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16 November 2004 pH sensor based on sol-gel silica layer deposited on a plastic optical fiber with blue bromophenol
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Design and characterization of a pH optical fiber sensor with a pH sensitive dye is described in this paper. TEOS (Tetra-ethyl-Orto-Silicate) was used to dope a plastic optical fiber, which will be used as the probe. The sensor is prepared by fixing the doped plastic fiber on a fused ortosilica block surface with blue bromophenol. The fiber surface charged with silica and the refractive index, which plays an important roll on the fiber, modifies the conditions of light propagation into the plastic optical fiber. The fiber transmittance is used to measure the pH of a solution or a fluid in a range between 7 and 10.5. Such signal is captured by a photodetector and processed with a LabView development environment which also controls a hardware designed in our laboratory. The advantage of this system is that 2cm of doped fiber are enough to measure the pH of a fluid in real time. The response time of this system is approximately 10s.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Edgar Alvarado-Méndez, Daniel Hernández-Cruz, Roberto Rojas-Laguna, Jose Amparo Andrade-Lucio, Julian M. Estudillo-Ayala, M. Trejo-Durán, Oscar G. Ibarra-Manzano, J. Erasmo Ponce-Ballesteros, and Roger A. Lessard "pH sensor based on sol-gel silica layer deposited on a plastic optical fiber with blue bromophenol", Proc. SPIE 5579, Photonics North 2004: Photonic Applications in Telecommunications, Sensors, Software, and Lasers, (16 November 2004);

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