以有限元仿真實(shí)驗(yàn)為基礎(chǔ), 通過高介電常數(shù)介質(zhì)在ECT 傳感器內(nèi)不同分布時(shí)靈敏場的比較研究, 結(jié)果表明, 傳感器內(nèi)部各處靈敏度變化不僅與管內(nèi)高介電常數(shù)介質(zhì)的大小和分布有關(guān), 還與該點(diǎn)在靈敏場中所處的位置有關(guān)?？偨Y(jié)一般規(guī)律為:高介電常數(shù)介質(zhì)所在的區(qū)域以及附近的區(qū)域靈敏度變化最大; 越靠近電極附近的區(qū)域靈敏度的變化越大; 高介電常數(shù)介質(zhì)對靈敏場的影響在傳感器內(nèi)部呈馬鞍形分布。
關(guān)鍵詞　層析成像　有限元　靈敏場　傳感器
Abstract　U sing finite element method, the sensit ivity dist ribut ions under different dist ribut ions of h igh dielec2 t ric substance were calculated1By comparing these sensit ivity dist ribut ions, found that the disto rt ion of the sensi2 t ivity dist ribut ion has relat ions w ith the size of sect ion of the substance, it s po sit ion in the ECT senso r and also it s po sit ion in the sensit ivity dist ribut ion1The disto rt ion is the heaviest where the h igh dielect ric substance is lo2 cated1The disto rt ion is mo re heavier when the substance near to the ECT elect rode1The disto rt ion of the sensi2 t ivity dist ribut ion by h igh dielect ric substance is like a saddle1
Key words　Tomography　F inite element　Sensit ivity dist ribut ion　Senso r