Underground cable locating method and device based on vector magnetic field detection

An underground cable and vector magnetic field technology, applied in the field of electromagnetic detection, can solve problems such as complex operation, power loss, and cumbersome design, and achieve the effects of strong operability, improved sensitivity and accuracy, and reduced weight and design difficulty

Active Publication Date: 2014-06-04
北京鼎臣世纪超导科技有限公司
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Problems solved by technology

But its disadvantage is that it cannot locate multiple cables at the same time under the measurement conditions of seven coil groups
[0006] In summary, the existing cable detection devices generally have problems such as power loss, complicated operation, and cumbersome design.

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  • Underground cable locating method and device based on vector magnetic field detection
  • Underground cable locating method and device based on vector magnetic field detection
  • Underground cable locating method and device based on vector magnetic field detection

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0028] The present invention is based on the underground cable location method of vector magnetic field detection, realizes by following steps:

[0029] Step 1: Select a measurement point arbitrarily within the range of the magnetic field generated by the AC cable, and establish a space rectangular coordinate system O with point a as the origin a (x a ,y a ,z a ), as the base coordinate system. Measure the voltage signal of the measurement point a by a three-axis magnetometer, and then deduce the formula of Faraday's law of electromagnetic induction to obtain the three directions x at the measurement point a a 、y a ,z a The magnetic induction intensity B ax , B ay , B az ;

[0030] Step 2: According to the nature of the magnetic field generated by the energized wire, use the two-point sampling algorithm to perform the following steps on the me...

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Abstract

The invention discloses an underground cable locating method and device based on vector magnetic field detection. Voltage signals of any two points in a magnetic field range generated by an alternating current cable through a three-axis magnetometer are input to a computer after being amplified through a lock-in amplifier, the magnetic induction intensity in three directions of the two measuring points is obtained through the computer, the magnetic-field vectors of the two measuring points are obtained soon after, then planes perpendicular to the magnetic induction intensity of the measuring points are made by crossing the two measuring points to obtain two plane equations, and finally the two plane equations are connected in a simultaneous mode to obtain a linear equation, namely, the position where the alternating current located. According to the underground cable locating method and device based on the vector magnetic field detection, the electromagnetic induction principle is utilized to achieve the operation of converting magnetic information into electric information, the problem of carrying out location on the cable fast is solved by data sampling and calculating, and the flexibility and accuracy of location are improved by utilizing amplified signals and the technology of smoothing and denoising. The device is passive, simple, fast and strong in maneuverability.

Description

technical field [0001] The invention belongs to the field of electromagnetic detection, specifically, an underground cable positioning method based on vector magnetic field detection, which can be applied and extended in the fields of marine engineering, optical cable detection, magnetic track navigation and the like. Background technique [0002] There are many cable positioning projects abroad. The document "Detection and location of underground cables using magnetic field measurements", Goddard, K.F., Wang, P., Lewin, P.L. and Swingler, S.G., 2012.4 records a measurement system for establishing a numerical model, using a set of detection coils to Measure the distribution of the power frequency magnetic field. By comparing and adjusting the parameters of the model, the total mean square error is minimized by the method of least squares. Estimates of the noise level show that the resolution of the system for measuring 50HZ power frequency magnetic fields is better than 1n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/11
Inventor 王三胜费捷张明吉
Owner 北京鼎臣世纪超导科技有限公司
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