Patent ID: 6651484
Filing Date: 2003-11-25
Classification: G01N

Abstract:
A device for measuring the specific density of a gaseous or liquid medium, the device comprising:an acoustic transducer that is active on both of two sides, said acoustic transducer being operable to emit and receive acoustic signals; at least two substantially cylindrical acoustic delay paths, each having a respective known acoustic impedance, wherein a first of said delay paths is arranged on one of the two sides of the acoustic transducer and on its base, facing away from the acoustic transducer, the first delay path has a first boundary surface to the medium to be measured, and wherein a second of said delay paths is arranged on the other of the two sides of the acoustic transducer and on its base, facing away from the acoustic transducer, the second delay path has a second boundary surface to a reference medium; and a substantially hollow cylindrical ring; wherein the acoustic transducer has a smaller diameter than the bases of the delay paths and the acoustic transducer is inserted into the substantially hollow cylindrical ring, an inside diameter of which is adapted to an outside diameter of the acoustic transducer and an outside diameter of which is adapted to the diameter of the bases of the delay paths.