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Schaefer–Bergmann Diffraction
Schaefer–Bergmann diffraction is the resulting diffraction pattern of light interacting with sound waves in transparent crystal A crystal or crystalline solid is a solid material whose constituents (such as atoms, molecules, or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions. In addition, macro ...s or glasses. See also * http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=1076617 * http://prola.aps.org/abstract/PR/v52/i3/p223_1 DOI.org References Diffraction {{optics-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diffraction
Diffraction is defined as the interference or bending of waves around the corners of an obstacle or through an aperture into the region of geometrical shadow of the obstacle/aperture. The diffracting object or aperture effectively becomes a secondary source of the propagating wave. Italian scientist Francesco Maria Grimaldi coined the word ''diffraction'' and was the first to record accurate observations of the phenomenon in 1660. In classical physics, the diffraction phenomenon is described by the Huygens–Fresnel principle that treats each point in a propagating wavefront as a collection of individual spherical wavelets. The characteristic bending pattern is most pronounced when a wave from a coherent source (such as a laser) encounters a slit/aperture that is comparable in size to its wavelength, as shown in the inserted image. This is due to the addition, or interference, of different points on the wavefront (or, equivalently, each wavelet) that travel by paths of d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sound Waves
In physics, sound is a vibration that propagates as an acoustic wave, through a transmission medium such as a gas, liquid or solid. In human physiology and psychology, sound is the ''reception'' of such waves and their ''perception'' by the brain. Only acoustic waves that have frequencies lying between about 20 Hz and 20 kHz, the audio frequency range, elicit an auditory percept in humans. In air at atmospheric pressure, these represent sound waves with wavelengths of to . Sound waves above 20 kHz are known as ultrasound and are not audible to humans. Sound waves below 20 Hz are known as infrasound. Different animal species have varying hearing ranges. Acoustics Acoustics is the interdisciplinary science that deals with the study of mechanical waves in gasses, liquids, and solids including vibration, sound, ultrasound, and infrasound. A scientist who works in the field of acoustics is an ''acoustician'', while someone working in the field of acoustical ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crystal
A crystal or crystalline solid is a solid material whose constituents (such as atoms, molecules, or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions. In addition, macroscopic single crystals are usually identifiable by their geometrical shape, consisting of flat faces with specific, characteristic orientations. The scientific study of crystals and crystal formation is known as crystallography. The process of crystal formation via mechanisms of crystal growth is called crystallization or solidification. The word ''crystal'' derives from the Ancient Greek word (), meaning both "ice" and "rock crystal", from (), "icy cold, frost". Examples of large crystals include snowflakes, diamonds, and table salt. Most inorganic solids are not crystals but polycrystals, i.e. many microscopic crystals fused together into a single solid. Polycrystals include most metals, rocks, ceramics, and ice. A third category of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
AOD Loops Schaefer-Bergmann
AOD may refer to: Army * Army Ordnance Department, a forerunner of the British Royal Army Ordnance Corps (RAOC) Arts and entertainment Film * ''Army of Darkness'', a 1993 film, third in the ''Evil Dead'' series Music * Adrenalin O.D., a US hardcore punk band * ''Act of Depression'', the debut album by Underoath * Art of Dying (band), a hard rock band * Assembly of Dust, an American rock band * Aubrey O'Day, an American singer/dancer Video games * '' Tomb Raider: The Angel of Darkness'', the 6th game in the ''Tomb Raider'' series * '' Art of Defense'', a type of multiplayer game common in '' Command & Conquer Generals: Zero Hour'' * Astro On Demand, a Hong Kong TVB subscription channel * Arsenal of Democracy (video game), a grand strategy wargame * Angels of Death (video game), a Japanese horror adventure game Other * Animation On Display, formerly Anime Overdose and then AOD: The San Francisco Animation Convention Fraternal order * Ancient Order of Druids, fraternal order reviv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
