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Vol. 27, Special Issue, May 2014, pp. 244-252




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

1 Vlastimil MATĚJEC, 1 Ivo BARTOŇ, 1 Jan MRÁZEK, 1 Ondřej PODRAZKÝ

1 Institute of Photonics and Electronics AS CR, v.v.i., Chaberska 57, 182 51 Prague 8, Czech Republic
Tel.: +420 266 773 511, fax: +420 284 688 220

E-mail: matejec@ufe.cz


Received: 23 November 2013 /Accepted: 12 January 2014 /Published: 26 May 2014

Digital Sensors and Sensor Sysstems


Abstract: 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.


Keywords: Toluene detection, Photocatalytic decomposition, U-Shaped fiber, Polysiloxane membrane, Inclined collimated beam.


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