
Finnish researchers are advancing wireless power transmission using ultrasonic waves, lasers, and radio frequencies, paving the way for applications in industry, homes, and sensor networks.
The project is led by researchers from the Universities of Helsinki and Oulu, aiming to develop safe, efficient, and scalable wireless power solutions for challenging environments.

One of the most groundbreaking ideas being explored is known as the “acoustic wire.” This technique uses powerful ultrasonic waves projected into the air to form an invisible channel with reduced electrical resistance. The channel temporarily guides electrical flow, enabling controlled discharges between a transmitter and a receiver. Sound waves stabilize electricity by changing air density along the path.
Early Tests Power Small Devices Wirelessly
In labs, researchers have directed small currents to power sensors and microcontrollers, hinting at future wireless charging and contactless systems.
Another advancing method focuses on energy transfer via light. Researchers convert power into a laser beam and direct it to photovoltaic receivers, providing safe, isolated energy for hazardous environments.
Finnish companies are testing prototypes to power remote equipment, with advances in optics and materials expected to enable commercial use despite distance and atmospheric limits.
Radio-Frequency Harvesting Enables an Invisible Energy Network
At the same time, developments in radio-frequency energy harvesting are leading to an “invisible energy network.” Prototype devices can already extract small amounts of power from ambient electromagnetic signals, including radio, television, mobile, and Wi-Fi transmissions. Although the harvested energy remains limited, it powers ultra-low-power IoT sensors, smart labels, and environmental monitoring systems.
Researchers say this technology could reduce disposable battery use, enabling self-powered devices across smart cities and industries.
Researchers are developing ultrasonic, laser, and radio-frequency methods as a unified wireless energy system, applying each based on environment, power needs, and safety. Lasers and acoustic pathways may suit industrial settings, while radio-frequency energy could support urban sensor networks and smart infrastructure.
Key Technical, Safety, and Scalability Challenges Remain
However, major hurdles still need to be overcome. Key challenges include efficiency over distance, stability in varying conditions, laser safety, and regulating ultrasonic and optical waves. Scaling the technology to higher power levels will also require advanced materials, more complex control systems, and dedicated technical standards.
Even so, specialists believe Finland is already leading a significant shift in the electricity landscape. If ongoing trials succeed outside the lab, wireless power could power devices, redesign industrial facilities, and protect critical infrastructure.
The technology could eliminate connectors in electronics, strengthen remote energy systems, cut maintenance costs, and enable new cable-free applications.
Read the original article on: Regisandrade


























