Key result
The proposed passive electric potential sensors successfully measured ECG, respiration cycle, and EEG signals at non-contact distances of approximately 50 cm, 100 cm, and 5 cm, respectively.
Why the study?
Can high-sensitivity electric potential sensors accurately measure physiological signals without contact compared to reference contact sensors in healthy adults?
Can high-sensitivity electric potential sensors accurately measure physiological signals without contact compared to reference contact sensors in healthy adults?
High-sensitivity electric potential sensors can successfully acquire ECG and respiration signals without contact at distances up to 50-100 cm, offering potential for wireless, non-invasive physiological monitoring.
May enable remote monitoring research; leaves open clinical validation in patients before practice consideration.
The paper describes highly-sensitive passive electric potential sensors (EPS) for non-contact detection of multiple biophysical signals, including electrocardiogram (ECG), respiration cycle (RC), and electroencephalogram (EEG). The proposed EPS uses an optimized transimpedance amplifier (TIA), a single guarded sensing electrode, and an adaptive cancellation loop (ACL) to maximize sensitivity (DC transimpedance= 150\,\,GΩ) in the presence of power line interference (PLI) and motion artifacts. Tests were performed on healthy adult volunteers in noisy and unshielded indoor environments. Useful sensing ranges for ECG, RC, and EEG measurements, as validated against reference contact sensors, were observed to be approximately 50 cm, 100 cm, and 5 cm, respectively. ECG and RC signals were also successfully measured through wooden tables for subjects in sleep-like postures. The EPS were integrated with a wireless microcontroller to realize wireless sensor nodes capable of streaming acquired data to a remote base station in real-time.
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Tang et al. (2022) studied Healthy (n=8). High-Sensitivity Electric Potential Sensors (EPS) vs. Reference contact sensors was evaluated on Useful sensing ranges for ECG, RC, and EEG measurements. The proposed passive electric potential sensors successfully measured ECG, respiration cycle, and EEG signals at non-contact distances of approximately 50 cm, 100 cm, and 5 cm, respectively.
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