【摘要】：核磁共振超前探測在隧道中因受到支護架的影響,使發(fā)射電流減小,影響激發(fā)場的建立和信號的接收,以至于探測結(jié)果不精確。為了定量討論這種影響,通過分析支護架與探測線圈物理關(guān)系、電磁場相互影響等,建立了變壓器模型。簡化電路模型,利用基爾霍夫電流定律建立核磁共振發(fā)射線圈的電阻增量、電感減量與隧道支護架電阻、電感的關(guān)系公式,得知發(fā)射電流增加和減少的量化分析。分析支護架與發(fā)射線圈的位置關(guān)系,推導(dǎo)出支護架與發(fā)射線圈的互感系數(shù)公式,根據(jù)電阻增量、電感減量以及支護架與發(fā)射線圈的互感系數(shù),可以得到支護架的電阻以及電感。通過實驗論證,實測結(jié)果與理論結(jié)果相吻合,這對后續(xù)反演提供了依據(jù)。
[Abstract]:The advance detection of nuclear magnetic resonance (NMR) in the tunnel is affected by the support frame, which reduces the emission current and affects the establishment of the excitation field and the reception of the signal, so that the detection results are not accurate. In order to quantitatively discuss this influence, the transformer model is established by analyzing the physical relationship between the support frame and the detection coil, the interaction of electromagnetic field and so on. The circuit model is simplified, and the relationship between the resistance increment of nuclear magnetic resonance emission coil, inductance reduction and tunnel support resistance and inductance is established by using Kirchhoff current law, and the quantitative analysis of the increase and decrease of emission current is obtained. The position relationship between the support frame and the transmitting coil is analyzed, and the formula of the mutual inductance coefficient between the support frame and the transmitting coil is derived. according to the resistance increment, inductance reduction and the mutual inductance coefficient between the support frame and the transmitting coil, the resistance and inductance of the support frame can be obtained. The experimental results show that the measured results are in good agreement with the theoretical results, which provides a basis for subsequent inversion.
【作者單位】： 吉林大學(xué)地球信息探測儀器教育部重點實驗室 儀器科學(xué)與電氣工程學(xué)院;
【基金】：科技部科技創(chuàng)新工作方法項目(3B810Z950537) 國家重大科學(xué)儀器設(shè)備開發(fā)專項(2011YQ030133)
【分類號】：U452.1

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