Improvement of odor-recorder capability for dynamical change of odor

The smell reproduction technique in addition to those for vision and hearing are useful in the fields of virtual environments, games and e-commerce in fragrances and foods. We have developed an odor recorder to record odors using quartz crystal microbalance sensors and to reproduce them based on the recorded data. In this paper, the results of recording dynamical changes in odors in the atmosphere are described. The dynamical changes in the odors were successfully recorded in spite of the rapid change of the odor concentration over a few seconds due to the airflow turbulence. First, the change in a binary mixture of apple-flavor components was successfully recorded using the odor recorder based on a feedback control. Next, the changes in four fruit flavors, apple, mandarin, pineapple, and banana flavors, were successfully recorded using the odor recorder based on a pattern classification method.