Publication: Magnetic sensor design for femtotesla low-frequency signals
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Harriman, Sarah K.
Paschal, Evans W.
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Abstract
A system for detecting magnetic fields in the femtotesla range at low frequencies is developed, including the antenna, transformer, and amplifier. Each component is described with relevant tradeoffs which allow a large variety of receivers to be easily designed for any magnetic field sensing in the very low frequency range. A system using a 1-Ω–1-mH impedance antenna is developed further as an example that has been used extensively in measurements all over the world in the frequency range of 50 Hz–30 kHz. It has a gain of 0.58 V/nT and a sensitivity of below 1 fT/Hz1/2 above 250 H
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IEEE-Inst Electrical Electronics Engineers Inc
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Source
IEEE Transactions on Geoscience and Remote Sensing
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DOI
10.1109/TGRS.2009.2027694
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