Abstract
Magneto-inductive (MI) communication is a viable technology for wireless communications in underwater and underground environments. In this paper, a new design for an MI transmitter is presented. Unlike conventional MI transmitters that utilize coiled loops or solenoids to generate magnetic fields, we demonstrate the feasibility and advantages of using a rotating permanent magnet. We also present and experimentally verify a modulation technique that does not involve changing the rotational speed of the magnet. By electrically changing the permeability of a surrounding shield, the fields from the rotating magnet are amplitude modulated. Our findings suggest that increased efficiency and bandwidth can be realized compared to conventional MI transmitters.
Highlights
In the last couple of decades, magneto-inductive (MI) communication systems have received much interest for applications involving underground and underwater communications
Modulated Reluctance (EMR): We propose that a current carrying coil can be used to modulate the permeability of a shielding material and the fields from the rotating magnet
To demonstrate Electrically Modulated Reluctance (EMR) ASK modulation, an 8 × 7.5 cm [L × D] cylinder was constructed with 0.254 mm thick MuMETAL1 (LK-110, Fully Annealed), which is a high permeability material used for shielding low frequency fields
Summary
A mechanically based magneto-inductive transmitter with electrically modulated reluctance.
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