| 摘要 |
PROBLEM TO BE SOLVED: To provide a quenching depth measuring instrument capable of measuring simply and precisely a quenching depth of a steel material, even a resistivity of a base material is unknown. SOLUTION: This quenching depth measuring instrument is provided with a pair of electrification electrode styluses for making a current flow between two optional points on a surface of the quenched steel material, at least three pairs of potential detecting styluses for detecting respectively potential differences between portions different each other, in a potential distribution generated in the steel material in accompaniment to electrification, and a computing means for calculating the quenching depth of the steel material, based on a characteristic expression expressing the potential distribution generated in the steel material, according to the potential differences detected by the respective potential detecting styluses, information (spacing of the styluses) of the portions with the detected potential difference, and a current flowing between the electrification electrode styluses. COPYRIGHT: (C)2007,JPO&INPIT
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