Study on wireless power transmission using convergent ultrasound beam

2015 Fiscal Year Final Research Report

• Project/Area Number: 15K12074
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Human interface and interaction
• Research Institution: The University of Tokyo
• Principal Investigator: Shinoda Hiroyuki 東京大学, 新領域創成科学研究科, 教授 (40226147)
• Project Period (FY): 2015-04-01 – 2016-03-31
• Keywords: ワイヤレス電力伝送 / ヒューマンインタフェース / 超音波 / インタラクション

Outline of Final Research Achievements

In this study, we examined the feasibility of wireless power transmission in the air using convergent ultrasound beam. Since the ultrasound is reflected at the human skin surface, stronger ultrasound energy density is available near a human skin than the case of electromagnetic wireless power transmission. In this study, we experimentally confirmed that a 1cm-diamenter ultrasound transducer facing to an ultrasound phased array of 38 cm by 30 cm phased array could receive 0.15-0.65W in a parallel plane 20cm apart from the phased array. Next we realized a system that enabled power transmission to a moving target by keeping the ultrasound focus on it. We clarified the feasibility and limitation of the power transmission in the current available technologies.

Free Research Field

ハプティクス、バーチャルリアリティ、計測工学