Electronic thermometer

US4861168A · kind A · utility

Assignee

• W. C. Heraeus GmbH · DE

Inventors

• Horst Ziegler · Berlin, DE
• Horst Behlen · Paderborn, DE

Key dates

• Filing date: Oct 25, 1988
• Grant date: Aug 29, 1989
• Expiry date: Oct 25, 2008

Classification

• Technology area (CPC G): Physics
• CPC primary: G01K7/32
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An electronic thermometer has an oscillator, the frequency determining element of which is a temperature sensitive piezoelectric element, used as a measuring sensor, which is located in a sealed housing of electrically insulating material. The piezoelectric element is provided with two terminal electrodes, which are each connected via a respective capacitor to the oscillator circuit, and each of the two capacitors has electrodes, one located inside and one located outside the housing.