Abstract

This study proposes a new approach for non-contact based pulse transit time (PTT) measurement using microwave and image sensors. The microwave sensor detects heartbeats using reflected wave signal from a subject's chest, and the image sensor obtains pulse-arrival times using a subject's face image sequences. By temporally synchronizing these sensors, the proposed system calculates the time difference between a heartbeat and a pulse, thus allowing PTT to be remotely obtained. Using basic experiments conducted on six independent subjects, we were able to physically measure PTT (around 180 ms). Our results strongly indicated the potential viability for widespread use of the proposed method for non-contact-based PTT measurement.

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