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001     153151
005     20250129092447.0
024 7 _ |a 10.1088/0957-0233/25/5/055801
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024 7 _ |a 1361-6501
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024 7 _ |a 0957-0233
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037 _ _ |a FZJ-2014-02814
041 _ _ |a English
082 _ _ |a 600
100 1 _ |a Mester, A.
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245 _ _ |a Development and drift-analysis of a modular electromagnetic induction system for shallow ground conductivity measurements
260 _ _ |a Bristol
|c 2014
|b IOP Publ.
336 7 _ |a Journal Article
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520 _ _ |a Electromagnetic induction (EMI) is used for fast near surface mapping of the electrical conductivity (EC) for a wide range of geophysical applications. Recently, enhanced methods were developed to measure depth-dependent EC by inverting quantitative multi-configuration EMI data, which increases the demand for a suitable multi-channel EMI measurement system. We have designed a novel EMI system that enables the use of modular transmitter/receiver (TX/RX) units, which are connected to a central measurement system and are optimized for flexible setups with coil separations of up to 1.0 m. Each TX/RX-unit contains a coil, which is specifically adjusted for transmitting or receiving magnetic fields. All units enable impedance measurements at the coils, which are used to simulate its electrical circuit and analyze temperature-induced drift effects. A laboratory drift analysis at 8 kHz showed that 88% of the drift in the measured data is due to the change in the electrical transmitter coil resistance. The remaining 12% is due to changes in the transmitter coil inductance and capacitance, the receiver impedance and drifts in the amplification circuit. A measurement under field conditions proved that the new EMI system is able to detect a water-filled swimming pool with 50 mS m−1, using a coil separation of 0.3 m. In addition, the system allows in-field ambient noise spectra measurements in order to select optimal low-noise measurement frequencies
536 _ _ |a 246 - Modelling and Monitoring Terrestrial Systems: Methods and Technologies (POF2-246)
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700 1 _ |a Zimmermann, Egon
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700 1 _ |a Van der Kruk, J.
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700 1 _ |a Vereecken, H.
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700 1 _ |a Van Waasen, S.
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773 _ _ |a 10.1088/0957-0233/25/5/055801
|g Vol. 25, no. 5, p. 055801 -
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|t Measurement science and technology
|v 25
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856 4 _ |u https://juser.fz-juelich.de/record/153151/files/FZJ-2014-02814.pdf
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