A Numerical Analysis of Various pH Level for Fiber Optic pH Sensor Based on Bromophenol Blue in Silica

The fabrication and characterization of an optical fiber pH sensor for the detection range 2 – 7 are described. The sensing element was prepared by coating the uncladded middle portion of a multimode plastic clad silica fiber (PCF) with xerogel film of immobilized bromophenol blue (BPB) prepared by a sol-gel process. The exponential decay of the evanescent wave at the core-cladding interface of the multimode fiber was utilized to determine the pH response.  The objective of this work is to analyze the measurement of the fiber optic sensing probe towards various pH level. The intensity of the absorbance was analyzed using statistical technique (Statistical Package for the Social Sciences, SPSS) to identify the significant pH range that can be used as a reference in developing the sensor instrumentation in the future. pH2 shows the highest significance among all pH values based on the statistical results using error plots.

[1]  S. Naseem,et al.  Structural and dielectric properties of boron-doped and un-doped mullite thin films , 2015, Journal of Sol-Gel Science and Technology.

[2]  S. Naseem,et al.  Synthesis and characterization of multilayered sol–gel based plastic-clad fiber optic pH sensor , 2015 .

[3]  S. Pasche,et al.  Development of a polymer optical fiber pH sensor for on-body monitoring application , 2014 .

[4]  Francisco J. Arregui,et al.  A Fiber Optic Ammonia Sensor Using a Universal pH Indicator , 2014, Sensors.

[5]  Ivana Murković Steinberg,et al.  Hybrid sol–gel thin films doped with a pH indicator: effect of organic modification on optical pH response and film surface hydrophilicity , 2014, Journal of Sol-Gel Science and Technology.

[6]  S. Naseem,et al.  Preparation and characterization of crack-free sol–gel based SiO2–TiO2 hybrid nanoparticle film , 2013, Journal of Sol-Gel Science and Technology.

[7]  Yi Xin,et al.  Sol-gel fiber-optic absorbance sensor for groundwater contaminants , 2013, The 8th Annual IEEE International Conference on Nano/Micro Engineered and Molecular Systems.

[8]  Zhengtian Gu,et al.  Absorption-type optical pH sensitive film based on immobilized purple cabbage pigment , 2013 .

[9]  Francesco Pilati,et al.  Plastic Optical Fiber pH Sensor Using a Sol-Gel Sensing Matrix , 2012 .

[10]  Kiran Kumar Annamdas,et al.  Review on developments in fiber optical sensors and applications , 2010, Defense + Commercial Sensing.

[11]  F. Henari,et al.  The Influence of pH on Nonlinear Refractive Index of Bromophenol Blue , 2010 .

[12]  H. Ju,et al.  Preparation of ormosil and its applications in the immobilizing biomolecules , 2006 .

[13]  Colette McDonagh,et al.  Leaching in sol–gel-derived silica films for optical pH sensing , 1998 .

[14]  B. MacCraith,et al.  Optimisation of sol-gel-derived silica films for optical oxygen sensing , 1997 .

[15]  W. Hager,et al.  and s , 2019, Shallow Water Hydraulics.

[16]  A. Balaji Ganesh,et al.  Sol–gel based portable optical sensor for simultaneous and minimal invasive measurement of pH and dissolved oxygen , 2015 .

[17]  A. Selvarajan,et al.  Fiber optic sensors and their applications , 2012 .

[18]  B. MacCraith,et al.  Optimisation of Sol-Gel-Derived Silica Films for Optical Oxygen Sensing , 1997 .