TY - JOUR

T1 - Multi-frequency excitation of Rayleigh waves using an elliptical reflector focusing structure and its application for measurement of the acoustic properties of liquids

AU - Yamada, Kyohei

AU - Ieiri, Shoki

AU - Itoh, Shinsuke

AU - Kasashima, Takashi

AU - Imashiro, Chikahiro

AU - Twiefel, Jens

AU - Morita, Takeshi

N1 - Publisher Copyright: © 2025 The Japan Society of Applied Physics. All rights, including for text and data mining, AI training, and similar technologies, are reserved.

PY - 2025/2

Y1 - 2025/2

N2 - This study describes multi-frequency Rayleigh wave excitation below 10 MHz, which is impossible with a conventional piezoelectric-single-crystal surface acoustic wave (SAW) device. To overcome this limitation, we utilized a SAW device with an elliptical reflector focusing structure (ELIPS). The prototype ELIPS SAW device excited a Rayleigh wave on a duralumin surface at 1.1 MHz, 3.4 MHz, 5.6 MHz, and 7.9 MHz in the single device. The maximum vibration velocities were 0.38 m s−1, 0.21 m s−1, 0.070 m s−1, and 0.034 m s−1, respectively, which suggests the possibility of high-power mechatronics applications. To demonstrate the usefulness of the multi-frequency SAW below 10 MHz in a single device, we measured the frequency dependence of leaky SAW attenuation with a liquid droplet. The result showed that the acoustic properties of the liquid could be successfully estimated.

AB - This study describes multi-frequency Rayleigh wave excitation below 10 MHz, which is impossible with a conventional piezoelectric-single-crystal surface acoustic wave (SAW) device. To overcome this limitation, we utilized a SAW device with an elliptical reflector focusing structure (ELIPS). The prototype ELIPS SAW device excited a Rayleigh wave on a duralumin surface at 1.1 MHz, 3.4 MHz, 5.6 MHz, and 7.9 MHz in the single device. The maximum vibration velocities were 0.38 m s−1, 0.21 m s−1, 0.070 m s−1, and 0.034 m s−1, respectively, which suggests the possibility of high-power mechatronics applications. To demonstrate the usefulness of the multi-frequency SAW below 10 MHz in a single device, we measured the frequency dependence of leaky SAW attenuation with a liquid droplet. The result showed that the acoustic properties of the liquid could be successfully estimated.

KW - acoustic property

KW - ELIPS

KW - leaky SAW

KW - Rayleigh wave

KW - SAW device

KW - sensor

UR - http://www.scopus.com/inward/record.url?scp=85217252923&partnerID=8YFLogxK

U2 - 10.35848/1347-4065/adacf0

DO - 10.35848/1347-4065/adacf0

M3 - Article

AN - SCOPUS:85217252923

VL - 64

JO - Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers

JF - Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers

SN - 0021-4922

IS - 2

M1 - 02SP16

ER -