CN-122017691-A - Quantum very weak magnetic field detection system

CN122017691ACN 122017691 ACN122017691 ACN 122017691ACN-122017691-A

Abstract

The invention discloses a quantum extremely weak magnetic field detection system which comprises a quantum sensing module, an optical excitation acquisition module, a signal processing module, a microwave control module and an environment control module, wherein the microwave control module generates a microwave field with tunable frequency and applies the microwave field to the quantum sensing module, the environment control module inhibits disturbance of external magnetic field disturbance, temperature fluctuation and mechanical vibration on a detection process, the quantum sensing module outputs an optical response signal associated with a magnetic field state, the optical excitation acquisition module provides excitation light for the quantum sensing module to initialize the quantum state and acquire fluorescent signals generated by the quantum state, and the signal processing module receives the fluorescent signals, performs data preprocessing based on an optical detection magnetic resonance principle and outputs magnetic field strength and vector direction information. Compared with the prior art, the invention has the advantages of realizing extremely weak magnetic field detection, and simultaneously considering system stability and scene adaptability.

Inventors

CUI XIANGHU
XU YUEFEI
WU XIAOHUAN
Zhong Hengqiang
CHEN SHIZHE
CHEN YUNLONG
XU YINFEI

Assignees

杭州电力设备制造有限公司

Dates

Publication Date: 20260512
Application Date: 20260210

Claims (9)

1. The quantum extremely weak magnetic field detection system is characterized by comprising a quantum sensing module, an optical excitation acquisition module, a signal processing module, a microwave control module and an environment control module; The microwave control module generates a microwave field with tunable frequency and applies the microwave field to the quantum sensing module, and the environment control module suppresses disturbance of external magnetic field disturbance, temperature fluctuation and mechanical vibration on a detection process; The quantum sensing module outputs an optical response signal associated with the magnetic field state, and the optical excitation acquisition module provides excitation light for the quantum sensing module to initialize the quantum state and acquire a fluorescent signal generated by the quantum state; the signal processing module receives fluorescent signals, performs data preprocessing based on an optical detection magnetic resonance principle, and outputs magnetic field intensity and vector direction information.
2. The quantum extremely weak magnetic field detection system according to claim 1, wherein the quantum sensing module comprises a sensitive medium unit and a supporting protection unit; The sensitive medium unit adopts a solid color center structure with optically readable spin characteristic; the support protection unit secures the sensitive media unit and provides thermal management and interface noise suppression.
3. The quantum extremely-weak magnetic field detection system according to claim 1, wherein the optical excitation acquisition module comprises a light source unit, an optical path guiding unit and a fluorescence detection unit; The light source unit outputs excitation light, and the light path guiding unit guides the excitation light to the quantum sensing module and efficiently collects fluorescence; The fluorescence detection unit converts a fluorescence signal into an electric signal and outputs the electric signal to the signal processing module.
4. The quantum extremely-weak magnetic field detection system according to claim 1, wherein the microwave control module comprises a microwave generation unit and a microwave radiation unit; The microwave generating unit outputs a microwave signal with controllable frequency and power; the microwave radiation unit forms a microwave field with uniform spatial distribution in a sensitive area of the quantum sensing module.
5. The quantum extremely-weak magnetic field detection system of claim 1, wherein the signal processing module comprises a signal conversion unit and an intelligent processing unit; The signal conversion unit completes analog-to-digital conversion and pretreatment of the fluorescent signal; The intelligent processing unit executes self-adaptive noise suppression and resonance frequency dynamic tracking, and solves magnetic field parameters.
6. The quantum extremely-weak magnetic field detection system according to claim 1, wherein the environment control module comprises a magnetic shielding unit, a temperature control unit and a vibration isolation unit; The magnetic shielding unit attenuates external static magnetic field and low-frequency alternating magnetic field, the temperature control unit maintains the temperature stability of the detection area, and the vibration isolation unit blocks an external vibration transmission path.
7. The quantum extremely-weak magnetic field detection system according to claim 2, wherein the quantum sensing module further comprises a plurality of independent sensing areas which are distributed in space, and the system synchronously acquires output signals of all the areas and performs differential operation to inhibit common mode environmental noise; The sensing areas are arranged in a gradiometer configuration.
8. The quantum extremely-weak magnetic field detection system according to claim 1, further comprising an automatic calibration module, wherein the automatic calibration module generates a controllable standard reference magnetic field, and the driving system completes sensitivity calibration and zero drift correction.
9. The quantum extremely-low-intensity magnetic field detection system according to claim 2, wherein the quantum sensing module is packaged as an optical fiber coupled micro probe, the probe transmits excitation light and fluorescent signals through an optical fiber, and is connected with an external microwave source through a flexible microwave transmission structure, so that the system is suitable for in-situ magnetic field detection in a narrow space or in-body surface/in-vivo scene of a living body.

Description

Quantum very weak magnetic field detection system Technical Field The invention relates to the technical field of precise magnetic field measurement, in particular to a quantum extremely weak magnetic field detection system. Background Quantum extremely weak magnetic field detection is urgently required in the fields of biomedical imaging (such as brain magnetic diagram), geological exploration and material characterization. The current ultra-weak magnetic field detection mainly depends on a superconducting quantum interference device or an atomic magnetometer, wherein the SQUID needs liquid helium cooling, and the system is complex and high in cost; While the quantum magnetic sensing technology based on the diamond nitrogen vacancy color center has the potential of room temperature working, nano-scale resolution and the like, the conventional system has obvious defects that the spin coherence time is short due to insufficient surface charge noise suppression, the fluctuation of an environment magnetic field, the temperature drift and the vibration interference are difficult to completely eliminate, the probe is large in volume, the probe is difficult to adapt to a narrow space or an in-situ detection scene in a living body, and the practical application of an extremely weak magnetic field is limited. Disclosure of Invention The invention aims to solve the technical problems, overcome the technical defects, and provide the system which realizes extremely weak magnetic field detection and simultaneously combines system stability and scene adaptability. In order to solve the technical problems, the technical scheme provided by the invention is that the quantum extremely weak magnetic field detection system comprises a quantum sensing module, an optical excitation acquisition module, a signal processing module, a microwave control module and an environment control module; The microwave control module generates a microwave field with tunable frequency and applies the microwave field to the quantum sensing module, and the environment control module suppresses disturbance of external magnetic field disturbance, temperature fluctuation and mechanical vibration on a detection process; The quantum sensing module outputs an optical response signal associated with the magnetic field state, and the optical excitation acquisition module provides excitation light for the quantum sensing module to initialize the quantum state and acquire a fluorescent signal generated by the quantum state; the signal processing module receives fluorescent signals, performs data preprocessing based on an optical detection magnetic resonance principle, and outputs magnetic field intensity and vector direction information. Preferably, the quantum sensing module comprises a sensitive medium unit and a supporting protection unit; The sensitive medium unit adopts a solid color center structure with optically readable spin characteristic; the support protection unit secures the sensitive media unit and provides thermal management and interface noise suppression. Preferably, the optical excitation acquisition module comprises a light source unit, a light path guiding unit and a fluorescence detection unit; The light source unit outputs excitation light, and the light path guiding unit guides the excitation light to the quantum sensing module and efficiently collects fluorescence; The fluorescence detection unit converts a fluorescence signal into an electric signal and outputs the electric signal to the signal processing module. Preferably, the microwave control module comprises a microwave generating unit and a microwave radiating unit; The microwave generating unit outputs a microwave signal with controllable frequency and power; the microwave radiation unit forms a microwave field with uniform spatial distribution in a sensitive area of the quantum sensing module. Preferably, the microwave control module comprises a microwave generating unit and a microwave radiating unit; The microwave generating unit outputs a microwave signal with controllable frequency and power; the microwave radiation unit forms a microwave field with uniform spatial distribution in a sensitive area of the quantum sensing module. Preferably, the microwave control module comprises a microwave generating unit and a microwave radiating unit; The microwave generating unit outputs a microwave signal with controllable frequency and power; the microwave radiation unit forms a microwave field with uniform spatial distribution in a sensitive area of the quantum sensing module. Preferably, the environment control module comprises a magnetic shielding unit, a temperature control unit and a vibration isolation unit; The magnetic shielding unit attenuates external static magnetic field and low-frequency alternating magnetic field, the temperature control unit maintains the temperature stability of the detection area, and the vibration isolation unit blocks an external vibration trans