A method for magnetic field measurement without measurement dead zone

By combining three measurement optical paths and a three-axis coil, the measurement dead zone problem of the full-field atomic magnetometer was solved, realizing dead-zone-free magnetic field measurement, improving the measurement accuracy and sensitivity of the magnetometer, and simplifying the control logic.

CN122362228APending Publication Date: 2026-07-10HANGZHOU MAGNETIC TESTING TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HANGZHOU MAGNETIC TESTING TECHNOLOGY CO LTD
Filing Date
2026-04-22
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing full-field atomic magnetometers cannot effectively respond to changes in the external magnetic field when there is an angle between the magnetic field and the measuring optical axis, resulting in a measurement dead zone and affecting measurement accuracy and reliability.

Method used

A three-path measurement optical system is employed, with each path passing through an independent atomic gas chamber at a certain angle. Combined with a triaxial coil and signal fusion technology, signal processing is performed through an adder circuit and a lock-in amplifier to achieve dead-zone-free magnetic field measurement.

Benefits of technology

It enables dead-zone-free measurement in any magnetic field direction, simplifies the control circuit, improves measurement accuracy and sensitivity, and enhances anti-interference capability.

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Abstract

This invention discloses a magnetic field measurement method without measurement dead zone, comprising: a signal generator sending a swept-frequency AC signal to a radio frequency coil and a lock-in amplifier; the radio frequency coil receiving the signal generating a swept-frequency radio frequency magnetic field of the same frequency to an alkali metal atom gas cell; the atoms receiving the signal generating a magnetic resonance phenomenon, causing a change in the absorption of laser light generated by a laser diode; a photodetector detecting an electrical signal; three measurement units generating three changing electrical signals; these three changing electrical signals being superimposed in an adder circuit and then sent to the lock-in amplifier; the lock-in amplifier demodulating the swept-frequency AC signal as a reference signal and outputting a magnetic resonance signal; a host computer establishing a magnetic resonance curve using the intensity of the magnetic resonance signal as the ordinate and the swept-frequency frequency as the abscissa; and determining the final frequency and calculating the magnetic field magnitude based on the magnetic resonance curve through multiple steps. This invention enables an atomic magnetometer that can operate in any magnetic field direction.
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