Breath analyzer system and method of operating the same

摘要

A breath analyzer system 10 and method 400 for determining an estimate of blood alcohol concentration of a person 16. A light source 24 projects light into a sampling region 16 where breath from the person 16 is expected. A first light detector 28 and a second light detector 32 are configured to detect light intensity of light having certain wavelengths at a first time T1 and a second time T2. Signals from the light detectors 28, 32 at the first time T1 and the second time T2 are used to determine an estimate of the blood alcohol concentration of the person 16 by determining a ratio of a first light detector signal change ”VE to a second light detector signal change ”VE.