In many laboratories of universities and industrial organizations, commercial polariscopes have the feature that the relative position of the two quarter-wave plates is fixed. This is due to the requirement of transforming a plane polariscope to a circular polariscope with greater precision and ease. Unfortunately, these polariscopes cannot implement Patterson and Wang’s [Strain 27, 49–56 (1991)] phase-shifting algorithm because this algorithm requires that the second quarter-wave plate and the analyzer of the circular polariscope be capable of independent rotation. A new phase-shifting method that can be applied under these constraints is proposed. A comparative study with Patterson and Wang’s [Strain 27, 49–56 (1991)] algorithm shows very good agreement. Furthermore, it is shown that four phase steps are sufficient to determine both the isoclinic and the isochromatic parameters.
© 1999 Optical Society of America
[Optical Society of America ]
(050.5080) Diffraction and gratings : Phase shift
(100.5010) Image processing : Pattern recognition
(110.2960) Imaging systems : Image analysis
(120.2650) Instrumentation, measurement, and metrology : Fringe analysis
Anand Asundi, Liu Tong, and Chai Gin Boay, "Phase-Shifting Method with a Normal Polariscope," Appl. Opt. 38, 5931-5935 (1999)