9.3.   Methanol, Ethanol and 1-Propanol by the RIfS Array and the 4l Setup

The data sets of ternary mixtures of methanol, ethanol and 1-propanol in air, which are described in section 4.5.2.3 in more detail, were recorded for transferring the principle of time-resolved measurements to other setups and to other detection principles. The measurements were performed by the two RIfS devices, the sensor array setup and the low-cost 4l setup. As the signal to noise ratio is rather poor for the measurement by the RIfS array setup (3 Makrolon layers and 1 PUT layer), it is investigated if a smoothing of the sensor responses can improve the calibration. Additionally single-sensor RIfS setups are simulated by evaluating only single sensors of the array setup. Finally, the low-cost 4l setup is compared with the array setup.