Integrated shielded coil sensor for magnetic induction imaging system

Abstract

The invention discloses an integrated shielded coil sensor for a magnetic induction imaging system, comprising a shielded circuit board I, a shielded circuit board II and a detecting coil circuit board, wherein the detecting coil circuit board is arranged between the shielded circuit board I and the shielded circuit board II, and the detecting coil circuit board, the shielded circuit board I and the shielded circuit board II are tightly jointed into a whole; the obverse surface and the reverse surface of the shielded circuit board I are respectively provided with a comb-like shielded wire, the comb-like shielded wires are connected together through a public connecting line, but not formed into a loop and are grounded through one point; and detecting coils are covered on the obverse surface and the reverse surface of a detecting board body of the detecting coil circuit board along an open pore. A three-layer pressed arrangement structure including a shielded board, the detecting board and the other shielded board is adopted in the integrated shielded coil sensor, all the shielded wires are grounded through a single point, and no loops are formed on the shielded boards, so that all wires on the shielded boards form a zero-level and equal-potential closed structure, and interference from an electric field capacity coupling signal in a magnetic induction imaging technology can be effectively shielded.

Description

technical field [0001] The invention relates to magnetic induction signal measurement, in particular to the design of a coil sensor for shielding capacitively coupled interference signals in magnetic induction medical imaging technology, and more specifically to an integrated shielded coil sensor for a magnetic induction imaging system. Background technique [0002] Magnetic induction medical imaging technology is a new type of non-contact imaging technology. In this technology, the excitation coil with a sinusoidal current will generate a time-varying main magnetic field in the surrounding space. When biological tissues are placed in the main magnetic field, eddy currents will be induced in the biological tissues, and the intensity of the eddy currents is proportional to the object's Conductivity, this eddy current also induces a secondary time-varying magnetic field in the surrounding space. [0003] The measurement of the time-varying magnetic field is realized by using...

AI Technical Summary

Problems solved by technology

However, the time-varying magnetic field will also generate a time-varying electric field in space, and the time-varying electric field will be directly coupled to the detection coil through capacitive coupling, thereby being superimposed on the induced electromotive force signal at the output end of the coil, forming Interference sources, which affect the accuracy of the measurement

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