Abstract
A highly sensitive magnet-displacement sensor was constructed by using a pair of amorphous wire magnetoimpedance elements as the head of a resonant-multivibrator- type field sensor. The sensor output is independent of the magnetic pole sign on account of the magnetoimpedance characteristics, which allow highly operable measurement of eyelid motion. Sleepiness was sensed by noncontact detection of the movements of both eyelids. Two small magnets were attached to the eyelids and their movements were detected by using a field sensor fixed to a glass frame. Sleepiness was clearly detected for a special oscillation pattern, specific to each subject, of a pursuit target.
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