Development of the key circuit of the corrosion monitoring system based on the field signature method

Inhalt:
The field fingerprint method is a new type of pipeline corrosion on-line monitoring method, which can realize long-term monitoring of pipelines in all directions. However, the existing equipment is mainly developed by foreign manufacturers based on DC excitation sources. The current is generally tens of amperes or even hundreds of amperes, and the cables are prone to heat. The corrosion monitoring system developed in this paper based on the field fingerprint method uses an embedded industrial control motherboard as the core, which can run the operating system, realizes the intelligentization of the equipment and has strong scalability in function; the AC excitation based on the digital output of the single-chip microcomputer is carefully designed. The current source avoids the influence of DC excitation; the adopted amplifying circuit has low noise and high common-mode rejection ratio, which can effectively extract the sampled signal. The data shows that the various parameters of this equipment are stable, and the operation is stable, which meets the requirements of on-site use.