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    光纖熔接技術的操作與技巧

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    文章出處:唯康信息
    發表時間:2019-08-16
           光纖熔接主要分為四個步驟:剝、切、熔、護。
           剝:是指將光纜中的光纖芯剝離出來,這其中包括了最外層的塑料層,中間的鋼絲,內層中的塑料層及光纖表面的顏色油漆層。
          切:是指將剝好準備熔接的光纖的端面用“切割機”切齊。
          熔:是指將兩根光纖在“熔接機”中熔接到一起。
          護:是指將已經熔接好的光纖接頭部分用“熱縮管”保護起來。
    一、端面的制備
          光纖端面的制備包括剝覆、清潔和切割這幾個環節。合格的光纖端面是熔接的必要條件,端面質量直接影響到熔接質量。
    (1) 光纖涂面層的剝除
          熟練掌握平、穩、快三字剝纖法。“平”,即持纖要平。左手拇指和食指捏緊光纖,使之成水平狀,所露長度以5cm為它,余纖在無名指、小拇指之間自然打彎,以增加力度,防止打滑。
    (2)裸纖的清潔
          觀察光纖剝除部分的涂覆層是否全部剝除,若有殘留應重剝。如有極少量不易剝除的涂覆層,可用棉球沾適量酒精,邊浸漬,邊逐步擦除。一塊棉花使用2~3次后要及時更換,每次要使用棉花的不同部位和層面。
    (3)裸纖的切割
          切刀的選擇切刀有手動和電動兩種。前者操作簡單,性能可靠,隨操作者水平的提高,切割效率和質量可大幅度提高,且要求裸纖較短,但該切刀對環境溫差要求較高。后者切割質量較高,適宜在野外寒冷條件下作業,但操作較復雜,工作速度恒定,要求裸纖較長。熟練的操作者在常溫下進行快速光纜接續或搶險,采用手動切刀為宜;反之,初學者或在野外較寒冷條件下作業時,直用電動切刀。
           首先要清潔切刀和調整切刀位置,切刀的擺放要平穩,切割時,動作要自然、平穩,勿重、勿急,避免斷纖、斜角、毛刺、裂痕等不良端面的產生。另外合理分配和使用自己的右手手指,使之與切刀的具體部件相對應、協調,提高切割速度和質量。
          謹防端面污染熱縮套管應在剝覆前穿入,嚴禁在端面制備后穿入。裸纖的清潔、切割和熔接的時間應緊密銜接,不可間隔過長,特別是已制備的端面切勿放在空氣中。移動時要輕拿輕放,防止與其它物件擦碰。在接續中,應根據環境,對切刀“V”形槽、壓板、刀刃進行清潔,謹防端面污染。
    二、光纖熔接
    (1)熔接機的選擇
          熔接機的選擇應根據光纜工程要求配備蓄電池容量和精密度合適的熔接設備。
    (2)熔接機參數設定
          熔接程序熔接前根據光纖的材料和類型,設置好最佳預熔主熔電流和時間及光纖送入量等關鍵參數。
          熔接過程中還應及時清潔熔接機“V”形槽、電極、物鏡、熔接室等,隨時觀察熔接中有無氣泡、過細、過粗、虛熔、分離等不良現象,注意OTDR跟蹤監測結果,及時分析產生上述不良現象的原因,采取相應的改進措施。
    三、盤纖
           科學的盤纖方法,可使光纖布局合理、附加損耗小、經得住時間和惡劣環境的考驗,可避免擠壓造成的斷纖現象。
    (1)盤纖規則
          沿松套管或光纜分枝方向為單位進行盤纖,前者適用于所有的接續工程;后者僅適用于主干光纜末端,且為一進多出。分支多為小對數光纜。該規則是每熔接和熱縮完一個或幾個松套管內的光纖、或一個分技方向光纜內的光纖后,盤纖一次。優點:避免了光纖松套管間或不同分枝光纜間光纖的混亂,使之布局合理,易盤、易拆,更便于日后維護。
    (2)盤纖的方法
           先中間后兩邊,即先將熱縮后的套管逐個放置于固定槽中,然后再處理兩側余纖。優點:有利于保護光纖接點,避免盤纖可能造成的損害。在光纖預留盤空間小,光纖不易盤繞和固定時,常用此種方法。
     
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    唯康

    光纖熔接

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