Analog comb filter-based magnetic resonance underground water detection device and analog comb filter-based magnetic resonance underground water detection method

Abstract

The present invention relates to the geophysical exploration field, in particular relates to an analog comb filter-based magnetic resonance underground water detection device and an analog comb filter-based magnetic resonance underground water detection method. The analog comb filter-based magnetic resonance underground water detection device comprises a computer, a receiver, a synchronization unit, an emitter, an emission coil connected with the output of the emitter and a reception coil connected with the input of the receiver, wherein the computer sends an instruction to the receiver via a communication interface, the receiver processes an upper computer instruction, and the synchronization unit synchronizes the receiver and the emitter; the receiver controls the reception coil to receive a signal, the signal received by the receiver passes a prepositive amplifying unit, a bandwidth filtering unit, a comb filtering unit and a secondary amplifying unit orderly and then is transmitted by an acquisition card unit to the computer. According to the present invention, by adding a comb filter aiming at a power frequency harmonic in the passband of a broadband amplifier, the power frequency harmonic nearby the signal is suppressed very well, at the same time, the situation that the suppression to an effective signal is minimum is guaranteed.

Description

technical field [0001] The invention relates to the field of geophysical exploration, in particular to a magnetic resonance groundwater detection device and a detection method based on an analog comb filter. Background technique [0002] Magnetic Resonance Sounding (MRS) is currently the only geophysical method that can directly detect groundwater non-destructively. At present, this measurement method can effectively detect groundwater information when the background noise is relatively small. CN102096112A discloses an array coil-based nuclear magnetic resonance groundwater detector and a field detection method. It is formed by connecting the computer through the serial port line or the network port line through the control unit, the transmitting coil and the receiving coil. It can realize not only two-dimensional groundwater imaging, but also three-dimensional groundwater imaging, high-sensitivity acquisition and long-distance data transmission, which improves the accurac...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a magnetic resonance groundwater detection device and detection method based on an analog comb filter. Aiming at the serious power frequency harmonic interference phenomenon in the passband of the amplifier, the minimum impact on the effective signal is provided. Under the premise, the power frequency harmonic signal is suppressed to the maximum to solve the problem that the reliability of the measurement results of the magnetic resonance detection device is relatively low or even impossible to measure when the power frequency noise is relatively large

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