Breath testing system
Abstract
Abstract A GAS SAMPLE TESTING SYSTEM RECEIVES DEEP LUNG BREATH FROM A SUBJECT FOR DETERMINING ALCOHOL CONCENTRATION. A BREATH INPUT UNITS DELIVERS A SAMPLE OF DEEP LUNG BREATH THROUGH A CONTROLLER TO AN EVALUATOR WHICH INCLUDES AN ALCOHOL DETECTOR. THE CONTROLLER INCLUDES A BREATH PRESSURE SENSITIVE SWITCH AND A TIMER, TO INSURE CONTINUOUS BREATH FLOW FOR A PREDETERMINED PERIOD (E.G., 5 SECONDS) PRIOR TO TESTING. THIS ARRANGEMENT SECURES A DEEP LUNG BREATH SAMPLE FOR TESTING. THE DETECTOR HAS A WHEATSTONE BRIDGE WITH A CATALYTIC RESISTANCE LEG FOR CONTACT WITH THE GAS SAMPLE. THE DETECTOR PROVIDES AN INFORMATION SIGNAL CONNOTING ALCOHOL CONCENTRATION IN THE GAS SAMPLE. THIS INFORMATION SIGNAL IS COMPARED WITH A STORED, PREVIOUSLY TAKEN, SIGNAL FROM THE SAME DETECTOR TO COMPENSATE THE ZERO DRIFT. THE RESULTANT OUTPUT SIGNAL IS DISPLACED ON A METER, OR USED TO ENERGIZE A SIMPLE PASS-FAIL INDICATOR.
Inventors
- 👤 A Mamo
- 👤 D Collier
- 👤 J Hoppesch
Bibliographic Details
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