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SQUID magnetic sensor measuring sensitivity enhancement method, device and system

A magnetic sensor and sensitivity technology, applied in the field of magnetic field sensing, can solve the problem of low detection sensitivity of weak signals, and achieve the effect of improving measurement sensitivity and high-sensitivity detection

Active Publication Date: 2015-11-04
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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Problems solved by technology

[0006] In view of the shortcomings of the prior art described above, the object of the present invention is to provide a method, device and system for improving the measurement sensitivity of a SQUID magnetic sensor, which is used to solve the problem of detection sensitivity to weak signals caused by the existing SQUID sensor working in a large range. low problem

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Embodiment

[0035] The invention provides a method for improving the measurement sensitivity of a SQUID magnetic sensor, such as figure 2 As shown, the method for improving the measurement sensitivity of the SQUID magnetic sensor comprises:

[0036] A three-axis magnetometer is used to convert the background magnetic field into an electrical signal; the background magnetic field includes an ambient magnetic field and a signal magnetic field. What the present invention adopts is common orthogonal three-axis magnetometer, detects the magnetic field component Bx, By, Bz of the environmental magnetic field respectively in X, Y, Z axis; Bx, By, Bz are three orthogonal portion.

[0037] The present invention requires as follows to described triaxial magnetometer:

[0038] First of all, the range of the three-axis magnetometer should be large enough to meet the requirements of tracking the fluctuation of the environmental magnetic field without overflow;

[0039] Secondly, the sensor of the ...

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Abstract

The invention provides an SQUID magnetic sensor measuring sensitivity enhancement method, device and system. The method comprises the steps that a background magnetic field is converted into electric signals by utilizing a triaxial magnetometer; the background magnetic field comprises an environment magnetic field and a signal magnetic field; the electric signals are conditioned and then main electric signals reflecting the environment magnetic field are acquired; the main electric signals are converted into an environment deduction magnetic field; and the deduction magnetic field is inputted to an SQUID magnetic sensor to counteract magnetic flux generated in the SQUID magnetic sensor by the environment magnetic field. Information of the environment magnetic field is acquired by using the triaxial magnetometer. Certain compensating magnetic flux is generated via a low-pass filter and a current compensating circuit and exactly counteracts magnetic flux of the external environment magnetic field with which the SQUID magnetic sensor is coupled so that the SQUID magnetic sensor is enabled not to respond to high fluctuation of the environment magnetic field, working at a small-range and high-sensitivity mode can be realized, and high-sensitivity detection of weak measured signals can be realized.

Description

technical field [0001] The invention belongs to the technical field of magnetic field sensing, and relates to a magnetic sensor measurement method and system, in particular to a method, device and system for improving the measurement sensitivity of a SQUID magnetic sensor. Background technique [0002] A sensor using a superconducting quantum interference device (Superconducting Quantum Interference Device, hereinafter referred to as SQUID) is the most sensitive magnetic sensor known so far. It is widely used in the detection of extremely weak magnetic signals and the study of extremely weak magnetic field anomalies, such as heart magnetism, brain magnetism, extremely low-field nuclear magnetic resonance, and geophysical magnetic detection. [0003] figure 1 It is a typical SQUID flux-voltage conversion FLL (Flux-Locked Loop, flux-locked loop) circuit, which is composed of a SQUID device, a preamplifier, an integrator, a feedback resistor Rf and a feedback coil, and is a fl...

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Application Information

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IPC IPC(8): G01R33/035
Inventor 王永良孔祥燕徐小峰谢晓明
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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