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15 September 2016High resolution measurement of water levels in optical components
Fabian N. Murrieta-Rico,1 Vitalii Petranovskii,2 Oleg Sergiyenko,3 Daniel Hernandez-Balbuena,3 Oscar Raymond-Herrera2
1Ctr. de Investigación Científica y de Educación Superior de Ensenada B.C. (Mexico) 2Univ. Nacional Autónoma de México (Mexico) 3Univ. Autónoma de Baja California (Mexico)
Systems for optical analysis use vacuum chambers, where low pressures are reached. Remaining water molecules are the prevalent contaminant in high vacuum chambers. For this reason measurement of water levels is an important task that allows correct equipment operation. In this work, a different approach is presented for detecting and quantifying the water molecules inside a the vacuum chamber used in optical systems. A zeolite coated quartz crystal microbalance is used for detecting the water molecules, and the change in the resonance frequency is measured using a novel technique known as the principle of rational approximations. Theoretical results show how nanograms of adsorbed molecules are measured, and the number of molecules are quantified.
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Fabian N. Murrieta-Rico, Vitalii Petranovskii, Oleg Sergiyenko, Daniel Hernandez-Balbuena, Oscar Raymond-Herrera, "High resolution measurement of water levels in optical components," Proc. SPIE 9927, Nanoengineering: Fabrication, Properties, Optics, and Devices XIII, 99271K (15 September 2016); https://doi.org/10.1117/12.2238849