Research on Optical Fiber Axial Residual Stress Measurement Based on Photoelasticity
The residual stress of optical fibers can affect their optical performance and mechanical properties.In this study,fiber axial residual stress detection was conducted based on the photoelastic method.A photoelastic model of the optical fiber was established,and the Jones matrix was used to analyze the light intensity distribution characteristics in the photoelastic pattern.Considering the small range of birefringence phase difference caused by residual stress,phase extraction was performed using the minimum light intensity method.The phase extraction algorithm accuracy was simulated and verified,showing a theoretical phase error of less than±0.02° under the condition that the measured phase did not exceed±5°.The phase information was then recon-structed to stress results using third-order spline interpolation.Experimental results were compared with a commercial instrument,and except for significant fluctuations in some stress regions,the stress distribution characteristics were generally consistent in oth-er areas.
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