Spin ensemble magnetic resonance phase high-bandwidth high-precision detection method

A technology of spin ensemble and detection method, applied in magnetic resonance measurement, measurement using nuclear magnetic resonance image system, measurement of magnetic variables, etc., can solve the problems of reducing phase detection bandwidth and phase detection accuracy, and achieve detection accuracy high effect

Active Publication Date: 2020-04-24
BEIJING AUTOMATION CONTROL EQUIP INST
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Problems solved by technology

However, reducing the cutoff frequency of the low-pass filter will directly reduce the phase detection bandwidth, and increasing the cutoff frequency of the low-pass filter will reduce the accuracy of phase detection

Method used

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  • Spin ensemble magnetic resonance phase high-bandwidth high-precision detection method
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  • Spin ensemble magnetic resonance phase high-bandwidth high-precision detection method

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Embodiment Construction

[0034] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0035] Such as figure 2 As shown, a spin ensemble magnetic resonance phase high-bandwidth and high-precision detection method is specifically described as follows:

[0036] (1) Extract the phase difference information between the magnetic resonance signal and the excitation signal;

[0037] MRI signal V 0 The expression is

[0038] V 0 =A 0 sin(ω 0 t+θ 0 ) (1)

[0039] Among them, A 0 is the amplitude, ω 0 is the frequency, θ 0 is the initial phase.

[0040] Excitation signal V 1 The expression is

[0041] V 1 =A 1 cos(ω 1 t+θ 1 ) (2)

[0042] Among them, A 1 is the amplitude, ω 1 is the frequency, θ 1 is the initial phase.

[0043] Therefore, with figure 2 The signal V that contains the phase difference information between the magnetic resonance signal and the excitation signal 2 The expression is

[0044] ...

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Abstract

The invention discloses a spin ensemble magnetic resonance phase high-bandwidth high-precision detection method, thereby guaranteeing the detection precision of magnetic resonance signals and realizing the high detection bandwidth at the same time. The method comprises the following steps: (1), extracting phase difference information of a magnetic resonance signal and an excitation signal; (2), eliminating a frequency multiplication signal in the phase difference information of the magnetic resonance signal and the excitation signal; and (3), acquiring a phase difference between the magnetic resonance signal and the excitation signal. The detection method has the following beneficial effects: the phase detection method for the spin ensemble magnetic resonance signals of the quantum sensoris involved; to be specific, when the disclosed method is used to application of a quantum sensor based on the magnetic resonance effect, the magnetic resonance signal detection precision can be guaranteed and the detection bandwidth is high.

Description

technical field [0001] The invention belongs to a phase detection method of a spin ensemble magnetic resonance signal of a quantum sensor, in particular to a high-bandwidth and high-precision detection method of a spin ensemble magnetic resonance phase. Background technique [0002] The quantum sensor based on the spin ensemble magnetic resonance effect can achieve ultra-high precision by measuring the size-sensitive angular motion or magnetic field change of the spin ensemble magnetic resonance frequency. There are broad application prospects in fields such as anomaly detection. [0003] There is a correlation between the magnetic resonance frequency of the spin ensemble of quantum sensors and the strength of the surrounding magnetic field. The closer the precession frequency of the spin ensemble is to the resonance frequency, the higher the sensitivity of the sensor. Therefore, quantum sensors usually perform closed-loop control on the spin ensemble magnetic resonance sig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/54
CPCG01R33/54
Inventor 秦杰汤恩琼万双爱孙晓光刘建丰
Owner BEIJING AUTOMATION CONTROL EQUIP INST
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