Magnetic resonance signal phase closed-loop control method and system based on variable parameter control
A magnetic resonance signal and closed-loop control technology, which is applied in the direction of the magnitude/direction of the magnetic field, and the use of magneto-optical equipment for magnetic field measurement, etc., can solve the problems of calculation results drifting with ambient temperature changes, large noise interference, etc., and improve the magnetic field measurement. Effects of stability, noise reduction, and phase lag reduction
Active Publication Date: 2022-05-10
BEIJING AUTOMATION CONTROL EQUIP INST
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[0004] The invention provides a magnetic resonance signal phase closed-loop control method and system based on variable parameter control, which can solve the technical problems that the phase demodulation method in the prior art has large noise interference and the calculation result has a large drift with the change of the ambient temperature
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[0020] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. The following description of at least one exemplary embodiment is merely illustrative in nature and in no way taken as limiting the invention, its application or uses. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0021] It should be noted that the terminology used here is only used to describe specific implementations, and is not intended to limit...
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The invention provides a magnetic resonance signal phase closed-loop control method and system based on variable parameter control. The method comprises the following steps: generating a digital reference signal and a magnetic field excitation signal based on a DDS technology; acquiring a magnetic resonance signal of the atomic air chamber; respectively filtering the digital reference signal and the magnetic resonance signal, and adjusting the filtering parameters of the digital reference signal and the magnetic resonance signal in each operation period; calculating to obtain a phase difference between the magnetic resonance signal and the digital reference signal; performing phase compensation on the phase difference between the magnetic resonance signal and the digital reference signal; and adjusting frequencies of the digital reference signal and the magnetic field excitation signal according to a difference value between a phase difference between the magnetic resonance signal and the magnetic field excitation signal and an expected phase difference to complete phase closed-loop control of the magnetic resonance signal. According to the technical scheme, the technical problems that in the prior art, noise interference of a phase demodulation method is large, and a calculation result drifts greatly along with the change of the environment temperature are solved.
Description
technical field [0001] The invention relates to the technical field of atomic magnetometer phase control, in particular to a magnetic resonance signal phase closed-loop control method and system based on variable parameter control. Background technique [0002] The alkali metal atomic magnetometer uses the precession of electron spin or nuclear spin in the magnetic field to measure the magnetic field. It has the advantages of high precision and small size. , Surface and aviation target detection, etc., are of great significance in the fields of national economic construction and national defense. When the alkali metal atomic magnetometer measures the earth's magnetic field, the atoms in the atomic gas chamber are required to work in a resonance state. At this time, the frequency of the excitation signal and the magnetic resonance signal are the same, and the phase difference is constant. The atomic magnetometer has the highest sensitivity and stability. . Therefore, in ord...
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IPC IPC(8): G01R33/032
CPCG01R33/032Y02A90/30
Inventor 万双爱薛帅秦杰郭宇豪魏克全
Owner BEIJING AUTOMATION CONTROL EQUIP INST
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