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Induction coil of SQUID device

A technology of induction coils and devices, which is applied in the field of electromagnetic fields, can solve the problems of reducing SQUID sensitivity and measurement sensitivity, and achieve the effects of wide application range, low thermal conductivity, and easy design and processing

Inactive Publication Date: 2020-04-17
中国船舶重工集团有限公司第七一0研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional method is to use a flux transformer for flux coupling. The flux transformer can change the inductance of the induction coil and the input coil. Relatively speaking, the size and structure of the induction coil can be designed according to the size of the measured magnetic field, but the flux transformer Bring additional noise and reduce the sensitivity of SQUID. If the coupling coefficient of the flux transformer is 0.9, the sensitivity may drop by an order of magnitude; the direct coupling method will cause a large drop in measurement sensitivity due to the mismatch between the induction coil and the inductance

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  • Induction coil of SQUID device
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  • Induction coil of SQUID device

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Embodiment Construction

[0016] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0017] This embodiment provides a SQUID device induction coil, such as figure 2 As shown, the induction coil is connected in series with the SQUID device through the connection contact of the SQUID device, and constitutes a SQUID magnetic flux measurement circuit with the SQUID device. By measuring the magnetic flux of the induction coil and the area of ​​the induction coil, the measured magnetic field is calculated.

[0018] The induction coil is made of superconducting metal niobium (or lead, niobium-titanium alloy), the purity of the superconducting metal (or alloy) is greater than 99.999%, and its residual magnetic permeability (RRR value) is greater than 350. The wire diameter of the induction coil is less than 0.05mm, and it is wound in a dense way.

[0019] External flux Φ ext into the inductance L p The induction coil 6 generates a current I i...

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Abstract

The invention discloses an induction coil of an SQUID device. The induction coil is connected with the SQUID device in series through a connecting contact of the SQUID device. The induction coil is amulti-turn coil, the number n of turns of the coil meets the condition that n equals the square root of Li / Lp, wherein lp is the inductance of the single-turn coil, and Li is the inductance of the input coil of the SQUID device. The magnetic field measurement sensitivity can be improved.

Description

technical field [0001] The invention belongs to the field of electromagnetic fields, and in particular relates to an induction coil of a SQUID device. Background technique [0002] The superconducting magnetometer designed with SQUID (Superconducting Quantum Interference Device) device has the highest sensitivity at present, and can measure feta-level magnetic field. The superconducting magnetometer can be used to measure brain magnetism, heart magnetism, and geological rock magnetic field and other ultra-low magnetic field measurements. Now the SQUID device is made by coating, the structure diagram is as follows figure 1 As shown, it generally includes input coil 2, SQUID junction 3, signal processing circuit 4, magnetometer voltage output 5, and induction coil connection contact 1. The induction coil must be designed according to the needs of the magnetic field value. [0003] The traditional method is to use a flux transformer for flux coupling. The flux transformer can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/035
CPCG01R33/0358
Inventor 韩晓东程华富张晓锋车振顾清
Owner 中国船舶重工集团有限公司第七一0研究所