Unobtrusive in-car measurement of physiological signals on the road.

This paper presents a system for unobtrusive monitoring of physiological signals of a car driver. It comprises three sensor modalities that conduct measurements through clothes: a Magnetic induction sensor for respiration monitoring, and a reflective Photoplethysmograph as well as a capacitive Electrocardiograph for cardiac monitoring. The sensor system has been attached to the driver seat of a car and a healthy subject was asked to drive through the busy streets of Tokyo while monitored. The raw signals of the unobtrusive Photoplethysmograph and capacitive Electrocardiograph present an overall promising quality. The Magnetic induction sensor worked best with the driver not moving.