Four-channel nuclear magnetic resonance signal full-wave acquisition system and acquisition method

Abstract

The invention relates to a four-channel nuclear magnetic resonance signal full-wave acquisition system and acquisition method. The system is constructed in such a way that a computer is connected with a first controller; the first controller is connected with a power management module through a high-speed digital I / O card and a second controller; the first controller is respectively connected with broadband amplifiers through an acquisition card; and the computer is connected with a GPS module through the second controller. A preamplifier effectively resists amplifier saturation, by use of Q_SWITCH, the dead zone time is shortened, the signal-to-noise ratio is improved, the synchronization precision is improved, false triggering is prevented, noise signals are remotely transmitted by use of currents, the signal attenuation during a transmission process is effectively inhibited, data processing is performed on acquired nuclear magnetic resonance signals by use of a self-adaptive reference de-noising algorithm, the anti-interference capability of an instrument is enhanced, the dynamic scope of the instrument is improved, it is possible that a nuclear magnetic resonance method can be applied to a large-noise area, and the transverse resolution and accuracy of measuring underground water body distribution are effectively improved. Multi-channel measuring improves the working efficiency, and the positioning of an underground water body is accurate.

Description

Technical field: [0001] The invention relates to a geophysical exploration equipment and method, in particular to a geophysical exploration equipment and method which can effectively suppress amplifier saturation by setting different magnifications, and realize self-adaptive reference denoising by laying reference coils. Background technique: [0002] The nuclear magnetic resonance detection method is currently the only direct groundwater detection method. It can effectively detect landslides and dam seepage. It provides a direct and effective detection method for water search in arid areas. The collected nuclear magnetic resonance signals can be inverted by analyzing Rich groundwater information, but the nuclear magnetic resonance signal is very weak, easily interfered by various noises in the environment, and easily causes the saturation of the amplifier, thus distorting the collected signal; moreover, the traditional single-channel nuclear magnetic resonance signal acquisi...

AI Technical Summary

Problems solved by technology

The above methods are all capable of two-dimensional and three-dimensional NMR measurements, but when the ambient noise is large, the amplifier is likely to be saturated; due to the long distance between the reference coil and the receiver, when the analog signal is directly transmitted in voltage mode, it will be mixed with Environmental noise; the transmitter and receiver use line synchronization, and when transmitting a large current, it is easy to trigger by mistake; when measuring in a large range, the work efficiency is low

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