Miniaturized broadband induction type magnetic field sensor

By integrating a specially designed magnetic core and feedback coil, combined with optimized coil winding and circuit processing, the size and weight issues of inductive magnetic field sensors have been solved, realizing a miniaturized and high-performance inductive magnetic field sensor suitable for geophysical exploration.

CN121634288AActive Publication Date: 2026-03-10INSTITUTE OF GEOLOGY AND GEOPHYSICS CHINESE ACADEMY OF SCIENCES
5 Cites 1 Cited by

Patent Information

Application Number
CN202610155027.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-02-04
Publication Date
2026-03-10
Estimated Expiration
2046-02-04

AI Technical Summary

Technical Problem

Existing inductive magnetic field sensors are bulky and heavy, making it difficult to miniaturize and lighten them. They are also inefficient for field exploration and deployment in complex terrain areas, and their circuit design is complex.

Method used

It employs a high-performance magnetic core with specific dimensions and aspect ratio, combined with an integrated design of feedback coil and electromagnetic shielding layer, using high permeability soft magnetic tape and longitudinal magnetic field annealing treatment, combined with optimized coil winding method and low noise signal processing circuit, to achieve integrated optimization of magnetic core and circuit.

Benefits of technology

The sensor has been miniaturized (outer diameter less than 65mm, weight less than 4kg), and has high sensitivity and extremely low noise in the 0.1Hz to 10kHz frequency band, which improves the portability and operational flexibility of field exploration, and enhances the ability to resist external interference and the reliability of the system.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention relates to the related technical field of geophysical exploration instruments, in particular to a miniaturized broadband induction type magnetic field sensor. The sensor comprises a magnetic core, an induction coil, a feedback coil and a signal processing circuit. The invention is characterized in that the magnetic core is of a long rod-shaped structure formed by laminating and curing high-permeability soft magnetic strip materials, the length of the magnetic core is 580mm-640mm, the cross section of the magnetic core is a square or an equivalent circle with the side length of 11mm-15mm, and the length-diameter ratio of the magnetic core is greater than 40; the feedback coil is formed by spirally winding a metal foil belt along the magnetic core, and the metal foil belt forms a main shielding layer for restraining interference of an external electric field at the same time. By optimizing the size and the length-diameter ratio of the magnetic core and combining the integrated design of feedback and shielding functions, while the working frequency band and the low-noise performance are ensured, remarkable miniaturization and light weight of the sensor are realized, and the portability and the layout efficiency of field exploration are greatly improved.
Need to check novelty before this filing date? Find Prior Art