TEM中心回线中—远带响应特征
蒋邦远
中国地质科学院 地球物理地球化学勘查研究所,河北 廊坊 065000
AN ANALYSIS OF THE RESPONSE CHARACTERISTICS OF THE MEDIUMDISTAL ZONE OF TEM CENTRAL LOOP
JIANG Bang-Yuan
Institue of Geophysical and Geochemical Exploration CAGS, Langfang 065000,China
摘要 近20年来,中心回线观测已进入全域时段,然而有关中—远带响应特征的文章极为少见,致使用户困惑,比如晚延时响应
值大于早延时响应值(ε-上凸)、在同一测点2种仪器系统观测结果相差太大等。对此笔者做了详细分析。结果表明,中—远带响应
特征基本为4种,ε-上凸只是其中之一,导致所测响应出现差别的主要原因是接收线圈延时。因此,若工作于中—远带,必须确切
测定线圈延时,合理选择发射回线边长。
Abstract : Central loop measurement has covered the full zone in the past 20 years. Nevertheless, articles dealing
with response features of the mediumdistal zone are very insufficient, which has caused perplexity among the
users, for example, the late delay response value is larger than the early delay response value (ε-overshoot);the
results observed by two sorts of instruments are considerably different from each other at the same measuring
point. These problems have been analyzed in detail in this paper, and the results show that there basically exist
four basic response features in the mediumdistal zone, and the "ε-overshoot" is only one of them. The intensity
distortional response is caused by the receiver coil delay. Therefore, the coil character should be exactly known
and the transmitter loop length should be carefully selected before the performance of the survey in the field.
收稿日期: 2009-02-20
出版日期: 2010-04-10
通讯作者:
蒋邦远(1931-),男,教授级高工,政府特贴获得者,1952年南京大学物理系毕业,长期从事电磁法研究。
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