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SQUID detection module and SQUID sensor

A detection module and sensor technology, which is applied in the field of SQUID detection, can solve the problems of difficult coil design, large number of coils, and the performance impact of SQUID sensors, and achieve the goals of reducing magnetic flux leakage, reducing magnetic flux interference and coupling, and simplifying design difficulty Effect

Inactive Publication Date: 2020-02-28
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In view of the above-mentioned shortcoming of prior art, the object of the present invention is to provide a kind of SQUID detection module and SQUID sensor, be used to solve the problems such as large number of coils in the prior art, coil design difficulty is big, the performance of SQUID sensor is affected

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  • SQUID detection module and SQUID sensor
  • SQUID detection module and SQUID sensor

Examples

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Embodiment 1

[0044] Such as image 3 As shown, the present embodiment provides a SQUID detection module 3, and the SQUID detection module 3 includes:

[0045] SQUID device 31 and superconducting coil ring 32 .

[0046] Such as image 3 As shown, the SQUID device 31 is used to induce the magnetic flux detected by the superconducting coil ring 32 and convert it into an electrical signal.

[0047] Specifically, the SQUID device 31 includes a first Josephson junction and a second Josephson junction connected in parallel, the first Josephson junction and the second Josephson junction are connected by a superconducting wire, and the first Josephson junction The junction and the two connection nodes of the second Josephson junction are used as lead terminals, leading to the first output terminal S+ and the second output terminal S- respectively; the SQUID device 31 converts the magnetic flux induced by it into a voltage signal.

[0048] Such as image 3 As shown, the superconducting coil loop...

Embodiment 2

[0054] Such as Figure 5 As shown, this embodiment provides a SQUID detection module 3. The difference from Embodiment 1 is that the first superconducting coil unit of this embodiment includes a third auxiliary coil, and the second superconducting unit includes The search coil and the input coil are connected in series.

[0055] Such as Figure 5 As shown, in this embodiment, the first superconducting coil unit 321 includes a third auxiliary coil L3; the second superconducting coil unit 322 includes a detection coil Lp and an input coil Li, and the detection coil Lp and the The input coil Li is connected in series. The detection coil Lp, the input coil Li and the third auxiliary coil L3 are connected end to end to form a loop. The connection node between the detection coil Lp and the third auxiliary coil L3 serves as the first feedback terminal F+, and the connection node between the input coil Li and the third auxiliary coil L3 serves as the second feedback terminal F- . ...

Embodiment 3

[0058] Such as Figure 6 As shown, the present embodiment provides a kind of SQUID sensor, and described SQUID sensor comprises at least:

[0059] SQUID detection module 3 and readout module 4 .

[0060] Such as Figure 6 As shown, the SQUID detection module 3 detects the measured magnetic field and converts it into a corresponding electrical signal.

[0061] Specifically, the structure of the SQUID detection module 3 is the same as in Embodiment 1 ( Figure 6 Only the case without the first auxiliary coil L1 and the second auxiliary coil L2 is shown, and the case with the auxiliary coil is applied in the same way), and will not be repeated here. The detection coil Lp detects the measured magnetic field, and forms a loop current in the superconducting coil loop 32 (the loop current is proportional to the magnetic flux Φp of the measured magnetic field), and the loop current is transmitted to the input coil Li, so The input coil Li converts the loop current into magnetic fl...

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Abstract

The invention provides an SQUID (Superconducting Quantum Interference Device) detection module and an SQUID sensor. The SQUID detection module comprises an SQUID device and a superconducting coil ring, and the SQUID device senses a magnetic flux detected by the superconducting coil ring and converts the magnetic flux into an electric signal; and the superconducting coil ring comprises a first superconducting coil unit and a second superconducting coil unit which are connected end to end, and the connection node of the first superconducting coil unit and the second superconducting coil unit isused as a lead terminal to receive a feedback signal. According to the SQUID detection module and the SQUID sensor, a feedback coil is not needed, ports and cost are saved, the layout design difficulty is simplified, the process difficulty is reduced, and the rate of finished products is increased; and direct electric feedback is adopted, so that magnetic flux leakage is reduced, the SQUID detection module and the SQUID sensor have important significance for multi-channel application, magnetic flux interference and coupling among channels can be greatly reduced, the problem of signal crosstalkamong the channels is solved, and the difficulty of system signal extraction is reduced.

Description

technical field [0001] The invention relates to the field of SQUID detection, in particular to a SQUID detection module and a SQUID sensor. Background technique [0002] Magnetic sensors based on superconducting quantum interference devices (Superconducting Quantum Interference Device, hereinafter referred to as SQUID) are the most sensitive magnetic sensors known at present, among which the sensitivity of low-temperature superconducting SQUID is better than 10 fetatometry, and the sensitivity of high-temperature superconducting SQUID is better than 100 Fett. SQUID magnetic sensor is an important high-end application sensor, which is widely used in biomagnetism, geophysical detection, extremely low-field nuclear magnetic resonance and other weak magnetic field detection fields, and has high scientific research and application value. [0003] A traditional dc SQUID sensor chip 1 includes a SQUID device, an input coil Li and a feedback coil Lf. [0004] Such as figure 1 Sho...

Claims

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Application Information

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IPC IPC(8): G01R33/035
CPCG01R33/0356
Inventor 王永良张树林张国峰荣亮亮谢晓明
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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