Nuclear magnetic resonance ground water detection system with reference coils and detection method

Abstract

The invention relates to a nuclear magnetic resonance ground water detection system with reference coils and a detection method. All-waveform data of nuclear magnetic resonance signals in a transmitting / receiving coil and noise signals in the reference coils are synchronously acquired through a plurality of paths of A / D acquiring units; the distribution of optimal positions and quantity of the reference coils is realized through calculating the maximum correlation of the noise signals and the nuclear magnetic resonance signals, which are acquired by the reference coils; and under the condition of unknown signal and noise statistical properties, noise in the nuclear magnetic resonance signals obtained by the transmitting / receiving coil is maximally offset by adopting a variable step adaptive algorithm, the nuclear magnetic resonance signals are extracted under the interference of multi-field source complex strong noise, thus the problems of multiple interferences of nuclear magnetic resonance detection near villages and in neighboring regions of cities and difficulty of separating multiple kinds of interference noise data are effectively solved, the interference resistance of instruments is improved, and a reliable detection device and method are provided for searching underground water near villages and in neighboring regions of cities.

Description

technical field [0001] The invention relates to a nuclear magnetic resonance detection system for searching groundwater, in particular to a nuclear magnetic resonance groundwater detection system and a detection method with a reference coil. Background technique [0002] The nuclear magnetic resonance (Nuclear Magnetic Resonance, referred to as NMR) groundwater detection method is a geophysical method for directly exploring groundwater. Compared with traditional geophysical groundwater exploration methods, it has high resolution, high efficiency, rich information and unique solution Advantages: the depth, thickness, water content, and average porosity of the aquifer can be determined without drilling, and the cost of completing a nuclear magnetic resonance sounding point is only 1 / 10 of the cost of a hydrogeological exploration drilling. [0003] However, in the NMR groundwater detection method, the detection object is the spin magnetic moment of the underground atomic nucle...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to address the deficiencies of the above-mentioned prior art, to provide a nuclear magnetic resonance groundwater detection system and detection method with a reference coil, to solve the problem of effective extraction of nuclear magnetic resonance signals under the interference of complex multi-field sources near villages and surrounding cities problem

Images