Linearly Convergent Aerial Ultrasonic Source Providing a Variable Incident Angle and Acoustic Radiation Force by Standing-Wave Ultrasonic Field

Ito, Youichi

doi:10.1143/jjap.48.07gm11

Cited by 11 publications

(12 citation statements)

References 9 publications

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“…In the proposed method, ultrasound waves emitted from an AUTD are reflected and focused using a concave reflector. A technique of reflecting ultrasound waves in order to focus them, has been applied in other studies [7,8]. The technique has also been applied in a previous study in haptics [11], through which the phased array can present a tactile stimulus at an arbitrary position within the workspace, but a focus-formable distance has not been extended owing to the planar reflections.…”

Section: Introductionmentioning

confidence: 99%

Midair Haptic Presentation Using Concave Reflector

Ariga

Fujiwara

Makino

et al. 2020

Lecture Notes in Computer Science

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An airborne ultrasound tactile display (AUTD) can focus on an arbitrary position by controlling the phase shift and amplitude of each transducer, and provide a tactile stimulus on the human body without direct contact. However, beyond a distance from the phased array, it cannot secure a focal size comparable to the wavelength and the displayed pressure pattern blurs. In this study, we propose a method with a concave reflector to focus at a farther position and present a tactile sensation without enlarging the array. By appropriately designing the focal length of the concave reflector, the focal point can be formed at a distant position using a mirror formula while keeping the focus size non-extended. We conducted two experiments, the results of which show that the proposed method is valid and that a workspace of several square centimeters can be achieved.

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Section: Introductionmentioning

confidence: 99%

Midair Haptic Presentation Using Concave Reflector

Ariga

Fujiwara

Makino

et al. 2020

Lecture Notes in Computer Science

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“…We have been developing a variety of technologies using high-intensity aerial ultrasonic waves. This technology has the significant advantage that it can be used in a noncontact manner [7][8][9][10]. High-intensity aerial ultrasonic waves may be applied in the atomization and removal of a liquid.…”

Section: Introductionmentioning

confidence: 99%

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

Ito

2015

Acoust. Sci. & Tech.

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The generation of high-intensity aerial ultrasonic waves is achieved by focusing the acoustic waves radiated from a vibration plate into a point. We developed a new point-converging source of high-intensity aerial ultrasonic waves that comprises a striped-mode rectangular vibrating plate to radiate an aerial ultrasonic wave with high efficiency and paraboloid reflectors. The roughness corresponds to the stripe interval arranged on the surface of the paraboloid reflector. The roughness difference depends on the wavelength of the sound wave. The new convergence method that we propose can converge all ultrasonic waves radiated by the vibrating plate. In addition, the reflectors used to converge the radiated ultrasonic waves are characterized by a much simpler construction than the conventional reflectors. The ultrasonic source fabricated on an experimental basis produced the maximum ultrasonic pressure of about 15,000 Pa (178 dB) at the supplied electric power of 50 W.

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“…[13][14][15] We have been developing a variety of technologies using high-intensity aerial ultrasonic waves. [16][17][18][19][20][21][22][23][24][25] One of the technologies to which a high-intensity aerial ultrasonic wave may be applied is the atomization and removal of liquid. This technology has significant features; therefore, it can be used in a noncontact way.…”

Section: Introductionmentioning

confidence: 99%

Examinations of Behavior of Liquid Irradiated with High-Intensity Aerial Ultrasonic Waves in a Long Pore

Ito

Kato

Osumi

2013

Jpn. J. Appl. Phys.

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We experimentally verified the method of using the radiation force of high-intensity aerial ultrasonic waves at a frequency of 20 kHz to remove a liquid that entered a long pore. It was found that, on the wall surface of a cavity formed in the pore after the liquid had been removed by irradiating with ultrasonic waves, a small number of residual liquid drops linearly accumulated at multiple positions along the internal circumference of the cavity wall. The positions irregularly changed as the removal progressed. It can be considered that this phenomenon was mainly caused by the acoustic radiation force produced by nonlinear aerial ultrasonic waves. To explain this phenomenon, we observed in detail the behavior of the liquid; in addition, we performed a simulation of the acoustic radiation force produced by nonlinear aerial ultrasonic waves in a long pore, and compared the results of the simulation with the observed behavior of the liquid.

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Linearly Convergent Aerial Ultrasonic Source Providing a Variable Incident Angle and Acoustic Radiation Force by Standing-Wave Ultrasonic Field

Cited by 11 publications

References 9 publications

Midair Haptic Presentation Using Concave Reflector

Midair Haptic Presentation Using Concave Reflector

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

Examinations of Behavior of Liquid Irradiated with High-Intensity Aerial Ultrasonic Waves in a Long Pore

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