MMI Sensor for Diameter Measurement

Cylindrical structure analysis is important in several areas and can be performed through the evaluation of diameter changes these structures. Two mentioned: pipelines for oil or gas distribution condition growth trees. In tree changes, monitoring directly related to irrigation, since it depends on water soil deficit trees are global circulation heat water. This change order 5 mm some species. this paper, a strain gauge sensor based core mismatch technique measurement proposed investigated. The formed by splicing an uncoated short section MMF (Multimode Fiber) between two standard SMFs (Singlemode called SMF–MMF–SMF (SMS); length 15 mm. cylindrical structures were placed 3D printer, with different sizes (DS: 80 110 mm), assist changes. SMS was printed fixed at points, such that, reducing structure, presents dips peaks shift transmittance spectrum due induced curvature strain. Three values used spacing fixation points (FP): (a) mm, (b) 10 (c) For each choice DS = mm: sensitivity −0.876 nm/mm, R2 0.9909 dynamic range mm; −0.3892 0.9954 4 −0.768 0.9811 2 points: −0.22 0.9979 8 −0.2284 0.9888 6 −0.691 0.9892 3.5