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File:BiodegradablePlasticUtensils1.jpg

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Original file(2,700 × 1,757 pixels, file size: 559 KB, MIME type: image/jpeg)

Summary[edit]

Description
English: 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.
Français : Couteaux, fourchettes et cuillères biodégradables en polyester à base d'amidon.
Português: Facas, garfos e colheres fabricadas com um material poliéster biodegradável à base de amido. A foto foi tirada usando o método fotoelástico, um método experimental que fornece uma imagem bastante precisa da distribuição do stress mesmo que o material possua descontinuidades abruptas.
Tiếng Việt: Dao, nĩa, muỗng được làm từ một loại vật liệu bột sợi tổng hợp có khả năng phân huỷ sinh học.
Date Unknown date
Unknown date
Source
US-AgriculturalResearchService-Logo.svg
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).

This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing for more information.


English | français | македонски | +/−

Author Scott Bauer
Permission
(Reusing this file)
Public domain
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.

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USDA logo.svg

Assessment[edit]

POTY
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This file was a candidate in Picture of the Year 2007.
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Picture of the day This image was selected as picture of the day on Wikimedia Commons for . It was captioned as follows:
English: Knives, forks, and spoons made from a biodegradable starch-polyester material.

File history

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Date/TimeThumbnailDimensionsUserComment
current21:51, 22 April 2007Thumbnail for version as of 21:51, 22 April 20072,700 × 1,757 (559 KB)17Drew~commonswiki (talk | contribs)darkened background
18:14, 14 February 2007Thumbnail for version as of 18:14, 14 February 20072,700 × 1,757 (1.96 MB)17Drew~commonswiki (talk | contribs){{Information |Description=knives, forks, and spoons made from a biodegradable starch-polyester material |Source=United States Department of Agriculture ([http://www.ars.usda.gov/is/graphics/photos/k7245-1.htm link])<br>noise removed with a Gaussian blur
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