Prediction of steady-state response for gas sensors based on quartz crystal microbalance

The study of transient response is necessary to characterize gas sensors in a dynamical system to be used in real time. The transient response to a step function is often used since it is the easiest stimulus to generate and provides useful information about the characteristics of the sensor. We implemented a system to measure the transient response which is based on a vapor generator of volatile organic compounds in combination with a valves arrangement. This system is used to generate a step function variation in the concentration of the odor vapor. For the analysis of the response, we used a bi-exponential model. In the present work, we show the prediction of the steady-state sensor response using a few seconds. A comparison of the results obtained using a frequency counter with a sampling rate of one data per second and another one with five data per second is presented.