Surface wave gas sensor

US5221871A · kind A · utility

Assignee

• BASF SE

Inventors

• Harald Fuchs · Eisenberg (Pfalz), DE
• Wolfgang Schrepp · Heidelberg, DE
• Michael Rapp · Seeheim-Jugenheim, DE
• Siegfried Hunklinger · Heidelberg, DE
• Manfred von Schickfus · Neckargemünd, DE

Key dates

• Filing date: Sep 24, 1991
• Grant date: Jun 22, 1993
• Expiry date: Sep 24, 2011

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N2291/0426
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A high-sensitivity surface wave gas sensor in which the interaction of a surface wave field with a solid film suitable for adsorbing the gas to be determined causes a change in the frequency of an oscillating circuit containing a surface wave delay line as a function of the type and concentration of the gas entails the delay line provided for adsorption of the gas being completely coated with the solid film, and the dimensions of the delay lines being such that the length of the surface wave transformer is greater than that of the delay line.