... | ... | @@ -9,7 +9,7 @@ For a detailed wave equations look at [this section](https://git-xen.lmgc.univ-m |
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* The photo-elastic technique: The combination of linear polarizer 1 and quarter-wave plate 1, with 45 degrees difference of principle directions, turns unpolarized white light into circularly polarized light passing through the photo-elastic material. The second combination of polarizer and plate creates a circular polarizer with opposite polarity, blocking the unperturbed light. In case of local anisotropic stress in the photo-elastic material, there will be different phase shifts for different components of the light polarization. This phase shifts perturbs the polarity of the wave, causing the light to be observed by the camera:
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![ch2_elasticity](uploads/a15a9546b74692ad30aeb4e3aa45b7bd/ch2_elasticity.png)
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![fig1](uploads/2b484fd324a478d488f2d7d464111065/fig1.png)
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