Title :
Directional point-focus-beam acoustic microscope system [for materials characterization]
Author :
Sannomiya, T. ; Kushibiki, J. ; Chubachi, N. ; Matsuno, K. ; Suganuma, R. ; Shinozaki, Y.
Author_Institution :
Dept. of Electr. Eng., Tohoku Univ., Sendai, Japan
Abstract :
A practical system of directional point-focus beam (PFB) acoustic microscopes with two functions of imaging and quantitative measurements is developed based on the authors´ previous work. The construction and performance of the system are described. The system is demonstrated for investigation of a polycrystalline sample of Mn-Zn ferrite with an average grain size of 100 μm using two directional PFB devices. Directional acoustic images are obtained at 225 MHz and 375 MHz in several different propagation directions of leaky surface acoustic waves (LSAWs). Measurements of LSAW velocity, including the angular dependence in some grains of the sample, are performed according to the procedure of V(z) curve analysis. Anisotropic elastic properties of each grain are characterized both in imaging and in quantitative measurements
Keywords :
acoustic microscopes; acoustic microscopy; ferrites; manganese compounds; surface acoustic waves; ultrasonic materials testing; ultrasonic velocity measurement; zinc compounds; 225 MHz; 375 MHz; Mn1- chi Znchi Fe2O4; acoustic microscopes; angular dependence; directional acoustic images; directional point-focus beam; ferrite sample; leaky surface acoustic waves; performance; polycrystalline sample; Acoustic beams; Acoustic devices; Acoustic imaging; Acoustic measurements; Acoustic propagation; Ferrites; Grain size; Microscopy; Structural beams; Surface acoustic waves;
Conference_Titel :
Ultrasonics Symposium, 1992. Proceedings., IEEE 1992
Conference_Location :
Tucson, AZ
Print_ISBN :
0-7803-0562-0
DOI :
10.1109/ULTSYM.1992.275905
