Alcohol Sensing

Sober Driver - Sensor inVehicles

Within Senseair we have a group entirely dedicated to development of alcohol sensing technology and applications. Our core competence is in the areas of sensor technology, measurement systems, microsystems, physiological interactions, mechatronic design, and man-machine interfacing.

We have a well-equipped laboratory for prototyping, small-scale production and testing. Together with a network of partners, we are capable of managing projects from idea to production. 



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). We have built a powerful technology platform for NDIR analyzers. On top of that 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.