In state-of-the-art breath analyzers, the subject has to deliver a forced and prolonged expiration into a mouthpiece. This procedure is time-consuming and requires a significant effort for persons with reduced lung capacity. For hygienic reasons, mouthpieces have to be exchangeable, disposable and taken care of.
With our technology the subject can deliver a short puff of air at 5-10 cm distance to the sensor. By correlation to simultaneous measurement of CO2 the true breath alcohol concentration can be determined using the equation:
Due to the relatively small variability of the undiluted CO2 concentration between individuals, the measured diluted breath alcohol (BrAC) concentration can be normalized using the dilution factor (CO2undiluted/CO2diluted), thus representing the undiluted value.
Both alcohol and CO2 are measured using non-dispersive infrared spectroscopy (NDIR). Our partner SenseAir has built a powerful technology platform for NDIR analyzers. We have developed a flexible user interface enabling a multitude of breath analyzer configurations to be generated.
An extensive list of publications covering both the technology and the analysis of BAC in medical and sobriety testing applications can be found here.