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File:BiodegradablePlasticUtensils2.jpg

From Wikipedia, the free encyclopedia

Original file ‎(2,548 × 1,757 pixels, file size: 420 KB, MIME type: image/jpeg)

Wikipedia

 This is a featured picture on the English language Wikipedia (Featured pictures) and is considered one of the finest images. See its nomination here.

If you think this file should be featured on Wikimedia Commons as well, feel free to nominate it.
If you have an image of similar quality that can be published under a suitable copyright license, be sure to upload it, tag it, and nominate it.

Description

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.
Date Unknown date
Unknown date
Source
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.

العربية | 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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    noise removed, uncropped, Featured Picture
  • Original
    Original
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MIME type

image/jpeg

checksum

f53d0c12d076037c647efd26984b3f46a2b1530f

determination method: SHA-1

data size

430,408 byte

height

1,757 pixel

width

2,548 pixel

File history

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Date/TimeThumbnailDimensionsUserComment
current20:19, 22 February 2007Thumbnail for version as of 20:19, 22 February 20072,548 × 1,757 (420 KB)17Drew~commonswiki{{Information |Description=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
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Retrieved from "https://en.wikipedia.org/w/index.php?title=File:BiodegradablePlasticUtensils2.jpg&oldid=185892274"
This page was last edited on 21 January 2008, at 16:11
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