High-overtone self-focusing acoustic transducers for high-frequency ultrasonic Doppler.
This work reports the potential use of high-overtone self-focusing acoustic transducers for high-frequency ultrasonic Doppler. By using harmonic frequencies of a thick bulk Lead Zirconate Titanate (PZT) transducer with a novel air-reflector Fresnel lens, we obtained strong ultrasound signals at 60 MHz (3rd harmonic) and 100 MHz (5th harmonic). Both experimental and theoretical analysis has demonstrated that the transducers can be applied to Doppler systems with high frequencies up to 100 MHz.
Zhu
Jie
J
School of Electronic Information, Wuhan University, Wuhan, Hubei 430079, PR China.
Lee
Chuangyuan
C
Kim
Eun Sok
ES
Wu
Dawei
D
Hu
Changhong
C
Zhou
Qifa
Q
Shung
K Kirk
KK
Wang
Gaofeng
G
Yu
Hongyu
H
D000162:Acoustics; D004301:Doppler Effect; D014159:Transducers; D014465:Ultrasonics