Patent ID: 6691582
Filing Date: 2004-02-17
Classification: G01N

Abstract:
A gas type identification system comprising:a flow path; an ultrasonic measurement section disposed in the flow path, the ultrasonic measurement section including a pair of ultrasonic transducers; a flow rate calculation section for calculating a flow rate of a gas flowing through the flow path based on a signal from the ultrasonic measurement section; a sound velocity calculation section for calculating a sound velocity of a gas flowing through the flow path based on a signal from the ultrasonic measurement section; a sound velocity memory section for previously storing a relationship between gas types and predetermined sound velocities; and a comparison section for comparing the sound velocity calculated by the sound velocity calculation section with at least one of the predetermined sound velocities in the relationship previously stored in the sound velocity memory section and for identifying a gas type of the gas flowing through the flow path in accordance with a result of the comparison.