METHOD AND APPARATUS FOR NON-INVASIVELY MEASURING PHYSICAL PROPERTIES OF MATERIALS IN A CONDUIT

Methods and apparatus for non-invasive determination of one or more physical properties of a material in a conduit are presented. In one example, the method comprises initiating a vibration on a wall of the conduit at a first location, capturing a response to the vibration at the first location, capturing a response to the vibration at a second location, and determining at least one physical property of the material based on at least one of the captured responses at the first location and the second location.