Superconducting quantum interference device testing device and testing method
A superconducting quantum interference and testing device technology, which is applied in the field of gravity testing, can solve the problems that the testing device cannot meet the shielding requirements, and achieve the effects of simple structure, stable working environment and simple method
Pending Publication Date: 2022-06-28
CHINA AGRI UNIV
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Problems solved by technology
SQUID is very sensitive to temperature changes and electromagnetic signals, and conventional test devices cannot meet the corresponding shielding requirements
Method used
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[0032] The entire SQUID test device is packaged in a vacuum chamber for testing. The outer low-temperature low-temperature heating wire and the low-temperature temperature sensor and sensor are used to control the temperature of the entire test device. The inner temperature sensor is used to ensure that the SQUID is in a superconducting state, and the superconducting coil wire passes through. The lead hole of the shielding layer of the superconducting coil is drawn out, and the lead can be connected to the signal generator for SQUID testing. The specific operations are as follows:
[0033] The SQUID to be tested is placed in the SQUID shielding layer 11, and bolted and fixed through the screw holes. The low temperature temperature sensor is pasted on the SQUID shielding layer 11, and the superconducting coil lead, SQUID lead, and temperature sensor lead are insulated. Put the outer electromagnetic shielding layer on top, and lead the lead out from the lead hole 12 of the SQUID...
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Abstract
The invention discloses a testing device and a testing method for a superconducting quantum interference device, and belongs to the field of superconducting magnetic measurement. The testing device comprises an outer integral shielding layer, an inner integral shielding layer, an SQUID shielding layer, an SQUID shielding cover, a superconducting coil shielding layer and an integral hoist, and the whole testing device can be fixed in a vacuum cavity filled with liquid helium through the integral hoist. And overall temperature monitoring and control are realized through the two low-temperature temperature sensors. The superconducting coil provides a test signal, and the superconducting coil shielding cover provides good electromagnetic and signal shielding. Measurement of the relation between the SQUID output signal and the input signal is realized. The device is simple in structure, the method is simple and convenient, the multiple electromagnetic shielding layers provide a good electromagnetic environment for the SQUID, related tests of the SQUID are achieved through the superconducting coil, the whole testing device can provide a stable working environment for the SQUID, and effective output of the SQUID is guaranteed.
Description
technical field [0001] The invention belongs to the technical field of gravity testing, in particular to a testing device and a testing method for a superconducting quantum interference device, in particular to a testing device for a superconducting quantum interference device applied to superconducting magnetic levitation monitoring. Background technique [0002] The discovery of the Josephson effect extends the application of superconductivity to the field of weak electricity and weak magnetism. Superconducting Quantum Interference Devices (SQUID) is a superconducting electronic device developed with the Josephson junction as the core part. It is currently the most sensitive commercial magnetic sensor, and is widely used in biomedicine, space exploration, earth exploration, precision measurement and other fields due to its extremely high sensitivity. SQUID is used in high-precision gravity monitoring instruments such as superconducting gravimeters, which can greatly improv...
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IPC IPC(8): G01R35/00G01R33/035H01F6/06
CPCG01R35/00G01R33/0358H01F6/06Y02E40/60
Inventor 李春燕张鸥何志巍
Owner CHINA AGRI UNIV