| 摘要 |
A method of measuring breath alcohol includes blowing breath in a stream through an inlet line, hence through an orifice, past a thermistor exposed to the stream, changing the temperature of the thermistor to a predetermined temperature in response to a predetermined volume of breath. The thermistor provides an output signal to trigger the measurement of alcohol in the breath by an alcohol detecting device. The method and apparatus permit the purging of the system to provide a base line reference for the alcohol detection device, then testing to ensure that the breath inlet line is clear of contamination, then running an alcohol standard sample through the alcohol detecting device, again purging the system, again testing to ensure that the breath inlet line is clear of contamination, recording the result as a blank test, and thereafter blowing breath through the inlet line to obtain a demonstratably accurate measurement of breath alcohol.
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