Lock-losing reset compensation device and method of SQUID magnetic sensor

Abstract

The invention provides a lock-losing reset compensation device and method of an SQUID magnetic sensor. The device comprises a reference SQUID magnetic sensor, a second SQUID device, a second feedback coil and a second read-out circuit. The second SQUID device and the SQUID magnetic sensor share one signal input coil, and the coupling degree between the second SQUID device and the signal input coil is lower than the coupling degree between an SQUID device in the SQUID magnetic sensor and the signal input coil. The second feedback coil and the second read-out circuit convert magnetic flux induced by the second SQUID device into a second voltage signal. According to the characteristic that working points of a first SQUID magnetic sensor respectively before and after lock-losing are different by N (N is an integer) magnetic flux quanta, A lock-losing compensation module utilizes the variable quantity of the second voltage signal to obtain the offset amount of the working points of the first SQUID magnetic sensor respectively before and after lock-losing, so that the working points of the first SQUID magnetic sensor after the lock-losing are compensated to be consistent with the working points before lock-losing. According to the invention, continuous measurement of the SQUID magnetic sensor before and after lock-losing reset is realized, and the high sensitivity and the large measuring range of the SQUID magnetic sensor are realized.

Description

technical field [0001] The invention belongs to the technical field of magnetic sensors, and relates to a SQUID magnetic sensor, in particular to an out-of-lock reset compensation device and method for a SQUID magnetic sensor. Background technique [0002] A sensor using a superconducting quantum interference device (Superconducting Quantum Interference Device, hereinafter referred to as SQUID) is the most sensitive magnetic sensor known at present. It is widely used in the detection of extremely weak magnetic signals and the study of extremely weak magnetic field anomalies, such as heart magnetism, brain magnetism, extremely low-field nuclear magnetic resonance, and geophysical magnetic detection. SQUID devices have extremely high sensitivity and are important components for current scientific research and high-end magnetic measurement, and have extremely high application value. However, the actual environmental magnetic field fluctuates greatly. In order to make the SQUI...

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide an out-of-lock reset compensation device and method for a SQUID magnetic sensor, which is used to solve the problem that the working point of the existing SQUID magnetic sensor jumps before and after the out-of-lock reset. Problems with implementing continuous measurements

Images