Linear current source excitated multi- path receiving ground magnetic nuclear resonance method and system

Abstract

The invention relates to a method for a wire power source multichannel receiving ground nuclear magnetic resonance and a system thereof. The method comprises the following the steps that: 1) a transmitter is used to supply alternating current with Larmor frenquency to the underground through two embedded emission electrodes, and the distance of the electrodes and the current are changed to generate different excited magnetic fields; 2) the excited magnetic fields are broken, and signals which are in exponential decaying laws are received through a high-sensitive probe in the process that excited protons are precessed into a normal balanced state; 3) the signals are transmitted to a receiver through signal transmission lines, and received signals of the receiver are sent to a signal processing and imaging system to carry out treatments to the signals, such as pretreatment, denoising, inversion, imaging, etc. The method for the wire power source multichannel receiving ground nuclear magnetic resonance and the system thereof have the advantages that: small volume of meticulous exploration underground can be provided; the method and the system thereof have the characteristics of high efficiency of multichannel receiving work, large explorating space, and is favorable for three-dimensional inversion imaging and so on; the wire power source are excited so that construction is flexible and simple; the efficiency of the multichannel receiving work is high; and an aim of exploration is realized through changing emission current.

Description

Line power excitation multi-channel receiving ground nuclear magnetic resonance method and system technical field The invention relates to the field of nuclear magnetic resonance, in particular to a method and system for exciting multi-channel receiving ground nuclear magnetic resonance by a line power supply. Background technique The surface nuclear magnetic resonance method has a history of more than 30 years, and has achieved good application results in many fields, especially in the study of hydrogeological problems. However, the ground NMR method at home and abroad is to supply an alternating current with a frequency of Larmor frequency to the coil (transmitting coil) laid on the ground, and under the excitation of the alternating magnetic field formed by the underground alternating current, the groundwater The hydrogen nuclei form a macroscopic magnetic moment, which produces a precession motion in the geomagnetic field. After the alternating current is cut off, the ...

AI Technical Summary

Problems solved by technology

The object of the present invention is to provide a method and system for exciting multi-channel receiving ground nuclear magnetic resonance with a line power supply, so as to overcome the problems existing in the existing ground nuclear magnetic resonance method and system that cannot effectively detect small-volume underground water bodies or structures at a certain depth and the existence of instruments and equipment Inadequacies such as bulky and heavy field construction work

Images