System for monitoring and encumbering use of a hand-operated mac

Details System for monitoring and encumbering use of a hand-operated mac System for monitoring and encumbering use of a hand-operated mac

1998-04-28

1999-10-19

Swann, Glen

Communications: electrical

Condition responsive indicating system

Specific condition

180272, 600346, G08B 2100

Patent

active

059696150

ABSTRACT:
A portion a the machine which the operator regularly engages with his or her hands has incorporated therein a plurality of passageways (14) through which a vacuum is applied to draw vapor which is emitted by the hands of the individual. Vapor from the individual's hands is drawn through a sampling apparatus. The sampling apparatus contains an electrical coil (32, 36, 42, 46) which is coated with a composite metal-nonmetal catalytic substance which causes ethanol to oxidize at the coil. When ethanol-containing vapor passes over the coil, oxidation at the coil causes an electrical charge to build up on the coil. The charge build-up is detected and processed in a discriminating type of electrical circuit which incorporates a wheatstone bridge or a constant-current loop. The resulting signal is further processed then ultimately used to estimate the alcohol content of the individual.

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