High-sensitivity low-noise magnetic sensor for remote detection in well

By designing stacked hollow magnetic cores, differential amplifier circuits, and magnetic flux negative feedback modules, the sensitivity and bandwidth issues of the magnetic sensor in the well under harsh environments were solved, achieving high sensitivity and wide bandwidth for long-range detection in the well.

CN122151230APending Publication Date: 2026-06-05JILIN UNIVERSITY
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Patent Information

Application Number
CN202610640054.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-11
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Existing well magnetic sensors are insufficient in sensitivity and have limited operating bandwidth under conditions of high temperature, high pressure, strong vibration and strong environmental interference, making it difficult to effectively capture weak magnetic signals in the far field.

Method used

By employing a stacked hollow magnetic core, a differential amplifier circuit based on junction field-effect transistors and operational amplifiers, a magnetic flux negative feedback module, a temperature compensation module, and a low-noise power supply and filtering module, combined with high-temperature resistant materials and packaging design, a high-sensitivity, wide-bandwidth magnetic sensor is formed.

Benefits of technology

It achieves high-sensitivity and wide-bandwidth magnetic signal detection in harsh downhole environments, improves the signal-to-noise ratio and anti-interference capability, and meets the needs of long-distance detection in wells.

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Abstract

The invention discloses a high-sensitivity low-noise magnetic sensor for remote detection in a well, and belongs to the technical field of geophysical exploration. The sensor comprises a magnetic core and coil assembly, a front differential amplification module, a magnetic flux negative feedback module, a temperature compensation module, a power supply and filtering module and a titanium alloy packaging shell. The magnetic core is of a permalloy laminated hollow structure. The coil assembly comprises an induction coil and a feedback coil which are tightly coupled. The pre-amplification module adopts a fully differential structure formed by connecting JFETs in parallel, so that low-noise amplification is realized; the magnetic flux negative feedback module expands a working frequency band; the temperature compensation module stabilizes sensitivity and a working point; the power supply and filtering module reduces noise interference; the packaging shell achieves electromagnetic shielding, anti-corrosion and anti-seismic protection. The problems that an existing sensor is insufficient in sensitivity, poor in interference resistance and weak in adaptability are solved, far-field weak magnetic signals can be effectively captured, and the sensor is suitable for resource exploration in an underground complex environment.
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