University of Alberta researchers, in collaboration with Canada’s Department of National Defence, have unveiled a miniature sensor that operates without a battery. The sensor is capable of monitoring vital signs and identifying frostbite in soldiers enduring extreme cold conditions. This innovative technology offers a wide range of applications beyond military settings.
Ashwin Iyer, a faculty member at the University of Alberta’s engineering school, leads a team engaged in a long-term project under the Department of National Defence’s Innovation for Defence Excellence and Security initiative. The project aims to leverage commercial telecommunications technology for military purposes. The university’s expertise lies in developing SWaP-C systems, which are renowned for being compact, lightweight, energy-efficient, and cost-effective.
During an interview on CBC’s The Trailbreaker, Iyer discussed the sensor’s design for extreme cold environments. The sensor is intended to be worn by soldiers to track metrics such as heart rate, respiration, core body temperature, and extremity temperature. The goal is to provide real-time health monitoring to assist commanders in identifying potential health issues like frostbite and ensuring timely intervention for troops in challenging situations.
Traditional battery-powered devices often fail in extremely cold temperatures, such as -70°C, due to limitations in lithium-ion battery technology. To address this issue, the sensor eliminates the need for batteries by utilizing energy harvested from the surroundings. This energy-harvesting technology, based on radio frequency identification, enables the sensors to power themselves using radio frequency waves commonly found in everyday communication devices.
The sensor’s power sustainability is achieved through various energy-harvesting methods, including motion-based energy harvesting. By using tiny chips that absorb energy from radio frequency waves, the sensors can perform sensing tasks and transmit data efficiently.
The development process involved meeting specific criteria, such as ensuring wireless functionality and minimal interference with regular operations. To miniaturize the sensors effectively, extensive research spanning 80 years of antenna technology was conducted to optimize their performance.
In practical scenarios, the sensors can detect frostbite by monitoring core body temperature and extremity temperatures, providing early warnings to prevent serious health complications. Beyond military applications, the technology holds promise for emergency response and public health monitoring in extreme environments.
The sensors are capable of operating in a wide temperature range, from extreme cold to high temperatures, making them versatile for global use. Apart from military and emergency response, the sensors can be deployed for various applications, such as detecting environmental hazards like flooding or gas leaks. This innovation underscores the potential of military-driven technological advancements to benefit civilian sectors.