Patent · US Expired

Transducer with a piezoelectric sensor element

US4441044A · kind A · utility

13Cited by

13References

8Claims

0Family size

Assignee

Hans List · AT

Inventors

Friedrich Ruckenbauer · Graz, AT
Peter Claassen · Ludwigshafen, DE
Peter W. Krempl · Leibnitz, AT

Key dates

Filing date	May 14, 1982
Grant date	Apr 3, 1984
Priority date	—
Expiry date	May 14, 2002

Classification

Technology area (CPC G)Physics
CPC primaryG01L23/10
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

In addition to having at least one piezoelectric sensor element, a transducer is provided with at least one further measuring element, which is influenced by the state variable to be measured in the same way as the piezoelectric sensor element, and has its own signal lead. The additional measuring element may also be a piezoelectric element which may be excited so as to produce mechanical vibrations by utilizing the inverse piezo-effect, the change of the vibration characteristics of the vibration system consisting of the excited piezo-element and its environment serving as a measurement value for a static or quasi-static measurement.

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