Weak magnetic field synchronous measurement device and weak magnetic field synchronous measurement system

By combining a signal generator, a reference magnetic field generating device, and a signal demodulation device, the problem of simultaneously measuring steady magnetic fields and alternating magnetic fields in existing technologies has been solved, and accurate measurement of complex magnetic fields has been achieved.

CN121522544APending Publication Date: 2026-02-13THE CHINESE UNIV OF HONG KONG (SHENZHEN)
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Patent Information

Application Number
CN202511764811.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-11-27
Publication Date
2026-02-13

AI Technical Summary

Technical Problem

Existing technologies struggle to achieve synchronous, real-time, and accurate differentiation and measurement of two magnetic field components in complex magnetic field environments composed of superimposed steady and alternating magnetic fields.

Method used

A signal generator outputs an AC constant current power supply, a reference magnetic field generating device generates a reference magnetic field, a magnetic field detection device detects and outputs a signal, a signal demodulation device demodulates the amplitude and phase, and a lock-in amplifier is used to achieve synchronous measurement of complex magnetic fields.

Benefits of technology

It enables synchronous, real-time, and accurate differentiation and measurement of steady magnetic fields and alternating magnetic fields, improving the accuracy of measurement and the signal-to-noise ratio.

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Abstract

The invention discloses a weak magnetic field synchronous measurement device and a weak magnetic field synchronous measurement system, and the device comprises a signal generator which is used for outputting a first AC constant current power supply and a second AC constant current power supply; the reference magnetic field generation device is electrically connected with the signal generator, and the reference magnetic field generation device is used for being connected with a direct-current constant-current power supply and a first alternating-current constant-current power supply to generate a reference magnetic field; the magnetic field detection device is electrically connected with the signal generator, and the magnetic field detection device is used for being driven by a second alternating-current constant-current power supply, detecting a reference magnetic field and outputting a reference magnetic field detection signal; and the signal demodulating device is electrically connected with the magnetic field detection device, the signal demodulating device is used for demodulating the reference magnetic field detection signal to obtain a reference signal and outputting the amplitude and phase of the reference signal on a first reference frequency and a second reference frequency, and the second reference frequency is twice of the first reference frequency. According to the invention, a complex magnetic field formed by superposing a steady magnetic field and an alternating magnetic field can be measured.
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