# US 10,310,131 B2 · Surface nuclear magnetic resonance system excited by geoelectric field for groundwater detection and field detection method

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,310,131 B2
- Document ID: US10310131B2
- Status: Granted
- Kind: B2
- Application number: 15/796,438
- Filed: 2017-10-27
- Published: 2018-07-05
- Granted: 2019-06-04
- Earliest claimed: 2017-01-03
- Assignees: Jilin University
- Applicants: Jilin University
- Inventors: Tingting Lin; Yang Zhang; Ying Yang; Hongyu Wang; Kun Zhou; Ling Wan
- Web page: https://patentgrep.com/patent/US10310131B2

## CPC

- G01V 3/14: operating with electron or nuclear magnetic resonance
- G01N 24/081: {Making measurements of geologic samples, e.g. measurements of moisture, pH, porosity, permeability, tortuosity or viscosity}
- G01R 33/323: {Detection of MR without the use of RF or microwaves, e.g. force-detected MR, thermally detected MR, MR detection via electrical conductivity, optically detected MR}
- G01R 33/3415: comprising arrays of sub-coils {, i.e. phased-array coils with flexible receiver channels}
- G01R 33/445: {MR involving a non-standard magnetic field B0, e.g. of low magnitude as in the earth's magnetic field or in nanoTesla spectroscopy, comprising a polarizing magnetic field for pre-polarisation, B0 with a temporal variation of its magnitude or direction such as field cycling of B0 or rotation of the direction of B0, or spatially inhomogeneous B0 like in fringe-field MR or in stray-field imaging}
- G01R 33/3607: {RF waveform generators, e.g. frequency generators, amplitude-, frequency- or phase modulators or shifters, pulse programmers, digital to analog converters for the RF signal, means for filtering or attenuating of the RF signal}
- G01R 33/3614: {RF power amplifiers}
- G01R 33/3621: {NMR receivers or demodulators, e.g. preamplifiers, means for frequency modulation of the MR signal using a digital down converter, means for analog to digital conversion [ADC] or for filtering or processing of the MR signal such as bandpass filtering, resampling, decimation or interpolation}
- G01V: GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS (means for indicating the location of accidentally buried, e.g. snow-buried, persons A63B29/02)
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)

## Abstract

Provided are a surface nuclear magnetic resonance system excited by a geoelectric field and a field working method for groundwater detection. A computer is connected to a synchronization module via a transmitter. The transmitter is connected to a first electrode and a second electrode via a transmission line. Receiving coils are symmetrically arranged on two sides of the transmission line. Each of the receivers is mounted with two receiving coils. The computer is connected to a fourth receiver via a first receiver, a second receiver, a third receiver, a sixth receiver and a fifth receiver, and the synchronization module is connected to the first receiver, the second receiver, the third receiver, the fourth receiver, the fifth receiver and the sixth receiver.

## Claims

### Claim 1

A surface nuclear magnetic resonance system excited by a geoelectric field, comprising:
a transmitter;
receivers;
receiving coils;
a computer; and
a synchronization module, wherein
the receivers comprise a first receiver, a second receiver, a third receiver, a fourth receiver, a fifth receiver and a sixth receiver,
the computer is connected to the synchronization module via the transmitter,
the transmitter is connected to a first electrode and a second electrode via a transmission line,
the receiving coils are symmetrically arranged on two sides of the transmission line connecting the first electrode and the second electrode, each of the receivers is mounted with two of the receiving coils,
the computer is connected to the fourth receiver via the first receiver, the second receiver, the third receiver, the sixth receiver and the fifth receiver, and
the synchronization module is connected to the first receiver, the fourth receiver, the second receiver, the fifth receiver, the third receiver and the sixth receiver.

### Claim 2 (depends on 1)

The surface nuclear magnetic resonance system excited by the geoelectric field according to claim 1, wherein a spacing between the receiving coils is 80 m, and each of the receiving coils has a side length or a diameter of 100 m.

### Claim 3 (depends on 1)

The surface nuclear magnetic resonance system excited by the geoelectric field according to claim 1, wherein the transmitter comprises:
a main control circuit;
a storage battery;
a DC-DC charging module;
a high power capacitor bank;
an IGBT drive module;
a transmitting bridge;
a transmission line interface;
a synchronization signal interface; and
a communication interface; and wherein
the main control circuit is connected to the transmission line interface via the storage battery, the DC-DC charging module, the high power capacitor bank and the transmitting bridge,
the main control circuit is connected to the transmitting bridge via the IGBT drive module, and
the main control circuit is connected to the communication interface, the synchronization signal interface and the DC-DC charging module.

### Claim 4 (depends on 1)

The surface nuclear magnetic resonance system excited by the geoelectric field according to claim 1, wherein each of the receivers comprises:
a first receiving coil interface;
a first relay switching circuit;
a first bilateral diode;
a first amplifying and band-pass filtering circuit;
a control module;
an A/D sampling module;
a second receiving coil interface;
a second relay switching circuit;
a second bilateral diode;
a second amplifying and band-pass filtering circuit;
a synchronization signal interface;
a USB communication interface; and
an RS485 interface; and wherein
the first receiving coil interface is connected to the A/D sampling module via the first relay switching circuit, the first bilateral diode and the first amplifying and band-pass filtering circuit,
the synchronization signal interface is connected to the USB communication interface and the RS485 interface via the control module and the A/D sampling module,
the second receiving coil interface is connected to the A/D sampling module via the second relay switching circuit, the second bilateral diode, the second amplifying and band-pass filtering circuit, and
the first relay switching circuit is connected to the second relay switching circuit via the control module.

### Claim 5 (depends on 1)

A field detection method for the surface nuclear magnetic resonance system excited by the geoelectric field according to claim 1, comprising:
step a, selecting two points in a test region to fix a first electrode and a second electrode at the two points respectively, and connecting two ends of the transmission line to the first electrode and the second electrode respectively, wherein a distance L between the two points is 1000 m;
step b, laying the receiving coils, with each of the receiving coils having a side length or a diameter of 100 m, wherein a first receiving coil, a second receiving coil, . . . and a twelfth receiving coil are laid symmetrically on two sides of the transmission line, starting from the first electrode, and a spacing between the receiving coils is 80 m;
step c,
connecting the transmission line to the transmission line interface,
connecting the computer to a communication interface of the transmitter and a USB communication interface of the first receiver,
connecting an RS485 interface of the first receiver to an RS485 interface of the second receiver,
connecting the RS485 interface of the second receiver to an RS485 interface of the third receiver,
connecting the RS485 interface of the third receiver to an RS485 interface of the sixth receiver,
connecting the RS485 interface of the sixth receiver to an RS485 interface of the fifth receiver, and
connecting the RS485 interface of the fifth receiver to an RS485 interface of the fourth receiver;
step d,
connecting the first receiving coil and the second receiving coil to a first receiving coil interface and a second receiving coil interface of the first receiver respectively,
connecting a third receiving coil and a fourth receiving coil to a first receiving coil interface and a second receiving coil interface of the second receiver respectively,
connecting a fifth receiving coil and a sixth receiving coil to a first receiving coil interface and a second receiving coil interface of the third receiver respectively,
connecting a seventh receiving coil and an eighth receiving coil to a first receiving coil interface and a second receiving coil interface of the fourth receiver respectively,
connecting a ninth receiving coil and a tenth receiving coil to a first receiving coil interface and a second receiving coil interface of the fifth receiver respectively,
connecting an eleventh receiving coil and a twelfth receiving coil to a first receiving coil interface and a second receiving coil interface of the sixth receiver respectively; and
step e, setting a range of transmission pulse moments, the number of the transmission pulse moments, the number of times of superposition and an acquisition frequency with the computer, starting the surface nuclear magnetic resonance system to operate after the setting is completed, and storing detected data in a case that detection for the detection points is completed.