Abstract
In most polariscopes, the fringe-order determination is performed by compensators and the fractional orders are measured using the well-known Tardy or Senarmont methods.
The method described here provides the capability of fractional-order determination using common rotation of polarizer-analyzer, thus simplifying somewhat the construction and use of the polariscope. The relative performance of this method is discussed and its application to the automated bichromatic polariscope described.
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Abbreviations
- N :
-
photoelastic-fringe order
- β :
-
direction of principal stress
- λ:
-
wavelength of light
- δ:
-
retardation, δ=Nλ
- ϕ:
-
phase retardation, φ =\(\frac{{2\pi \delta }}{\lambda }\)
- α,γ:
-
angle, rotation of polarizers
- I :
-
light intensity
- ∈Q :
-
error in the retardation of quarter-wave plates
References
Jessop, H. T., “On the Tardy and Senarmont Methods of Measuring Fractional Relative Retardation,”British Journal of Applied Physics,14,138–141 (May 1953).
Chakrabath, S. K. andMachin, K. E., “Accuracy of Compensation Methods in Photoelastic Fringe-order Measurements,”Experimental Mechanics,9 (9),429–431 (Sept. 1969).
Redner, S., “New Automatic Polariscope System,”Experimental Mechanics,14 (12),486–491 (Dec. 1974).
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Redner, S. Compensation method using synchronized polarizer—Analyzer rotation. Experimental Mechanics 16, 221–225 (1976). https://doi.org/10.1007/BF02329272
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DOI: https://doi.org/10.1007/BF02329272