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Flux quantum counting device and flux quantum counting method without dead zone time

A magnetic flux quantum and counting device technology, which is applied in the direction of the magnitude/direction of the magnetic field, and the use of superconducting devices for magnetic field measurement, etc., can solve the problems of discontinuous, unknown, and uncontrollable jumps in the measurement data, and achieve optimal structure design and Spatial layout, avoiding working point jumps, and reducing the effects of measurement errors

Active Publication Date: 2016-03-02
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this technology has a relatively simple circuit structure, there is a dead time when the integrator is reset. If the magnetic flux fluctuates more than one Φ0 during this dead time, the measurement data will be discontinuous and unknown, and the result The same as the problem of jumping the working point mentioned above
[0007] To sum up, the existing large-range SQUID readout circuit either has insufficient range, or has the problem of uncontrollable jumping of the working point due to the dead time, which greatly affects the application of superconducting magnetic sensors in the fields of industry, scientific research and medical treatment. wide application and promotion of

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  • Flux quantum counting device and flux quantum counting method without dead zone time
  • Flux quantum counting device and flux quantum counting method without dead zone time
  • Flux quantum counting device and flux quantum counting method without dead zone time

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Embodiment Construction

[0024] 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. 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.

[0025] The superconducting quantum interferometer is a flux-voltage converter based on the Josephson structure. It has two equivalent working modes: voltage bias and current bias. In the current bias working mode, the output at both ends of the SQUID The voltage V changes ...

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Abstract

The invention provides a flux quantum counting device and a flux quantum counting method without dead zone time. Two flux lock loops respectively connected with SQUIDs of different sensitivity are reset and then the working points thereof are locked, a flux interlock unit is employed to make the other flux lock loop in a working point-locked state when one flux lock loop is reset, so that the flux change within the dead zone time from resetting to locking of the reset flux lock loop is acquired, and the working point of the reset flux lock loop after relocking can be compensated and judged. The range of the readout circuit can be extended infinitely within the normal working interval of the SQUIDs through orderly active resetting and relocking, and the linearity in the whole range is improved. Moreover, the risk of working point jump within the dead zone time for the traditional flux quantum counting method is avoided effectively, the structure design and spatial layout of the two SQUIDs of different sensitivity are optimized, and the error of measurement caused by channel crosstalk and magnetic gradient is reduced.

Description

technical field [0001] The invention relates to the technical field of superconducting electronics, in particular to a device and method for realizing magnetic flux quantum counting without dead time based on a superconducting quantum interferometer. Background technique [0002] Superconducting quantum interferometer (SQUID: SuperconductingQUantumInterferenceDevice) is a flux-voltage converter based on the Josephson structure, and it is also the most sensitive magnetic sensor known so far. There are many applications in the field of detection. [0003] In the current bias mode, the output voltage V at both ends of the SQUID changes periodically with the increase of the external magnetic flux Φ, which is the root of its huge range, but the V-Φ characteristic of the SQUID is not linear, usually It needs to be linearized through the flux lock loop (FluxLockLoop) after noise matching to achieve practical purposes, and the main working principle of FLL is to offset the change o...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/035
Inventor 伍俊张国峰荣亮亮蒋坤孔祥燕谢晓明
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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