Patent ID: 7106439

Claim:
Elementary analysis device by optical emission spectrometry on laser produced plasma, the device comprising: a pulsed laser source; a diaphragm having an aperture of a fixed diameter for selecting part of a laser beam emitted by said pulsed laser source on an object to be analysed, said laser beam not being focused in the plane of said diaphragm, first optical means projecting the image of the diaphragm to infinity, second optical means receiving the image of said diaphragm projected to infinity by said first optical means and focusing it on said object to be analysed to produce plasma on the surface of, said object, wherein the image of said diaphragm focused on said object is equal to a required dimension on said object, said required dimension corresponding to a required spatial resolution; and the focal point of said laser beam, after crossing through said diaphragm and said first and second optical means, is outside the image plane of the diaphragm; means for analyzing a light radiation spectrum emitted by the plasma, said means for analyzing disposed adjacent to the plasma; means for determining the elementary composition of said object from the means for analyzing a light radiation spectrum; and means for displacing said object within a plane after each pulse of said laser source.