Use of a sapphire fiber as a transmission line

Ultrasonic propagation in the sapphire fiber was analyzed using the Pochlamer-Chree theory as stated in L. Pochlamer (1876), and conversion method from the transducer to thin fiber, and that from the fiber to the water were simulated using PZFLEX. The experimental results for the dispersion curves for L(0,1) mode in the frequency range of 1-20 MHz coincided with the theoretical curve. The simulation results for the tapered transmission line used as a mechanical transducer show that the optimum shape is required in order to excite the L(0,1) mode is confined at the peripheral region, radiation mechanism of ultrasonic wave from the sapphire rod was considered as a radiation from the grating formed on the surface of the rod.