Near Field Communication (NFC) is a short-range wireless communication technique that has become attractive devices for healthcare and wellbeing monitoring. The work reported here demonstrates the development of a battery free wearable sensing system with temperature and sweat sensors embedded into and powered by a smart textile NFC antenna. The NFC antenna is seamlessly integrated with closed-body garments, and sensor data can be easily acquired by NFC readers and smart phones in order to achieve real time and wireless monitor of health status in a convenient and non-intrusive way. A Dickson charge pump circuit has been designed and implemented in order to pump up the voltage and ensure a steady voltage supply for the sweat sensor. The maximum read range for accessing sensor data is 6 cm. The on-body measurement accuracy of the temperature sensor and sweat sensor are able to achieve $\pm$ 0.14°C and $\pm$ 0.2%, respectively. The presented system can provide wearable battery-free ubiquitous wireless connectivity for point-of-care and any time healthcare and wellbeing monitoring.
|Journal||IEEE Journal of Electromagnetics, RF and Microwaves in Medicine and Biology|
|Early online date||22 Jul 2019|
|Publication status||Published - 2019|
- temperature sensors
- intelligent sensors
- antenna measurements
- wireless communication