Abstract: A method and an apparatus are provided for measuring the wall thickness of a pipeline through which a fluid flows, the pipeline having an interior and exterior surface. The apparatus has a pig body supported by elastomeric cups to thereby cause the pig body to move by fluid flow through the pipeline. The pig body supports a plurality of multi-element transducers. Each transducer is made up of a large number of independent elongated rod-like crystal elements separated by a polymer, each having side walls, a front face and a bottom face. The rod-like elements are arranged so that the side walls are adjacent but mechanically isolated from each other, such as by an epoxy, with the front faces and bottom faces providing transducer front and bottom surfaces. A front metallic film and a bottom metallic film are applied to the front and the bottom surfaces. Each transducer is configured to have an impedance that closely matches the impedance of the pipeline fluid.

Abstract: An improved universal mount system for receiving a sensing device positionable in a plurality of locations and orientations comprising in combination a base having a plurality of threaded leveling lugs extending therethrough for independent adjustment of the corners of the base, the base also having upwardly extending plates with apertures therethrough; a table having a pair of downwardly depending plates each with an arcuate slot and a thumb bolt extending therethrough into the aperture of an adjacent upwardly extending plate for tilting of the table with respect to the base; and a platform having an instrument mounting bolt extending through an elongated slot for mounting of an instrument to the platform, the platform also including a linkage for coupling parallel upper and lower plates for elevational adjustment purposes.