Integration and Testing of a Three-Axis Accelerometer in a Woven E-Textile Sleeve for Wearable Movement Monitoring.

Menglong Li,Kai Yang,Russel Torah,John Tudor,Yang Wei,Helga Nunes-Matos,Steve Beeby

doi:10.3390/s20185033

Menglong Li, Kai Yang + Show 5 more

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https://doi.org/10.3390/s20185033

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Abstract

This paper presents a method to integrate and package an accelerometer within a textile to create an electronic textile (e-textile). The smallest commercially available accelerometer sensor (2 mm × 2 mm × 0.95 mm) is used in the e-textile and is fully integrated within the weave structure of the fabric itself, rendering it invisible to the wearer. The e-textile forms the basis of a wearable woven sleeve which is applied to arm and knee joint bending angle measurement. The integrated e-textile based accelerometer sensor system is used to identify activity type, such as walking or running, and count the total number of steps taken. Performance was verified by comparing measurements of specific elbow joint angles over the range of 0° to 180° with those obtained from a commercial bending sensor from Bend Labs and from a custom-built goniometer. The joint bending angles, measured by all three sensors, show good agreement with an error of less than ~1% of reading which provides a high degree of confidence in the e-textile sensor system. Subsequently, knee joint angles were measured experimentally on three subjects with each being tested three times on each of three activities (walking, running and climbing stairs). This allowed the minimum and maximum knee joint angles for each activity to be determined. This data is then used to identify activity type and perform step counting.

Highlights

Electronic textiles (e-textiles) are becoming widely used in fashion, sports, medical and military applications [1,2]
Electronic sensors woven into a textile can track, for example, heart rate, stress and the temperature of the wearer [5,6]
Thee-textile e-textilemovement movementsensors sensors have been used in experiments to detect armknee andjoint kneeangle, joint identify activity type and count the total steps during an activity

Summary

Introduction

Electronic textiles (e-textiles) are becoming widely used in fashion, sports, medical and military applications [1,2]. Electronic sensors woven into a textile can track, for example, heart rate, stress and the temperature of the wearer [5,6]. Accelerometers are one of the most common electronic sensors used to detect body motion [7] and other applications of accelerometers include aircraft and missile navigation systems, vibration monitoring, image and rotation stabilisation in digital cameras, and drone flight control [8,9,10]. Researchers have used accelerometers in e-textiles to assess fall risk [11], analyse ambulatory human motion [12], quantify physical activity [13] and monitor body movements during rehabilitation [14]

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