Noise suppression system and method suitable for proton magnetic precession signals

Abstract

The invention provides a noise suppression system and method suitable for proton magnetic precession signals. A dynamic nuclear polarization sensor receives excitation signals sent by an excitation circuit; proton magnetic precession signals are sensed; the signals are transmitted to a tuning circuit; the tuning circuit tunes the signals and transmits the tuned signals to an amplification circuit;the amplification circuit amplifies the signals; a narrowband filter performs band-pass filtering on the amplified signals to remove noises outside a central frequency band, and transmits the signalsto a comparison circuit; the comparison circuit shapes the signals processed by the narrow-band filter into square waves and transmits the signals to an FPGA; the FPGA performs later-stage signal processing; a collector is connected with a controller and performs data acquisition and processing; the controller is connected with the excitation circuit and controls the start and stop of the excitation signals; the controller is connected with the FPGA; the FPGA performs frequency measurement on the proton magnetic precession signals which have been shaped into the square waves and converts a measured frequency value into a magnetic field value; and the controller is connected with the narrow-band filter and adjusts the narrow-band center frequency of the narrow-band filter.

Description

technical field [0001] The invention relates to the technical field of weak magnetic field measurement, in particular to a noise suppression system and method suitable for proton magnetic precession signals. Background technique [0002] The proton precession type magnetometer is a magnetic field measuring instrument used to measure slowly changing weak magnetic fields or constant weak magnetic fields, and its sensor, the proton precession type sensor, is an inductive element. The measurement principle is to use certain excitation conditions to make the protons in the solution where the inductor is in an activated state. After the excitation conditions are removed, the protons will perform Larmor precession around a stable external magnetic field, that is, the earth's magnetic field, and generate proton magnetic precession signals. The precession frequency is proportional to the external magnetic field; therefore, the external magnetic field value can be obtained by using th...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a noise suppression system and method suitable for proton magnetic precession signals in view of

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