Method and apparatus for detecting heterogeneous layer in metal
专利汇可以提供Method and apparatus for detecting heterogeneous layer in metal专利检索，专利查询，专利分析的服务。并且PURPOSE: To easily obtain the data of the heterogeneous layer in a metal in the depth direction thereof by comparing the peak value of the output voltage corresponding to the induced electromotive force from the eddy current generated in an object to be measured with reference voltages of a pularity of levels.
CONSTITUTION: A reference sensor 20 is arranged at a reference position where the heterogeneous layer of an object 10 to be measured is not present and the magnetic field based on the eddy current 16 due to an exciting coil 24 is detected. The voltage corresponding to the induced electromotive force due to said magnetic field is applied to a peek value detection circuit 40 to calculate peak values and the mean value of the peak values is equally divided into a plurality of values to calculate reference voltages which are, in turn, displayed on a display apparatus 50. Subsequently, a detection sensor 30 detects the magnetic field based on the eddy current 18 due to an exciting coil 34. This detection signal and the reference voltages of setting devices 62a - 62n to which the output of the circuit 40 is set are compared by comparators 60a, 60n. When the heterogeneous layer 12 is scanned by the sensor 30, the peak values lower and the presence thereof is known and, since the peak values become small corresponding to the depth of the layer 12, the depth direction thereof is obtained by knowing which is the levels of a plurality of reference values the peak values reach.
COPYRIGHT: (C)1992,JPO&Japio，下面是Method and apparatus for detecting heterogeneous layer in metal专利的具体信息内容。
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