Marangoni-effect-induced interface deformations in a diphasic system - Application to IR/visible image conversion

The response of one-layer and two-layer fluid systems to spatially periodic thermal perturbations is investigated theoretically and experimentally, and an IR/visible image converter based on the principle is described. The hydrodynamic equations of perfect and viscous fluids are reviewed; the surface response to Marangoni and Archimedes forces is analyzed; the relevant physicochemical properties of the binary mixture bromonaphthalene + Si-200 oil and the ternary mixture bromonaphthalene + Si-200 oil/0.65 iodonaphthalene are determined; and the optical response of the binary system to an IR image is demonstrated. The results of transmission and evaporographic experiments and the design of a prototype image converter (Loulerge et al., 1983; the U.S. patent, number 4,275,302, is included in an appendix) are presented and illustrated with diagrams, drawings, graphs, and sample images.