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Definition of "Zone Plate" |
A flat glass plate with concentric opaque rings that forms an image caused by diffraction rather than reflection. / Zone plate is a device used to focus light or other things exhibiting wave character.Unlike lenses or curved mirrors however, zone plates use diffraction instead of refraction or reflection. Based on analysis by Augustin-Jean Fresnel, they are sometimes called Fresnel zone plates in his honor. The zone plate's focusing ability is an extension of the Arago spot phenomenon caused by diffraction from an opaque disc. / An ITU standard for high-speed synchronous data exchange. In the U.S., V.35 is the interface standard used by most routers and DSUs that connect to T-1 carriers. / a Fresnel optical circular grating that produces the spatial frequencies to measure the resolution and the performance of telephoto- graphic or television systems.Amoving Fresnel zone plate can measure the performance of line- or frame-based comb filters, the performance of scan converters,and the scan aperture of television images. |
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