| 摘要 |
PURPOSE:To make it possible to measure the thickness of a thin walled material or the flaw detection of said material, by discharging a first capacitor in such a state that a switching element was brought to a continuity state after the first capacitor was charged and outputting a high frequency pulse current to the secondary side of a saturable transformer by the series resonance due to a second capacitor and a transmitting-receiving coil. CONSTITUTION:The output current of a high voltage generation circuit 601 flows to the primary side of a saturable transformer 600 through a resistor 602, a coil 604 and a capacitor 605 to charge the capacitor 605. Thereafter, when a thyristor 603 is turned ON in certain timing, the charge, which was charged to the capacitor 605, is discharged as a current I1 and this current I1 comes to zero after several musec because of the discharge through the coil 604. At this time, the transformer 606 generates an output current I2 in the secondary side of the transformer 606 and a capacitor 607 is charged and, when the transformer 606 is saturated after the elapse of about 1musec, the inductance of secondary side winding comes to almost zero and a high frequency pulse current I2 is outputted to the secondary side of the transformer 606 by the series resonance due to the capacitor 607 and the transmitting-receiving coil 4. |
