1887

Abstract

An electromagnetic system was developed<br>using some parts of an old Slingram ABEM EM35/88<br>as transmitter and receiver coils and matching<br>transformers. Modern circuits with low noise lock-in<br>amplifiers and analog multiplier were used to detect<br>signal from a high magnetic permeability receiver<br>coil. In phase and quadrature voltage of lock-in<br>amplifiers outputs were achieved using square<br>waveform reference from the transmitter coil circuit.<br>Comparison of these voltage by a precise analog<br>multiplier give us the electrical apparent conductive<br>of the overburden layer (conductor). One third lock-in<br>circuit was used to adjust the spacing intercoil by<br>nulling the total field component.

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/content/papers/10.3997/2214-4609-pdb.217.020
2001-10-28
2021-10-17
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http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609-pdb.217.020
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