| 摘要 |
<P>PROBLEM TO BE SOLVED: To measure corrosion rates of a corrosion of a steel in the air and a corrosion of a steel pipe. Ž<P>SOLUTION: When a change in an electrical resistance of an electrical resistor is measured, a current coded in M serial bits is input. The electrical resistance is obtained from a peak of a correlation waveform obtained by correlating an input with an output. The change in the electrical resistance is obtained from a difference between the electrical resistances measured at a differential time interval. A phase difference can be discriminated from a peak shape by using a reference resistor having the electrical resistance which does not change due to a factor other than a temperature and thermally compensating a measurement value of the electrical resistance. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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