Title :
Ultrasonic micromanipulation of small particles in liquid using VHF-range leaky wave transducers
Author :
Takeuchi, M. ; Abe, H. ; Yamanouchi, K.
fDate :
Oct. 31 1994-Nov. 3 1994
Abstract :
New ultrasonic micromanipulation techniques for small particles based on the radiation forces of high-frequency ultrasound are proposed, using VHF-range leaky wave transducers. A newly developed leaky wave transducer with beamwidth compression consists of a floating-electrode-type unidirectional interdigital transducer and a LiNbO3 substrate. It has many advantages: no impedance matching scheme between liquid and substrate, efficient generation of higher-frequency ultrasonic waves into a small-scale liquid system, and isolation of interdigital electrodes from liquid. The experimental leaky wave transducer with narrow beam width of 120-μm shows a conversion loss of 5.8 dB at 97.5 MHz. Transportation and trapping of 50-μm-diameter glass spheres in water are confined by preliminary experiments in the frequency range of 50 to 100 MHz
Keywords :
VHF devices; acoustic applications; interdigital transducers; radiation pressure; ultrasonic applications; ultrasonic effects; ultrasonic transducers; 5.8 dB; 50 micron; 50 to 100 MHz; 97.5 MHz; LiNbO3; LiNbO3 substrate; VHF-range leaky wave transducers; beamwidth compression; conversion loss; floating-electrode-type unidirectional interdigital transducer; glass spheres; high-frequency ultrasound; liquid; radiation forces; small particles; transportation; trapping; ultrasonic micromanipulation; Acoustic applications; Acoustic radiation effects; Interdigital transducers; Leaky waves; VHF devices;
Conference_Titel :
Ultrasonics Symposium, 1994. Proceedings., 1994 IEEE
Conference_Location :
Cannes, France
Print_ISBN :
0-7803-2012-3
DOI :
10.1109/ULTSYM.1994.401660
