Title :
An ultrasonic transducer for second imaging using a LiNbO/sub 3/ plate with a local ferroelectric inversion layer
Author :
Nakamura, Kiyoshi ; Fukazawa, Kentaro ; Yamada, Ken ; Saito, Shigemi
Author_Institution :
Dept. of Electr. & Commun. Eng., Tohoku Univ., Japan
fDate :
3/1/2006 12:00:00 AM
Abstract :
A new lithium niobate (LiNbO/sub 3/) transducer of separated transmitter-receiver configuration is proposed for application to second harmonic imaging in a high-frequency range. In this transducer, a domain-inverted layer of half the plate thickness is formed selectively by Ti-diffusion and heat treatment in the central part of a LiNbO/sub 3/ plate. The uniformly polarized surrounding region is used as the transmitter that will generate the fundamental wave component. A transducer with the transmission frequency of 50 MHz and the reception frequency of 100 MHz is fabricated using a 36/spl deg/ rotated Y-cut LiNbO/sub 3/ plate, and its performance is demonstrated.
Keywords :
diffusion; ferroelectric materials; heat treatment; lithium compounds; plates (structures); titanium; ultrasonic imaging; ultrasonic transducers; 100 MHz; 50 MHz; LiNbO/sub 3/; Ti; domain-inverted layer; heat treatment; local ferroelectric inversion layer; plate thickness; reception frequency; second harmonic imaging; separated transmitter-receiver configuration; ultrasonic transducer; Acoustic imaging; Ferroelectric materials; Frequency; Heat treatment; Lithium niobate; Piezoelectric transducers; Polarization; Temperature; Ultrasonic imaging; Ultrasonic transducers;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
DOI :
10.1109/TUFFC.2006.1610575
