High-intensity aerial ultrasonic source with a stripe-mode vibrating plate for improving convergence capability

Ito, Youichi

doi:10.1250/ast.36.216

Cited by 16 publications

(12 citation statements)

References 16 publications

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“…On the other hand, the disadvantage of this sound source is that the directivity changes when the sound velocity changes by the temperature change. Next, another sound source is a vibrating plate type ultrasonic sound source using a reflector [9,10]. The advantage of this sound source is that the directivity can be adjusted by adjusting the reflector when the sound velocity changes by the temperature change.…”

Section: Introductionmentioning

confidence: 99%

Development of an aerial ultrasonic sound source with a truncated cone-shaped reflective plate on a circular transverse vibrating plate

Uchiyama

Asami

Miura

2022

Acoust. Sci. & Tech.

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Ultrasound technology that delivers a powerful sound wave with sharp directivity over a long distance in the air is required. As a sound source for this purpose, authors devised an ultrasonic sound source with a new shape in which the opening area is smaller than that of the complex reflective plate, and a reflective plate whose size is equivalent to the area of the vibrating plate was mounted to it. This reflective plate is composed of a planar reflective plate and a truncated cone-shaped reflective plate. In this study, first, the directional characteristics of a circular transverse vibrating plate-type aerial ultrasonic sound source with an integrated rigid wall structure were examined. Next, the planar reflective plate and truncated cone-shaped reflective plate were analyzed to refine the design. Furthermore, a sound source equipped with these reflective plates was fabricated, and various acoustic characteristics were investigated. As the results, when the input power of the sound source was 30 W, the sound pressure was 293 Pa at the distance of 2 m. This is a unidirectional sound wave with a very intense sound pressure.

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Section: Introductionmentioning

confidence: 99%

Development of an aerial ultrasonic sound source with a truncated cone-shaped reflective plate on a circular transverse vibrating plate

Uchiyama

Asami

Miura

2022

Acoust. Sci. & Tech.

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“…Some studies have developed sound wave modulators which shift phase of reflected waves with reflective cells having different heights. 27,28) To shift phase of the sound waves produced by a stripe-mode rectangular vibrating plate, Ito 29) has used the difference of the height of a reflector; the reflector has caused the sound waves in antiphase to converge into one point.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of convergence efficiency for airborne ultrasonic self-bending beam with phase-modulating reflector

Yamamoto

Nomura

2022

Jpn. J. Appl. Phys.

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Acoustic self-bending beams for airborne ultrasound are highly expected to expand the capabilities of existing acoustic applications. Our previous study has implemented amplitude control based on the Airy function to achieve an ultrasonic self-bending beam in air. However, the amplitude control lacks sound pressure convergence into the main lobe. To improve the convergence, we propose using a reflector to achieve phase modulation. In this study, we used the Airy function and developed the reflector that incorporates different heights to control spatial phase distribution. Using the proposed reflector demonstrated a self-bending beam for an airborne ultrasound experimentally. In addition, compared to the amplitude modulation, the phase modulation using the proposed reflector improved convergence efficiency of sound pressure level by more than 6 dB at distances of 0.7 m and 1.0 m from the emitter.

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“…There are also rectangular, [19][20][21][22][23][24] square, 25,26) and circular transverse vibrating plate sources 27,28) that can emit high sound pressure sound waves into the air. These use transverse vibrations to generate large vibration displacements in vibrating plates.…”

Section: Introductionmentioning

confidence: 99%

High-intensity aerial ultrasonic source with sharp directivity containing a compact circular vibrating plate

Monzen

Masuda

Asami

et al. 2021

Jpn. J. Appl. Phys.

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An intense aerial ultrasonic source containing a compact circular vibrating plate with a uniform rod-type partially grooved source that can produce large displacement in part of the piston vibration and emit intense sound waves in a direction perpendicular to the vibration surface is investigated. Two different compact circular vibrating plates of intense aerial ultrasonic sources (square grooves and round grooves) are designed by considering the stress generated in ultrasonic sources and the sound pressure of the radiated sound waves. The vibration displacement distribution, the directivity of the emitted sound waves, and the input/output characteristics in designed ultrasonic sources are discussed. It was found that the sound waves can be emitted farther away perpendicular to the vibration surface at a very high sound pressure compared with traditional sources.

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High-intensity aerial ultrasonic source with a stripe-mode vibrating plate for improving convergence capability

Cited by 16 publications

References 16 publications

Development of an aerial ultrasonic sound source with a truncated cone-shaped reflective plate on a circular transverse vibrating plate

Development of an aerial ultrasonic sound source with a truncated cone-shaped reflective plate on a circular transverse vibrating plate

Enhancement of convergence efficiency for airborne ultrasonic self-bending beam with phase-modulating reflector

High-intensity aerial ultrasonic source with sharp directivity containing a compact circular vibrating plate

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