| 摘要 |
The invention provides a method and apparatus aimed at improving the range of situations to which field signature method based techniques are applicable from measuring corrosion. In particular, the invention is directed towards situations in which the location requiring investigation has been the subject of pre-existing corrosion. The invention provides a method of investigating corrosion at a location, the method including providing mounting unit for two or more electrical contacts, introducing the mounting unit to a replica of the location which has not corroded, measuring the voltage between the two or more electrical contacts at one or more times, the two or more electrical contacts being in contact with a replica of the location being investigated, introducing the mounting unit to the location which may have corroded, measuring the voltage between and/or the variation in the voltage between two or more electrical contacts at a first time and at one or more other times, the two or more electrical contacts being in contact with the location being investigated, passing a current through the replica location at the time of the voltage measurement and through the location at the time of the voltage measurements, the current being provided by a given source for the various voltage measurements, the voltage measurement for the replica location defining the characteristics for an uncorroded location, the voltage measurements for the location indicting the extent of corrosion which has occurred by the time of the first voltage measurement for the location and/or indicating the progress of corrosion between the first time and one or more of the other times of voltage measurement for the location.
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