High-bandwidth high-sensitivity closed-loop SERF atom magnetometer device

An atomic magnetic, high-bandwidth technology, applied in the field of extremely weak magnetic detection, can solve problems such as inability to measure bandwidth, and achieve the effect of improving the linear range of device response and the dynamic range of magnetic field measurement, improving high-frequency detection sensitivity, and weakening shielding requirements.

Active Publication Date: 2021-03-16
JIHUA LAB
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the bandwidth can only be maintained at about 200Hz, and the measurement bandwidth above kHz cannot be truly realized.

Method used

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  • High-bandwidth high-sensitivity closed-loop SERF atom magnetometer device
  • High-bandwidth high-sensitivity closed-loop SERF atom magnetometer device
  • High-bandwidth high-sensitivity closed-loop SERF atom magnetometer device

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Embodiment

[0036] see figure 1, a structural schematic diagram of a high-bandwidth and high-sensitivity closed-loop SERF atomic magnetometer device provided in an embodiment of the present invention, including: a pump laser diode (1), a first plano-convex collimator lens (2), and a first 1 / 2 wave plate (3), the first laser isolator (4), beam expander lens (5), first mirror (6), first polarizer (7), 1 / 4 wave plate (8), detection laser diode (9 ), the second plano-convex collimating lens (10), the second 1 / 2 wave plate (11), the second laser isolator (12), the second mirror (13), the second polarizer (14), the second Three 1 / 2 wave plates (15), polarization beam splitter PBS and mirror combination (16), balance detector (17), alkali metal atom gas cell (18), heating box (19), three-axis Helmholtz Coil (20), magnetic shielding barrel (21), PID controller (22), adder (23), series resistance (24), data acquisition card (25), control computer (26), described alkali metal gas chamber (18) is ...

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Abstract

The invention provides a high-bandwidth high-sensitivity closed-loop SERF atom magnetometer device, which is characterized in that PID is introduced to form closed-loop control, so that the frequencyresponse -3dB bandwidth of a system is greatly improved, the kHz level can be reached, and the high-frequency detection sensitivity is improved. In addition, the bandwidth and the sensitivity curve ofthe SERF atom magnetometer can be freely and accurately controlled by adjusting three parameters of P, I and D, so that the sensitivity of the frequency range required by actual measurement reaches the highest. Besides, the measured magnetic field is compensated in real time through PID control, and the magnetic field in the direction of the detection axis is always locked at the zero point position, so that the response linear interval and the magnetic field measurement dynamic range of the device are greatly improved, and the shielding requirement on the external environment is weakened.

Description

technical field [0001] The invention relates to the field of extremely weak magnetic detection, in particular to a high-bandwidth and high-sensitivity closed-loop SERF atomic magnetometer device. Background technique [0002] The spin-exchange-relaxation-free (SERF) atomic magnetometer (AM) is a new type of extremely weak magnetic signal (~fT order) measurement sensor, which uses spin quantum manipulation and photoelectric detection to achieve high-sensitivity weak magnetic detection. Compared with the traditional extremely weak magnetic detection equipment - Superconducting Quantum Interferometer (SQUID), under the premise of ensuring equivalent sensitivity, the SERF atomic magnetometer can work at room temperature, and has the advantages of portability, miniaturization, and detection distance Close, low cost and other characteristics. [0003] At present, the atomic magnetometer has broad application prospects in the fields of biomagnetic detection such as heart magnetism...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/032
CPCG01R33/032Y02A90/30
Inventor 胡涛唐玉国郭清乾吴中毅常严杨晓冬
Owner JIHUA LAB
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