H-1-3 偏光感受型OpticaI Coherence Tomographyを用いた応力断層 可視化法の基礎的検討(マイクロナノ理工学,口頭発表)

抄録

Recently,Polarization Sensitive Optical Coherence Tomography(PS-OCT)has been developed as a tomographical and non-destructive visualization method of birefringence in turbid media at the micrometer resolution.In this study,a novel tomographic system of stress visualization(PS-OCSE) is proposed on the basis of PS-OCT,which can provide stress tomography from photo-elastic interference fringe pattern at a cross-section,even when a sample is turbid material under not plane stress condition but 3-dimensional stress condition.In this experiment,PS-OCSE was applied to low density polyethylene(LDPE) samples under the loading.Consequently,this system can offer the tomographic retardation map S_3/S_0(x,z) which was verified to be depth-resolved and be dependent on the loading stress.Therefore,the spatial fringe frequency can be locally estimated by the proposed stress analysis based on Newton-Raphson method which high spatial and frequency resolution,determining stress tomographic distribution.