Nuclear magnetic resonance and transient electromagnetism integrated detecting instrument and operating method

Abstract

The invention discloses a nuclear magnetic resonance and transient electromagnetism integrated detecting instrument. The detecting instrument comprises a mainframe, a transmitting coil, a receiving probe and an upper computer system, wherein the mainframe comprises a transmitting module for outputting nuclear magnetic resonance excited pulse and transient electromagnetism excited pulse, a receiving module for gathering nuclear magnetic resonance and transient electromagnetism response signals, and a communication module for realizing interaction of command and data between the upper computer system and a control module of the mainframe; the transmitting module provides pulse output for the transmitting coil; the receiving module performs pre-filtering amplifying processing on signals gathered by the receiving probe, and transmits processed signals to the control module. The detecting instrument abandons the traditional single frequency sine wave exciting mode in terms of transmission of nuclear magnetic resonance excited pulse, thereby cancelling a resonance circuit in a large size, and is beneficial to the work development in tunnels with complex construction conditions. A coil bracket carrying a plurality of probes at the same time, designed together with the detecting instrument, has the advantage of capability of meeting the observation requirement on multi-probe array simultaneous reception.

Description

technical field [0001] The invention relates to a nuclear magnetic resonance and transient electromagnetic integrated detection instrument and a working method. Background technique [0002] With the proposal and further implementation of the "One Belt, One Road" strategy, my country will build a large number of tunnel projects in railway and highway transportation, water conservancy and hydropower, energy mines, municipal engineering and other fields. With the emergence of a large number of deep and long tunnel projects in mountainous and karst areas with complex terrain and geological conditions, water and mud inrush disasters in tunnels have shown the characteristics of "large buried depth, strong karst, high water pressure, and large flow" . How to directly, accurately and quantitatively identify the water quantity and occurrence information of the disastrous geological body in front of the tunnel face in the advanced prediction of tunnel water and mud inrush has import...

AI Technical Summary

Problems solved by technology

In the process of implementation, two discrete modules are built in a set of instruments, which are responsible for the transmission and reception of nuclear magnetic resonance and transient electromagnetics, and the instrument system is complex.

[0008] Fourth, because the traditional nuclear magnetic resonance uses a single-frequency sinusoidal pulse to excite the nuclear magnetic resonance response of the underground water-bearing body, the transmitter of the instrument needs a bulky resonant capacitor module; thus the volume and weight of the instrument are greatly increased, which is not conducive to the tunnel in the complex construction environment. The development of advance forecasting of water and mud inrush

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