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Another type of Polaroid is the K-sheet polarizer, which consists of aligned polyvinylene chains in a PVA polymer created by dehydrating PVA. This polarizer material is particularly resistant to humidity and heat. [3]
However, this crystal is seldom used as a polarizer, since the dichroic effect is strongly wavelength dependent and the crystal appears coloured. Herapathite is also dichroic, and is not strongly coloured, but is difficult to grow in large crystals. A Polaroid polarizing filter functions similarly on an atomic scale to the wire-grid polarizer ...
Circular polarizer/linear analyzer [1] filtering unpolarized light and then circularly polarizing the result. A polarizing filter or polarising filter (see spelling differences) is a filter that is often placed in front of a camera lens in photography in order to darken skies, manage reflections, or suppress glare from the surface of lakes or the sea.
Their Polaroid filters, stapled over rectangular openings where the headlights ought to be, were very small. [ 12 ] Cardboard glasses with earpieces and larger filters were used to watch Bwana Devil , the feature-length color 3-D film that premiered on 26 November 1952 and ignited the brief but intense 3-D fad of the 1950s.
Polaroid Corporation was an American company best known for its instant film and cameras, which now survives as a brand for consumer electronics. The company was founded in 1937 by Edwin H. Land, to exploit the use of his Polaroid polarizing polymer. [1]
Edwin Herbert Land, ForMemRS, [2] FRPS, Hon.MRI (May 7, 1909 – March 1, 1991) was an American scientist and inventor, [4] best known as the co-founder of the Polaroid Corporation.
Polaroid film, instant film, and photographs; Polaroid B.V., a Dutch manufacturer of instant film and cameras, owner of Polaroid Corporation's brand and intellectual property; Polaroid (polarizer), a type of synthetic plastic sheet used to polarize light; Polaroid Eyewear, with glare-reducing polarized lenses made from Polaroid's polarizer
Herapathite's dichroic properties came to the attention of Sir David Brewster, and were later used by Edwin H. Land in 1929 to construct the first type of Polaroid sheet polarizer. He did this by embedding herapathite crystals in a polymer instead of growing a single large crystal.