基于影栅虚云纹场的概念，提出并实现了对形貌影栅云纹法利用计算机布置影栅云纹仪各种光场，自动生成高质量全场仿真影栅云纹图，建立了一种数字仿真形貌影栅云纹法自动测量和处理一体化实验系统(全文简称为实验系统)．系统特别适合于作为形貌影栅云纹法误差分析的评估系统，对光场布置不同的影栅云纹仪及其对应的相移值近似程度不一样引起的初始系统误差进行分析、预测和评估，给出减少这种系统误差应遵循的准则．

The authors regret that errors occurred in the previous paper (Chin. Opt. Lett. 4, 164. A phase-stepping interferometric photoelasticity method is proposed to determine whole-field sum of principal stresses. The four phase steps are introduced by rotating quarter-wave plate and analyzer at definite optical arrangements. Light intensities and phase-stepping formula for the proposed method are derived using Jones calculus. Simulations of a circular disk under diametral compression demonstrate the feasibility of the proposed method). This is the erratum to the errors.

A phase-stepping interferometric photoelasticity method is proposed to determine whole-filed sum of principal stresses. The four phase steps are introduced by rotating quarter-wave plate and analyzer at definite optical arrangements. Light intensities and phase-stepping formula for the proposed method are derived using Jones calculus. Simulations of a circular disk under diametral compression demonstrate the feasibility of the proposed method.

Among data acquisition techniques in digital photoelasticity, the integrated phase shifting technique (IPST) can real-time analyze the photoelastic parameters at a video rate of the high speed CCD camera. In this paper, fourteen algorithms are described by different configurations of the rotating an analyzer at a constant rate and an output quarter-wave plate at another constant rate. The theoretical comparisons of the algorithms are given by the simulated phase distributions of the isochromatic and isoclinic parameters of the disk under two cases that the load keeps unchangeable or linearly increasing in exposure time of the camera. Then a guideline is given to alleviate the influence of the load changing with time on the IPST.