Patent ID: 7883902

Claim:
Method of dispersing a sample of dry powder on a surface in a dispersion chamber, comprising the steps of: sealingly closing said dispersion chamber, placing the sample in means of introducing dry powder into the dispersion chamber, putting the chamber under negative pressure with respect to a surrounding environment, exploding a membrane that ruptures, this membrane serving as the above mentioned introduction means and being interposed between said surrounding environment and the interior of said dispersion chamber, the rupture of the membrane causing an opening in the dispersion chamber and an entry of a fluid composing the surrounding environment through the ruptured membrane, entrainment by this fluid of the dry powder placed on the membrane, inside the dispersion chamber in an evenly dispersed manner, and dispersing the dry powder on said surface, which is disposed on a bottom of the chamber and separate from the bottom of the chamber, said dispersion being carried out by separating and setting in movement of the sample of dry powder without producing an ordered movement of powder grains in the dispersion chamber; and analyzing the dry powder sample.