Patent ID: 6862917
Filing Date: 2005-03-08
Classification: G01N

Abstract:
1. An apparatus for detecting agents comprising: a solid body having a first surface area and a second surface area; a first coating superimposed on the first surface area of the solid body, and a second coating superimposed on the second surface area of the solid body, wherein said first coating and second coating are different materials; a wave propagating transducer adjacent the solid body to propagate an input wave front adjacent the first surface area of the solid body and the second surface area of the solid body and thereby result in a first output wavefront adjacent the first surface area of the solid body and a second output wavefront adjacent the second surface area of the solid body, wherein said first output wave front and said second output wave front interfere to produce an interference pattern; and a wave receiving transducer means for recording the interference pattern produced by said first output wave front and second output wave front; wherein the first coating and the second coating each adsorb different agents at different rates, and the first coating adsorbs a first agent at a first rate and a second agent at a second rate, and said first and second rates are different from each other, and the second coating adsorbs the first agent at a third rate and the second agent at a fourth rate, and said third and fourth rates are different from each other.