BiodegradablePlasticUtensils1
The photo has been realized using the photoelasticity method, an experimental method which gets a fairly accurate picture of stress distribution even around abrupt discontinuities in a material.
When a ray of plane polarised light is passed through a photoelastic material, it gets resolved along the two principal stress directions and each of these components experiences different refractive indices. The difference in the refractive indices leads to a relative phase retardation between the two component waves.
The setup used to photograph this photo was probably composed of:
- A regular light source, with a quarter-wave plate installed to polarize the emerging light
- A regular photo camera, with a quarter-wave plate installed in front of the lens
Light and camera being installed and oriented in the same direction, the two
quarter-wave plates were turned with the polarizing axis in the same direction.Relevante Bilder
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