The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 12, 2008
Filed:
Sep. 20, 2004
Manfred Eckert, Todtnau, DE;
Frank Volz, Freiburg, DE;
Manfred Eckert, Todtnau, DE;
Frank Volz, Freiburg, DE;
Endress + Hauser GmbH + Co. KG, Maulburg, DE;
Abstract
A sonic or ultrasonic transducer, which is embodied as a radial oscillator. So that the sonic or ultrasonic transducer can be used at high temperatures, a matching layer is located between the radial oscillator and the atmosphere into which the ultrasonic signals are transmitted The matching layer is made from a material that has a dimensional stability up to a temperature which lies above the temperature at the installation location of the sonic or ultrasonic transducer. Furthermore, the matching layer is selected such that its material-specific coefficient of thermal expansion is greater than that of the materials of a piezoelectric unit and a coupling ring, and that the modulus of elasticity of the material of the matching layer is at least one order of magnitude smaller than that of the piezoelectric unit and/or the coupling ring.