U-Shaped Fiber-Optic Detection Elements for Investigation of Photocatalytic Decomposition of Toluene Dissolved in Water

0443689 - ÚFE 2016 RIV FR eng J - Journal Article
Matějec, Vlastimil - Bartoň, Ivo - Mrázek, Jan - Podrazký, Ondřej
U-Shaped Fiber-Optic Detection Elements for Investigation of Photocatalytic Decomposition of Toluene Dissolved in Water.
Sensors and Transducers. Roč. 27, May (2014), s. 244-252. ISSN 2306-8515
R&D Projects: GA ČR GAP102/12/2361
Institutional support: RVO:67985882
Keywords : Toluene detection * Photocatalytic decomposition * U-Shaped fiber
Subject RIV: JA - Electronics ; Optoelectronics, Electrical Engineering

Several fiber-optic sensing elements consisting of a U-shaped fiber coated by a detection membrane of polydimethylsiloxane have been prepared with arc radii from 0.3 to 2 mm. Angular distributions of the output optical power from the elements have been measured. A high decrease of the transmitted power of paraxial rays has been observed for elements with arc radii below 1 mm. When elements with arc radii above 1 mm were excited by an inclined collimated beam and brought into contact with toluene solutions a maximum sensitivity of 1 dB/mM was determined. Sensing elements have been tested for monitoring the decomposition of toluene dissolved in water by means of photocatalytic TiO2 nanoparticles applied on silica optical fibers. Differences between concentration data obtained by UV spectrophotometry and those obtained by the element on levels of 10-15% have been observed
Permanent Link: http://hdl.handle.net/11104/0246377