A squid chip and its detection method

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 improving stability, reducing the number of wires, and avoiding large heat loss

CN105093093BActive Publication Date: 2018-01-30SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2018-01-30

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Abstract

The invention provides a SQUID chip, comprising: a SQUID device; a parallel feedback coil and a heater. When the feedback coil works in the superconducting state, the heater does not work, and the SQUID device detects the magnetic flux signal and converts it into a voltage signal output; when the feedback coil works in the quench state, the heater Heating is started to increase the operating temperature of the SQUID device, and when the temperature of the SQUID device exceeds the superconducting critical temperature, the SQUID device is quenched. The SQUID chip is connected with a sensing circuit to form a SQUID magnetic sensor. The invention connects the heating resistor and the feedback coil in the traditional SQUID chip in parallel, and through parameter matching, the heating resistor and the feedback coil work together to realize dual-function operation, reduce the number of metal leads of the normal temperature circuit and the low temperature circuit, and greatly reduce the temperature of the low temperature circuit. Loss, save cost, increase the maintenance time of low temperature environment, and increase the system running time, which has important economic and application value.
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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] The magnetic sensor based on the superconducting quantum interference device (Superconducting Quantum Interference Device, SQUID) is the most sensitive magnetic detector 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 ...

Examples

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...