发明名称 |
METHOD AND APPARATUS FOR MEASURING THE POLARIZED POTENTIAL OF A BURIED OR SUBMERGED STRUCTURE PROTECTED BY IMPRESSED CURRENT |
摘要 |
<p>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 a 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.</p> |
申请公布号 |
CA1229382(A) |
申请公布日期 |
1987.11.17 |
申请号 |
CA19860505200 |
申请日期 |
1986.03.26 |
申请人 |
GAS RESEARCH INSTITUTE |
发明人 |
BIRCHMEIER, JOHN R.;RUCK, GEORGE T.;THOMPSON, NEIL G.;BARLO, THOMAS J. |
分类号 |
G01N27/00;(IPC1-7):G01N27/00 |
主分类号 |
G01N27/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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