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Title: Adsorption of water on porous Vycor glass studied by ellipsometry
Authors: Álvarez Herrero, A.
López Heredero, R.
Bernabeu, E.
Levy, D.
Keywords: Sensors;Optical;Effective;Systems Design
Issue Date: 1-Feb-2001
Publisher: OSA (The Optical Society) Publishing
DOI: 10.1364/AO.40.000527
Published version:
Citation: Applied Optics 40(4): 527-532(2001)
Abstract: The variation of the optical properties of porous Vycor glass (Corning, Model 7930) under different relative-humidity conditions was studied. The adsorption of water into the glass pores was investigated with spectroscopic ellipsometry. The change of the refractive index was Δn ∼ 0.04 between 5% and 90% relative humidity. A linear relation between the ellipsometer parameter tan Ψ, the amount of water adsorbed in the glass pores, and information about the pore-size distributions was established. The results are in accord with the values obtained from N2 isotherms, transmission electron microscope micrographs, and the manufacturer’s specifications (radius of ∼20 Å). The possibility of using this material as a transducer for implementation in a fiber-optic sensor to measure humidity was evaluated.
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E-ISSN: 2155-3165
ISSN: 1559-128X
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