| 摘要 |
PROBLEM TO BE SOLVED: To obtain an inspection method in which the degradation state of a piping material can be diagnosed without relying on a visual inspection and a destructive inspection by a method wherein an ultrasonic signal is transmitted to the outer surface on the inner surface of the tube material and an ultrasonic signal which is reflected by a face on the opposite side is received. SOLUTION: An ultrasonic probe 2 is brought into contact with the outer face (a) of a piping material 1, an ultrasonic signal is transmitted, and an ultrasonic signal which is reflected by a face (a reflecting face) (b) on the opposite side is received. The ultrasonic signal which is transmitted from the ultrasonic probe 2 is stored by an ultrasonic-transmitted-received-signal processor 3, the received signal is displayed on an oscilloscope which is installed at the ultrasonic-transmitted-received-signal processor 3, and the time elapsed up to its reception from its transmission and the intensity of received waves are displayed. Then, on the basis of the time elapsed up to the reception from the transmission, on the basis of the intensity of the received waves and on the basis of its half-width, the degradation state of the piping material 1 or the existence of a stuck object can be judged. The frequency of the ultrasonic signal to be used is not limited especially, but 0.5 to 6 MHz is preferable considering the signal-to-noise ratio of reflected waves. |
