Title :
Time-domain measurement of velocities and attenuation with low frequency acoustic microscope
Author :
Kawashima, Koichiro ; Fujii, Ikuya ; Takenouti, Naoki ; Ikeda, Yasushi
Author_Institution :
Nagoya Inst. of Technol., Japan
Abstract :
A low frequency acoustic microscope which is operated in 10-50 MHz has been developed for precise measurement of leaky surface wave velocities and attenuation of engineering materials. The PVDF transducers are combined with a digital signal acquisition system in time-domain. Various digital signal processing are applied for the digitized waveforms, from which leaky wave velocity dispersion, attenuation are extracted. The system has been applied for measurement of the Young modulus of coating film, mass density of surface and attenuation of the leaky Rayleigh wave
Keywords :
Rayleigh waves; acoustic microscopy; acoustic wave absorption; acoustic wave velocity measurement; 10 to 50 MHz; PVDF transducer; Rayleigh wave; Young modulus; coating film; digital signal acquisition system; digital signal processing; engineering material; leaky surface wave attenuation; leaky surface wave velocity; low frequency acoustic microscopy; mass density; time-domain measurement; ultrasonic spectroscopy; Acoustic materials; Acoustic measurements; Acoustic transducers; Acoustical engineering; Attenuation measurement; Frequency measurement; Microscopy; Surface acoustic waves; Time domain analysis; Velocity measurement;
Conference_Titel :
Ultrasonics Symposium, 1998. Proceedings., 1998 IEEE
Conference_Location :
Sendai
Print_ISBN :
0-7803-4095-7
DOI :
10.1109/ULTSYM.1998.765081
