Method for detecting positions of underground metal pipelines by aid of space vector method and device

Abstract

The invention provides a method for detecting the positions of underground metal pipelines by the aid of a space vector method and a device. The method is characterized by comprising steps of 1) leading an underground metal pipeline to radiate magnetic field signals; 2) inducting the magnetic field signals radiated by the metal pipeline by the aid of two magnetic field sensor groups; 3) respectively carrying out signal conditioning for the magnetic field signals induced by the two magnetic field sensor groups; 4) realizing analog-to-digital conversion for the analog signals after conditioning; 5) obtaining laying information of the metal pipeline to be detected by means of inverting and computing digital signals; and 6) displaying a computation result on a man-machine interface. The device for implementing the method comprises the two magnetic field sensor groups, signal conditioning units, an analog-to-digital converter, a central processing unit and the man-machine interface, the two magnetic field sensor groups are spaced by a certain distance and are horizontally arrayed, an output end of each magnetic field sensor group is connected with the central processing unit via the corresponding signal conditioning unit and the analog-to-digital converter respectively, and the central processing unit is connected with the man-machine interface. By the aid of the method, the position, the depth and the trend of the metal pipeline can be indicated in real time, and precision is high.

Description

technical field [0001] The invention provides a method and a device for detecting the position of an underground metal pipeline using a space vector method, belonging to the technical field of metal pipeline detection. Background technique [0002] Metal pipelines or cables (the metal sheath and conductive core wire of the cable are equivalent to metal pipelines) are generally laid underground. When construction is required, such as cable cutover or fault repair, pipeline opening and maintenance, etc., it is necessary to To detect its laying position, when it is necessary to excavate a certain area, it is also necessary to detect the metal pipeline and cable under the ground in advance, and calibrate its position and depth to avoid damage during ground excavation. For the above problems, the existing technical solutions are: [0003] 1) The traditional metal pipeline detection technology generally sends an audio current signal of a certain frequency to the metal pipeline th...

AI Technical Summary

Problems solved by technology

The advantage of this method is that it is easy to operate. When the detection coil is directly above the metal pipeline, you can press the button to instruct the detector to automatically calculate the depth; the disadvantage is that this formula is only valid when the detection coil is directly above the metal pipeline, so it cannot be measured in real time. Deep; meet the requirements when the depth is small, and the error rises sharply with the increase of depth

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