Superconducting Quantum Interferometer Magnetic Sensing System
A technology of superconducting quantum interference and magnetic sensing, which is applied in the field of magnetic sensing systems and can solve the problem that the SQUID magnetic sensor cannot be used for a long time
Active Publication Date: 2017-12-05
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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Problems solved by technology
[0007] In view of the above-mentioned shortcoming of prior art, the object of the present invention is to provide a kind of superconducting quantum interference device magnetic sensing system, is used to solve the problem that the SQUID magnetic sensor in the prior art cannot be locked for a long time without locking the range where the working zero point is located. The problem of measuring external magnetic flux in the interval
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[0092] One implementation is as follows: Figure 4 As shown, the amplifying unit is a proportional amplifier 1121 connected to the second superconducting quantum interference device 111; then the feedback resistor is connected to the output of the proportional amplifier 1121, and the feedback inductance 1123 is connected to the feedback The resistors 1122 are connected and the second superconducting quantum interference device 111 has mutual inductance; the output terminal of the under-feedback circuit 112 is the output terminal of the proportional amplifier 1121 .
[0093] Specifically, in this embodiment, the under-feedback circuit 112 first amplifies the induction signal induced by the second superconducting quantum interference device 111 by a preset ratio, and then passes the amplified induction signal through the feedback inductance negative feedback to the second superconducting quantum interference device 111 . Wherein, the output terminal of the second superconductin...
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The present invention provides a magnetic sensing system for a superconducting quantum interference device, comprising: a first magnetic sensor including a first superconducting quantum interference device, used for real-time adjustment of the locking operating point of the first superconducting quantum interference device, and every The second magnetic sensor in the same external magnetic flux environment as the first magnetic sensor is used to sense and output all The second induction signal corresponding to the continuous change of the external magnetic flux in the magnetic flux environment; the signal compensation processing unit is used to determine each magnetic flux according to the difference between the magnetic fluxes reflected by the first induction signal and the second induction signal The magnetic flux in the range is relative to the magnetic flux in the preset magnetic flux range, and the change of the first induction signal during the lock-out period is compensated according to the relative magnetic flux obtained, and the compensated first induction signal is output. In order to realize that the present invention can continuously measure high-precision induction signals for a long time.
Description
technical field [0001] The invention relates to a magnetic sensing system, in particular to a magnetic sensing system of a superconducting quantum interference device. Background technique [0002] The sensor using the Superconducting Quantum Interference Device (SQUID for short) is the most sensitive and high-resolution magnetic sensor known so far. Its minimum detectable magnetic field strength reaches Feite (10-15 Tesla) level. It is widely used in the detection and scientific research of weak magnetic signals such as heart magnetism, brain magnetism, and extremely low-field nuclear magnetic resonance. [0003] The DC superconducting quantum interference device (dc SQUID for short) uses two parallel Josephson junctions to form a superconducting ring, and the two ends of the junction are drawn out to form a two-terminal component. The SQUID mentioned below refers to the DC superconducting quantum interference device. . A certain bias current is applied to both ends of t...
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IPC IPC(8): G01R33/035G01R33/025
Inventor 王永良徐小峰孔祥燕谢晓明
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI