title: High-overtone self-focusing acoustic transducers for high-frequency ultrasonic Doppler.
abstract: 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.
authors.affiliation: School of Electronic Information, Wuhan University, Wuhan, Hubei 430079, PR China.
authors.forename: Jie
authors.initials: J
authors.lastname: Zhu
authors.forename: Chuangyuan
authors.initials: C
authors.lastname: Lee
authors.forename: Eun Sok
authors.initials: ES
authors.lastname: Kim
authors.forename: Dawei
authors.initials: D
authors.lastname: Wu
authors.forename: Changhong
authors.initials: C
authors.lastname: Hu
authors.forename: Qifa
authors.initials: Q
authors.lastname: Zhou
authors.forename: K Kirk
authors.initials: KK
authors.lastname: Shung
authors.forename: Gaofeng
authors.initials: G
authors.lastname: Wang
authors.forename: Hongyu
authors.initials: H
authors.lastname: Yu
mesh_terms: D000162:Acoustics; D004301:Doppler Effect; D014159:Transducers; D014465:Ultrasonics