Wideband precision phase detection for magnetic induction spectroscopy

Abstract

Magnetic induction spectroscopy (MIS) has many applications providing a contactless impedance meausrement. However, MIS applications is currently limited due to the high precision of phase detection required over a wide band of frequencies. This paper focuses on phase detection aspect of the MIS and the advantages and disadvantages of various phase detection methods and phase detection subsystem architectures are discussed. The chosen phase detection method is investigated further and prototype hardware and software is developed. The developed prototype is tested and compared to other recent MIS sysetm design. The prototype hardware is able to measure the phase difference of signals from below 200kHz to over 20MHz with milli-radian precision which will significantly enhance the MIS systems.

A Review on Magnetic Induction Spectroscopy Potential for Fetal Acidosis Examination

“…Magnetic Induction Spectroscopy (MIS) is one of the BIS techniques that uses electrical conductivity of materials as a function of frequency [ 34 ]. This technique is concerned with the investigation and measurement of spectra produced when magnetic fields interact with matter or emit electromagnetic radiation.…”

“…MIS also has great potential in biomedical engineering applications, especially due to its non-contact measurement capability [ 34 ]. MIS has been used on rabbits as a brain diagnostic device to differentiate between two types of strokes which are hemorrhagic and ischemic [ 51 ].…”

Magnetic Induction Tomography Spectroscopy for Structural and Functional Characterization in Metallic Materials

“…Our previous studies on MIS deal with hardware development [33], as well as characterizing ferromagnetic materials [34]. Various image reconstruction methods for soft field tomography techniques have been reviewed in [35].…”

Multiple regression-based prediction correlations for enhanced sensor design of magnetic induction tomography systems

“…Several MIT systems have been designed over the past three decades, most of which rely on circular helix coils sensors [2], [8], [9], [10], [11], [12], [13], [14]. The reason for this selection is, however, not well elaborated in the literature.…”