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Variable isochromatic/isopachic-fringe visibility in photoholoelasticity

System described in this paper permits the separate determination of isopachic and isochromatic fringes with a continuously variable ratio in visibility

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Abstract

This paper presents a new “hybrid” method whereby the ratio of the isochromatic-fringe visibility/isopachic-fringe visibility may be easily and continuously varied. This simple procedure merely combines a conventional polariscope with a holographic system. A variable beam splitter permits an incoherent superposition of the reconstruction of a doubly exposed hologram with real-time isochromatics, either dark or light field. By varying the ratios of the above two, in the image plane, numerous interesting results may be obtained including:

  1. (1)

    Isochromatics only, without errors in position

  2. (2)

    Isochromatics-isopachic fringes identical to those obtained through classical interferometry

  3. (3)

    Isochromatic-isopachic fringes whereby the amplitude modulation between the two may be minimized

  4. (4)

    Continuously variable isopachic/isochromatic-fringe visibility.

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References

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Authors and Affiliations

  1. Oakland University, 48063, Rochester, MI

    Joseph Der Hovanesian (Professor of Engineering)

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  1. Joseph Der Hovanesian
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Der Hovanesian, J. Variable isochromatic/isopachic-fringe visibility in photoholoelasticity. Experimental Mechanics 14, 233–236 (1974). https://doi.org/10.1007/BF02323324

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  • DOI: https://doi.org/10.1007/BF02323324

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