| 摘要 |
PURPOSE:To detect a directional defect and discriminate between a shape echo and a defect echo by providing a converter so that an ultrasonic wave is transmitted to and received from a part to be inspected simultaneously and also independently. CONSTITUTION:Transmitted pulses generated by a pulser 51 are supplied to one of converters 31-34 selectively by a multiplexer (MPX) 52 and sent as an ultrasonic wave to the part 43 to be inspected. One of echoes that the converters 31-34 receive from a defect, etc., is selected by the MPX 53 and amplified by a receiver 54 on a frequency selective basis. Then, a gate 55 selects only a signal of time when the signal from the part 43 to be inspected is expected to arrive with time. Then, a defective echo discriminating device 8 calculates the position of a reflection source for the echo from a beam route, amplitude data, data on a flaw detection direction, etc., and stores it together with the respective data to discriminate the defect and decide on its direction. Therefore, the defect is detected speedily and securely. |
