Chinese Researchers Develop Laser-Powered Drone Charging System
Researchers in China have designed an innovative system to address the limited battery life of drones, which often restricts their operational capabilities in critical applications like disaster response, infrastructure inspection, and delivery services. The proposed solution involves transmitting power to a drone mid-flight using lasers, potentially enabling significantly extended flight times. Current drones typically require recharging or battery swaps after less than an hour, limiting their utility for long-distance deliveries or extensive surveying tasks.
The team, from the Civil Aviation University of China and Tsinghua University, developed a novel receiver using perovskites, a material commonly found in solar panels. This 2 square centimeter receiver is lightweight and efficient enough to power a drone's propeller. Senior author Jianhua Han explained that the system would utilize ground or airborne transmitters to emit laser beams, providing continuous power to unmanned aerial vehicles (UAVs) in flight. A key challenge in laser power transmission is overheating, which degrades efficiency and can damage components. To mitigate this, the researchers employed a cesium lead bromide perovskite, known for its stability at high temperatures. They also incorporated a carbon electrode with antimony selenide nanorods, which act as a thermal barrier and improve current flow, protecting the perovskite layer from excessive heat.
Tests demonstrated a power conversion efficiency of nearly 39 percent when a 5-watt green laser was directed at the receiver, sufficient to spin a propeller at 7,820 rpm. Further integration into a stationary drone model, with enhanced cooling channels, allowed a propeller to run at 1,200 to 1,450 rpm for about a minute. However, the researchers acknowledge limitations, including the need for outdoor testing to assess performance under variable conditions like natural wind and sunlight. Significant engineering challenges remain, particularly concerning the safe and precise targeting of moving drones with high-power lasers and preventing harm to other aircraft or ground organisms. The team is focused on receiver development while collaborating on beam targeting and safety systems, with plans for flight tests on a lightweight drone to validate the concept.
This research presents a novel approach to extending drone operational endurance by enabling mid-flight wireless power transfer via lasers. The system's reliance on perovskite materials offers potential advantages in cost and manufacturing efficiency compared to traditional photovoltaic technologies. However, significant engineering and safety hurdles must be overcome before widespread adoption. The primary challenges include ensuring precise and safe laser targeting of airborne vehicles, managing thermal loads on the receiver to maintain efficiency and prevent damage, and mitigating risks to other aircraft and living organisms. Future development will likely focus on robust beam control, advanced cooling mechanisms, and comprehensive safety protocols. The long-term viability hinges on balancing the demonstrated efficiency gains with the complex operational and regulatory considerations inherent in deploying high-power laser systems in shared airspace.
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