Abstract: A flexcompressional acoustic transducer is set forth. In the preferred and illustrated embodiment, multiple parallel magnetostrictive rods provided with coils are coupled through a plate affixed to a radiating element. The radiating element in one embodiment is an elongate hollow cylinder which is closed at both ends. Vibrations from the magnetostrictive members cause the cylinder to radially flex, creating an omnidirectional acoustic wave transmitted radially outwardly, the apparatus being positioned in a sonde for connecting an acoustic wave front through the wall of the sonde for transmission into the surrounding wellbore fluids and the adjacent formations.

Abstract: In the preferred and illustrated embodiment salinity measuring apparatus is disclosed. An elongate sonde has a housing with an internal chamber. The chamber is perforated by opening to the exterior to introduce well fluid. Transverse plates define the chamber and mount the acoustic transducer which sends an acoustic pulse along the chamber. An acoustic transceiver is coupled to a timer circuit which determines changes in transit time as a function of salinity compared to pure water.