Patent ID: 6823716
Filing Date: 2004-11-30
Classification: G01H,G01N

Abstract:
A transit time speed of sound sensor for gaseous media, comprising:a helical channel having a generally cylindrical shape, such that it encloses an inner chamber; end pieces at each end of the inner chamber, such that the inner chamber may contain the gas to be tested; a gas input port operable to receive a flow of gas into the helical channel; wherein the helical channel is arranged such that gas may enter the helical channel, flow through the helical channel, and enter the inner chamber; a dual-faced target at one end of the chamber; a transducer at the opposing end of the chamber, the transducer operable to produce an ultrasonic pulse in the gas and to receive a reflection of the pulse from each face of the target; and a gas output port operable to exhaust gas from the chamber.