研究目的
To propose a two-pronged strategy for reducing motion artifacts in wearable photoplethysmographic biosensors by both cancelling the artifacts and enhancing the signal of interest at the same time.
研究成果
The two-pronged approach significantly improves PPG signal quality by reducing motion artifacts and enhancing the signal of interest, making it suitable for wearable devices. Future research could explore improvements in sensor sensitivity and structural design.
研究不足
The true impulse response cannot be obtained due to the finite movement time of the finger, and the approach may require improvements in auxiliary sensor sensitivity, PPG probe structural design, and digital filter adaptation.
1：Experimental Design and Method Selection:
The study integrates an auxiliary sensor with the optical PPG sensor to exploit their correlations for artifact reduction and signal enhancement.
2：Sample Selection and Data Sources:
The experiments use a finger as the measurement site, with a blood pressure cuff to momentarily suspend blood volume pulses for certain tests.
3：List of Experimental Equipment and Materials:
Includes a reflective photosensor (TCRT1010) from Vishay, a piezoelectric ceramic, and a 3-D printed enclosure.
4：Experimental Procedures and Operational Workflow:
Involves characterizing sensor responses to impulsive movements and blood volume pulses, designing a digital filter for artifact reduction, and assessing performance through signal reconstruction.
5：Data Analysis Methods:
Uses least-squares method for filter design and Bland–Altman plots for performance assessment.
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