Gambar:BiodegradablePlasticUtensils1.jpg

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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.
Source

United States Department of Agriculture (link)
noise removed with a Gaussian blur in The GIMP

Date

unknown

Author

Scott Bauer

Permission
Public domain This image is a work of a United States Department of Agriculture employee, taken or made during the course of the person's official duties. As a work of the U.S. federal government, the image is in the public domain.
Other versions

Image:BiodegradablePlasticUtensils.jpg (original)

Image:BiodegradablePlasticUtensils2.jpg (cropped)
Featured picture This is a featured picture on Wikimedia Commons. We believe it is one of the finest images on Commons. 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.
Picture of the day This image was selected as a picture of the day for April 06, 2007. It was captioned as followed:
English: Knives, forks, and spoons made from a biodegradable starch-polyester material.
Deutsch: Besteck aus biologisch abbaubarem Stärke-Polyester.
Français : Fourchettes, couteaux et cuillères biodégradables, en polyester à base d'amidon.
Español: Cuchillos, tenedores y cucharas realizados a partir de material biodegradable.

Беларуская: Сталовыя прыборы, вырабленыя з біяраскладальнага крухмал-палістыролу.
Česky: Jídelní příbory vyrobené z polymerních biodegradabilních materiálů
Deutsch: Besteck aus biologisch abbaubarem Stärke-Polyester.
English: Knives, forks, and spoons made from a biodegradable starch-polyester material.
Esperanto: Forkoj, tranĉiloj kaj kuleroj produktitaj el biodegradiĝema materialo.
Español: Cuchillos, tenedores y cucharas realizados a partir de material biodegradable.
Suomi: Luonnossa hajoavasta materiaalista valmistettuja veitsiä, haarukoita ja lusikoita
Français : Fourchettes, couteaux et cuillères biodégradables, en polyester à base d'amidon.
Magyar : Evőeszközök biológiailag lebomló poliészterből
Italiano: Forchette, coltelli e cucchiai realizzati a partire da materiale biodegradabile.
Nederlands: Messen, vorken en lepels gemaakt van een organisch zetmeel-polyestermateriaal. Foto gemaakt met de foto-elasticimetriemethode.
Polski: Noże, łyżki i widelce wykonane z materiałów biodegradowalnych.
Русский: Ножи, вилки и ложки, изготовленные из разлагаемого микроорганизмами полиэстера на основе крахмала.
Slovenčina: Jedálne príbory vyrobené z polymérnych biodegradabilných materiálov
Svenska: Biologiskt nedbrytbara knivar, gafflar och skedar kan tillverkas av stärkelse-polyester-material.
简体中文: 应用显示内部应力分布的弹性光学方法拍摄的,用可降解的淀粉塑料制造的餐刀叉子
繁體中文: 以生物可分解的澱粉聚酯物料製成的餐刀餐叉

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