Differential-deformation structured pressure sensor for stable measurement of superficial temporal artery pulse

Abstract

Recent developments have focused on flexible pressure sensors due to their potential for real-time and personalized health monitoring. However, measuring epidermal pressure signals using flexible pressure sensors is frequently plagued by various motion artifacts, which significantly impede the stable monitoring of physiological signs. In this study, we have developed an earphone-mounted flexible pressure sensor (EMFPS), which is composed of polymer materials with differential deformation ability. The EMFPS exhibits a sensitivity of 1.78 V/kPa, demonstrating a notable low-frequency response ranging from 1 to 30 Hz and good robustness even after 7200 operating cycles. Given these compelling features, the EMFPS mounted on the earphone is capable of detecting tiny superficial temporal artery pressure under various static forces, while simultaneously maintaining stable monitoring of pulsations during walking activities. The EMFPS embodies a simple and comfortable technology for achieving on-the-go personalized health monitoring in daily life.