Patent · US Expired

Sonic or ultrasonic transducer

US7411335B2 · kind B2 · utility

3Cited by

4References

8Claims

0Family size

Assignee

ENDRESS+HAUSER GMBH+CO.KG · DE

Inventors

Manfred Eckert · Lauchringen, DE
Frank Volz · Freiburg (Elbe), DE

Key dates

Filing date	Sep 20, 2004
Grant date	Aug 12, 2008
Priority date	—
Expiry date	Sep 24, 2024

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB06B1/0662
WIPO fieldChemical engineering
WIPO sectorChemistry

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.