University of Alberta researchers, in collaboration with Canada’s Department of National Defence, have unveiled a miniature battery-free sensor capable of monitoring vital signs and detecting frostbite in soldiers exposed to extreme cold conditions. This innovative device, however, offers a wide range of potential applications beyond military use.
Heading the project is Ashwin Iyer, a professor at the University of Alberta’s engineering faculty, engaged in a long-term partnership with the Department of National Defence’s Innovation for Defence Excellence and Security program. The initiative aims to adapt commercial telecommunications technology for military purposes, leveraging the university’s cutting-edge expertise in developing SWaP-C systems – technology characterized by minimal size, weight, power, and cost.
In an interview with CBC’s Shannon Scott on The Trailbreaker, Iyer emphasized the sensor’s role in addressing health monitoring challenges in extreme environments, such as those faced by soldiers stationed in the High Arctic. The envisioned network of biometric sensors, worn by soldiers, is designed to track crucial health metrics like heart rate, respiration, and body temperature to promptly identify health issues like frostbite and ensure timely intervention.
Traditional battery-powered devices often fail in temperatures as low as -70°C due to the limitations of lithium-ion battery technology, which struggles to function effectively in cold environments. To overcome this, the new sensors are engineered to operate without batteries by harnessing energy from their surroundings. This energy harvesting approach, based on radio frequency identification technology, allows the sensors to power up using absorbed energy from radio frequency waves, enabling them to perform sensing tasks and transmit data wirelessly.
The development process involved meeting stringent criteria, including wireless functionality and ultra-compact size to avoid disrupting regular operations. The miniaturization of antennas, crucial for wireless communication in the sensors, required a deep dive into decades of antenna research to optimize their performance.
The sensor’s real-time monitoring capabilities, including early detection of frostbite, are highlighted by the deployment of sensors on vital body areas prone to frostbite, triggering alerts when temperature thresholds are exceeded. This proactive approach allows for timely intervention to mitigate the effects of frostbite and other health risks.
Beyond military applications, the technology holds promise for emergency response scenarios and broader usage in extreme environments globally, spanning from frigid conditions to high temperatures. The versatility of these sensors extends to various applications such as detecting environmental hazards like flooding or carbon monoxide, showcasing their potential for civilian use beyond military contexts.