A spectroscopic sample holder comprises a microporous sheet. The microporous sheet has a top surface, a bottom surface substantially parallel to the top surface, and at least one side surface oriented substantially perpendicular to the top and bottom surfaces. The side surface forms an exposed transit...http://www.google.com.au/patents/US6983177?utm_source=gb-gplus-sharePatent US6983177 - Layered spectroscopic sample element with microporous membrane
