Active graded magnetic compensation system and method for unshielded serf atomic magnetometer

By using an active hierarchical magnetic compensation system and method, the problem of high-precision magnetic field compensation for unshielded SERF magnetometers in complex geomagnetic environments has been solved, achieving rapid approach to zero magnetic field state and high-sensitivity magnetic field measurement, which is applicable to fields such as resource exploration, earthquake monitoring and geology.

WO2025228306A1 Publication Date: 2025-11-06CHINA STATE SHIPBUILDING CORP NO 707 RES INST
8 Cites 4 Cited by

Patent Information

Application Number
PCT/CN2025/091561
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-04-30
Filing Date
2025-04-27
Publication Date
2025-11-06

AI Technical Summary

Technical Problem

Existing unshielded SERF magnetometers struggle to achieve high-precision magnetic field compensation in complex geomagnetic environments, limiting their application in fields such as resource exploration, earthquake monitoring, and geology.

Method used

An active hierarchical magnetic compensation system is adopted, including a magnetic field compensation coil, a magnetic field modulation coil, and a hierarchical feedback control module. Through hierarchical compensation and closed-loop control, high-precision magnetic field compensation in geomagnetic environments is achieved.

Benefits of technology

The magnetic compensation feedback speed and accuracy of the unshielded SERF magnetometer have been improved, the startup time has been reduced, and the sensitivity and stability of the instrument in complex geomagnetic environments have been enhanced.

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

Abstract

The present disclosure relates to an active graded magnetic compensation system and method for an unshielded SERF magnetometer. The system comprises: a detection laser, a half-wave plate, a magnetic field compensation coil, a magnetic field modulation coil, a non-magnetic heating assembly, an alkali-metal atomic vapor cell, a polarizing beam splitter prism, a balanced photodetector, a graded feedback control module, a pump laser, a quarter-wave plate, a focusing lens and a photodetector. By means of the present disclosure, a graded compensation system is used to realize high-precision compensation for a magnetic field within a large dynamic range in a geomagnetic environment, thereby ensuring that an instrument carries out high-sensitivity magnetic field measurement under geomagnetic conditions.
Need to check novelty before this filing date? Find Prior Art