Abstract

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Title:: Development of a wearable respiration detection system based on polyvinylidene fluoride film

Author(s):: QIU Xiaoye; YAN Rongguo; LI Junguo; LI Yongyang; School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China

Keywords:: ; Keywords: polyvinylidene fluoride film; respiration detection; smooth filtering; adaptive dual-threshold; respiratory rate

Abstract:: Abstract: In view of the characteristics of human respiratory signals, a wearable respiration detection system based on polyvinylidene fluoride (PVDF) piezoelectric film is proposed. The induced charge collected from human respiration by a PVDF thin film is relatively weak, and converts to the voltage by signal conditioning circuit. The microcontroller obtains the respiratory signal data through analog-to-digital converter, and sent to the host computer via Bluetooth. The host computer extracts the respiratory waveform from the obtained data and calculates respiratory rate via smooth filtering and adaptive dual-threshold technique. The experimental results showed that the system can accurately detect the respiratory waveform of the human body, and that the accuracy rate of the recognition of the number of breaths is above 90%, which meets the needs of human respiration monitoring.