Patent ID: 6653613
Filing Date: 2003-11-25
Classification: G01J,G02B

Abstract:
Method for measuring a given number (m) of shape parameters (ai) of a surface of an optical wavefront of given support, the shape parameters being the coefficients of a break-down of the phase (&PHgr;) of the wavefront on a base of orthogonal polynomials (Pi) on said support, characterised in that it comprises:incidence on linear detection means of at least two spatially separate lines belonging to said incident wavefront surface, said at least two lines having an intersection point belonging to the wavefront surface to establish the origin of the phase of said wavefront surface, acquisition of said at least two incident wave lines (Li) comprising for each said incident wave line (Li): optical detection comprising the collection of linear portions of said line by a linear array of optical systems, the focusing by each optical system of one of said linear portions into a light spot, and the optical detection of the light spot positions by linear detector means delivering an electrical signal characterising said incident wave line; the processing (TS) of said electrical signal to determine a set Ki of parameters kij proportional to the values of the phase of the wavefront, or of an nth derivative of said phase, the reconstruction (REC) of said wavefront surface comprising the calculation of the said shape parameters (ai) of the wavefront surface from the sets Ki determined for each said at least two incident wave lines (Li).