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The image dissector has no " charge storage " characteristic ; the vast majority of electrons emitted by the photocathode are excluded by the scanning aperture, and thus wasted rather than being stored on a photo-sensitive target, as in the iconoscope or image orthicon ( see below ), which largely accounts for its low light sensitivity.
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image and dissector
Video camera tubes in the early days of television used the photoelectric effect, for example, Philo Farnsworth's " Image dissector " used a screen charged by the photoelectric effect to transform an optical image into a scanned electronic signal.
Although he made many contributions that were crucial to the early development of all-electronic television, he is perhaps best known for inventing the first fully functional all-electronic image pickup device ( video camera tube ), the " image dissector ", the first fully functional and complete all-electronic television system, and for being the first person to demonstrate such a system to the public.
* Germany experiments with a flying bomb guided by a television camera, created by Fernseh, using both the Superikonoscope and the Farnsworth image dissector.
Behind this grid system, an image dissector tube ( photomultiplier type detector ) with a sensitive field of view of about 38 arc-sec diameter converted the modulated light into a sequence of photon counts ( with a sampling frequency of 1200 Hz ) from which the phase of the entire pulse train from a star could be derived.
Other hardware components were supplied as follows: the beam-combining mirror from REOSC at Saint Pierre du Perray ; the spherical, folding and relay mirrors from Carl Zeiss AG in Oberkochen ; the external straylight baffles from CASA in Madrid ; the modulating grid from CSEM in Neuchatel ; the mechanism control system and the thermal control electronics from Dornier Satellite Systems in Friedrichshafen ; optical filters, the experiment structures and the attitude and orbit control system from Matra Marconi Space in Velizy ; instrument switching mechanisms from Oerlikon-Contraves in Zurich ; the image dissector tube and photomultiplier detectors assembled by the Dutch Space Research Organisation, SRON in The Netherlands ; the refocusing assembly mechanism designed by TNO-TPD in Delft ; the electrical power subsystem from British Aerospace in Bristol ; the structure and reaction control system from Daimler-Benz Aerospace in Bremen ; the solar arrays and thermal control system from Fokker Space System in Leiden ; the data handling and telecommunications system from Saab Ericsson Space in Gothenburg ; and the apogee boost motor from SEP in France.
Stars were observed as the satellite rotated, by a sensitive region of the image dissector tube detector.
* September 7-Philo Farnsworth's electronic image dissector television camera tube transmits its first image at his laboratory at 202 Green Street in San Francisco.
All-electronic designs based on the cathode ray tube, such as Vladimir Zworykin's Iconoscope and Philo T. Farnsworth's Image dissector, supplanted the Baird system by the 1940s and remained in wide use until the 1980s, when cameras based on solid-state image sensors such as CCDs ( and later CMOS active pixel sensors ) eliminated common problems with tube technologies such as image burn-in and made digital video workflow practical.
An image dissector is a camera tube that creates an " electron image " of a scene from photocathode emissions ( electrons ) which pass through a scanning aperture to an anode, which serves as an electron detector.
The term may apply specifically to a dissector tube employing magnetic fields to keep the electron image in focus, an element lacking in Dieckmann and Hell's design, and in the early dissector tubes built by American inventor Philo Farnsworth.
Their experiments on the image dissector were announced in the volume 8 ( September 1927 ) of the popular magazine Discovery and in the May 1928 issue of the magazine Popular Radio.
The introduction of a multipactor in October 1933 and a multi-dynode " electron multiplier " in 1937 made Farnsworth's image dissector the first practical version of a fully electronic imaging device for television.
The optical system of the image dissector focuses an image onto a photocathode mounted inside a high vacuum.
Unlike the Farnsworth image dissector, the Zworykin iconoscope was much more sensitive, useful with an illumination on the target between 4ft-c ( 43lx ) and 20ft-c ( 215lx ).
The production and commercialization of the super-Emitron and image iconoscope in Europe were not affected by the patent war between Zworykin and Farnsworth, because Dieckmann and Hell had priority in Germany for the invention of the image dissector, having submitted a patent application for their Lichtelektrische Bildzerlegerröhre für Fernseher ( Photoelectric Image Dissector Tube for Television ) in Germany in 1925, two years before Farnsworth did the same in the United States.
image and has
Thus the image of man has suffered complete fragmentation in personal and spiritual qualities, and complete objectification in sub-human and quasi-mechanistic powers.
My memory has catalogued for easy reference and withdrawal the image of her pink, scented stationery and the unsloped, almost printed configurations of her neat, studious handwriting with which she invited me to recall our summer, so many sentences beginning with `` Remember when ; ;
Hence, thought of as a line in a particular plane **yp, any tangent to Q has a unique image and moreover this image is the same for all planes through L.
Since C is rational, this correspondence has K coincidences, each of which implies a line of the pencil which meets its image.
For any pencil in a plane containing a Af-fold secant of **zg has an image regulus which meets the plane of the pencil in Af lines, namely the images of the lines of the pencil which pass through the intersection of **zg and the multiple secant, plus an additional component to account for the intersections of the images of the general lines of the pencil.
It has been truly said that anything man can imagine he can produce or create by projecting this inner image into its counterpart in the objective world.
In their case, the god of this world ( Satan ) has blinded their unbelieving minds, that they should not see the light of the gospel of the glory of Christ, who is the image of God.
In Western countries, a bead frame similar to the Russian abacus but with straight wires and a vertical frame has been common ( see image ).
Because CCD imagers are linear, image processing may be used to subtract away the effects of light pollution, which has increased the popularity of astrophotography in urban areas.
The issue has been further complicated by historical revisionists, who have tried to improve the image of the South by lessening the role of slavery.
For every group G there is a natural group homomorphism G → Aut ( G ) whose image is the group Inn ( G ) of inner automorphisms and whose kernel is the center of G. Thus, if G has trivial center it can be embedded into its own automorphism group.
However, slow phosphor has the negative side-effect of causing image smearing and blurring when there is a large amount of rapid on-screen motion occurring.
An image of the Indian rhinoceros, the image has such force that it remains one of his best-known and was still used in some German school science text-books as late as last century.
Strictly speaking, it refers to art unconcerned with the literal depiction of things from the visible world — it can, however, refer to an object or image which has been distilled from the real world, or indeed, another work of art.
Whilst providing a projected image, the technique has limited resolution ( 2-2. 5 nm ), due to both quantum mechanical effects and lateral variation in electron velocity.
Maland has identified it as triggering Chaplin's decline in popularity, and writes, " Henceforth, no movie fan would ever be able to separate the dimension of politics from the star image of Charles Spencer Chaplin.
A theme in the development of this field has been to duplicate the abilities of human vision by electronically perceiving and understanding an image.
This version of rasterization has overtaken the old method as it allows the graphics to flow without complicated textures ( a rasterized image when used face by face tends to have a very block-like effect if not covered in complex textures ; the faces are not smooth because there is no gradual color change from one primitive to the next ).
Of all the living creatures we know, humanity alone, created in His image and endowed with free will, has been singled out to be the recipient and bearer of Revelation.
Marker begins the film with the Odessa Steps sequence from Sergei Eisenstein's film The Battleship Potemkin, which Marker points out is a fictitious creation of Eisenstein which has still influenced the image of the historical event.
In 2D computer animation, moving objects are often referred to as “ sprites .” A sprite is an image that has a location associated with it.
image and no
Time plays an essential part in our mortality, and suddenly for no reason he could imagine ( or admit ) the image of Peg laughing filled his mind -- so desirable, so lusty, so full of nuances of pleasure and joy.
A final class of exceptional lines is identifiable from the following considerations: Since no two generators of Af can intersect, it follows that their image curves can have no free intersections.
However, if there is no additional complex of singular lines, the order of the image regulus of a pencil is precisely Af.
there is no phrase or image that sounds like Hardy or that is striking enough to give individuality to the poem.
Every dream, and this is true of a mental image of any type even though it may be readily interpreted into its equivalent of wakeful thought, is a psychic phenomenon for which no explanation is available.
The entire concept of cerebral imagery as the physical basis of a mental image can find no logical support.
There is no justification for systematizing the random statements of Irenaeus about the image of God beyond this, nor for reading into his imprecise usage the later theological distinction between the image of God ( humanity ) and the similitude of God ( immortality ).
Aphrodite had no childhood: in every image and each reference she is born as an adult, nubile, and infinitely desirable.
The first Abstract Expressionists were considered madmen to give up their brushes and rely on the sheer force of energy to leave an image, but then the import of atomic bombs, all atomic energy, became realized, and art found no better way of expressing its power.
We receive, therefore, in no single intercepting plane behind the system, as, for example, a focusing screen, an image of the object point ; on the other hand, in each of two planes lines O ' and O " are separately formed ( in neighboring planes ellipses are formed ), and in a plane between O ' and O " a circle of least confusion.
A crucifix ( from Latin cruci fixus meaning "( one ) fixed to a cross ") is an independent image of Jesus on the cross with a representation of Jesus ' body, referred to in English as the corpus ( Latin for " body "), as distinct from a cross with no body.
Unlike in many other European countries, the general image of Święty Mikołaj in Poland is basically no different to the one of the Anglo-Saxon Santa Claus ( he is said to live in the North Pole, wear red clothes and a white beard, use reindeers to pull his sleigh, or enter houses via the chimney ).
On June 11, 2011 various bugs of the Debian-installer based image were fixed, there is no known issue except that GNOME and KDE are not installable yet.
If all layers of an image change regularly but a large number of layer still need to be composited ( such as in distributed rendering ), the commutativity of a compositing operator can still be exploited to speed up computation through parallelism even when there is no gain from pre-computation.
Using camera obscura, it was possible to project a moving image, but there was no means of recording the image for later viewing.
This image has no display of an axe or a strong central state ; rather, it symbolizes the power of the liberated people by placing the Liberty Cap on top of the classical symbol of power.
According to Alan Reid's account, Erwin had no concerns about policy — his anxiety was entirely focussed on Holt's leadership style, his parliamentary performance and his public image.
It has been suggested that the image portrays Hannibal as Melqart, however there are no known authentic images of Hannibal and there is no proof that even Carthaginian coins such as this one show his likeness.