Patent ID: 8727609
Filing Date: 2014-05-20
Classification: G01N

Abstract:
1. A method for thermal characterization of a portion of at least one first material of elongate shape on which there is arranged at least one portion of at least one second electrically conductive material of elongate shape, the method comprising: a) determining a characteristic R(T) of the portion of the second electrically conductive material corresponding to a variation in electrical resistance R of the portion of the second electrically conductive material as a function of temperature T of the portion of the second electrically conductive material; b) applying an electric current of angular frequency ω between ends of the portion of the second electrically conductive material and measuring 3 ωangular frequency harmonic of the electric voltage between these ends for different values of ω; c) calculating a coefficient of thermal conductivity of the portion of the first material from the values of the measured 3ω angular frequency harmonic and the characteristic R(T); a width of the portion of the first material being between about 0.9 L and 1.1 L, wherein L is the width of the portion of the second electrically conductive material, and wherein the portion of the first material is surrounded by at least one matter thermally insulating the portion of the first material, wherein the portions of the first and second material are prepared by implementing: depositing a layer composed of the first material on a substrate; depositing a layer composed of the second electrically conductive material on the layer composed of the first material; forming an etching mask having a pattern of elongate shape; photolithography and etching the layers composed of the first and second materials according to the pattern of the etching mask, forming the portion of the first material and the portion of the second electrically conductive material; removing the mask.