Researchers Use Infrared Light To Wirelessly Transmit Power Over 30 Meters

A research team from Sejong University in South Korea has demonstrated a new system which uses infrared light to safely transfer high levels of power. Laboratory tests showed that it could transfer 400 mW of light power over distances of up to 30 meters. This power is sufficient for charging sensors, and with further development, it could be increased to levels necessary to charge mobile devices.

Distributed laser charging works somewhat like a traditional laser, but instead of the optical components of the laser cavity being integrated into one device, they are separated into a transmitter and receiver. When the transmitter and receiver are within a line of sight, a laser cavity is formed between them over the air—or free space—which allows the system to deliver light-based power. If an obstacle cuts the transmitter-receiver line of sight, the system automatically switches to a power-safe mode, achieving hazard-free power delivery in the air.

Now that they have demonstrated the system, the researchers are working to make it more practical. For example, the efficiency of the photovoltaic cell could be increased to better convert light into electrical power. They also plan to develop a way to use the system to charge multiple receivers simultaneously. Read the full article here.

David Shiller

David Shiller is the Publisher of LightNOW, and Senior Business Development Consultant at Capacity Consulting, a North American consulting firm providing business development services to advanced lighting manufacturers. The ALA awarded David the Pillar of the Industry Award. David has been co-chair of the ALA’s Engineering Committee since 2010. David established MaxLite’s OEM component sales into a multi-million dollar division. He invented GU24 lamps while leading ENERGY STAR lighting programs for the US EPA. David has been published in leading lighting publications, including LD+A, enLIGHTenment Magazine, LEDs Magazine, and more.

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