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Fresnel zone |
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Fresnel zone [freznel′] Etymology: Augustine J. Fresnel, French physicist, 1788-1827 the region nearest the face of an ultrasound transducer. It is characterized by a highly collimated beam with great variation in ultrasound intensity and is generally the area of best image resolution. Also called near field. Fresnel zone in ultrasonography, the area of the sound beam between the transducer and the focal zone in which complex diffraction patterns occur. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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The microscope had a 98 [mu] diameter Fresnel zone plate with an outer zone width of 40 nm and integrated gold central stop with a 40 [mu] m diameter. Although the deployment was Near-Line-of-Sight (nLoS), with a partially obstructed fresnel zone, radio and radar interference at and around the airport prevented wireless systems from reliably connecting. An algorithm is presented for assembling tiles into a variable spaced grating, the one-dimensional analog of a Fresnel zone plate. |
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