An apparatus and method for detecting the presence and measuring the concentrations of molecules through a barrier and/or at a distance utilizes the principle of chemical/electrostatic attraction (hereinafter “affinity”), i.e., the affinity between charged atoms and molecules that cause their chemical...http://www.google.com/patents/US7595170?utm_source=gb-gplus-sharePatent US7595170 - Apparatus and method for measuring concentrations of molecules through a barrier
