Alternating current ground potential gradient voltage signal measuring device

Abstract

In an alternating current ground potential gradient voltage signal measuring device, the input end of an input voltage division circuit is connected with the output end of a measured signal, and the output end of the input voltage division circuit is sequentially communicated with a differential amplification circuit, a frequency mixing circuit, an analog-digital conversion circuit and a single chip microcomputer circuit; a gain adjusting circuit for realizing differential amplification and circuit gain of the two operational amplifiers is also arranged between the output end of the single chip microcomputer circuit and the input end of the differential amplification circuit; a waveform generator circuit is arranged between the output end of the single-chip microcomputer circuit and the input end of the frequency mixing circuit. The frequency mixing circuit receives signals from the waveform generator circuit at the same time, carries out frequency mixing processing in the signals, and outputs the signals after frequency mixing to the input end of the analog-digital conversion circuit. The analog-to-digital conversion circuit digitizes an input signal and outputs a digital signal to the single-chip microcomputer circuit. The single-chip microcomputer circuit can control the waveform generator circuit and the gain adjusting circuit.

Description

technical field [0001] The invention belongs to the technical field of electronic measurement, and specifically provides an AC ground potential gradient voltage signal measuring device and method, especially for measuring the AC ground potential gradient voltage signal in the cathodic protection parameters of buried steel pipelines. Background technique [0002] The alternating ground potential gradient (ACVG) voltage signal in the cathodic protection parameters of buried steel pipelines can reflect the corrosion status of pipelines to a certain extent, so its detection is an important means of safety maintenance and can prevent problems before they happen. By measuring the signal with precision instruments, it is possible to accurately find the exact location of the damaged point of the anti-corrosion layer outside the pipeline and conduct quantitative analysis on the corrosion state, so as to provide real and reliable basic data for the integrity management of the pipeline ...

AI Technical Summary

Problems solved by technology

[0013] In order to solve the technical problem that the existing technology cannot realize accurate and fast measurement of the AC ground potential gradient voltage signal, the present invention provides a measuring device for the AC ground potential gradient voltage signal

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