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class="nr_main_box"> <h1 class="inside_rnewtil">管線探測(cè)儀在使用中常見問(wèn)題解答</h1> <div id="1571n5fppxr7" class="inside_rnewtime">點(diǎn)擊次數(shù)：706 更新時(shí)間：2023-09-15</div> <div id="1571n5fppxr7" class="inside_rnewcon"><p><span style="font-size: 16px;"><strong>管線探測(cè)儀在使用中常見問(wèn)題解答</strong></span></p><p><span style="font-size: 16px;"><strong></strong></span></p><p style="line-height:150%"><span style="font-size: 16px;"><strong><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">問(wèn)：探測(cè)過(guò)程中干擾是如何產(chǎn)生的？</span></strong><strong><span style="font-family: Calibri; line-height: 150%; font-size: 19px;"> </span></strong><strong></strong></span></p><p style="line-height:150%"><span style="font-size: 16px;"><strong><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">答：</span></strong><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">直埋電纜測(cè)試儀是探測(cè)目標(biāo)金屬管線上的施加信號(hào)電流產(chǎn)生的電磁場(chǎng)。在理想情況下電磁場(chǎng)的形狀應(yīng)是標(biāo)準(zhǔn)的同心圓。干擾的產(chǎn)生最常見的原因是目標(biāo)管線上的信號(hào)耦合到鄰近的管線上。被干擾的電磁場(chǎng)是一個(gè)變形的電磁場(chǎng)，從而造成讀數(shù)不準(zhǔn)確。發(fā)射頻率越高相鄰管線的干擾就越大。</span></span></p><p style="line-height:150%"><span style="font-size: 16px;"><strong><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">問(wèn)：為什么我在其它的管線上探測(cè)到干擾信號(hào)？</span></strong><strong><span style="font-family: Calibri; line-height: 150%; font-size: 19px;"> </span></strong><strong></strong></span></p><p style="line-height:150%"><span style="font-size: 16px;"><strong><span style="font-family: 宋體; line-height: 150%; font-size: 19px;"><span style="font-size: 16px; font-family: 宋體;">答：</span> </span></strong><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">這種情況是由于發(fā)射機(jī)施加的信號(hào)，通過(guò)公共接地點(diǎn)使信號(hào)分流到了其他管線上或互感耦合到了其它管線上。這時(shí)最好使用直接連接法施加信號(hào)，或更換信號(hào)施加點(diǎn)，并使用較低的頻率（低頻）。</span></span></p><p style="line-height:150%"><span style="font-size: 16px;"><strong><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">問(wèn)：如何用谷值法驗(yàn)證峰值法定位的準(zhǔn)確性？</span></strong><strong><span style="font-family: Calibri; line-height: 150%; font-size: 19px;"> </span></strong><strong></strong></span></p><p style="line-height:150%"><span style="font-size: 16px;"><strong><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">答：</span></strong><span style="font-family: 宋體; line-height: 150%; font-size: 19px;"><span style="font-size: 16px; font-family: 宋體;">對(duì)于理想的無(wú)干擾管線，波峰</span><span style="font-size: 16px; font-family: Calibri;">/</span><span style="font-size: 16px; font-family: 宋體;">波谷法定位的位置是重合的。但對(duì)于有并行管線或有其它干擾時(shí)，波峰</span><span style="font-size: 16px; font-family: Calibri;">/</span><span style="font-size: 16px; font-family: 宋體;">波谷法定位的位置就會(huì)不重合。此時(shí)的管線真正位置在波峰值一側(cè)。當(dāng)干擾嚴(yán)重時(shí)可能找不到零值點(diǎn)，此時(shí)只能根據(jù)峰值位置大概給出管線的位置。最好采取改變施加信號(hào)的方法，重新進(jìn)行管線定位。當(dāng)波峰</span><span style="font-size: 16px; font-family: Calibri;">/</span><span style="font-size: 16px; font-family: 宋體;">波谷法所測(cè)位置不重合時(shí)，管線直讀測(cè)深也會(huì)有較大偏差，甚至無(wú)法讀出深度。</span></span></span></p><p style="line-height:150%"><span style="font-size: 16px;"><strong><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">問(wèn)：有什么方法可以減少管線電磁場(chǎng)形態(tài)的變形？</span></strong><strong><span style="font-family: Calibri; line-height: 150%; font-size: 19px;"> </span></strong><strong></strong></span></p><p style="line-height:150%"><span style="font-size: 16px;"><strong><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">答：</span></strong><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">首先，你可以試著降低發(fā)射機(jī)的輸出功率，有時(shí)信號(hào)太強(qiáng)，探測(cè)的效果不一定最好，尤其是多根管線并行、非常接近的情況下。如果使用的是感應(yīng)法，這時(shí)可以改用直接連接法或夾鉗法施加信號(hào)。這們可以減少耦合到其它管線的信號(hào)，從而減少管線電磁場(chǎng)形態(tài)的變形。如果，發(fā)現(xiàn)谷值法和峰值法定位不一致，換一個(gè)一致的地方進(jìn)行定位，如果找不到一致的地方，我們通常以峰值位置做為管線的位置，深度測(cè)量也在峰值模式下進(jìn)行，當(dāng)然也存在一定的誤差，但比谷值法更接近真實(shí)值。</span><span style="font-family: Calibri; line-height: 150%; font-size: 19px;"> </span></span></p><p style="line-height:150%"><span style="font-size: 16px;"><strong><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">問(wèn)：該設(shè)備是否可同時(shí)用來(lái)探測(cè)銅線電纜和光纜？</span></strong><strong><span style="font-family: Calibri; line-height: 150%; font-size: 19px;"> </span></strong><strong></strong></span></p><p style="line-height:150%"><span style="font-size: 16px;"><strong><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">答：</span></strong><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">目前的地下路燈管線探測(cè)儀只能探測(cè)帶有金屬護(hù)套或芯線的電纜。只有帶有金屬護(hù)套或中央金屬加強(qiáng)芯的光纜才能用地下管線探測(cè)到。要探測(cè)電纜必須給導(dǎo)體施加一個(gè)可以探測(cè)的信號(hào)（發(fā)射機(jī)信號(hào)）。</span><span style="font-family: Calibri; line-height: 150%; font-size: 19px;"> </span></span></p><p style="line-height:150%"><span style="font-size: 16px;"><strong><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">問(wèn)：為什么我的接收機(jī)測(cè)深不準(zhǔn)確？</span></strong><strong><span style="font-family: Calibri; line-height: 150%; font-size: 19px;"> </span></strong><strong></strong></span></p><p style="line-height:150%"><span style="font-size: 16px;"><strong><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">答：</span></strong><span style="font-family: Calibri; line-height: 150%; font-size: 19px;">1.</span><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">檢查是否選擇了正確的工作模式，應(yīng)選擇峰值模式。</span></span></p><p style="text-indent:37px;line-height:150%"><span style="font-size: 16px;"><span style="font-family: Calibri; line-height: 150%; font-size: 19px;">2.</span><span style="font-family: 宋體; line-height: 150%; font-size: 19px;"><span style="font-size: 16px; font-family: 宋體;">檢查峰值法和谷值法定位的位置是否一致。直讀測(cè)深的方法雖然簡(jiǎn)單，但讀取正確結(jié)果需要一定的條件，否則測(cè)量精度不高，甚至得到錯(cuò)誤結(jié)果。應(yīng)用直讀測(cè)深的條件之一是此時(shí)的峰零值要基本重合，否則誤差會(huì)很大。其二是直讀的深度要經(jīng)過(guò)校正才能達(dá)到較高的可靠性，校正的因素包含：管線埋設(shè)土壤的濕度，以及檢測(cè)信號(hào)的頻率，一般土壤濕度越大、檢測(cè)頻率越高，校正的系數(shù)就應(yīng)越小，一般在</span><span style="font-size: 16px; font-family: Calibri;">0.8-0.95</span><span style="font-size: 16px; font-family: 宋體;">之間。簡(jiǎn)單的辦法是找一個(gè)深度已知且無(wú)干擾的管段，測(cè)出直讀深度，與實(shí)際埋深相比求的校正系數(shù)。</span></span></span></p><p style="text-indent:37px;line-height:150%"><span style="font-family: 宋體; line-height: 150%; font-size: 16px;"><span style="line-height: 150%; font-size: 16px; font-family: Calibri;">3</span>．測(cè)量埋深時(shí)要注意接收機(jī)的方向，盡量使接收機(jī)的線圈與管線走向垂直，這個(gè)要求可以通過(guò)輕微轉(zhuǎn)動(dòng)接收機(jī)，使面板上的顯示讀數(shù)達(dá)到最大值來(lái)達(dá)到。此外，還應(yīng)注意：直讀埋深值是接收機(jī)機(jī)身地面到管道中心的距離。</span></p><p style="line-height:150%"><span style="font-size: 16px;"><strong><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">問(wèn)：遇到信號(hào)強(qiáng)度突然減弱是何原因？</span></strong><strong></strong></span></p><p style="line-height:150%"><span style="font-size: 16px;"><strong><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">答：</span></strong><span style="font-family: 宋體; line-height: 150%; font-size: 19px;"><span style="font-size: 16px; font-family: 宋體;">如果電流測(cè)量值突然減小，可能是經(jīng)過(guò)了</span><span style="font-size: 16px; font-family: Calibri;">T</span><span style="font-size: 16px; font-family: 宋體;">型分叉或分支管。在區(qū)域內(nèi)進(jìn)行</span><span style="font-size: 16px; font-family: Calibri;">360</span><span style="font-size: 16px; font-family: 宋體;">度掃描，查找其他中心線，以確認(rèn)導(dǎo)體是否有分支。如果深度值和信號(hào)強(qiáng)度發(fā)生變化，這時(shí)應(yīng)檢查電流測(cè)量值，如果電流測(cè)量值保持不變，則說(shuō)明仍在目標(biāo)管線上方，只是由于地下金屬管線的深度發(fā)生了改變。電流測(cè)量值可以幫助使用者確定是地下金屬管線的深度變化造成了探測(cè)的信號(hào)強(qiáng)度的變化。</span></span></span></p><p style="line-height: 150%"><span style="font-size: 16px;"><strong><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">問(wèn)：如果感應(yīng)信號(hào)感應(yīng)到</span></strong><strong><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">到其他管線上怎么辦？</span></strong><strong></strong></span></p><p style="line-height: 150%"><span style="font-size: 16px;"><strong><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">答：</span></strong><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">可以采用以下辦法：</span></span></p><p style="margin-left: 24px;line-height: 150%"><span style="font-size: 16px;"><span style="font-family: 宋體; font-size: 19px;">1、 </span><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">調(diào)低頻率</span></span></p><p style="margin-left: 24px;line-height: 150%"><span style="font-size: 16px;"><span style="font-family: 宋體; font-size: 19px;">2、 </span><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">調(diào)低功率</span></span></p><p style="margin-left: 24px;line-height: 150%"><span style="font-size: 16px;"><span style="font-family: 宋體; font-size: 19px;">3、 </span><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">如果可能使用直連法或夾鉗</span></span></p><p style="margin-left: 24px;line-height: 150%"><span style="font-size: 16px;"><span style="font-family: 宋體; font-size: 19px;">4、 </span><span style="line-height: 150%; font-size: 16px; font-family: 宋體;">把接地插到遠(yuǎn)離目標(biāo)管線和其他埋地管線的地方</span></span></p><p style="margin-left: 24px;line-height: 150%"><span style="font-size: 16px;"><span style="font-family: 宋體; font-size: 19px;">5、 </span><span style="line-height: 150%; font-size: 16px; font-family: 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