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Optical Nondestructive Method for Dynamic Monitoring of Chemical Reactions

IP.com Disclosure Number: IPCOM000045305D
Original Publication Date: 1983-Mar-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Gugger, H: AUTHOR [+3]

Abstract

By placing a reactive film (e.g., a polymeric film) or a nonreactive film with a reactant upon the surface or adjacent to a prism or grating coated with silver, gold (about 500 Angstroms thick) or other highly reflecting metal (aluminum or copper) with or without a protective coating, the waveguide modes can be monitored as a function of chemical reaction caused or influenced by heat, light, charge, current (electrochemical), electric field, and/or diffusion of reagent. As a chemical reaction, e.g., polymerization, curing, hardening, loss of solvent, cross-linking, decomposing, or degrading proceeds, changes in thickness, refractive index, including an anisotropy in the index between in-plane and perpendicular to the plane, and absorption, can be process monitored in a nondestructive way.

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Optical Nondestructive Method for Dynamic Monitoring of Chemical Reactions

By placing a reactive film (e.g., a polymeric film) or a nonreactive film with a reactant upon the surface or adjacent to a prism or grating coated with silver, gold (about 500 Angstroms thick) or other highly reflecting metal (aluminum or copper) with or without a protective coating, the waveguide modes can be monitored as a function of chemical reaction caused or influenced by heat, light, charge, current (electrochemical), electric field, and/or diffusion of reagent. As a chemical reaction, e.g., polymerization, curing, hardening, loss of solvent, cross- linking, decomposing, or degrading proceeds, changes in thickness, refractive index, including an anisotropy in the index between in-plane and perpendicular to the plane, and absorption, can be process monitored in a nondestructive way. A number of configurations are possible for this process monitoring.

Referring to the figure, the reactive index of the contents of vessel (C) can be monitored by introducing monochromatic light from source (A) into prism (D) which can be, for example, a semicircular prism. The light interacts with the layer
(B), which can be a thin film of gold silver or copper (for observation of surface plasmons) or it can be a portion of the contents of the vessel, i.e., a dielectric material (for examining guided light modes). The detector (D) is moved synchronously with the position of source (A) to examine the out...