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Ground measuring method of metal pipeline loading current underground

A technology of loading current and measurement method, which is applied in the direction of radio wave measurement system, geophysical measurement, measuring device, etc., can solve the problem that the loading current of underground metal pipelines has not been reported publicly, and achieve simple structure, convenient operation and accurate measurement Effect

Inactive Publication Date: 2006-08-16
NANJING TECH UNIV
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  • Application Information

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Problems solved by technology

[0004] There is no public report on the ground measurement method of the loading current of underground metal pipelines

Method used

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  • Ground measuring method of metal pipeline loading current underground
  • Ground measuring method of metal pipeline loading current underground
  • Ground measuring method of metal pipeline loading current underground

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Experimental program
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Embodiment Construction

[0041] A ground measurement method for the loading current of underground metal pipelines, specifically it is divided into:

[0042] Step 1. Use the transmitter to load an AC signal of a certain frequency on the underground pipeline;

[0043] Step 2, determine the position directly above the underground metal pipeline with the peak value method or the zero value method;

[0044] Step 3. Measure the magnetic field strength of the alternating magnetic field generated by the metal pipeline with the upper and lower coils at a certain distance on the ground directly above the underground metal pipeline, and convert it into a corresponding two-way AC voltage signal;

[0045] Step 4, the above-mentioned two AC voltage signals pass through the first and second preamplifiers QZFD1 and QZFD2 respectively, the first and second switched capacitor frequency selective amplifiers XPFD1 and XPFD2, the first and second detection circuits JBQ1 and JBQ2, the first , The second signal conditioni...

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Abstract

A ground measuring method of current loaded on underground metal pipeline includes loading AC signal with certain frequency on underground pipeline to confirm right-up position of said pipeline; measuring magnetic field intensity of said pipeline by top and bottom coils and converting it to be relevant two path AC voltage signal ;obtaining relevant DC voltage signal via preamplifier, switch capacity frequency-selective amplifier, rectifying circuit and signal nursing circuit; converting it to be digital amount ,sending the second digital amount to divider for obtaining quotient being sent to be the first multiplier ,the second multiplier ,third multiplier and a filter for obtaining current value loaded on said pipeline .

Description

technical field [0001] The invention relates to a ground measurement method for loading current of an underground metal pipeline, which belongs to the technical field of electronic measuring instruments. Background technique [0002] In the detection of underground metal pipelines, it is necessary to use a transmitter to load an AC signal on the underground metal pipelines, and an alternating magnetic field will be generated around the pipelines. The direction and buried depth of underground metal pipelines can be known by detecting the strength and phase of the magnetic field on the ground; The loaded current value is related to the voltage of the applied AC signal, the conductivity of the local soil, and the quality of the anti-corrosion layer of the underground metal pipeline; and the current value at different points on this pipeline may be different. In the process of the pipeline leaving the transmitter, the current will drop a little every time it passes through a dam...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/08
Inventor 孙世荣林锦国
Owner NANJING TECH UNIV