| 摘要 |
PURPOSE:To make it possible to easily perform the discrimination of inner and outer positions of flaws in a pipe material, by providing X.Y/X<2> or X.Y/Y<2> operators with respect to the X- and Y-components of the signal from an XY display type eddy current flaw detector. CONSTITUTION:A pipe 3 to be subjected to flaw detection having an outer surface flaw 1 and an inner surface flaw 2 receives flaw detection by the scanning of the probe 5 connected to an eddy current flaw detector 4 and both flaws are displayed on a cathode ray tube 6. An inner and outer flaw display apparatus 9 is connected to the output terminal 7 of the flaw detector 4 to allow said flaw detector 4 to perform the operation of X.Y/X<2> and Y.X/X<2> with respect to both X- and Y-components of a signal and output Y.X/X<2> is inputted to the input terminal 10 of a pen recorder 8. By this method, the value of Y.X/X<2> to the signal 1A of the outer surface flaw 1 comes to a (-) signal in second and fourth quadrants and, therefore, pen-writing recording is rocked to a lower side as shown by a mark 1B. The signal 2A of the inner surface flaw 2 is present in the first and third quadrants on the cathode ray tube 6 and, therefore, the value of Y.X/X<2> is (+) and shaken to an upper side as shown by a mark 2B. |
