how do breathalyzers work
Most breathalyzers use one of three technologies to detect Blood Alcohol Content (BAC), which is the concentration of alcohol in a person's blood: a semiconductor oxide sensor, a fuel cell sensor or an infrared spectrometer.Semiconductor oxide-based testers, such as the. or. , are relatively new and very affordable.nfrared Spectrometry is used in large, table-top breathalyzers often found at police stations (and in. ). Spectrometers work by identifying molecules based on the way they absorb infrared light. The level of ethanol in a sample is singled out and measured, and a subject's alcohol level can then be determined.