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Pinto, Jl
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Publications (6/6 displayed)
- 2018Optical Fiber Tip Sensor for the Measurement of Glucose Aqueous Solutionscitations
- 2018Glucose measurements with optical fiber sensor based on coreless silica fiber
- 2018Determination of thermo-optic coefficient of ethanol-water mixtures with optical fiber tip sensorcitations
- 2007Plated and intact femur strains in fracture fixation using fiber Bragg gratings and strain gaugescitations
- 2006Determination of setting expansion of dental materials using fibre optical sensingcitations
- 2003Characterization of Bragg Gratings in Normal and Reduced Diameter HiBi Fibers
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document
Determination of thermo-optic coefficient of ethanol-water mixtures with optical fiber tip sensor
Abstract
In this work, the thermo-optic coefficient (TOC) of ethanol-water mixtures, through refractive index and temperature measurements are determined using an etched optical fiber tip based on a multimode interferometer. The proposed probe is fabricated by fusion-splicing a 5.2 mm long coreless fiber section to a single mode fiber. To reduce the sensor dimensions and improve its sensitivity towards external medium variations, the fiber tip is subjected to wet chemical etching using a solution of 40% hydrofluoric acid, presenting a final diameter of 24.4 mu m. The TOC of each solution is estimated and, in the case of deionized water and pure ethanol, its value is of -1.128 x 10(-4) degrees C-1 and -3.117 x 10(-4) degrees C-1, respectively.