Patent ID: 6575043
Filing Date: 2003-06-10
Classification: G01F,G01N

Abstract:
An apparatus for measuring one or more parameters related to a fluid flowing in a conduit, the apparatus comprising:at least one transmitter to generate acoustic waves; at least one receiver to receive acoustic energy, the at least one transmitter and at least one receiver being mounted on an outside surface of the conduit; and additional electronic components wherein the transmitter is positioned and directed so as to generate at least one in-wall leaky acoustic wave mode and said receiver is positioned and directed and electronic components are adapted so as to receive and to determine the attenuation of waves having said mode and having propagated entirely within the wall of the conduit from the transmitter to receiver, and wherein at least some of said attenuation is caused by leaking of acoustic energy out of the wall of the conduit into fluid flowing inside the conduit, and wherein said one or more parameters related to the fluid flowing in the conduit are derived at least in part from said attenuation.