S&M Young Researcher Paper Award 2020
Recipients: Ding Jiao, Zao Ni, Jiachou Wang, and Xinxin Li [Winner's comments]
Paper: High Fill Factor Array of Piezoelectric Micromachined
Ultrasonic Transducers with Large Quality Factor

S&M Young Researcher Paper Award 2021
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Notice of retraction
Vol. 32, No. 8(2), S&M2292

Print: ISSN 0914-4935
Online: ISSN 2435-0869
Sensors and Materials
is an international peer-reviewed open access journal to provide a forum for researchers working in multidisciplinary fields of sensing technology.
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Manipulation of Powder with Surface Acoustic Wave Actuator to Control Standing and Traveling Modes [PDF]

Yukako Takizawa, Yusuke Fukuchi, Kazuya Hamaguchi, Satoshi Amaya, Yuichi Utsumi, Masahiro Takeo, Kenji Iimura, Michitaka Suzuki, and Tsunemasa Saiki

(Received June 29, 2021; Accepted September 6, 2021)

Keywords: surface acoustic wave (SAW), standing wave, traveling wave, vibration proofing, powder transportation

In this study, we fabricated a new surface acoustic wave (SAW) actuator that can control the SAW mode of a powder-manipulation area between an interdigital transducer (IDT) (for generating the SAW) and an elastic-sheet (chloroprene rubber) pressurizer. In particular, the propagation surface near the ends of the substrate, at which the SAW is reflected, is pressurized with elastic bodies to suppress the reflected wave. We used laser Doppler vibrometry with the fabricated SAW actuator to investigate the change in SAW mode from standing to traveling due to elastic-sheet pressurization. The results of the investigation revealed two key points: (i) the amplitude of the reflected wave could be suppressed by about 90% by elastic-sheet pressurization and (ii) the SAW could be switched between the standing, traveling, and intermediate modes. We then investigated the behavior of a powder (100-μm-diameter SiO2) using the SAW actuator. We found that the powder could be dissipated by the SAW in the standing mode and then transported to the IDT side by utilizing the SAW in the traveling mode. It was also shown that a SAW in the intermediate mode between the standing and traveling modes (namely, the amplitude of the reflected wave is about one-third that of the incident wave) can be used to transport the powder to the IDT side while dissipating it.

Corresponding author: Tsunemasa Saiki

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