Title :
Reflection coefficient measurement of anisotropic materials by ultrasonic micro-spectrometer
Author :
Nakaso, Noritaka ; Ohira, Katsumi ; Tsukahara, Yusuke
Author_Institution :
Toppan Printing Co. Ltd., Saitama, Japan
Abstract :
An ultrasonic micro-spectrometer (UMSM) was developed to measure the reflection coefficient of a solid specimen at a small spot on its surface. A prototype system operates in a frequency range from 20 to 150 MHz, and in an incident angle from 20° to 40°. The stability of the UMSM is experimentally evaluated. The leaky Rayleigh wave velocity is measured by observing the phase change of the reflection coefficient, and the stability of successive measurements on a single spot is less than ±0.08% of the average value. It is shown that the anisotropic reflection coefficient can be stably measured. The measurement is also attempted on a spot of the specimen surface as small as 220 μm in diameter
Keywords :
Rayleigh waves; calibration; phase measurement; stability; surface acoustic waves; ultrasonic equipment; ultrasonic measurement; ultrasonic reflection; ultrasonic velocity measurement; 20 to 150 MHz; 220 micron; anisotropic materials; anisotropic reflection coefficient; calibration; leaky Rayleigh wave velocity; phase change; single spot; solid specimen; stability; ultrasonic micro-spectrometer; ultrasonic reflection coefficient; Anisotropic magnetoresistance; Calibration; Frequency; Lenses; Optical materials; Reflection; Stability; Surface waves; Ultrasonic transducers; Ultrasonic variables measurement;
Conference_Titel :
Ultrasonics Symposium, 1991. Proceedings., IEEE 1991
Conference_Location :
Orlando, FL
DOI :
10.1109/ULTSYM.1991.234097
