Multifunction waveform generator for EM receiver testing
In many electromagnetic (EM) methods – such as magnetotelluric, spectral-induced polarization (SIP), time-domain-induced polarization (TDIP), and controlled-source audio magnetotelluric (CSAMT) methods – it is important to evaluate and test the EM receivers during their development stage. To asse...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2018-01-01
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| Series: | Geoscientific Instrumentation, Methods and Data Systems |
| Online Access: | https://www.geosci-instrum-method-data-syst.net/7/11/2018/gi-7-11-2018.pdf |
| Summary: | In many electromagnetic (EM) methods – such as magnetotelluric,
spectral-induced polarization (SIP), time-domain-induced polarization (TDIP), and
controlled-source audio magnetotelluric (CSAMT) methods – it is important to evaluate
and test the EM receivers during their development stage. To assess the
performance of the developed EM receivers, controlled synthetic data that
simulate the observed signals in different modes are required. In
CSAMT and SIP mode testing, the waveform generator should use the GPS time as the
reference for repeating schedule. Based on our testing, the frequency range,
frequency precision, and time synchronization of the currently available
function waveform generators on the market are deficient. This paper
presents a multifunction waveform generator with three waveforms: (1) a
wideband, low-noise electromagnetic field signal to be used for
magnetotelluric, audio-magnetotelluric, and long-period magnetotelluric
studies; (2) a repeating frequency sweep square waveform for CSAMT and SIP
studies; and (3) a <q>positive-zero–negative-zero</q> signal that contains
primary and secondary fields for TDIP studies.
In this paper, we provide the principles of the above three waveforms along
with a hardware design for the generator. Furthermore, testing of the EM
receiver was conducted with the waveform generator, and the results of the
experiment were compared with those calculated from the simulation and
theory in the frequency band of interest. |
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| ISSN: | 2193-0856 2193-0864 |