BREATH ALCOHOL CONCENTRATION DETECTOR

摘要

A breath temperature change detection portion (16) and a breath determination. portion (18) obtain a temperature detected by a breath temperature detection sensor (14). When the temperature measured by the breath temperature detection sensor (14) decreases due to breath during a predetermined period, the breath determination portion (18) determines that an alcohol concentration detected by the alcohol detection sensor (12) is an invalid value. When the.temperature measured by the breath temperature detection sensor (14) increases due to breath during the predetermined period, the breath determination portion (18) determines that the alcohol concentration detected by the alcohol detection sensor (12) is a valid value indicating the alcohol concentration in the breath of a subject.