A Flexible Two-Sensor System for Temperature and Bending Angle Monitoring.

Yifeng Mu,Xijun Jiang,Rou Feng,Qibei Gong,Yuxuan Liu,Youfan Hu

doi:10.3390/ma14112962

Abstract

A wearable electronic system constructed with multiple sensors with different functions to obtain multidimensional information is essential for making accurate assessments of a person’s condition, which is especially beneficial for applications in the areas of health monitoring, clinical diagnosis, and therapy. In this work, using polyimide films as substrates and Pt as the constituent material of serpentine structures, flexible temperature and angle sensors were designed that can be attached to the surface of an object or the human body for monitoring purposes. In these sensors, changes in temperature and bending angle are converted into variations in resistance through thermal resistance and strain effects with a sensitivity of 0.00204/°C for temperatures in the range of 25 to 100 °C and a sensitivity of 0.00015/° for bending angles in the range of 0° to 150°. With an appropriate layout design, two sensors were integrated to measure temperature and bending angles simultaneously in order to obtain decoupled, compensated, and more accurate information of temperature and angle. Finally, the system was tested by being attached to the surface of a knee joint, demonstrating its application potential in disease diagnosis, such as in arthritis assessment.

Highlights

IntroductionIncreasing numbers of wearable electronics have come into our daily lives and have greatly changed the way we interact with the physical world
Temperature sensors were constructed with serpentine-shaped Pt wires based on the thermal resistance effect
We present a flexible two-sensor system constructed with serpentineshaped Pt wires to record the temperature and bending angle simultaneously

Summary

Introduction

Increasing numbers of wearable electronics have come into our daily lives and have greatly changed the way we interact with the physical world. As a new form of electronics, wearable devices are expected to play an important role in health/medical monitoring [10,11], big data acquisition [12,13], soft robots [14,15,16], and so forth. With the rapid increase in demands to improve people’s quality of life and the growing awareness of medical conditions, various flexible sensors that can be attached to the skin to record physiological signals have been developed for health/medical monitoring purposes

Methods

Results

Conclusion