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Article
Novel Optical Fiber Sensor Based on SGMS Fiber Structure for Measuring Refractive Index of Liquids and Gases

Author: J.K. Hmood
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2011 Volume: 7 Issue: 4 Pages: 17-21
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

In this paper a single mode-gap-multimode-single mode fiber structure (SGMS) as refractive index sensor is demonstrated. A beam propagation method (BPM) for the circular symmetry waveguide is employed for numerical simulations of the light propagation performance in such fiber devices. The multimode interference effect is revealed to design optical fiber sensor with reasonable linearity in wide range of refractive indices. A simple way to predict and analyze the spectral response of the SGMS structure is presented with the derived approximated formulations. The proposed sensor is realized by using standard optical fibers.Results indicate that the proposed SGMS structure can be exploited for measuring a broad refractive index range with reasonable high resolution. The results achieved for refractive indices in the range of 1.1 to 1.43 have best linearity with correlation coefficient 0.9991 at wavelength of 1550 nm. Therefore, it can be suggested that the SGMS structure fibers are attractive for measuring refractive index of both gases and aqueous solutions such as chemical liquids, biological, and biochemical sensing.


Article
Fiber Optic Sensor for Measuring Rotation

Authors: S.M.Al-Hilly --- Z. E. Khaleel --- A.F.Alrubaye
Journal: Al-Nahrain Journal of Science مجلة النهرين للعلوم ISSN: (print)26635453,(online)26635461 Year: 2011 Volume: 14 Issue: 4 Pages: 66-72
Publisher: Al-Nahrain University جامعة النهرين

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Abstract

The effect of the angular velocity on the interference pattern of Mach-Zehnder interferometer by using Sagnac effect had been investigated in this study.This interference pattern was produced from the interference of the two laser beams propagated through the two arms of the interferometer.The two arms consist of optical fiber wounded in circular shape. Each laser beam propagates in opposite direction to the other. When the system was rotated, a time difference between these two laser beams was produced.Different angular velocities (1.5°/sec,3°/sec,4.5°/sec, and 6°/sec ),different diameters of turns (0.22m,0.4m,0.6m,and 0.75m) and different lengths of optical fiber (2.8m,12.8m) were used to study the effect of each on the number of fringes .It has been found that any increase in each of the angular velocity, length of optical fiber and diameter of turns leads to an increase of the number of fringes.

تم دراسة تا ثير الدوران حسب مبدأ (Sagnac) على نمـط التداخـل الناتـج من استخـدام مقيـاس (Mach-Zehnder) للتداخل.ان نمط التداخل ناتج من تراكب حزمتين ليزريتين ناتجتين من انقسام الحزمة الاصلية ومرور كل قسم في احد اذرع المقياس والذي هو عبارة عن ليف بصري لف بشكل دائري وتنتقل كل حزمة باتجاه يعاكس انتقا ل الحز مة الاخرى عند دوران المنظومة. يتولد اختلاف في زمن الانتقال بين الحزمتين المتعاكستين وبالتالي ينتج فرق مسار بصري يؤدي الى ازاحة الاهداب في نمط التداخل المتكون.تم دراسة تاثير السرع الدورانية التالية (1.5درجة/ثا،3 درجة/ثا، 4.5 درجة/ثا، 6 درجة/ثا) على عدد الاهداب المزاحة؛ حيث وجد انه يزداد عدد الاهداب المزاحة بزيادة السرعة الدورانية. ولقد تم ايضا دراسة تاثير اختلاف طول الليف البصري (2.8م ،12.8م) وقطر لفة الذراع لمقياس التداخل (0.22م،0.4م،0.6م،0.75م) على عدد الاهداب المزاحة، وقد وجد انه عدد الاهداب المزاحة يزداد بزيادة كل من الطول والقطر.

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