Patent ID: 6279378
Filing Date: 2001-08-28
Classification: G01N

Abstract:
An ultrasonic gas analyzer for analyzing gases within a gas/air mixture, said ultrasonic gas analyzer comprising:an acoustic cavity having at least one transducer;an inlet for said acoustic cavity and an outlet for said acoustic cavity;an air mechanism relative to said outlet for drawing said gas/air mixture or air from said inlet through said acoustic cavity to said outlet; andelectronic circuitry for controlling said transducer to propagate a high frequency ultrasonic wave across said acoustic cavity that is reflected within said acoustic cavity through said gas/air mixture or said air flowing through said acoustic cavity, said electronic circuitry receives from said transducer a signal indicative of said ultrasonic wave as it is reflected in said acoustic cavity and monitors a fifth reflection of said ultrasonic wave for determining said gas within said gas/air mixture based at least in part on the time of flight of said ultrasonic wave across said acoustic cavity when said gas/air mixture is flowing through said acoustic cavity and when said air is flowing through said cavity.