Power through thin air might soon be more than a sci‑fi promise. A team in Tokyo has demonstrated a camera-guided infrared system that can beam energy to small photovoltaic receivers from up to 16 feet away, even when the target is moving and regardless of ambient lighting. While the prototype is still relatively inefficient, it points to a future where tiny Internet of Things devices and sensors could run without batteries or wires.
Here’s how the approach works. A camera locks onto the position of a small photovoltaic cell and a narrow infrared LED beam delivers energy directly to that spot. Because the system continuously tracks the receiver, it can maintain a power link as the target shifts around a room. And since the receiver is designed to convert infrared light, it works whether the room is bright, dim, or in changing light conditions.
Why this matters: today’s IoT sensors often rely on coin cells or hard-to-access wiring. Batteries add cost, require maintenance, and create waste. Over-the-air power delivery could keep sensors alive for months or years without anyone swapping batteries, especially in locations where maintenance is difficult—inside walls, high ceilings, factory lines, smart shelves, or remote corners of a building.
A few key points stand out:
– Wireless power delivery at a distance of up to 16 feet (about 5 meters)
– Camera-guided tracking keeps the beam aligned with moving targets
– Works independently of ambient light, since it uses an infrared LED source
– Early-stage efficiency, suitable for low-power electronics rather than energy-hungry devices
Potential applications are broad wherever low-power electronics are deployed. Think batteryless temperature and humidity sensors in warehouses, occupancy and asset trackers in offices, structural monitoring in smart buildings, or environmental sensors in agriculture. In retail, shelf labels and inventory beacons could stay powered without frequent maintenance. Even wearables that demand minimal power might benefit in controlled environments.
There are practical considerations. Line of sight is essential for a beamed system—obstacles can interrupt power delivery. Current efficiency limits make it best for ultra-low-power devices rather than gadgets like smartphones. Safety and regulatory standards around directed infrared light also need to be observed and refined. And scaling from a single link to dozens or hundreds of devices in a space will require smart beam management and coordination.
Still, the pathway for improvement is clear. Advances in high-efficiency infrared LEDs, better optics, and faster, more accurate camera tracking could boost power delivery and reliability. On the receiver side, more sensitive photovoltaic materials and power management circuits can squeeze more energy from each photon. Software that predicts motion and optimizes beam steering could further stabilize the link to moving targets.
For businesses and developers building the next wave of connected devices, the appeal is obvious: lower maintenance costs, fewer battery replacements, and the freedom to place sensors wherever they’re needed without worrying about wiring. Pair this with energy harvesting from ambient sources, and IoT nodes could operate with a hybrid approach—drawing steady power from an infrared beam when available and sipping from harvested energy at other times.
The bottom line: camera-guided infrared power beaming is still early, but it’s a compelling step toward practical, room-scale wireless power transmission. As efficiency improves, it could transform how we deploy and sustain the countless small sensors that make smart homes, offices, and factories run.
