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| 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.
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| Source |
United States Department of Agriculture (link)
noise removed with a Gaussian blur in The GIMP
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| Date |
unknown
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| Author |
Scott Bauer
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| Permission |
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| Other versions |
Image:BiodegradablePlasticUtensils.jpg (original)
Image:BiodegradablePlasticUtensils2.jpg (cropped) |
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This image was selected as a picture of the day for April 06, 2007. It was captioned as followed:
Česky: Jídelní příbory vyrobené z polymerních biodegradabilních materiálů
Nederlands: Messen, vorken en lepels gemaakt van een organisch zetmeel-polyestermateriaal. Foto gemaakt met de foto-elasticimetriemethode.
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 和匙。
繁體中文: 以生物可分解的澱粉聚酯物料製成的餐刀、餐叉和匙
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