抄録
The automatic measurement of the total relative phase retardation (ρitol) of a photoelastic model is performed in the whole field by using the linearly polarized light at three different wavelengths of monochromatic light. The relative phase retardation (ρi) at each wavelength λi is obtained from Stokes parameters without the influence of the isoclinic angle. The measurement range of the model can be more widely taken compared with a two-wavelength method. The ρitol was calculated by the coincident method using ρ1, ρ2 and ρ3. In the experiment of the circular disk under compression, the ρitol in the rang 0-5π agreed well with the theoretical values.
