Photonic crystal fiber based optical studies of oil deterioration by near field imaging

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• 作者：G. Latha ; ^{lathag@ssn.edu.in" class="auth_mail" title="E-mail the corresponding author} ; Prita Nair ^{pritanair@ssn.edu.in" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Photonic crystal fiber ; Silicone oil degradation ; Optical sensing
• 刊名：Optik - International Journal for Light and Electron Optics
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：127
• 期：22
• 页码：10991-10998
• 全文大小：1931 K

文摘

Mode pattern changes of LMA-20 solid core photonic crystal fiber, caused by change in refractive index of fluid infiltrated into its micro structured cladding has been theoretically modeled and experimentally verified through simple low cost near field CCD imaging of distal tip of infiltrated samples. This technique tracks degradation induced fractional changes in the oil index, over a large range from +30% to ⿿30% through the mode pattern changes associated with shifts from index guidance to multi-waveguide and band gap guidance. Simple estimation of fluid index by visual tracking of transmission band edges and quantification within transmission region through MFD changes extracted from recorded mode patterns are reported.