Odor sensing characteristics in residential space using metal-oxide sensors

Various odors are generated in an indoor environment. It is necessary to know the kinds and grades of odors in order to recognize patterns of behavior in the daily life of a resident. In this study, four kinds of odor sensors are adopted, all of which are the metal oxide type. The daily behavior of the resident is recognized and understood using sensor-output characteristics. A sensor unit, which consists of four odor sensors, is installed in the residence. Twelve sensor units are set up at various points. Opening and shutting a door, taking a meal and sleeping can be identified as behavior based on the sensor characteristics. A running spectrum-method, which is a kind of frequency analysis, is used to identify the operation of an air-conditioner. The spectrum has a high frequency component at meal times. The aim of this system is to construct a surveying system for the aged individual living alone as a part of a welfare system.