Abstract
In this work, we report an active respiration monitoring sensor based on a piezoelectric-transducer-gated thin-film transistor (PTGTFT) aiming to measure respiration-induced dynamic force in real time with high sensitivity and robustness. It differs from passive piezoelectric sensors in that the piezoelectric transducer signal is rectified and amplified by the PTGTFT. Thus, a detailed and easy-to-analyze respiration rhythm waveform can be collected with a sufficient time resolution. The respiration rate, three phases of respiration cycle, as well as phase patterns can be further extracted for prognosis and caution of potential apnea and other respiratory abnormalities, making the PTGTFT a great promise for application in long-term real-time respiration monitoring.
Highlights
Respiratory diseases are the second leading (~6.5%) cause of mortality globally [1]
We propose an active self-driven wearable piezoelectric sensor intended for real-time respiration monitoring
Different from a passive piezoelectric transducer with a sandwich structure, an active sensor is architected by a piezoelectric transducer and a dual-gate thin-film transistor (DG-TFT) forming a piezoelectric-transducer-gated TFT (PTGTFT)
Summary
Respiratory diseases are the second leading (~6.5%) cause of mortality globally [1] They are preventable if a reliable and accurate monitoring method is implemented. ECG monitors electrical stimulus response of lungs from multiple leads and TI-PPG monitors small change in tissue volumes upon respiration. Both require the examined body to be immobile during examination for accurate and reliable measurements. Such commercially-available devices are not well-suited for wearable and real-time monitoring in daily activities. They are bulky and consume a lot of power, which is inconvenient for long-term operation
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