Radio frequency receiving coil probe and system for nuclear magnetic resonance transformer oil detection

Abstract

The invention relates to a radio frequency receiving coil probe and system for nuclear magnetic resonance transformer oil detection. The probe comprises a receiving coil, a tuning matching circuit and a balun circuit, the receiving coil is composed of two coils which are identical in geometric dimension, number of turns and inductance and opposite in winding direction, and the receiving coil generates a radio frequency signal in a differential form based on the nuclear magnetic resonance technology. Two coils in the receiving coil are respectively a first coil and a second coil, and the first coil is a working coil and is wound on an insulating pipeline in which transformer oil to be detected flows; the second coil serves as a reference coil and a compensation coil and is in a vacant state; a balance signal matched with the working frequency of the nuclear magnetic resonance spectrometer is extracted from the radio frequency signal through a tuning matching circuit; and the balanced signal is sent to the input port of the balun circuit, and a single-ended unbalanced signal with interference suppression is output. Compared with the prior art, the method has the advantages of realizing interference suppression in the transformer oil detection process at low cost and the like.

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