Three-dimensional power frequency interference source quantitative orientation device and measurement method for nuclear magnetism

Abstract

The invention relates to a three-dimensional power frequency interference source quantitative orientation device and measurement method for nuclear magnetism. The device comprises a vertical receivingcoil which receives a vertical power frequency interference signal, an east-west receiving coil which receives an east-west power frequency interference signal, a north-south receiving coil which receives a north-south power frequency interference signal, a collection circuit which collects power frequency interference signals of vertical, east-west and north-south directions, an upper computer which calculates a possible power frequency interference source vector according to the component vectors in the three directions collected by the collection circuit, a main controller which controls auniversal tripod head to rotate according to the possible vector direction according to an instruction of the upper computer, receives the power frequency interference signals through a universal receiving coil, and transmits the signals to the upper computer through the collection circuit. According to the device, power frequency interference signals existing in a space can be accurately positioned, the magnitude and size of a power frequency interference resource can be measured, finding and eliminating the power frequency interference source in nuclear magnetic resonance detection are facilitated, and the signal noise generated by power frequency interference is reduced.

Description

technical field [0001] The invention belongs to the field of geophysical detection instruments, in particular to a three-dimensional power frequency interference source quantitative orientation device and measurement method for nuclear magnetic. Background technique [0002] The detection of groundwater by nuclear magnetic resonance is a method of directly detecting groundwater, which has the characteristics of high efficiency, fast, high resolution, and intuitive results. With the increasingly serious problem of water shortage, nuclear magnetic resonance detection of groundwater has a broader development space The basic principle of nuclear magnetic resonance detection of groundwater is that hydrogen protons in the water undergo a transition under the polarization of the secondary magnetic field and then return to a low-energy state to produce a large number of energy quanta with Larmor frequency. At this time, the receiving coil on the ground The sensed MRS signal is the d...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a quantitative orienting device and method for three-dimensional power frequency interference sources for NMR, and to solve the problem in the prior art that the strongest power frequency interference signals cannot be detected and eliminated in the entire three-dimensional space

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