A wireless batteryless piezoresistive pressure sensing system

摘要

A wireless batteryless piezoresistive pressure sensing system was presented. The sensing system adaptsRFID operation principles including a transponder and a reader. The transponder device includes anenergy harvesting circuit, force sensing resistors, a resistance-to-frequency converter, and an antenna. Thereader provides radio frequency power to the device remotely and measures the sensor values in terms offrequency shift simultaneously. The performance of the system was characterized form 0 to 10 psi whilethe corresponding modulated frequency shift by the reader was between 7.35 kHz and 8.55 kHz. Apressure sensor array was arranged to identify high pressure points dynamically for long-term usage.