石油科学通报2026，Vol.11Issue(4)：1014-1031,18.DOI:10.3969/j.issn.2096-1693.2026.03.020
分布式光纤传感中的应变分解与解释方法
Strain decomposition and interpretation methods for distributed fiber optic sensing
摘要
Abstract
Aiming to enhance understanding of the measured strain by distributed fiber optic sensing,a universal fiber strain decomposition model and interpretation framework have been proposed according to tensor analysis.And then the strict solutions to strain decomposition equations within elastic small deformation situation have been also given that adopted to most problem scenario covering fiber deployment in plane and cylindrical surface.Specifically addressing the issue in rock mechanics where there is an unclear understanding of the decomposition of helical fiber strain in uniaxial and triaxial compression tests,starting from the geometric definition of strain and using the law of cosines,this study for the first time derived the elastic small-deforma-tion solution of the fiber strain decomposition equation consistent with the tensor projection method,and dialectically discussed the currently published strain decomposition methods.In addition,it also proved the existence of a critical helical rising angle that can make the measured fiber strain zero,and pointed out that fiber deployment strategies near the critical helical angle can relax the measurement limits within the fiber strain range.Finally,starting from the engineering strain geometric definition and combining with the law of cosines,the study for the first time fully presented the fiber strain decomposition equation solution applicable to geometric large deformations.The work emphasizes that in actual fiber deployment and interpretation processes,it is necessary to clarify the problem scenario requirements and assumptions,and to adopt an appropriate fiber deployment geometry and corresponding strain decomposition method.关键词
分布式光纤传感/应变分解/螺旋布纤/张量投影/岩石力学Key words
distributed fiber optic sensing/strain decomposition/helical fiber optic deployment/tensor projection/rock mechanics分类
能源科技引用本文复制引用
张亚洲,金衍,卢运虎..分布式光纤传感中的应变分解与解释方法[J].石油科学通报,2026,11(4):1014-1031,18.基金项目
国家自然科学基金重点项目(52334001)资助 （52334001）
