Figure 15.Schematic depiction of the self-enooded bead arrays concept.A mixture of sensor beads is prepared by combining aliquots from three stock solutions,each con- taining a different type of polymer/dye sensor suspended in a Nanopure water/0.01%Tween solution.A drop of the final mixture is then placed onto the distal tip of an etched imaging fiber.After they have settled in random locations throughout the well array.the beads are identified and categorized by their characteristic responses to a test vapor pulse,without the need for any additional encoding schemes. Reprinted from ref 154.Copyright 1999 American Chemical Society