UltraPower: Powering Tangible &amp; Wearable Devices with Focused Ultrasound

González, Rafael Morales; Marzo, Asier; Freeman, Euan; Frier, William; Georgiou, Orestis

doi:10.1145/3430524.3440620

Cited by 11 publications

(6 citation statements)

References 83 publications

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“…This feels like a surface when the palm moves across it. The circle was in a fixed position 12 cm above the centre of the device, where feedback is strong [14,34]. We created audible sound effects from the ultrasound device by creating a separate, fixed-position focal point away from the circle pattern, whose amplitude was modulated at audible frequencies.…”

Section: Methodsmentioning

confidence: 99%

“…We note that creating a secondary focal point for audio may affect the haptic output strength, since sound pressure will be distributed amongst both haptic and auditory points. Since the time-averaged sound pressure is limited for safety, peak output pressure may be below the maximum output pressure (approx 3000 Pa [34]), so the difference in haptic intensity is less than would be expected.…”

Section: Methodsmentioning

confidence: 99%

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Enhancing Ultrasound Haptics with Parametric Audio Effects

Freeman

2021

Proceedings of the 2021 International Conference on Multimodal Interaction

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Ultrasound haptic devices can create parametric audio as well as contactless haptic feedback. We investigate if multimodal output from these devices can influence the perception of haptic feedback. We used a magnitude estimation experiment to evaluate perceived roughness of an ultrasound haptic pattern. We found that white noise audio from the haptics device increased perceived roughness and pure tones did not, and that lower rendering frequencies may increase perceived roughness. Our results show that multimodal output has the potential to expand the range of sensations that can be presented by an ultrasound haptic device, paving the way to richer mid-air haptic interfaces. CCS CONCEPTS• Human-centered computing → Haptic devices; Sound-based input / output; Auditory feedback.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Enhancing Ultrasound Haptics with Parametric Audio Effects

Freeman

2021

Proceedings of the 2021 International Conference on Multimodal Interaction

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“…The use of ultrasound as an energy source has also been investigated [34], [35], [36]. González et al developed a remote power supply system by focusing airborne ultrasound on an ultrasound receiver, which performed an acoustic-electrical energy conversion [36].…”

Section: B Combination Of Airborne Focused Ultrasound and Physical Ob...mentioning

confidence: 99%

UltLever: Ultrasound-Driven Passive Haptic Actuator Based on Amplifying Radiation Force Using a Simple Lever Mechanism

Morisaki,

Kamigaki,

Fujiwara

et al. 2024

IEEE Trans. Haptics

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A lightweight haptic display that does not interfere with the user's natural movement is required for an immersive haptic experience. This study proposes a lightweight, powerful, and responsive passive haptic actuator driven by airborne focused ultrasound. This 6.2 g completely plastic passive device amplifies an applied ultrasound radiation force by a factor of 35 using a simple lever mechanism, presenting an amplified force of 0.7 N to the user's finger pad. 2-30 Hz vibration can also be presented. Since the radiation force is presented at the speed of sound, the amplified force is presented at high speed even with the high amplification rate of a lever, achieving such strong force and vibration presentation. Physical measurements showed that the amplified force was 0.7 N for the 20.48 mN input radiation force, and the amplitude of the presented vibration was over 0.1 N at 2-30 Hz. A psychophysical experiment showed that the vibration and force were perceivable with a device output level of -7.7 dB. In the future, we will explore methodologies around device design to present desired tactile sensations.

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“…Modulating the focus (or foci) in time and/or space and at the right frequency causes perceptible vibrations on the skin, which has since then been termed as mid-air haptics [8], [17]; a technology commercialised by Ultrahaptics (now Ultraleap) since 2014. Applications of mid-air haptics include automotive human machine interfaces [11], wireless power transfer [18], digital signage [12], augmented, virtual, and mixed reality (AR/VR/MR) [19]- [21]. A comprehensive review article was recently published on this topic [10].…”

Section: Related Work a Ultrasonic Haptic Devicesmentioning

confidence: 99%

UltraButton: A Minimalist Touchless Multimodal Haptic Button

Morales

Pittera

Georgiou

et al. 2022

IEEE Trans. Haptics

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We present UltraButton a minimalist touchless button including haptic, audio and visual feedback costing only $200. While current mid-air haptic devices can be too bulky and expensive (around $2k) to be integrated into simple mid-air interfaces such as point and select, we show how a clever arrangement of 83 ultrasound transducers and a new modulation algorithm can produce compelling mid-air haptic feedback and parametric audio at a minimal cost. To validate our prototype, we compared its haptic output to a commercially-available mid-air haptic device through force balance measurements and user perceived strength ratings and found no significant differences. With the addition of 20 RGB LEDs, a proximity sensor and other off-theshelf electronics, we then propose a complete solution for a simple multimodal touchless button interface. We tested this interface in a second experiment that investigated user gestures and their dependence on system parameters such as the haptic and visual activation times and heights above the device. Finally, we discuss new interactions and applications scenarios for UltraButtons.

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UltraPower: Powering Tangible & Wearable Devices with Focused Ultrasound

Abstract: Figure 1: UltraPower uses focused ultrasound to wirelessly transfer power to components in tangible and wearable devices (a): e.g., lights in a tabletop tangible object (b), loudspeakers on a physical object (c), and vibration motors in wearable devices (d).

Cited by 11 publications

References 83 publications

Enhancing Ultrasound Haptics with Parametric Audio Effects

Enhancing Ultrasound Haptics with Parametric Audio Effects

UltLever: Ultrasound-Driven Passive Haptic Actuator Based on Amplifying Radiation Force Using a Simple Lever Mechanism

UltraButton: A Minimalist Touchless Multimodal Haptic Button

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