MOUTH ODOR DETECTION DEVICE AND REGULATING METHOD THEREFOR

摘要

A mouth odor detection device for detecting various mouth odor-causing gas components varying in a short time or over an extended period of time due to paradental diseases, daily living habits such as eating and smoking and health conditions and for examining a mouth odor; and a regulating method therefor. In a regulating mode, a regulating gas (a mixture of methylmercaptan and ethylene in a mixing ratio of 1 : 10) is sprayed over a metal oxide semiconductor gas sensor (3) in a high temperature condition. Then, a microcomputer (5) computes, when a high temperature condition-to-low temperature heating-switching is started, a reference resistance R0 of the metal oxide semiconductor gas sensor (3). In addition, during a transition period from the start of shifting to the low-temperature heating to a resistance stabilization of the gas sensor (3), the microcomputer (5) determines a resistance Rs of the gas sensor (3) and a ratio Rs/R0 and stores the ratio along with Rs and R0 in an EEPROM (6) as reference value data.