Sapphire Fiber Evanescent Wave Absorption in Turbid Media

Authors: Zhang, Jian1; Xiong, Feibing2; Djeu, Nicholas2

Source: Applied Spectroscopy, Volume 63, Issue 8, Pages 184A-214A and 859-978, (August 2009) , pp. 932-935(4)

Publisher: Society for Applied Spectroscopy

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Abstract:

The influence of particulates on sapphire fiber evanescent wave absorption by water has been studied. Suspensions containing micro-sized graphite flakes and glassy carbon powder were used. Conventional free-space transmittance measurements of these samples showed strong absorption and scattering, which severely screened the absorption by water. However, the absorption on the water band determined from the evanescent wave interaction was unaffected by the presence of the graphite flakes. These results indicate that fiber-optic evanescent wave chemical sensors may be suitable for process control applications involving turbid reactor streams.

Keywords: EVANESCENT WAVE SPECTROSCOPY; FIBER-OPTIC SENSING; PARTICULATES INFLUENCE

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370209788964485

Affiliations: 1: MicroMaterials, Inc., Tampa, Florida 33637 2: University of South Florida, Tampa, Florida 33620

Publication date: August 1, 2009

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