Driver drowsiness detection optical three dimensional object recording sensor unit images and times reemitted light from switched laser beams

摘要

A driver drowsiness detection optical three dimensional object (9) recording sensor unit has a hologram (4) dividing a laser (1) light beam (3) into sequentially switched (10) diverging beams (4-8) and a matrix sensor (12) with Fresnel lens (11) imaging light reemitted by the drivers head for transit time measurement (23). Independent claims are included for a driver drowsiness detection unit using reflection of the beams from the car windscreen.