Detection device

A detection device for detecting the characteristics of a mixed fluid containing different types of substances with different thermal properties within a prescribed range, the detection device comprising:

• one or a plurality of heaters for heating the mixed fluid;
• a plurality of temperature detectors for detecting the temperature of the mixed fluid heated;
• a flow rate calculation unit for calculating the flow rate of the mixed fluid using the output from at least a portion of the plurality of temperature detectors, the flow rate calculation unit comprising the heater and at least a portion of the plurality of temperature detectors;
• a correspondence relation storage unit that stores the correspondence relation between the output from the temperature detectors for a prescribed flow rate and the mixture ratio of the substances in the mixed fluid;
• and
• a mixture ratio calculation unit for calculating the mixture ratio of the substances in the mixed fluid on the basis of the output from the temperature detectors and the correspondence relation, wherein
• the detection device uses the output from the temperature detectors which do not constitute the flow rate calculation unit and which are provided on a different flow path from the flow path provided with the plurality of temperature detectors constituting the flow rate calculation unit, the temperature detectors which do not constitute the flow rate calculation unit provided side by side in a direction different from the direction in which the mixed fluid flows to calculate the physical properties of the mixed fluid;
• and
• the mixture ratio calculation unit calculates the mixture ratio of the substances in the mixed fluid on the basis of the outputs from the temperature detectors used to calculate the physical properties and the correspondence relation.