Study of robust odor sensing system with auto-sensitivity control

An odor sensing system should be robust against the influence of the environmental changes such as changes of concentration, humidity and temperature. We proposed a new structure of a preconcentrator device directly connected to the sensors to speed up the measurement cycle. This structure enabled the rapid adjustment of the accumulation time of the vapor to keep one of the sensor responses constant. This function of the auto-sensitivity control was effective to achieve the sensing system robust against the changes of the concentration and humidity.