An Extended System for External Sensors Data Acquisition and Validation During Conducting Polysomnography

This paper proposes an extended system for acquiring external sensor data during polysomnography (PSG) tests. The proposed method intends to provide means for integrating external sensor devices with existing PSG systems in the sleep clinic without modification to the original system. The acquired external sensor data is temporally synchronized with the PSG data through a trigger signal and can be used in subsequent applications. Using our proposed system, we acquire ten additional channels via Polar Verity Sense. We validate the acquired data qualitatively through signal visualization. Then, we compare the derived heart rate (HR) from PPG with those from an electrocardiogram (ECG) in the PSG device to validate our system quantitatively. The result reveals a fair error between PPG and ECG HR, demonstrating an acceptable performance. In addition to the PPG data acquisition, the proposed method can be employed on different external sensors to produce various databases for sleep studies.