)(de)(de)斷點位(wei)置的(de)(de)(de)(de)(de)(de)儀器，它探測(ce)(ce)(ce)光(guang)(guang)(guang)(guang)(guang)(guang)纖(xian)(xian)(xian)(xian)大(da)概在多(duo)少(shao)公(gong)里處斷開，但(dan)OTDR的(de)(de)(de)(de)(de)(de)造(zao)價(jia)太高(gao)(gao)，規(gui)模(mo)較小(xiao)的(de)(de)(de)(de)(de)(de)工(gong)(gong)程商可(ke)以采用光(guang)(guang)(guang)(guang)(guang)(guang)纖(xian)(xian)(xian)(xian)尋障儀來測(ce)(ce)(ce)量(liang)(liang)(liang)斷點位(wei)置。對于(yu)小(xiao)規(gui)模(mo)的(de)(de)(de)(de)(de)(de)工(gong)(gong)程商，最需要(yao)的(de)(de)(de)(de)(de)(de)光(guang)(guang)(guang)(guang)(guang)(guang)纖(xian)(xian)(xian)(xian)測(ce)(ce)(ce)量(liang)(liang)(liang)工(gong)(gong)具(ju)就(jiu)是(shi)光(guang)(guang)(guang)(guang)(guang)(guang)功(gong)率(lv)(lv)計(ji)，因為長距離的(de)(de)(de)(de)(de)(de)光(guang)(guang)(guang)(guang)(guang)(guang)纜通常是(shi)電信(xin)運營商或廣電系(xi)統(tong)(tong)(tong)進維(wei)護，小(xiao)規(gui)模(mo)的(de)(de)(de)(de)(de)(de)工(gong)(gong)程商只(zhi)需要(yao)測(ce)(ce)(ce)量(liang)(liang)(liang)光(guang)(guang)(guang)(guang)(guang)(guang)纖(xian)(xian)(xian)(xian)設(she)備(bei)的(de)(de)(de)(de)(de)(de)功(gong)率(lv)(lv)和光(guang)(guang)(guang)(guang)(guang)(guang)纖(xian)(xian)(xian)(xian)損耗(hao)，找出(chu)問題所在就(jiu)足夠了(le)。

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