Power frequency noise-suppression device based on SQUID two-order gradient meters

A technology of power frequency noise and suppression device, applied in the field of superconducting electronics, can solve problems such as affecting nuclear magnetic resonance signals, affecting spectral lines or imaging quality, etc., to achieve the effect of improving the signal-to-noise ratio

Inactive Publication Date: 2017-05-24
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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Problems solved by technology

[0004] However, if figure 1 As shown, the power frequency and its harmonic interference in the ambient magnetic field will seriously affect the NMR signal of the measured sample in the extremely low field NMR system, and then affect the spectral line or imaging quality.

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  • Power frequency noise-suppression device based on SQUID two-order gradient meters
  • Power frequency noise-suppression device based on SQUID two-order gradient meters

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Embodiment Construction

[0028] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.

[0029] It should be noted that the diagrams provided in this embodiment are only schematically illustrating the basic idea of ​​the present invention, and only the components related to the present invention are shown in the diagrams rather than the number, shape and shape of the components in actual implementation. Dimensional drawing, the type, quantity and proportion of each component can be changed arbitrarily during actual impleme...

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Abstract

The invention provides a power frequency noise-suppression device based on SQUID two-order gradient meters. The power frequency noise-suppression device is applied to an ultra-low field nuclear magnetic resonance system. The power frequency noise-suppression device comprises a Dewar, a first SQUID two-order gradient meter, a second SQUID two-order gradient meter and a reading circuit, wherein the first SQUID two-order gradient meter and the second SQUID two-order gradient meter are both arranged in the Dewar; the diameter of the second SQUID two-order gradient meter is less than or equal to the diameter of the first SQUID two-order gradient meter; the first SQUID two-order gradient meter is used for detecting a nuclear magnetic resonance signal in the ultra-low field nuclear magnetic resonance system; the second SQUID two-order gradient meter is used for detecting a power frequency noise in an environmental magnetic field; and the reading circuit is used for reading out the output voltages of the first SQUID two-order gradient meter and the second SQUID two-order gradient meter, processing the output voltages and acquiring the nuclear magnetic resonance signal after the power frequency noise suppression. The power frequency noise-suppression device based on the SQUID two-order gradient meters, provided by the invention, can effectively suppress the power frequency noise interference and can increase the signal-to-noise ratio of the nuclear magnetic resonance signal.

Description

technical field [0001] The invention relates to the technical field of superconducting electronics, in particular to a power frequency noise suppression device based on a SQUID second-order gradiometer. Background technique [0002] Superconducting Quantum Interference Device (SQUID) is an extremely sensitive instrument that can measure weak magnetic signals. In terms of its function, it is a magnetic flux sensor. Measure other physical quantities that can be converted into magnetic flux, such as voltage, current, resistance, inductance, magnetic induction, magnetic field gradient, magnetic susceptibility, etc. The basic principle of SQUID is based on flux quantization and Josephson effect. According to the difference of bias current, it is divided into two types: DC and RF. SQUID as a detector can measure out 10 -11 The weak magnetic field of Gauss is only equivalent to one ten billionth of the earth's magnetic field, which is several orders of magnitude higher than the ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/00G01R33/035G01R33/32
CPCG01R33/0029G01R33/0354G01R33/326
Inventor 董慧邱阳黄小磊陶泉李波
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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