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id="app_42532013_style" class="hide"> </div> <div id="h7msac9gc" class="appWrapper" id="app_42532013" role="draggable" data-type="app" data-appid="datumInfo" data-config="" data-state="true"> <div id="h7msac9gc" class="appMask"></div> <div id="h7msac9gc" class="appContent"> <div id="h7msac9gc" class="datum_info"> <h1 class="title">噪聲檢測(cè)簡(jiǎn)單介紹</h1> <div id="h7msac9gc" class="bgcolor_01"> <div id="h7msac9gc" class="bgcolor_sum"> <div id="h7msac9gc" class="left">日期：2024-10-12 04:18</div> <div id="h7msac9gc" class="right">瀏覽次數(shù)：629</div> </div> <div id="h7msac9gc" class="bgcolor_sum01"> 摘要： </div> </div> <div id="h7msac9gc" class="content"> 鐵磁材料由許多小的磁疇組成，磁疇之間由疇壁分割開(kāi)。<a href="http:///safehbkj_Product_16727037.html" class="keyword_inherit" name="keyword_inherit" target="_blank">噪聲檢測(cè)</a>在外磁場(chǎng)作用下,磁疇壁發(fā)生位移或磁疇轉(zhuǎn)動(dòng),使疇壁兩邊磁疇的磁化方向趨向外磁場(chǎng)方向的疇擴(kuò)大，反向磁化的疇縮小,材料就呈現(xiàn)出磁化狀態(tài)。<div> 經(jīng)初始磁化后，噪聲檢測(cè)在進(jìn)一步的磁化過(guò)程中，疇壁位移須克服材料內(nèi)部存在的不均勻應(yīng)力、雜質(zhì)、空穴等因素造成的勢(shì)能壘,因而為非連續(xù)的、跳躍式的不可逆運(yùn)動(dòng)。磁化曲線和磁滯回線*陡的區(qū)域?yàn)殡A梯式跳躍性的變化,垂直段表示跳躍的大小,水平段為兩次跳躍之間等待的時(shí)間。磁疇和疇壁的這種不連續(xù)跳躍，稱為巴克好森跳躍。</div><div> 若將一導(dǎo)體線圈置于材料表面,并對(duì)材料施加一交變磁化場(chǎng)，則材料疇壁的不可逆跳躍將在線圈內(nèi)感應(yīng)出一系列的電壓脈沖信號(hào),經(jīng)放大后通過(guò)擴(kuò)音器可聽(tīng)到沙沙的噪聲。</div><div> 這一現(xiàn)象首先是德國(guó)物理學(xué)家Barkhausen 于1919年巴克好森發(fā)現(xiàn)的，故稱巴克好森效應(yīng)，相應(yīng)的磁噪聲稱為磁巴克好森噪聲，簡(jiǎn)稱MBN。 </div><div>巴克好森檢測(cè)法主要應(yīng)用于以下方面：</div><div> (1) 鋼鐵材料和構(gòu)件殘余應(yīng)力的檢測(cè)，如熱處理、焊接、使用變形等引致的殘余應(yīng)力。</div><div> (2) 鋼鐵材料顯微組織變化的檢測(cè),如淬火、回火、滲碳、滲氮等各種熱處理過(guò)程導(dǎo)致的組織結(jié)構(gòu)、硬度的變化,熱處理缺陷的判斷，硬度及硬化層深度的判斷等。</div> (3) 檢測(cè)應(yīng)力和顯微組織變化相聯(lián)系的綜合效應(yīng),如材料表面的熱處理缺陷、機(jī)加工磨削灼傷缺陷、材料疲勞的軟化和硬化以及疲勞壽命的預(yù)測(cè)等。 </div> <div id="h7msac9gc" class="datumrelate"> <span>下一篇：</span> <a href="/safehbkj_Article_11383155.html" title="污染源電磁輻射檢測(cè)方法簡(jiǎn)述">污染源電磁輻射檢測(cè)方法簡(jiǎn)述</a> <br> 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