Measurement of Acoustic Basic Parameters of Polyethylene Pipe

The acoustic characteristics testing, research and analysis on steel reinforced polyethylene composite pipes is conducted in this paper to provide strong basis for design of suitable phased array ultrasonic probe. The acoustic characteristic parameters are tested first, and the sound velocity is measured through twice reflected echo from the bottom surface. At the same time, the variation of the longitudinal wave velocity of the PE100 material under different temperature conditions is measured. The values of critical angle and acoustic impedance of the PE100 material are calculated by measuring the sound velocity. Then, the attenuation coefficient of the probes with different frequencies in the PE100 material is measured by the simulation calculation method and the actual measurement method, and the measurement attenuation coefficient of each frequency is further calculated. The results show that: (1) the sound velocity of PE100 material is 2,340m/s and the attenuation coefficient is 0.3dB/mm; (2) phased array ultrasonic inspection method can be used to make vertical incidence of longitudinal wave and avoid non-existence of the second critical angle; (3) 2MHz is the best frequency to inspect the body of steel reinforced polyethylene (PE) pipe. (paper)