| 摘要 |
PROBLEM TO BE SOLVED: To improve accuracy of detection of a strain marker while suppressing cost increase. SOLUTION: A strain observation system 40 obtaining strain distribution dataε(X) by Brillouin backward scattering analysis includes: an optic fiber sensor 50 in which an optical fiber 23 is fixed onto a flexible long supporter such as a sheath 24 with a fixed pitch Y corresponding to an incident light pulse width S, and on which strain marker units 52 of a strong strainεn are sprinkled or scattered, wherein a strain marker unit length N is in the middle between a sample pitch D and the incident light pulse width S, and the fixed pitch Y; and a second calculation unit processing the strain distribution dataε(X) including a strain marker detection means determining the strain marker position Xn by extracting pulse like wave parts with width W shorter than a discrimination width Nn (N≤Nn<S, Y) from the strain distribution dataε(X), and a position correction means performing position correction process on the strain distribution dataε(X) based on the strain marker. COPYRIGHT: (C)2009,JPO&INPIT
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