An Illustrative Approach to Estimating the Near-Surface TEM System Potentialities

Kozhevnikov, N.O.; Nikiforov, S. P.

doi:10.3997/2214-4609-pdb.5.d043

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“…Известны различные методики оценки измерительной системы, применяемые как в лабораторных, так и полевых условиях (Foged et al, 2013;Sapial et al, 2015;Zakharkin, Tarlo, 1999;Kozhevnikov, 2012). В большинстве случаев пристальное внимание при изучении собственного отклика измерительной системы уделяется процессам, происходящим на ранних временах, и, соответственно, оказывающим наибольшее влияние при изучении ВЧР (Kozhevnikov, Nikiforov, 2002). Некоторые результаты наших исследований, посвященных тестированию измерительных систем на ранних временах, отражены в работе (Sharlov et al, 2017c).…”

Section: Introductionunclassified

Influence of the Intrinsic Response of the Measuring System to the Tem Measurement Results

Sharlov¹,

Kozhevnikov²

2019

Engineering and Mining Geophysics 2019 15th Conference and Exhibition

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We discuss decrease in the decay rate of the TEM voltage response in cases when TEM soundings are performed using central loop arrays with small-size transmitter loops. We show that the cause of the slowly decaying central loop TEM voltage response is the intrinsic transient response of the measuring amplifier. This effect is the more noticeable the smaller the transmitter loop and/or the more resistive the ground. The effect is not observed when the receiver loop is located outside the transmitter loop. Inversion of the late time TEM response without regards to the intrinsic response of measuring unit results in appearance of nonexistent conductive ground layers and thus in misinterpretation of the TEM data. To reduce the intrinsic transient response of the measuring amplifier, the following may be useful: reduction of the latest measurement time, subtracting the intrinsic transient response from the total one, disconnection of the amplifier from the receiver loop during the current turnoff in the transmitter loop.

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Section: Introductionunclassified

Influence of the Intrinsic Response of the Measuring System to the Tem Measurement Results

Sharlov¹,

Kozhevnikov²

2019

Engineering and Mining Geophysics 2019 15th Conference and Exhibition

View full text Add to dashboard Cite

show abstract

An Illustrative Approach to Estimating the Near-Surface TEM System Potentialities

Cited by 1 publication

References 0 publications

Influence of the Intrinsic Response of the Measuring System to the Tem Measurement Results

Influence of the Intrinsic Response of the Measuring System to the Tem Measurement Results

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