Piezoelectric measuring element for measuring mechanical variables

US5557968A · kind A · utility

Assignee

• Avl Gesellschaft fur Verbrennungskraftmaschinen und Messtechnik m.b.H. Prof.Dr.Dr.h.c. Hans List · AT

Inventors

• Peter W. Krempl · Leibnitz, AT
• Roland Selic · Graz, AT

Key dates

• Filing date: Feb 23, 1995
• Grant date: Sep 24, 1996
• Expiry date: Feb 23, 2015

Classification

• Technology area (CPC G): Physics
• CPC primary: G01L23/10
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

To improve temperature compensation of a piezoelectric element measuring mechanical variables, such as pressure, force, and acceleration, with two or more piezoelectric crystal elements, at least one of the crystal elements differ from the other crystal element(s) either physically or chemically, the positive temperature coefficient of a piezo-coefficient of at least one piezoelectric crystal element compensating the negative temperature coefficient of the other crystal element(s), so that the overall piezoelectric sensitivity of the measuring element will remain essentially constant within a given temperature interval.