【摘要】：核磁共振超前探測(cè)在隧道中因受到支護(hù)架的影響,使發(fā)射電流減小,影響激發(fā)場(chǎng)的建立和信號(hào)的接收,以至于探測(cè)結(jié)果不精確。為了定量討論這種影響,通過(guò)分析支護(hù)架與探測(cè)線(xiàn)圈物理關(guān)系、電磁場(chǎng)相互影響等,建立了變壓器模型。簡(jiǎn)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(xiàn)圈的電阻增量、電感減量與隧道支護(hù)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(hù)架與發(fā)射線(xiàn)圈的位置關(guān)系,推導(dǎo)出支護(hù)架與發(fā)射線(xiàn)圈的互感系數(shù)公式,根據(jù)電阻增量、電感減量以及支護(hù)架與發(fā)射線(xiàn)圈的互感系數(shù),可以得到支護(hù)架的電阻以及電感。通過(guò)實(shí)驗(yàn)論證,實(shí)測(cè)結(jié)果與理論結(jié)果相吻合,這對(duì)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(cè)儀器教育部重點(diǎn)實(shí)驗(yàn)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(xiàng)目(3B810Z950537) 國(guó)家重大科學(xué)儀器設(shè)備開(kāi)發(fā)專(zhuān)項(xiàng)(2011YQ030133)
【分類(lèi)號(hào)】：U452.1

【相似文獻(xiàn)】

相關(guān)期刊論文 前6條

1 叢廣巖;高速公路交通安全設(shè)施及新產(chǎn)品的應(yīng)用與實(shí)踐[J];公路;1999年05期

2 張偉東,孫韶峰,朱德功;立交橋梁防沖撞裝置的設(shè)計(jì)與使用[J];鐵道建筑;2003年01期

3 ;浮式防波堤的應(yīng)用[J];水運(yùn)工程;1977年08期

4 唐坤明;先張梁現(xiàn)場(chǎng)預(yù)制施工技術(shù)[J];西部探礦工程;1999年S1期

5 柴春明;先張法預(yù)應(yīng)力空心板梁施工技術(shù)[J];山西建筑;2001年01期

6 洪流,陳彬;拱橋拱箱纜索吊裝的施工控制[J];公路交通技術(shù);2004年05期

，

本文編號(hào)：2494714