Earbud-Embedded Micro-Power mm-Sized Optical Sensor for Accurate Heart Beat Monitoring
| Autor: | Antonino Caizzone, Serj Haddad, Anthony Barison, Assim Boukhayma |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | IEEE Sensors Journal. 21:19967-19977 |
| ISSN: | 2379-9153 1530-437X |
| DOI: | 10.1109/jsen.2021.3098861 |
| Popis: | This work demonstrates that accurate hear beat monitoring, via photoplethysmography (PPG), can be performed at micro-power consumption level with an ear worn device. This is achieved thanks to the combination of a highly sensitive low power PPG chip, an optimal optical module, and an ergonomic design of the wearable device. The monolithic optical sensor is fabricated in a 180nm CMOS image sensor (CIS) process and features an area of 1.5mm by 1.5mm only. It implements an array of pixels, newly designed for PPG, and reaching a quantum efficiency of 85% up to 800nm. The presented sensor consumes 60 $\mu \text{A}$ at 122Hz sampling frequency, including digital communication. The optical design optimization enables high signal-to-noise ratio (SNR) PPG signals with less than 10 $\mu \text{A}$ average LED current. Heart beat monitoring, using the presented wearable device, is performed on 7 subjects and compared with a medical electrocardiogram (ECG). The earbud device correctly detects 98.47% of the beats on a total of 72.21 hours of recordings. The inter-beat interval (IBI) estimation from these recordings features a mean absolute error (MAE) as low as 7.52ms. |
| Databáze: | OpenAIRE |
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