Design of thin-film filters for the monitoring of chemical reactions

Jerzy A. Dobrowolski; Pierre G. Verly; Michael L. Myrick; Matthew P. Nelson; Jeffrey F. Aust

doi:10.1117/12.290200

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1 October 1997 Design of thin-film filters for the monitoring of chemical reactions

Jerzy A. Dobrowolski; Pierre G. Verly; Michael L. Myrick; Matthew P. Nelson; Jeffrey F. Aust

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Proceedings Volume 3133, Optical Thin Films V: New Developments; (1997) https://doi.org/10.1117/12.290200
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

A new optical computation method for the monitoring of chemical reactions requires filters with spectral transmittance curves that vary in a complicated way with wavelength. In this paper we consider the design of two different sets of filters, one of which could be used to predict the degree of curing of a polymer from an analysis of its Raman spectra. The problem is not easy because the required filters have sharp spectral features in a narrow spectral region. Two different design methods are used. The performance of one set designed by conventional means is very close to the specifications. However, current thin film deposition methods are probably incapable of producing filters of such thickness. The second solution is based on the use of several filters placed in series. It should be possible to implement this particular solution, but its performance is not nearly as good. Nevertheless, calculations indicate that this filter pair should also result in a satisfactory control of the curing process.

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Jerzy A. Dobrowolski, Pierre G. Verly, Michael L. Myrick, Matthew P. Nelson, and Jeffrey F. Aust "Design of thin-film filters for the monitoring of chemical reactions", Proc. SPIE 3133, Optical Thin Films V: New Developments, (1 October 1997); https://doi.org/10.1117/12.290200

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