ALCOHOL DETECTION DEVICE AND VEHICLE PROVIDED WITH THE ALCOHOL DETECTION DEVICE

摘要

An alcohol detection device which is provided on a vehicle and precisely detects alcohol contained in the breath of a driver. The alcohol detection device is provided with a crystal oscillator and a data creation means for verifying. The crystal oscillator is provided with an acohol-detecting oscillation area which has an alcohol-adsorption layer formed on the surface thereof and has the natural frequency thereof varied due to the adsorption of alcohol to the alcohol-adsorption layer, and a reference oscillation area which is provided in an area different from the detecting oscillation area and is a non-alcohol-adsorption area. The data creation means for verifying comprises a means which creates, on the basis of a frequency corresponding to an oscillation output from the detecting oscillation area and a frequency corresponding to an oscillation output from the reference oscillation area, time-series data relating to the difference value between the frequencies; and a means for removing pulsating flow portions contained in the time-series data with the portions regarded as noise. Therefore, variations in frequency due to alcohol are defined.