otheruses Unreferenced date November 2008 In physics , a wavefront is the Locus mathematics locus a line ... provides a quick method to predict the propagation of a wavefront through, for example, free space . The construction is as follows Let every point on the wavefront be considered a new point source ... can be computed directly. For example, a spherical wavefront will remain spherical as the energy ... are always perpendicular to the wavefront, are called ray geometry rays creating multiple wavefronts. The simplest form of a wavefront is the plane wave , where the rays are parallel geometry parallel to one another. The light from this type of wave is referred to as collimated light. The plane wavefront is a good model for a surface section of a very large spherical wavefront for instance, sunlight strikes the earth with a spherical wavefront that has a radius of about 93 million miles 1 Astronomical Unit AU . For many purposes, such a wavefront can be considered planar. Wavefront aberrations Methods utilizing wavefront measurements or predictions can be considered an advanced approach to lens .... The deviation of a wavefront in an optical system from a desired perfect planar wavefront is called the wavefront aberration . Wavefront aberrations are usually described as either a sampled ... desirable for many applications in optical systems. Wavefront sensor and reconstruction techniques A wavefront sensor is a device which measures the wavefront aberration in a coherent signal .... Alternative wavefront sensing techniques to the Shack Hartmann system are emerging. Mathematical techniques like phase imaging or curvature sensing are also capable of providing wavefront estimations. These algorithms compute wavefront images from conventional brightfield images at different focal planes without the need for specialised wavefront optics. While Shack Hartmann lenslet arrays ... limited by the resolution of digital images used to compute the wavefront measurements. Another ... more details
A wavefront sensor is a device for measuring the aberrations of an optical wavefront . Although an amplitude splitting interferometer such as the Michelson interferometer could be called a wavefront sensor, the term is normally applied to instruments that do not require an unaberrated reference beam to interfere with. They are commonly used in adaptive optics systems, lens testing and increasingly in ophthalmology . There are several types of wavefront sensors, including Common Path Interferometer Foucault knife edge test Multilateral shearing interferometer Ronchi test Ronchi tester Shack Hartmann Shearing Interferometer Wavefront Curvature Sensor See also Adaptive optics Deformable mirror Wavefront External links http www.ctio.noao.edu atokovin tutorial part3 wfs.html AO Tutorial Wave front Sensors http www.adaptiveoptics.org Establishments.html Wavefront sensing Establishments Research groups and companies with interests in wavefront sensing and adaptive optics. Category Astronomy Category Optics fr Analyseur de front d onde ... more details
In physics, a wavefront is the locus a line, or, in a wave propagating in 3 dimensions, a surface of points having the same phase. Wavefront may also refer to Wave front set , WF f , a mathematical set in the field of microlocal analysis that characterizes the singularities of a generalized function in space and with respect to its Fourier transform at each point Wavefront arbiter , a circuit used to make decisions which control the crossbar of a high capacity switch fabric in parallel. Wavefront coding , a method for increasing the depth of field in an image to produce sharper images Wavefront Technologies , a computer graphics company that developed and sold animation software used in Hollywood motion pictures and other industries Wavefront Technology Solutions Inc. , an improved injection company for the petroleum and environmental sectors disambig ... more details
Wavefront Technologies was a computer graphics company that developed and sold computer animation animation ... at the time. In 1995, Wavefront Technologies was purchased by Silicon Graphics and merged with Alias Systems Corporation Alias Research to form Alias Wavefront. Products Wavefront developed their first ... , and NASA . Some of Wavefront s early animation software was created by Bill Kovacs , Jim Keating ..., developed the company s flagship product, the Wavefront The Advanced Visualizer Advanced Visualizer . In 1988, Wavefront released the Personal Visualizer, a desktop workstation interface to their high end rendering software. As with Wavefront s other software, it was developed for Silicon Graphics ... Equipment Corporation DEC and Sony systems. Wavefront purchased Silicon Graphics first production ... . In 1991, Wavefront introduced Composer, an image manipulation product. Composer became a standard ... , Wavefront partnered with Atari to develop the GameWare game development software. GameWare was the exclusive graphics and animation development system for the Atari Jaguar . Wavefront software was used ... Lies and Stargate film Stargate . Electronic Arts Richard Taylor, said that Wavefront s software was so beautifully designed that even a non technical person could learn it. Wavefront was a major ... Ellen Wolff journal Millimeter date 1 Jun 2006 pages 8 ref Acquisitions and mergers Wavefront was involved .... In 1988, Wavefront acquired Abel Image Research, a division of Robert Abel and Associates , where ... government, following Wavefront s establishment of an office in Ghent in association with Barco Graphics of Kortrijk . Acquiring Abel Image Research increased Wavefront s presence in Japan . The Japanese conglomerate CSK Holdings Corporation CSK became a part owner of Wavefront Japan in 1990, helping to expand the company further in Asia. Wavefront acquired rival computer graphics company Thomson ... 7, 1995, Silicon Graphics announced that it would purchase Wavefront Technologies and Alias Systems ... more details
In optics and signal processing , wavefront coding is a method for creating optical transfer function s of lens optics lenses with specially designed phase mask s, encoding, to produce point spread function s of visible light, images, with manipulatable information such as depth of field and distance . Wavefront coding falls under the broad category of computational photography as a technique to enhance the depth of field. Encoding Linear phase mask Wavefront Coding with linear phase masks works by creating an optical transfer function that encodes distance information. ref name LinearPhasePatent http www.patentstorm.us patents 7218448 description.html US Patent 7218448 Extended depth of field optical systems ref Cubic phase mask Wavefront Coding with cubic phase masks works to blur the image uniformly using a cubic shaped waveplate so that the intermediate image, the optical transfer function, is out of Focus optics focus by a constant amount. Digital image processing then removes the blur and introduces noise depending upon the physical characteristics of the processor. Dynamic range is sacrificed to extend the depth of field depending upon the type of filter used. It can also correct optical aberration . ref name StanfordPaper http graphics.stanford.edu courses cs448a 06 winter dowski wavefront coding optics95.pdf Extended depth of field through wave front coding ref The mask was developed by using the ambiguity function and the stationary phase method History The technique was pioneered by radar engineer Edward Dowski and his thesis adviser Thomas Cathey at the University of Colorado at Boulder University of Colorado in the United States in the 1990s. After the university ... 18342 Wavefront coding keeps a focus on applications ref they have since founded a company to commercialize ... , which has released wavefront coding based mobile camera chips as TrueFocus sensors. TrueFocus sensors ... ARTCL&ARTICLE ID 197348&VERSION NUM 1 Wavefront coding finds increasing use Laser Focus World Wikinvest ... more details
A Wavefront arbiter is a circuit used to make decisions which control the crossbar of a high capacity switch fabric in parallel. It was commercialized in the TT1 and TTx chip sets designed by Abrizio and sold by PMC Sierra . Context A crossbar is the central portion of a crossbar switch fabric which connects the inputs to the outputs. A set of decisions of which inputs are connected to which outputs must be made each arbitration period. In high speed cell switching or packet switching applications, the arbitration period is very short. There are often millions or 1000000000 number billion s of arbitration periods per second. An Arbiter electronics arbiter is the circuit that makes the decision as to which of the crossbar s many switches should be closed. Speed is a key design criterion of an arbiter in some applications. Algorithm description A wavefront aribiter is a particular type of arbiter that is optimized for high speed operation. For a unicast switch, the algorithm is as follows The decision starts at a single point in the x y matrix which represents the physical switches, for example the upper left hand corner. Based on the requests, a decision is made whether to close that switch, connecting the corresponding input and output. The result of this decision is then fed to the right along the matrix axis representing the input, and down along the matrix axis representing the output. The results of the first computation then enable the next computation at the point to the right and at the point below and switch closing decision is made at each of those two points. The results of these subsequent two calculations then are then fed to the points below and to the right of them. These results then enable the decisions at the next three points which are to the right and below. These results are again fed to the right and below. In the case where the calculation did not start ... in a combinatorial manner without hardware register s , allowing the wavefront to propagate ... more details
A wavefront curvature sensor is a device for measuring the aberrations of an optical wavefront . Like a Shack Hartmann wavefront sensor it uses an array of small lenses or lenslets to focus the wavefront into an array of spots. Unlike the Shack Hartmann, which measures the position of the spots, the curvature sensor measures the intensity on either side of the focal plane. If a wavefront has a phase curvature, it will alter the position of the focal spot along the axis of the beam, thus by measuring the relative intensities in two places the curvature can be deduced. See also adaptive optics Adaptive Optics Sources F. Roddier, Appl. Opt., 27, 1223, 1988 http adsabs.harvard.edu cgi bin nph data query?bibcode 1988ESOC...30..667R&link type ARTICLE&db key AST&high F. Roddier, C. Roddier, ESOC, 30, p.667, 1988 Category Sensors Category Optics Category Optical metrology ... more details
orphan date August 2010 Infobox company company name Wavefront Technology Solutions Inc. company logo ... Wavefront Heartbeat Moving Gif.gif right thumb 400px Powerwave s fluid pulse expands and contracts porous rock Wavefront Technology Solutions Inc. Tsxv WEE is one of North America s largest providers ... Statements ref The company was later changed to Wavefront Technologies and Environmental Services and then Wavefront Technology Solutions Inc. and is best http www.cantechletter.com 2010 10 jim letourneau on wavefrontwavefront technology solutionstsxvwee known for its patented technology that sends ... press room quick facts.html Wavefront Press Room Quick Facts ref Powerwave has already been used ... Chevron and Apache Corporation , among others. Wavefront Technology Solutions Inc. is headquartered ... also has offices in Houston , and Raleigh, North Carolina . History Wavefront Technology Solutions ... Prism Production Technologies Inc., Wavefront Environmental Technologies Inc., and E2 Solutions ... PE TECH Inc., from a privately held company to a publicly traded company under the name Wavefront ... was renamed Wavefront Reservoir Technologies Inc., Wavefront Environmental Technologies was rolled into Wavefront Reservoir Technologies Inc. and E2 Solutions Inc. was renamed Wavefront Energy ... was changed to Wavefront Technology Solutions Inc. Rationale Image Trapped Oil in soil.jpg right ... improved ref Products and Technologies Wavefront Technology Solutions s patented technology ... Oil Recovery ref Early iterations of Wavefront Technology Solutions s Power Pulse Technology ... In the energy sector, Wavefront Technology Solutions Inc. has patented the Power Pulse Technology ... Wavefront ready to flow revenue ref Powerwave utilizes this technology to improve the flow of water ... that the technology behind Powerwave has been developed by Wavefront Technologies and Environmental ... now is only one meter high and eight centimeters in diameter. Wavefront Technology Solutions Inc. leases ... more details
type code uniform type magic owner Wavefront Technologies released Start date YYYY mm dd df yes latest ... format MTL is a standard defined by Wavefront Technologies for ASCII files that define the light ... Wavefront .mtl file format info GRIPES and GRUMBLES Wings Wings3D Official Development Forum Message ..., libraries and example files DEFAULTSORT Wavefront .Obj File Category CAD file formats fr Objet 3D ... more details
Summary Non free use rationale Article Wavefront Technologies and Environmental Services Description This moving GIF image is taken from the Wavefront Technologies and Environmental Services promotional video to depict the Powerwave technology. There is no free alternative and it depicts exactly how the technology works. Source http onthewavefront.com Files Download Videos Video1 video1.html Portion The portion of the movie that is used runs from 2 50 3 07 in the length of the movie. Low resolution The movie was converted to a low resolution moving GIF version of the high resolution WMV file that it was taken from. There is no lower resolution available that would accurately portray the technology without losing quality. Purpose The purpose of this moving GIF is to show in extreme detail how the Powerwave technology works. Without this moving GIF, readers would not understand the technology. This moving GIF is essential to understanding the technology and without it Wikipedia would be losing valuable content. Replaceability This moving GIF could not be replaced or recreated without losing the value of the movie. other information Licensing Non free film screenshot ... more details
Summary Summary logo fur REQUIRED Article Wavefront Technology Solutions Inc. Use Org HIGHLY RECOMMENDED Source http www.onthewavefront.com images logo.gif ADDITIONAL INFORMATION Used for This is the corporate logo for Wavefront Technology Solutions, Inc. Owner Wavefront Technology Solutions, Inc. Website http www.onthewavefront.com History Commentary There is no commentary in the article about the logo OVERRIDE FIELDS Description This is the logo of Wavefront Technology Solutions, Inc. used to portray the company s logo. Portion The entire logo was used Low resolution This logo was taken at a low enough resolution where it cannot be duplicated online without loss. Purpose This logo is used on this Wikipedia page in order to show the reader exactly what Wavefront Technologies and Environmental Services logo is. Replaceability This image cannot be replaced with free use because Wavefront s logo isn t free use and never will be. other information This image is the entire logo and it is used to accurately represent Wavefront Technology Solutions, Inc. Licensing Non free logo ... more details
Unreferenced date October 2007 The Advanced Visualizer TAV , a 3D graphics software package, was the flagship product of Wavefront Technologies from the 1980s until the 1990s. It was made into an animator s package after the hype from movies The Abyss , Terminator 2 and Jurassic Park film Jurassic Park . When Microsoft purchased Softimage in an attempt to take over the 3D computer graphics market, Silicon Graphics purchased Alias Systems Corporation , a competitor of Wavefront, and their competitor from France, TDI Thomson Digital Images Explore, and created a super company called Alias Wavefront . Wavefront s programmers continued to reside in California but the management of the company was carried out in Toronto, Canada. In 1996 Alias Wavefront announced the release of Maya software Maya . Recently the company was renamed to Alias Systems Corporation Alias Technologies . When TAV was pulled from the market, Alias s representatives continued to peddle Alias Power Animator as a revolutionary animation package, though some artists were not impressed and had severe trouble producing animation exceeding the quality of TAV s Kinemation Fact date July 2009 . Category 3D graphics software graphics software stub ... more details
Cleanup date October 2010 Optical aberration In optics , piston is the mean value of a wavefront or Phase waves phase profile across the pupil of an optical system. The piston coefficient is typically expressed in wavelength s of light at a particular wavelength . Its main use is in curve fitting wavefronts with Cartesian polynomials or Zernike polynomials . However, similar to a real V8 engine piston moving up and down in its cylinder, optical piston values can be changed to Bias electrical engineering bias the wavefront phase mean value as desired. As phase values can only vary from zero to 2 , then repeat in either direction termed phase wrapping , changing the piston coefficient changes the zero phase value contour locations across the wavefront. This property is critical to the operation of phase measuring interferometers , which give not only the magnitude but also the sign wikt convexity convexity or wikt concave concavity of a wavefront under test. Piston is physically created in the interferometer by piezoelectric actuators that translate the Fizeau interferometer reference surface along the optical axis by precise fractions of the test wavelength, usually by one quarter of a wavelength. This changes the interferometric fringe patterns and allows direct calculation of the exact wavefront error. Piston and Tilt optics tilt are not actually true optical aberration optics aberrations , as they do not represent or model curvature in the wavefront. Defocus is the lowest order true optical aberration. If piston and tilt are subtracted from an otherwise perfect wavefront, a perfect, aberration free image is formed. References Malacara, D., Optical Shop Testing Second Edition , John Wiley and Sons, 1992, ISBN 978 0 471 52232 4. DEFAULTSORT Piston Optics Category Optics ... more details
Summary Non free use rationale Article Wavefront Technologies and Environmental Services Description This is a picture of an early prototype of the Pressure Pulse Tool. There is most definitely no free version of this image. Source Nickles New Technology Magazine July 1999. Good Vibrations Portion This is about half of the cover of the magazine article. Low resolution This is a very low resolution version of the picture. Purpose It shows an early prototype that the reader of this article would be very interested in seeing to see the timeline of Wavefront Technologies products. Without this picture the article would not be complete. Replaceability This picture could not be replaced by a free use version. other information ... more details
of Shack Hartmann Wavefront Sensing journal Journal of Refractive Surgery volume 17 year ... of the wavefront error using spot displacement in sensor plane, Pamplona et al. make the user shift ... http www.metrolux.de contenido cms wavefront sensor Metrolux GmbH http www.optocraft.com OPTOCRAFT ... WaveFront Sciences http www.imagine optic.com Imagine Optic http www.pulstec.co.jp en index.html ... more details
Kinemation was one of the first inverse kinematics packages for 3D computer animation , created for Wavefront Technologies package The Advanced Visualizer TAV . In 1995, Wired magazine Wired described Kinemation as a huge breakthrough in motion animation ref cite journal title The New Hollywood author Paula Parisi journal Wired issue 12 volume 3 month December year 1995 url http www.wired.com wired archive 3.12 new.hollywood pr.html ref . It was used in the mid 1990s by companies such as Kleiser Walczak Construction Company Judge Dredd film Judge Dredd . Portions of Kinemation were disassembled and re assembled into Alias Systems Corporation Alias Wavefront s flagship product Maya software Maya . References references External links http www.oldcliche.com movies Thorax.mpeg An Animation That Was made in 1995 with Kinemation, pre Maya http www.kwcc.com Kleiser Walczak Studios Category Robotics Category Computer graphics graphics software stub ... more details
RLA may refer to any of the following Residual Life Assessment , in power plant. Railway Labor Act , an United States American law governing labour relations in the railway and airline industries. The International Air Transport Association airport code IATA code for Rolla Downtown Airport in Rolla, Missouri Rolla , Missouri , United States . Restricted Landing Area , an United States American type of private or otherwise limited use aerodrome . Right Livelihood Award RLS filetype RLS Run Length Encoded Version A is a proprietary, library type graphics file format, developed by Wavefront Technologies Wavefront . The Rod Laver Arena in Melbourne , Australia . The Royal Lao Army , the armed forces of the Kingdom of Laos . Russian Liberation Army during WWII. Rated Load Amphere . disambig Category Initialisms de RLA it RLA ... more details
to correct wavefront errors in an astronomical telescope. Adaptive optics AO is a technology used to improve the performance of optics optical systems by reducing the effect of wavefront distortions. It is used ... the distortions in a wavefront and compensating for them with a spatial phase modulator Clarify ... tilts of the wavefront in two dimensions equivalent to correction of the position offsets for the image .... File Shack hartmann.png thumb The Shack Hartmann Shack Hartmann sensor is one type of wavefront ... of these spots from known reference positions indicate the local slopes of the wavefront. These local slopes, in turn, are used to reconstruct the overall shape of the wavefront in wavefront ... , using a wavefront sensor which takes some of the astronomical light, a deformable mirror that lies in the optical path, and a computer that receives input from the detector. The wavefront sensor ... s in a wavefront sensor, either using an array of small lenslet s a Shack Hartmann sensor , or using a curvature or pyramid sensor which operates on images of the telescope aperture. The mean wavefront ... mirror and used to correct the wavefront errors introduced by the atmosphere. It is not necessary ... which are not point like can be used in a Shack Hartmann wavefront sensor, and time varying structure ... , which then appear to glow . The LGS can then be used as a wavefront reference in the same ... Space Telescope . In retinal imaging Ocular aberrations are distortion s in the wavefront passing ... es. In the case of retinal imaging, light passing out of the eye carries similar wavefront distortions ... Optical aberration Ocular aberrations are generally measured using a wavefront sensor , and the most commonly used type of wavefront sensor is the Shack Hartmann . Ocular aberrations are caused by spatial phase nonuniformities in the wavefront exiting the eye. In a Shack Hartmann wavefront sensor ..., and the displacements between the two are used to determine the local curvature of the wavefront ... more details
Unreferenced date January 2007 A lenslet is literally a small Lens optics lens . The fact that distinguishes it from a small lens is that it is part of a lenslet array. A lenslet array consists of a set of lenslets in the same plane. Each lenslet normally has the same focal length . It has many uses but is commonly found in Shack Hartmann wavefront sensor s and beam homogenization optics for projection systems. optics stub Category Optics ... more details
Obj or OBJ may refer to Object file , an organized machine code file created by a compiler with .obj file extension Relocatable Object Module Format , an Object file for Intel microprocessors with .obj file extension Wavefront .obj file , a 3D geometry definition file format with .obj file extension OBJ programming language , a programming language family developed in 1976 Olusegun Obasanjo , former President of Nigeria Disambig eo OBJ ru OBJ ... more details
Summary This is a resized version of a picture that was taken from a scanned version of the article entitled Good Vibrations from the Nickles New Technology Magazine published in July 1999. Fair Use Rationale This photo is used consistent with Wikipedia fair use guidelines to illustrate the object in question. It is believed there will never be a freely licensed version of this photograph. License Non free fair use in Wavefront Technologies and Environmental Services ... more details
A resized version of the http www.onthewavefront.com Files IR Financials 2009 First 20Quarter 20Financial 20Statements.pdf Powerwave taken from the 2008 First Quarter Financial reports . Fair Use Rationale This photo is used consistent with Wikipedia fair use guidelines to illustrate the object in question. It is believed there will never be a freely licensed version of this photograph. This photograph was taken to illustrate the small size of the Powerwave and without the picture the article would be incomplete. License Non free fair use in Wavefront Technologies and Environmental Services ... more details
In electromagnetic wave wave propagation propagation , the knife edge effect or edge diffraction is a redirection by diffraction of a portion of the incident radiation that strikes a well defined obstacle such as a mountain range or the edge of a building. The knife edge effect is explained by Huygens Fresnel principle , which states that a well defined obstruction to an electromagnetic wave acts as a secondary source, and creates a new wavefront . This new wavefront propagates into the geometric shadow area of the obstacle. The knife edge effect is an outgrowth of the half plane problem, originally solved by Arnold Sommerfeld using a plane wave spectrum formulation. A generalization of the halfplane problem is the wedge problem, solvable as a boundary value problem in cylindrical coordinates. The solution in cylindrical coordinates was then extended to the optical regime by Joseph B. Keller , who introduced the notion of diffraction coefficients through his geometrical theory of diffraction GTD . Pathak and Kouyoumjian extended the singular Keller coefficients via the uniform theory of diffraction UTD . FS1037C MS188 External links http www.mike willis.com Tutorial diffraction.htm Mathematical details See also Radio propagation Diffraction Radio propagation Analogue TV transmitter topics Category Radio frequency propagation ... more details
Unreferenced date December 2006 Image Vergence.svg thumb right Vergence of a beam. The vergence is inversely proportional to the distance from the focus in metres. If a positive lens is focussing the beam it has sit left of the focus, while a negative lens has to sit right of the focus to produce the appropriate vergence Otheruses Vergence disambiguation The vergence typical symbol L of a Ray optics light bundle in optics is the reciprocal of the distance between the focus optics point of focus and a reference plane. It is measured in dioptre s 1 D 1 m sup 1 sup . Vergence can also be understood as a measure of the curvature of the optical wavefront . However, it is only fully valid in geometrical optics , not in Gaussian beam optics or in wave optics where the wavefront at the focus is wavelength dependent and the curvature is not proportional to the distance from the focus. Convergence describes the situation when the light rays are approaching each other and its values are positive. Divergence is measured as negative dioptres and means that the beams are originating from a point. See also Optical power Optical resolution Cardinal point optics Radius of curvature optics DEFAULTSORT Vergence Optics Category Geometrical optics Optics stub de Vergenz Optik fr Vergence pl Zdolno zbieraj ca uk adu optycznego ... more details
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