SQUID chip and detection method thereof

A detection method and chip technology, applied in the field of magnetic sensors, can solve the problems of limited supply, high cost, and high indirect cost of equipment, and achieve the effects of reducing the number of wires, avoiding large heat loss, and improving stability

Active Publication Date: 2015-11-25
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High cost ($20-30 per liter of liquid helium), limited supply
At the same time, the loss of liquid helium infusion process is large, the system must be shut down to cooperate, the efficiency is low, and the indirect cost of equipment is large

Method used

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  • SQUID chip and detection method thereof
  • SQUID chip and detection method thereof
  • SQUID chip and detection method thereof

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Embodiment Construction

[0038] 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.

[0039] see Figure 4 ~ Figure 8 . It should be noted that the diagrams provided in this embodiment are only schematically illustrating the basic idea of ​​the present invention, and only the components related to the present invention are shown in the diagrams rather than the number, shape and shape of the components in actual implementation. Dimensional drawing, the type, quantity and proportion of each component can be changed arbi...

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Abstract

The invention provides a superconducting quantum interference device (SQUID) chip comprising an SQUID device, a feedback coil, and a heater. The feedback coil and the heater are connected in parallel. When the feedback coil works in a superconducting state, the heater does not work and the SQUID device detects a magnetic flow signal and converts the signal into a voltage signal for outputting. When the feedback coil works in a quenching state, the heater starts to carry out heating so that the working temperature of the SQUID device rises; and when the temperature of the SQUID device exceeds a superconducting critical temperature, the SQUID device is in a quenching state. The SQUID chip and a sensing circuit are connected to form an SQUID magnetic sensor. According to the invention, the heating resistor and feedback coil in the traditional SQUID chip are connected in parallel; and with parameter matching, the heating resistor and the feedback coil works in a cooperation mode, thereby realizing dual-function operation. The metal lead number of the normal-temperature circuit and the low-temperature circuit is reduced so that the low-temperature losses can be substantially reduced and the cost is saved; the low-temperature environment keeping time is improved; and the system operation time is increased. The SQUID chip has the great economical and application value.

Description

technical field [0001] The invention relates to the technical field of magnetic sensors, in particular to a SQUID chip and a detection method thereof. Background technique [0002] Magnetic sensors based on superconducting quantum interference devices (SuperconductingQuantumInterferenceDevice, SQUID) are the most sensitive magnetic detectors known so far. It is widely used in weak magnetic field detection applications such as biological magnetic field, earth magnetic field anomaly, and extremely low-field nuclear magnetic resonance. Its detection sensitivity has reached Feite (10 -15 Tesla) magnitude. SQUID magnetic sensor is an important magnetic sensor device in limit detection and scientific research, and has high scientific research and application value. [0003] SQUID devices must operate at low temperatures that allow them to enter the superconducting state. Such as figure 1 As shown, the SQUID magnetic sensor 1 is composed of a SQUID chip 11 and a readout circuit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/28
Inventor 王永良张国峰孔祥燕谢晓明
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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