Focusing type superconducting nuclear magnetic resonance detection device

Abstract

The present invention belongs to the geological survey technical field and relates to a focusing type superconducting nuclear magnetic resonance detection device. The focusing type superconducting nuclear magnetic resonance detection device comprises a high-pressure sealing shell, a control assembly, a refrigeration assembly, a nuclear magnetic signal generating assembly and a temperature control assembly. According to the focusing type superconducting nuclear magnetic resonance detection device of the invention, the pulsed magnetic field intensity can be greatly increased through using the superconductivity of a superconductor, a generated electromagnetic field can be directionally focused through using the complete diamagnetism of the superconductor, and therefore, measurement depth can be increased directionally; and on the other hand, since the resistance of a superconducting receiving coil is approximate to zero resistance, nuclear magnetic resonance weak signals are slowly attenuated in the superconducting receiving coil, namely, the superconducting receiving coil has high sensitivity to the weak signals, and therefore, required low-intensity MRS signals enabling larger exploration depth can be extracted. The device has the advantages of small size, compact structure and high sensitivity, and is especially for tunnel construction, underground construction and so on.

Description

technical field [0001] The invention relates to the technical field of geological survey, in particular to a focusing type superconducting nuclear magnetic resonance detection device. Background technique [0002] In recent years, with the continuous deepening of my country's economic development, the demand for surveys in infrastructure, especially construction, has been increasing. The survey accuracy must be gradually improved, and the survey depth has been gradually increased. NMR (Magnetic Resonance Sounding, MRS) advance prediction is a geophysical cutting-edge technology for direct detection of groundwater. It uses artificially excited electromagnetic fields to make H nuclei in water generate macroscopic magnetic moments with characteristic precession frequencies, and collect late-stage MRS delays through receiving devices. time information to find out the distribution of water at a certain depth. This technology has the characteristics of high sensitivity, good reso...

AI Technical Summary

Problems solved by technology

In the actual production process, limited by the sensitivity of the instrument and signal loss, the magnetic field strength excited by the transmitting coil can generally only reach 50 meters to 100 meters for surveying. At the same time, the electromagnetic signal fed back by the receiving coil is subject to electromagnetic interference such as the geomagnetic field and the external environment. Larger, especially in harsh environments such as tunnels and underground mines, the receiving instrument is often extremely weak with a few microvolts, which makes signal e

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