Patent ID: 8731852

Claim:
A method for an evaluative analysis of a photovoltaic layer system, comprising the following steps: generating an electric current in a layer system; generating a spatially resolved image of a thermal radiation of a surface of the layer system, wherein the spatially resolved image has a multiplicity of pixels, each pixel of which is assigned an intensity value corresponding to a surface temperature of a point on the surface related to said pixel; ascertaining an intensity distribution of the thermal radiation relative to a respective number of pixels with a same intensity value; ascertaining an intensity mean/median from the intensity distribution; ascertaining an intensity interval on a basis of a specifiable measure for a scattering of the intensity distribution; ascertaining a characteristic number by addition of products, resulting in each case from the respective number of pixels with the same intensity value multiplied by the intensity value, for all intensity values above the intensity mean/median increased by the intensity interval; and comparing the characteristic number or a calculation value based thereon with a specifiable reference characteristic number, wherein the layer system is assigned a first evaluation result if the characteristic number is greater than or equal to the specifiable reference characteristic number, or is assigned a second evaluation result if the characteristic number is less than the specifiable reference characteristic number.