Calibration method under near-bit wireless short-transmission ground envrionment based on electric field theory

Patent metadata

Field	Value
Publication number	US-2018203157-A1
Application number	US-201715708951-A
Country	US
Kind code	A1
Filing date	Sep 19, 2017
Priority date	Jan 19, 2017
Publication date	Jul 19, 2018
Grant date	—

Abstract

A calibration method under a near-bit wireless short-transmission ground environment includes the following steps: placing an emitter and a receiver, which are connected across a screw, in a container containing a solution, connecting the emitter with the receiver through a copper wire to form a loop of an electric field signal, connecting the emitter with a transmitting circuit to achieve signal transmission, connecting the receiver with a receiving circuit to achieve signal reception, and calibrating an optimal transmitting power and a receiving gain by measuring an amplitude relationship between a transmitted signal and a received signal in a case where resistivity values of solutions are different.

First claim

1 . A method for calibrating a near-bit wireless short-transmission system having an emitter and a receiver, comprising:
placing the emitter and the receiver in a solution, wherein a resistivity value of the solution is adjustable; connecting the emitter with the receiver using a metal wire; and connecting the emitter to a transmitting circuit; connecting the receiver to a receiving circuit; transmitting a first signal from the emitter and receiving a second signal at the receiver; and calibrating a transmitting power of the first signal and a receiving gain of the second signal by correlating an amplitude relationship between the first signal and the second signal at a plurality of resistivity values of the solution, wherein the emitter and the receiver are immersed in the solution.

2 . The calibration method according to claim 1 , wherein the emitter comprises a transmitting positive pole and a transmitting negative pole separated by a first insulator, the receiver comprises a receiving positive pole and a receiving negative pole separated by a second insulator, and the metal wire connects the transmitting negative pole and the receiving negative pole,
wherein the transmitting positive pole and the transmitting negative pole are respectively connected to the transmitting circuit through a lead 1 and a lead 2; the receiving positive pole and the receiving negative pole are respectively connected to the receiving circuit through a lead 3 and a lead 4, and the receiving circuit measures a potential difference between the lead 3 and the lead 4 to achieve signal reception.

3 . The calibration method according to claim 2 , wherein a length of each of the leads 1 to 4 is less than 10 cm.

4 . The calibration method according to claim 1 , wherein a resistivity value of the solution is adjustable from 0.2 ohm-metre to 200 ohm-metre.

5 . The calibration method according to claim 1 , wherein the solution is in a container made of an insulating material, thereby preventing an electric field signal from propagating through a wall of the container.

6 . The calibration method according to claim 1 , wherein the metal wire is a copper wire.

7 . The calibration method according to claim 1 , wherein the solution is an aqueous sodium chloride solution, and the resistivity value of the solution is adjusted by changing a concentration of sodium chloride.

8 . The calibration method according to claim 1 , wherein a diameter of the metal wire is 1 cm or more.

9 . The calibration method according to claim 1 , wherein the container is made of PVC or glass.

Assignees

• Inst Geology & Geophysics Cas

Inventors

• Sun Yuntao
• Chen Wenxuan
• Zhang Wenxiu
• Yang Yongyou
• Di Qingyun
• Zheng Jian

Classifications

• E21B47/13 Primary

  by electromagnetic energy, e.g. radio frequency · CPC title

• G01R29/0821

  rooms and test sites therefor, e.g. anechoic chambers, open field sites or TEM cells (for testing antennas G01R29/105) · CPC title

• G01V13/00 Primary

  Manufacturing, calibrating, cleaning, or repairing instruments or devices covered by groups G01V1/00 – G01V11/00 · CPC title

• G01R29/105

  using anechoic chambers; Chambers or open field sites used therefor (test sites used for measuring on other objects than aerials G01R29/0828; wave absorbing devices H01Q17/00) · CPC title

• G01R29/0814

  Field measurements related to measuring influence on or from apparatus, components or humans (EMC, EMI and similar testing in general G01R31/001), e.g. in ESD, EMI, EMC, EMP testing, measuring radiation leakage; detecting presence of micro- or radiowave emitters; dosimetry; testing shielding; measurements related to lightning · CPC title