Electroacoustic transducer for use at high temperatures and pressures

Claim 1

An electroacoustic transducer for operating at temperatures exceeding the temperature of boiling water, said transducer comprising a unitary housing structure of stainless steel having a cylindrical tubular wall section with an opening surrounded by threads at one end and a closed bottom at the other end with no open joints therebetween, an axial hole inside the end of said closed bottom, means comprising a cylindrical tubular transducer element for converting alternating electrical signals into mechanical vibrations, means comprising a cylindrical core support member having an outer diameter which fits loosely inside said cylindrical transducer element, positioning means comprising a pin-like extension tip on said core member fitting into said axial hole for locating said support member with its axis in alignment with the axis of said cylindrical tubular wall section of said housing member, spacer means for locating said cylindrical tubular transducer element in concentric relationship over the cylindrical support member, electrical conductor means connected to said transducer element, and sound conducting coupling means filling the space between the vibratile cylindrical surface of said transducer element and the surrounding surface of said tubular wall section of said housing structure.