摘要
利用偏振相机实现瞬时相移获取光弹条纹的方法缺乏定量误差及补偿分析。圆偏场瞬时光弹相移法的误差主要是1/4波片与光源波长不匹配造成的。首先,基于Stokes矢量和Mueller矩阵,从理论上推导了光弹特性的误差及补偿方程,讨论了样品应力方向角和相位延迟量的误差分布。结果表明:等差线条纹误差正比于失配值;等倾线条纹误差是非线性的,但正比于失配值的余弦,反比于两个光强之差。然后,分析了光源谱线宽度对补偿效果的影响,结果显示谱宽的限制与波长成正比,与失配误差成反比。最后,结合对径受压圆盘的模拟和实验验证了误差分析及补偿方法的正确性,并论述了等倾线应力方向分离的问题。
When a polarized camera is used to realize instantaneous phaseshifting and obtain photoelastic fringes,quantitative error and compensation analysis is often ignored.The error of the instantaneous photoelastic phaseshifting method in a circularly polarized field is primarily caused by a mismatch between the wavelength of the quarterwave plate and the light source.Based on the Stokes vector and Mueller matrix,this paper theoretically derives the error and compensation equations of the photoelastic properties,and discusses the error distribution of the stress direction angle and phase retardation of samples.The results show that the isochromatic fringe error is directly proportional to the mismatch value.In addition,the isoclinic fringe error is nonlinear,but it is in direct proportion to the cosine of the mismatch value and inverse proportion to the difference between two light intensities.Furthermore,the paper analyzes the influence of the spectral width of the light source on the compensation effect,and finds that the spectral width is directly proportional to the wavelength and inversely proportional to the mismatch error.Finally,the correctness of the error analysis and compensation method is verified through the simulations and experiments of the diameterstressed disk,and the isoclinic separation in the stress direction is discussed.
作者
万新军
高阳
韦晓孝
王臻磊
汪嘉欣
Wan Xinjun;Gao Yang;Wei Xiaoxiao;Wang Zhenlei;Wang Jiaxin(School of OpticalElectrical and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2022年第21期160-167,共8页
Acta Optica Sinica
基金
国家自然科学基金(61505107)
上海市科技创新行动计划(19511104600)。
关键词
测量
光弹
相移法
误差分析
measurement
photoelastic
phaseshifting method
error analysis
