A new structure of touch-type corrosion sensor for extraction of rust pattern is presented. This sensor consists of three electrodes and three coils for recognition of touch pattern with rust part. Three impedance rates between the terminals are obtained, and the unbalance of these rates reveals when the electrodes touch rust part. Therefore the existence of iron rust in the place where the sensor touched is estimated. As the result, this sensor is found to be useful as a detecting device for recognition of initial rust state.
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