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Method and apparatus for measuring the polarized potential of a buried or submerged structure protected by impressed current
Method and apparatus for measuring the polarized potential of a buried or submerged structure protected by impressed current
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机译:测量受外加电流保护的埋入式或浸入式结构的极化电势的方法和设备
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摘要
The polarized potential at the boundary between a submerged pipe and a medium is measured unaffected by the presence of a distributed IR drop in the medium due to an impressed current from a corrosion protection system. The voltage between the pipe and a reference electrode in the medium is measured when the protection system current is zero. This is accomplished with a sample-and-hold circuit controlled by a trigger signal derived from the input signal and having a variable phase for controlling the phase angle at which the sample is taken.
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