CAJ | 학술논문

通过对大定源瞬变电磁激励一次场理论解析计算，分析了不同偏移距、不同规格线框一次场的分布及衰减规律。结果表明：近中心一定偏移距、一定深度范围内一次场大于中心点处一次场，且偏移距越大一次场越强，衰减也越快；超过这个深度一次场比中心处一次场小。当偏移距大到一定程度时，一次场的衰减与近中心处的衰减不同，此时边框效应严重，对浅层信号和长宽比大的矩形框影响较大。对与目标体共深度一次场相差在5%以内的区域的研究，解决了有效勘探范围的量化确定问题。
통과대대정원순변전자격려일차장이론해석계산，분석료불동편이거、불동규격선광일차장적분포급쇠감규률。결과표명：근중심일정편이거、일정심도범위내일차장대우중심점처일차장，차편이거월대일차장월강，쇠감야월쾌；초과저개심도일차장비중심처일차장소。당편이거대도일정정도시，일차장적쇠감여근중심처적쇠감불동，차시변광효응엄중，대천층신호화장관비대적구형광영향교대。대여목표체공심도일차장상차재5%이내적구역적연구，해결료유효감탐범위적양화학정문제。
Through the calculation of the primary field of transient electromagnetic method with the large fixed loop, the distribution and delay features of the primary field of different offset and different loop size were analyzed. The results of the research demonstrate that the early primary field was greater than that in the center within certain depth range, the more the offset within certain range is, the more the primary field and the more depth rate from ground to this depth are. Over this depth, the primary field of the center is the largest, when the offset is increased to some extent, the delay features of the different offset are different;rim effect has great influence on signals of shallow layer and the big length-width ratio rectangular loop. Finally, the study in the area where the target has the same depth and the error of primary field is no more than 5%solved the problem of how to delineate effective exploration area.