Patent ID: 9140659
Filing Date: 2015-09-22
Classification: G01N

Abstract:
1. A sensor for determining the concentration of a gas in a two-component mixture at variable pressure, comprising: a measurement cell located in the two-component mixture, comprising a membrane of low thermal inertia, on which heating means for said membrane and measuring means that supplies a signal representative of the temperature T a source of alternating current of a predetermined frequency f for supplying said heating means and an electronic circuit, wherein said predetermined frequency f enables the heating means to heat and alternately allow said membrane to be cooled so that its temperature T wherein the electronic circuit processes said signal to extract therefrom a first and a second parameter respectively relating to said first stable value and to the transient mode, and calculates a value of the concentration of said gas and of the pressure of said two-component mixture from these parameters with the assistance of a previously established mathematical function and characteristic coefficients of said sensor, said first parameter being representative of said high stable temperature T