University of Alberta researchers, in collaboration with Canada’s Department of National Defence, have introduced a miniature battery-free sensor capable of monitoring vital signs and detecting frostbite in soldiers operating in severely cold conditions. The sensor, developed as part of a long-term project with the Department of National Defence’s Innovation for Defence Excellence and Security program, aims to leverage commercial telecommunications technology for military applications. Ashwin Iyer, a professor at the University of Alberta’s engineering faculty, leads the initiative, focusing on cutting-edge research in SWaP-C systems – technology characterized by minimal size, weight, power, and cost.
In an interview with CBC’s Shannon Scott on The Trailbreaker, Iyer discussed the sensor’s innovative features and potential applications. The sensor is specifically designed to function in extreme cold environments, with the capability to operate in temperatures as low as -70°C. Traditional battery-powered devices often fail in such harsh conditions due to the limitations of lithium-ion battery technology. Seeking to overcome this challenge, the research team opted to eliminate batteries altogether and instead enable the sensors to harvest energy from their surroundings.
The sensor’s power is sustained through energy harvesting methods, such as motion-based energy extraction, utilizing radio frequency identification technology commonly found in daily life. These sensors absorb energy from radio frequency waves, akin to those used in cell phone communication, to power themselves for monitoring and transmitting data. The team had to innovate extensively to miniaturize the sensors, delving into decades of antenna research to ensure functionality without interference.
One primary objective of the sensor is to detect frostbite early to prevent serious complications. By strategically placing sensors to monitor core body temperature and extremities susceptible to frostbite, the system can alert users when temperature thresholds are reached, facilitating timely intervention. Beyond military applications, the technology holds promise for emergency response scenarios and other environments with extreme temperature variations.
With a temperature range spanning from -70°C to high temperatures, the sensors offer versatility for global use. Additionally, beyond military and emergency response contexts, the sensors have potential applications in various settings, such as detecting hazards like flooding or carbon monoxide in residential spaces. This innovation underscores the broader utility of military-driven technological advancements in everyday life scenarios.
