దస్త్రం:BiodegradablePlasticUtensils2.jpg

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అసలు దస్త్రం(2,548 × 1,757 పిక్సెళ్ళు, ఫైలు పరిమాణం: 420 KB, MIME రకం: image/jpeg)

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వివరణ

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.
తేదీ అజ్ఞాత తేదీ
Unknown date
మూలం
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.


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కర్త Scott Bauer
అనుమతి
(ఈ దస్త్రాన్ని పునర్వినియోగించుకోవడం)
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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చిత్రణ

media type ఇంగ్లీష్

image/jpeg

checksum ఇంగ్లీష్

f53d0c12d076037c647efd26984b3f46a2b1530f

data size ఇంగ్లీష్

4,30,408 బైట్

1,757 చిణువు

2,548 చిణువు

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ప్రస్తుత20:19, 22 ఫిబ్రవరి 200720:19, 22 ఫిబ్రవరి 2007 నాటి కూర్పు నఖచిత్రం2,548 × 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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