| 摘要 |
"Method and apparatus for analyzing the state of protection against corrosion of a work under cathodic protection" The subject of the invention is the study of the changeover time of the voltage between an electrode (9) and a metal work (1) buried in the ground (3) and presumed to be protected against corrosion by an electric current. For this study, it is intended momentarily to interrupt the circulation of the protective current, to read the voltage between the work (1) and the electrode (9), to pass these readings to an analogue filter (11), to smooth these filtered signals by substituting them with values corresponding to a continuous and monotonic postulated function, and then, the said filtering operation having distorted the said signals, to mathematically reconstruct the change in the voltage signals between the work and electrode such as it would be without analogue filter. The invention applies to the study of the cathodic protection of gas pipes.
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