| 摘要 |
PURPOSE:To perform the flaw detection of an object to be inspected having a complicated surface configuration and difficult to mechanically follow, by performing scanning in such a state that the distance between the surface of the object to be inspected and an ultrasonic probe is kept constant and the probe is allowed to coincide with the normal line direction of the surface of the object to be inspected. CONSTITUTION:A transmitter 22 repeatedly applies a pulse to an ultrasonic probe 12 while the probe 12 emits an ultrasonic wave to an object 10 to be inspected and receives the reflected wave therefrom. This receiving signal is sent to a distance detection circuit 26 through a receiver 24 and an up-and-down drive apparatus 28 is controlled by the detection output corresponding to the time from the transmission of the ultrasonic wave to the reception thereof to keep the distance between the probe 12 and the surface of the object 10 to be inspected. The reflected wave from the object 10 to be inspected is sent to an angle comparator 32 through receivers 20A, 20B and amplifiers 30A, 30B and the shift between the normal line direction of the object 10 to be inspected and the transmitting/receiving direction of the probe 12 is detected and an angle control apparatus 34 is driven by the detected output and, by this method, the normal line direction of the surface of the object 10 to be inspected is allowed to coincide with the ultrasonic wave transmitting/receiving direction of the probe 12 to perform automatic ultrasonic flaw detection.
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