1Beck K H. Ultrasonic refraction angles for inspection throughout the total wall thickness of tubes and pipes [J].Materials Evaluation, 1993, 51 (5): 875-882. 被引量:1
2Toth T M, Ross B J. The involute search unit-a new concept in the ultrasonie inspection of pipe [J].Materials Evaluation, 1981, 39 (8) : 828 - 833. 被引量:1