BiodegradablePlasticUtensils2

Autor/Urheber:

Scott Bauer

Shortlink:

https://www.dewiki.de/b/22152f

Quelle:

Wikimedia Commons

Größe:

2548 x 1757 Pixel (430408 Bytes)

Beschreibung:

Knives, forks, and spoons made from a biodegradable starch-polyester material. 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.

Kommentar zur Lizenz:

This image or file is a work of a United States Department of Agriculture employee, taken or made as part of that person's official duties. As a work of the U.S. federal government, the image is in the public domain.

Lizenz:

Public domain

Credit:

This image was released by the Agricultural Research Service, the research agency of the United States Department of Agriculture, with the ID k7245-1 (next).

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