Abstract
Recently, a system which can monitor a car driver's biological condition and warn the driver of drowsiness is being proposed. Many researchers have presented evidence that biological signals like brain waves, pulsation waves, and cardiac beat, are different between a wakeful state and a sleep state. However, current systems to measure those signals are assumed to be used in a laboratory or with invasive monitoring. We report on an Air-pressure sensor which is a noninvasive, biological signal-gathering sensor which goes on the car seat. It can measure body signal through the buttocks using a pulse wave-measuring instrument and a strain-type respiration-measuring device.
