A Comparative Analysis of Two Refractive Index Sensors Based On Fiber-Optic Evanescent Field Wave |
Author(s): |
Prasenjit Paul , Tezpur University |
Keywords: |
Evanescent Field, Optical Fiber, Refractive Index Sensor |
Abstract |
This work presents a comparative study of evanescent field wave based fiber-optic liquid concentration sensors of two different configurations. The two different set-up being proposed here has the potential to detect concentration changes in a liquid to a good degree of precision.. Important characteristics of the proposed sensors are that they utilize inexpensive materials like multimode plastic optical fiber and are applicable for various solutions at normal temperatures. The amount of rays guided along the fiber probe is a result of the absorption of evanescent waves being produced at the core-cladding interface. A millivolt range multimeter displays voltage output which is an indicator of the refractive index of a certain concentration of a solution. The two separate set-up measures light intensities across unclad portion of a plastic clad silica optical fiber, where salt solutions of known concentrations serve as cladding regions. According to results, the sensitivity of the direct transmission mode is 1.23 and that of the reflection mode is 11.00 which follows that the reflection configuration mode is more sensitive than the other. |
Other Details |
Paper ID: IJSRDV3I41184 Published in: Volume : 3, Issue : 4 Publication Date: 01/07/2015 Page(s): 3047-3049 |
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