Superconductive device capable of increasing exploration depth of nuclear magnetic resonance instrument in coal roadway and signal extraction method

Abstract

The invention discloses a superconductive device capable of increasing the exploration depth of a nuclear magnetic resonance (NMR) instrument in a coal roadway and a signal extraction method. An NMR signal is very weak, a coal mine underground environment is severe, a large amount of electromagnetic interferences exist, the space is finite, and gas and coal dust explosion occurs occasionally, so that a large-coil sensor comprising multiple turns of copper wires and used on the ground is unlikely to play a due role in the coal roadway. The invention provides the superconductive device capable of receiving the NMR signal in the coal roadway. The superconductive device comprises multiple turns of hollow helical pipeline coils formed by winding niobium-titanium or niobium-tin alloy wires, the hollow helical pipeline coils are 3.5 meters in diameter, the coils are put into a low-temperature dual-layer liquid helium Dewar flask and become a superconductor, and the electrical resistivity in a superconductive coil is close to zero; in order to reduce the weight, a superconductive wire is hollow rather than solid. Least square wavelet transform is applied to five-stage decomposition of an actually measured signal with interference, and the relatively large maximum value in fourth-stage decomposition is the NMR signal (8).

Description

[0001] 1. Technical field: The present invention relates to a superconducting device and a signal extraction method for improving the exploration depth of a coal roadway nuclear magnetic resonance instrument. Exploration Geophysics" (code: 1702065), ie, applied geophysics (geophysical prospecting, geophysical prospecting). 2. Background technology: [0002] The basic principle of nuclear magnetic resonance (Nuclear Magnetic Resonance, NMR) to find water is to use the artificially excited electromagnetic field to make the hydrogen nuclei in the groundwater form a macroscopic magnetic moment. Unique to the nuclear institute, the nuclear magnetic resonance signal generated by the precession of the macroscopic magnetic moment can be picked up by the coil to detect the existence of groundwater, which forms a method and instrument for directly finding water. At present, the exploration depth of the nuclear magnetic resonance (NMR) water finding instrument is only 100 meters to 150 m...

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In the wild, some areas are too noisy to obtain reliable measurements

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