21000-16-10-20-035-03-02本特利位移探頭殼體組件
探頭即傳感器的再封裝形式，是把傳感器的基本單元，通過(guò)合理的電子電路與外部封裝結(jié)構(gòu)，對(duì)傳感器進(jìn)行封裝，使它具有我們所需的一些功能的部件，他和傳感器一樣，通常根據(jù)其基本感知功能分為熱敏探頭、光敏探頭、氣敏探頭、力敏探頭、磁敏探頭、濕敏探頭、聲敏探頭、放射線(xiàn)探頭、色敏探頭和味敏探頭、探頭等幾大類(lèi)。
有諧振式傳感器、寬帶傳感器、水型傳感器、高溫傳感器、低溫傳感器等其他功能型的傳感器。探頭在電渦流傳感器系統(tǒng)中發(fā)揮重要的作用。未能做好探頭的安裝，以至于探頭距離金屬體過(guò)近或?qū)щ婓w面積過(guò)小，將導(dǎo)致渦流的形成受到影響。因此在實(shí)際檢修作業(yè)時(shí)，還應(yīng)加強(qiáng)機(jī)組保護(hù)儀表探頭的安裝與維護(hù)，以機(jī)組的運(yùn)行能夠得到監(jiān)控。
探頭的前置器一般提供探頭需要的電源，對(duì)信號(hào)進(jìn)行放大、檢波和濾波等。
電渦流位移傳感器的探頭線(xiàn)圈接受前置器振蕩電路來(lái)的高頻電流，在其周?chē)a(chǎn)生高頻磁場(chǎng)，該磁場(chǎng)穿過(guò)靠近它的轉(zhuǎn)軸金屬表面，在其中產(chǎn)生一個(gè)電渦流，該電渦流產(chǎn)生的磁場(chǎng)方向和線(xiàn)圈磁場(chǎng)方向相反，改變了原線(xiàn)圈的感抗，該感抗的變化隨探頭頂部金屬表面的間隙變化而變化。
前置器檢測(cè)電路檢測(cè)探頭線(xiàn)圈的感抗變化。再經(jīng)放大電路將感抗變化量變換放大成相應(yīng)電壓變化信號(hào)輸出。經(jīng)監(jiān)測(cè)儀進(jìn)行轉(zhuǎn)換，根據(jù)測(cè)量的要求將其輸出電壓的直流部分用做位移量的檢測(cè)，交流部分用做振動(dòng)值的檢測(cè)。
本特利Bently接近探頭外殼組件
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