Non invasive bio sensing for eye blinking and head movement

The authors present several sensing mechanisms and associated electronics developed to sense and monitor eye blinking and head nodding. The muscular vibrations around the eye are sensed by a piezoelectric crystal, a mechanical eye-blink sensor that provides the same information about eye-blinking as the optical sensor. An eight-plate metallic castle with a rotating metallic ball is the basis for the head movement or nodding sensor. The relative position of the ball within the castle provides information about the head movement. Sixteen head positions can be configured, providing very valuable information about the rate of head movement and pattern of head movement. The information from these sensors is being used in the development of expert systems for the measurement of human fatigue and similar applications.<>