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Methods and systems for calibrating and eliminating crosstalk of SQUID (Superconducting Quantum Interference Device) test component

A technology for testing components and calibrating systems, applied to the size/direction of the magnetic field, measuring devices, measuring electrical variables, etc., can solve the problems of incomplete crosstalk calibration and elimination factors, poor measurement accuracy, etc., to improve the accuracy and simplify the measurement steps. Effect

Active Publication Date: 2021-08-17
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of the above-mentioned shortcoming of prior art, the object of the present invention is to provide a kind of calibration of SQUID test component crosstalk, eliminate method and system, be used to solve SQUID measurement system measurement precision difference in the prior art, crosstalk calibration and elimination factor are not enough Comprehensive and other issues

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  • Methods and systems for calibrating and eliminating crosstalk of SQUID (Superconducting Quantum Interference Device) test component
  • Methods and systems for calibrating and eliminating crosstalk of SQUID (Superconducting Quantum Interference Device) test component
  • Methods and systems for calibrating and eliminating crosstalk of SQUID (Superconducting Quantum Interference Device) test component

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Embodiment 1

[0065] Such as figure 1 As shown, the present embodiment provides a calibration system 1 of SQUID test component crosstalk, and the calibration system 1 of the SQUID test component crosstalk includes:

[0066] A power signal source 11 , a three-dimensional Helmholtz coil 12 , a multi-channel SQUID measurement module 13 , a measurement control module 14 and a crosstalk calibration module 15 .

[0067] Such as figure 1 As shown, the power signal source 11 provides an excitation signal.

[0068] Specifically, in this embodiment, the power signal source 11 includes a signal source 111 and a power amplifier 112 . The signal source 111 generates an excitation signal and provides it to the measurement control module 14 . The power amplifier 112 is connected to the output end of the signal source 111 to amplify the excitation signal and provide it to the three-dimensional Helmholtz coil 12 . In actual use, any device capable of generating an excitation signal is applicable to the ...

Embodiment 2

[0078] Such as figure 2 As described above, this embodiment provides a calibration system 1 for crosstalk of SQUID test components. The difference from Embodiment 1 is that the Helmholtz coil is a one-dimensional Helmholtz coil 16, and the SQUID test component The crosstalk calibration system also includes a non-magnetic three-dimensional turntable 17 arranged in the magnetic field area of ​​the one-dimensional Helmholtz coil 16, based on which the non-magnetic three-dimensional turntable drives the multi-channel SQUID measurement module 13 to rotate to generate a sinusoidal magnetic field.

[0079] It should be noted that the other device structures and working principles of the SQUID test component crosstalk calibration system 1 are the same as those in Embodiment 1, and will not be repeated here.

Embodiment 3

[0081] Such as image 3 As shown, the present embodiment provides a system for eliminating crosstalk of SQUID test components, and the system for eliminating crosstalk of said SQUID test components includes:

[0082] A crosstalk elimination module 2 and a calibration system 1 for crosstalk of SQUID test components.

[0083] Such as image 3 As shown, the SQUID test component crosstalk calibration system 1 outputs the output signal of the crosstalking channel, the output signal of the crosstalked channel and the crosstalk coefficient between the channels.

[0084] Specifically, the structure and principle of the calibration system 1 for the SQUID test component crosstalk can be found in Embodiment 1, which will not be repeated here.

[0085] Such as image 3 As shown, the crosstalk elimination module 2 is connected to the output terminal of the SQUID test component crosstalk calibration system, and eliminates the crosstalk of the crosstalked channel by means of physical offs...

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Abstract

The invention provides methods and systems for calibrating and eliminating crosstalk of an SQUID (Superconducting Quantum Interference Device) test component. The calibrating method comprises the following steps: simulating a sinusoidal magnetic field with the same or the same magnitude as the actual measured magnetic field intensity; under the condition that both the channel subjected to crosstalk and the crosstalk channel in the multi-channel SQUID measurement module work normally, measuring output signals of the channel subjected to crosstalk and the crosstalk channel; under the condition that the channel subjected to crosstalk works normally and the crosstalk channel is closed, measuring an output signal of the channel subjected to crosstalk; calculating a crosstalk coefficient between the channel subjected to crosstalk and the crosstalk channel based on the output signal change value of the channel subjected to crosstalk in the presence or absence of crosstalk and the output signal of the crosstalk channel; and repeating the steps to sequentially calculate crosstalk coefficients among the channels in the multi-channel SQUID measurement module, and obtaining a channel crosstalk coefficient matrix of the multi-channel SQUID measurement module. According to the method, the crosstalk calibration precision can be improved, the crosstalk measurement steps are simplified, and the crosstalk of the SQUID measurement system can be accurately calibrated and eliminated as a whole.

Description

technical field [0001] The invention relates to the field of magnetic field detection, in particular to a method and system for calibrating and eliminating crosstalk of SQUID test components. Background technique [0002] Superconducting Quantum Interference Device (SQUID: Superconducting Quantum Interference Device) is a flux-voltage converter based on the Josephson structure. The superconducting magnetic sensor composed of it is the most sensitive magnetic sensor known at present, and can measure very weak Magnetic signals, and SQUID as the core device can also form a superconducting magnetic measurement system, which has many applications in the fields of extremely weak magnetic field detection such as biomagnetism, geophysics and low-field nuclear magnetic resonance. It should be noted that the magnetic measurement system constructed by multiple SQUIDs will have channel crosstalk when the physical space of the detector is limited, which will greatly affect the measuremen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/035G01R35/00
CPCG01R33/0354G01R35/00
Inventor 伍俊荣亮亮邱隆清董慧谢晓明
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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