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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Editor: Franco Gori
  • Vol. 31, Iss. 5 — May. 1, 2014
  • pp: 1023–1030

Examination of tapered plastic multimode fiber-based sensor performance with silver coating for different concentrations of calcium hypochlorite by soft computing methodologies—a comparative study

Rozalina Zakaria, Ong Yong Sheng, Kam Wern, Shahaboddin Shamshirband, Ainuddin Wahid Abdul Wahab, Dalibor Petković, and Hadi Saboohi  »View Author Affiliations


JOSA A, Vol. 31, Issue 5, pp. 1023-1030 (2014)
http://dx.doi.org/10.1364/JOSAA.31.001023


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Abstract

A soft methodology study has been applied on tapered plastic multimode sensors. This study basically used tapered plastic multimode fiber [polymethyl methacrylate (PMMA)] optics as a sensor. The tapered PMMA fiber was fabricated using an etching method involving deionized water and acetone to achieve a waist diameter and length of 0.45 and 10 mm, respectively. In addition, a tapered PMMA probe, which was coated by silver film, was fabricated and demonstrated using a calcium hypochlorite (G70) solution. The working mechanism of such a device is based on the observation increment in the transmission of the sensor that is immersed in solutions at high concentrations. As the concentration was varied from 0 to 6 ppm, the output voltage of the sensor increased linearly. The silver film coating increased the sensitivity of the proposed sensor because of the effective cladding refractive index, which increases with the coating and thus allows more light to be transmitted from the tapered fiber. In this study, the polynomial and radial basis function (RBF) were applied as the kernel function of the support vector regression (SVR) to estimate and predict the output voltage response of the sensors with and without silver film according to experimental tests. Instead of minimizing the observed training error, SVR_poly and SVR_rbf were used in an attempt to minimize the generalization error bound so as to achieve generalized performance. An adaptive neuro-fuzzy interference system (ANFIS) approach was also investigated for comparison. The experimental results showed that improvements in the predictive accuracy and capacity for generalization can be achieved by the SVR_poly approach in comparison to the SVR_rbf methodology. The same testing errors were found for the SVR_poly approach and the ANFIS approach.

© 2014 Optical Society of America

OCIS Codes
(060.2310) Fiber optics and optical communications : Fiber optics
(060.2370) Fiber optics and optical communications : Fiber optics sensors

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: February 6, 2014
Revised Manuscript: February 14, 2014
Manuscript Accepted: February 24, 2014
Published: April 11, 2014

Citation
Rozalina Zakaria, Ong Yong Sheng, Kam Wern, Shahaboddin Shamshirband, Ainuddin Wahid Abdul Wahab, Dalibor Petković, and Hadi Saboohi, "Examination of tapered plastic multimode fiber-based sensor performance with silver coating for different concentrations of calcium hypochlorite by soft computing methodologies—a comparative study," J. Opt. Soc. Am. A 31, 1023-1030 (2014)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-31-5-1023


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