Title :
Some novel applications of point source and point detector for ultrasonic waves
Author :
Kim, Kwang Yul ; Sachse, Wolfgang
Author_Institution :
Dept. of Theor. & Appl. Mech., Cornell Univ., Ithaca, NY, USA
Abstract :
Some novel applications of the pointlike source and pointlike detector for ultrasonic waves in the investigation of various physical phenomena are described. The pointlike sources are generated by the fracture of a glass capillary, a focused laser beam and small lead zirconate titanate (PZT) transducers, while the pointlike detectors include small PZT and capacitive transducers. The topics discussed are observation of the focusing of the fast transverse (FT) mode in silicon; determination of wave or group velocity surfaces of zinc, which includes those of longitudinal (L), FT, and slow transverse (ST) waves, cuspidal features of the ST mode, and the head wave front; and observation of a phenomenon related to the external conical refraction in zinc, i.e., the focusing of the ST mode toward the symmetry axis
Keywords :
acoustic radiators; elemental semiconductors; focusing; laser beam applications; piezoelectric transducers; silicon; surface acoustic waves; ultrasonic propagation; ultrasonic refraction; ultrasonic transducers; zinc; PbZrO3TiO3; Sr; Zn; capacitive transducers; cuspidal features; elemental semiconductor; external conical refraction; fast transverse mode; focused laser beam; focusing; fracture; glass capillary; group velocity surfaces; head wave front; longitudinal waves; phonon focusing pattern; pointlike detector; pointlike source; slow transverse waves; small PZT transducers; ultrasonic waves; wave velocity surfaces; Detectors; Glass; Laser beams; Laser modes; Laser theory; Silicon; Surface waves; Titanium compounds; Ultrasonic transducers; Zinc;
Conference_Titel :
Ultrasonics Symposium, 1992. Proceedings., IEEE 1992
Conference_Location :
Tucson, AZ
Print_ISBN :
0-7803-0562-0
DOI :
10.1109/ULTSYM.1992.275826
