CN-122017697-A - Detection device and method for original extremely weak magnetic field of extra-ground sample

CN122017697ACN 122017697 ACN122017697 ACN 122017697ACN-122017697-A

Abstract

The disclosure provides a detection device and method for an original extremely weak magnetic field of an underground sample. The detection device comprises a magnetic shielding cylinder, an atomic magnetometer, a linear displacement platform, a driving motor, a glass rod and an external sample, wherein a shielding cavity for magnetic field measurement is formed in the magnetic shielding cylinder, the atomic magnetometer is arranged in the shielding cavity, the linear displacement platform is arranged above the magnetic shielding cylinder and used for providing displacement adjustment along a preset direction, the driving motor is fixedly arranged on the linear displacement platform, one end of the glass rod is fixed on an output shaft of the driving motor, the other end of the glass rod is used for bearing the external sample, and the glass rod is driven to move under the synergistic effect of the linear displacement platform and the driving motor so as to move the external sample to a measurement area of the atomic magnetometer in the shielding cavity, so that the atomic magnetometer can detect the original extremely weak magnetic field of the external sample.

Inventors

GUO QINGQIAN
SHI GUOHUA
XU XIN
WANG JIXIANG
LU JING
SHEN BING
LIU YULAN

Assignees

中国科学院杭州医学研究所

Dates

Publication Date: 20260512
Application Date: 20260324

Claims (10)

1. A detection device for an original extremely weak magnetic field of an extraterrestrial sample, comprising: A magnetic shielding cylinder, in which a shielding cavity for magnetic field measurement is formed; an atomic magnetometer disposed inside the shielded cavity; the linear displacement platform is arranged above the magnetic shielding cylinder and is used for providing displacement adjustment along a preset direction; The driving motor is fixedly arranged on the linear displacement platform; one end of the glass rod is fixed on the output shaft of the driving motor, and the other end of the glass rod is used for bearing an underground sample; Under the synergistic effect of the linear displacement platform and the driving motor, the glass rod is driven to move, and the extra-ground sample is moved to a measuring area of the atomic magnetometer in the shielding cavity, so that the atomic magnetometer detects an original extremely weak magnetic field of the extra-ground sample.
2. The detection apparatus according to claim 1, wherein the drive motor includes a servo motor; The linear displacement platform and the servo motor are used for driving the glass rod to linearly move along the radial direction of the magnetic shielding cylinder, driving the glass rod to rotate after the extra-ground sample moves to the measuring area of the atomic magnetometer, and converting the static magnetic field of the extra-ground sample into an alternating magnetic field so that the atomic magnetometer can acquire a magnetic field intensity change signal.
3. The detection apparatus according to claim 1 or 2, characterized in that the detection apparatus further comprises: A bread board, the surface of which is provided with a mounting hole array formed by a plurality of mounting holes; the right-angle bracket is arranged in the mounting hole, and the linear displacement platform is arranged on the right-angle bracket; and a bread board bracket for mounting the bread board above the magnetic shielding barrel so as to keep the bread board and the magnetic shielding barrel mechanically isolated.
4. A test device according to claim 3, wherein the test device further comprises: The driving motor bracket is used for installing the driving motor on the linear displacement platform; the coupler is used for connecting the glass rod with the output shaft of the driving motor; The atomic magnetometer mounting bracket is used for mounting and fixing the atomic magnetometer; the magnetic shielding cylinder inner mounting plate is used for mounting the atomic magnetometer mounting bracket, so that the atomic magnetometer is positioned in an inner magnetic field uniform area; The support platform is used for installing and fixing the magnetic shielding cylinder and the bread board bracket.
5. The detection apparatus according to claim 1 or 2, wherein the extraterrestrial sample is moved to a geometric center position of the magnetic shield cylinder axis by a linear displacement stage.
6. The detection apparatus according to claim 1 or 2, wherein the atomic magnetometer is configured to detect the original extremely weak magnetic field of the extra-ground sample by a non-contact detection method.
7. The detection device according to claim 1 or 2, characterized in that the material of the magnetic shielding cylinder comprises a high magnetic permeability material, and the magnetic shielding cylinder is made of a plurality of layers of high magnetic permeability material.
8. The apparatus according to claim 1 or 2, wherein the glass rod material comprises a high purity, low magnetic, low hysteresis material.
9. The detection device according to claim 1 or 2, characterized in that the sensitivity of the atomic magnetometer is of the order of femtosla.
10. The detection method for the original extremely weak magnetic field of the underground sample is characterized by being realized based on the detection device of any one of claims 1-9, and comprises the following steps: after the extra-ground sample is fixed or attached to the free end of the glass rod, the glass rod is adjusted to an initial position, so that the extra-ground sample is positioned outside the magnetic shielding cylinder; The linear displacement platform is controlled to displace along a preset direction, the glass rod is driven to move by a driving motor, and the extraterrestrial sample is moved to a measuring area of an atomic magnetometer in the shielding cavity; The glass rod is driven to rotate by the driving motor, and the static magnetic field of the underground sample is converted into an alternating-current magnetic field; The magnetic field intensity change signal is acquired by an atomic magnetometer.

Description

Detection device and method for original extremely weak magnetic field of extra-ground sample Technical Field The disclosure relates to the technical field of extremely weak magnetic field detection, in particular to a detection device and method for an original extremely weak magnetic field of an underground sample. Background The precise measurement of the magnetic characteristics of the extra-ground sample is an important method for analyzing the early magnetic field evolution, merle impact and solar wind action mechanism of the celestial body, and the method relies on a high-sensitivity magnetic field measurement technology to measure the magnetic field signals of the extra-ground sample. The core equipment for measuring the magnetic field of the sample outside the ground is a superconducting rock magnetometer, and the core structure of the core equipment comprises a detection coil, a cryogenic refrigeration system and a signal amplification module, wherein the sensitivity is usually of the order of pT (10 -12 T). The device has strong measurement stability and anti-interference capability, and is widely applied to measurement and analysis of magnetic characteristics of an underground sample and various rocks. However, since the particle size of the sample particles outside the earth is small (in the order of μm) and the signal intensity of the original magnetic field is extremely weak and far lower than the detection limit of the conventional superconducting rock magnetometer, effective detection cannot be achieved. Disclosure of Invention In view of the above, embodiments of the present disclosure provide a device and a method for detecting an original weak magnetic field of an extra-ground sample, which can at least partially solve the above technical problems. The embodiment of the disclosure provides a detection device for an original extremely weak magnetic field of an underground sample, which comprises a magnetic shielding cylinder, an atomic magnetometer, a linear displacement platform, a driving motor, a glass rod and a glass rod, wherein a shielding cavity for magnetic field measurement is formed inside the magnetic shielding cylinder, the atomic magnetometer is arranged inside the shielding cavity, the linear displacement platform is arranged above the magnetic shielding cylinder and is used for providing displacement adjustment along a preset direction, the driving motor is fixedly arranged on the linear displacement platform, one end of the glass rod is fixedly arranged on an output shaft of the driving motor, and the other end of the glass rod is used for bearing the underground sample, and the glass rod is driven to move under the synergistic effect of the linear displacement platform and the driving motor, so that the underground sample is moved to a measurement area of the atomic magnetometer inside the shielding cavity, and the atomic magnetometer is used for detecting the original extremely weak magnetic field of the underground sample. According to the embodiment of the disclosure, the driving motor comprises a servo motor, the linear displacement platform and the servo motor are used for driving the glass rod to linearly move along the radial direction of the magnetic shielding cylinder, the glass rod is driven to rotate after the underground sample is moved to the measuring area of the atomic magnetometer, and the static magnetic field of the underground sample is converted into an alternating magnetic field so that the atomic magnetometer can acquire a magnetic field strength change signal. According to the embodiment of the disclosure, the detection device further comprises a bread board, a right-angle bracket, a linear displacement platform and a bread board bracket, wherein the surface of the bread board is provided with a mounting hole array formed by a plurality of mounting holes, the right-angle bracket is arranged in the mounting holes, the linear displacement platform is arranged on the right-angle bracket, and the bread board bracket is used for mounting the bread board above the magnetic shielding barrel so as to keep the bread board and the magnetic shielding barrel mechanically isolated. According to the embodiment of the disclosure, the detection device further comprises a driving motor support, a coupler, an atomic magnetometer mounting support, a shielding cylinder inner mounting plate and a supporting platform, wherein the driving motor support is used for fixing a driving motor on a linear displacement platform, the coupler is used for connecting a glass rod with an output shaft of the driving motor, the atomic magnetometer mounting support is used for mounting and fixing an atomic magnetometer, the shielding cylinder inner mounting plate is used for mounting the atomic magnetometer mounting support, the atomic magnetometer is located in an inner magnetic field uniform area, and the supporting platform is used for mounting and fixing a magnetic shielding cylinder