Abstract：Two ultrasonic velocity measuring methods were introduced, the principle and difference between the two methods were expatiated. Some examples of ultrasonic velocity measuring technology in material evaluation were given.
何方成, 宫兆斌. 超声波声速测量技术及其在材料评价中的应用[J]. 材料工程, 2003, 0(8): 33-34.
HE Fang-cheng, GONG Zhao-bin. Ultrasonic Velocity Measuring Technology and its Application in Materials Evaluation. Journal of Materials Engineering, 2003, 0(8): 33-34.
 Don J Roth, J Lynne.Commercial Implementation of NASA-Developed Ultrasonic Imaging Methods via Technology Transfer[J].Materials Evaluation,1996,(11):1305-1309.  Edward R Generazio, Don I Roth.Ultrasonic Imaging of Porosity Variations Produced during Sintering[J].Journal of the American Ceramic Society, 1989, 72:1282-1285.  L PICHE.Ultrasonic velocity measurement for the determination of density in polyethylene[J]. Polymer Engineering and Science,1984,24:1354-1358.  D J Roth. Eliminating the Effect of Plate Thickness Variation in Ultrasonic Images Using a Single Transducer Method[J]. SPIE,1996,2944:76-85.