Centre National De La Recherche Scientifique

Cyril Caliot

François Henault

The invention relates to an apparatus for concentrating cosmic radiation originating from a celestial object, said apparatus comprising: a concentrating optical surface able to reflect incident cosmic radiation toward a target surface O'X&#x2032;Y&#x2032;, and liable to contain local surface errors and aiming and orientation errors; a system for inspecting the reflective optical surface; means for acquiring images of the optical surface from various viewpoints M&#x2032;(X&#x2032;, y&#x2032;) that are located on the target surface, m varying from 1 to M and n varying from 1 to N, so as to obtain M&#xd7;N images of the optical surface illuminated by the cosmic radiation, with M viewpoints along X&#x2032; and N viewpoints along Y&#x2032;, where M&#x3e;1, N&#x3e;1 and M&#xb7;N&#x2265;30; and a unit for processing the M&#xb7;N acquired images, which unit is suitable for: calculating the slopes &#x3b4;&#x394;(P)/&#x3b4;x and &#x3b4;&#x394;(P)/&#x3b4;y for each point P(x,y) of the reflective optical surface, where: L(M&#x2032;, P) being the luminance at a point of the image corresponding to the point P(x,y) of the reflective optical surface () observed from the viewpoint M&#x2032;, &#x3b5;the apparent angular radius of the celestial object and gand gpreset coefficients; and determining from these slopes &#x3b4;&#x394;(P)/&#x3b4;x and &#x3b4;&#x394;(P)/&#x3b4;y, a local surface error &#x394;P(x,y) at the point P(x,y) of the reflective optical surface ().

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Font Romeu, France

Cyril Caliot