EQUIVALENT CIRCUIT OF ENVIRONMENT SENSOR, MEASURING METHOD OF ODOR PRESSURE, STANDARDIZING METHOD OF ODOR PRESSURE, DETECTING DEVICE OF ODOR AND DETECTING DEVICE OF FIRE

摘要

PURPOSE: To determine a resistance value being changed by an odor pressure and to enable measurement of the odor pressure by using an equivalent circuit constructed by connecting a saturation resistor in series to a parallel connection of a resistor being affected by an environment and a resistor being changed by the odor pressure. ;CONSTITUTION: A resistance Z is the total resistance of an odor sensor 1, while a resistance r_o is a resistance at the time of saturation of the sensor 1, and they are values inherent in the odor sensor l respectively. A resistance r_a is affected by the whole of an environment such as temperature, humidity and an odor other than an object of detection, for instance. When a resistance r_n is a resistance changed by an odor pressure, the total resistance Z can be expressed by an equivalent circuit constructed by connecting the resistance r_o in series to the parallel connection of the resistances r_a and r_n. When it is assumed that the resistance r_n is changed in a range from infinity to 0 by the odor pressure, the total resistance Z becomes the r alone at the time of saturation. At the time when the odor pressure is 0, the resistance r_n is infinite and the total resistance Z becomes the sum of the r and the r_a and is changed only by the environment. By determining the resistance r_o from a saturation level and by determining the resistance r_a at the time when the odor pressure is at a 0 level, accordingly, the resistance r_n can be calculated inversely from a sensor output.;COPYRIGHT: (C)1995,JPO