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The theoretical study of an optimal distributed fiber moisture sensor based on the periodic polymer coating
, Article Iranian Journal of Science and Technology, Transaction A: Science ; Volume 45, Issue 3 , 2021 , Pages 1097-1104 ; 10286276 (ISSN) ; Dehghani Sanij, M ; Rooholamininejad, H ; Bahrampour, A ; Sharif University of Technology
Springer Science and Business Media Deutschland GmbH
2021
Abstract
In our previous works, we presented a theoretical approach to describe the behavior of a single-mode step-index optical fiber or polymer optical fiber such as poly (methyl methacrylate) or PMMA fiber coated by moisture-sensitive polymers (MSPs) and moisture-insensitive polymers periodically. The periodic structure is surrounded by a high young's modulus material such as stainless steel mesh. Absorption of the moisture by the MSPs causes to deform the optical fiber, such that the optical fiber gratings are induced. Induced fiber gratings are the basis of the proposed relative moisture sensor. Due to the low Young's modulus of polymers, the polymer fiber sensors are more sensitive relative to...