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High-overtone self-focusing acoustic transducers for high-frequency ultrasonic Doppler |
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| Authors: | Jie Zhu Chuangyuan Lee Dawei Wu Qifa Zhou Gaofeng Wang |
| Institution: | a School of Electronic Information, Wuhan University, Wuhan, Hubei 430079, PR China b School of Electrical, Computer and Energy Engineering, Arizona State University, AZ 85287, USA c Touchdown Technologies, Baldwin Park, CA 91706, USA d Department of Electrical Engineering, University of Southern California, CA 90089, USA e Department of Biomedical Engineering, University of Southern California, CA 90089, USA f School of Earth and Space Exploration, Arizona State University, AZ 85287, USA |
| 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. |
| Keywords: | Acoustic transducer Self-focusing Air-reflector Doppler |
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