Wide-dynamic-range high-temperature superconducting magnetometer

Abstract

The invention relates to a wide-dynamic-range high-temperature superconducting magnetometer comprising a superconducting quantum probe, a liquid nitrogen Dewar flask, a readout circuit, a data collection system and a micro-processor, wherein the superconducting quantum probe is arranged in a Helmholtz coil, more particularly, the superconducting quantum probe is connected with the Helmholtz coil via the liquid nitrogen Dewar flask, the readout circuit, the data collection system, the micro-processor, a constant-current source gear-selecting circuit and an adjustable constant-current source; and the readout circuit is formed by connecting a signal processing circuit with the constant-current source gear-selecting circuit. By using the standard magnetic field generated by the Helmholtz coil, part of the external magnetic field to be measured can be neutralized, and the value of the residual magnetic field to be measured after neutralization can be always within the dynamic range of the high-temperature superconducting magnetometer, the actual value of the magnetic field to be measured can be obtained by adding the value of the neutralized magnetic field to the detection value of the high-temperature superconducting magnetometer, thus preventing the sensitivity and accuracy of the high-temperature superconducting magnetometer from being reduced, widening the dynamic range thereof and meeting the operation requirements thereof within various measurement environments. Above all, the high-temperature superconducting magnetometer is suitable for the geophysical exploration in field sections where the electromagnetic interference is high.

Description

Technical field: [0001] The invention relates to a high-temperature superconducting magnetometer for geophysical magnetic exploration, in particular to a high-temperature superconducting magnetometer with a wide dynamic range. Background technique: [0002] Superconducting quantum interference device (SQUID) is the most sensitive sensor for weak magnetic measurement so far. The high-temperature superconducting magnetometer made of high-temperature SQUID working in a liquid nitrogen environment can be used in biomagnetism (such as magnetism, brain magnetism) measurement, non-destructive flaw detection, magnetic exploration, and military potential exploration and other fields. The existing high-temperature superconducting magnetometer used for geophysical magnetic exploration includes a SQUID probe, a liquid nitrogen Dewar bottle, a SQUID readout circuit, a data acquisition system and a microprocessor. However, in order to ensure high sensitivity and precision of this high te...

AI Technical Summary

Problems solved by technology

However, the shielding room made of high-permeability metal materials is extremely expensive, and the performance of the high-temperature superconducting magnetometer itself has not been improved. It can only be used for the measurement of weak biological magnetic signals, and is not suitable for field magnetic exploration.

Images