Magnetic resonance three-component noise removing device and noise removing method

Abstract

The invention relates to a magnetic resonance three-component noise removing device. The magnetic resonance three-component noise removing device is formed through a structure. The structure is characterized in that an upper computer is connected with a transmitting coil through a control system, a transmitting circuit and a resonance matching capacitor; the transmitting circuit is connected with a power supply; the control system is connected with a receiving coil and a reference coil respectively through an A/D (Analog to Digital) collection and amplification circuit and a conditioning circuit. The magnetic resonance three-component noise removing device is applicable to a detection area with complex and changeable environment noise and uneven space distribution of the noise; due to the adoption of relevance between x-component signals, y-component signals and z-component signals which are sensed by coils paved in the same detection place, the z-component noise is removed, then filtered and processed to obtain reliable magnetic resonance signals, so that the wiring space is greatly saved and the processing result is flexible and accurate; in particular, when sharp-peak noise with great amplitude exists, the noise removing effect is excellent. Through the magnetic resonance three-component noise removing device, the influence of strong electromagnetic interference near the cities, the villages and the water-deficient areas is eliminated, and the problem of limited application of a nuclear magnetic resonance underground water detection method is solved.

Description

Technical field: [0001] The invention relates to a geophysical detection method and data interpretation thereof, in particular to a data processing method for collecting a three-component nuclear magnetic resonance (NMR) groundwater detection method and using the three-component magnetic resonance to eliminate noise. Background technique: [0002] As a direct groundwater detection method, the NMR groundwater detection method has the advantages of high resolution, high efficiency, rich information and uniqueness. However, since the signal received by the instrument is very weak (nanovolt level), the high-sensitivity receiving device is easily interfered by the noise components of the surrounding environment. China is densely populated, with well-developed power grids, power lines and electrical equipment covering towns and villages, and the electromagnetic interference is serious, while most of the water-scarce areas are located near cities and villages and other strong inter...

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Problems solved by technology

[0006] Aiming at the problem of noise interference in magnetic resonance signals, methods such as laying special-shaped coils and increasing the number of signal superpositions, block cancellation, sine cancellation and notch filters are also used to filter out electromagnetic noise. , these methods achieve better results under certain preconditions, but when the noise intensity is large, the interference components are complex, and the frequency difference between the signal center frequency and the power frequency interference is small, it is difficult to obtain a better filtering effect

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