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Alluxa - Optical Coatings LB 8/23
tube Dictionary Terms

spectroscopic light source
A discharge tube filled with various gases and used as a source in spectroscopy.
image orthicon
A camera tube widely used in television broadcasting. It consists of three sections within a single vacuum envelope. 1. A...
cathode-ray tube deflection plane
A plane that lies at right angles to the tube axis that has the deflection center.
focal collimator
A collimator having, at one end of a tube, an objective lens, and at the other, a reticle with a pair of spaced lines...
Stark effect
The splitting or shifting of spectral lines or energy levels caused by the application of a strong transverse electrical...
cathode-ray tube pattern
The luminous trace formed on the cathode-ray tube screen by the motion of the electron beam.
data analysis display
An accurate cathode-ray tube display used to provide visual representation stored in a computer for the interpretation and...
flashtube
electron-beam gun
1. A device generally used in a cathode-ray or camera tube to emit a stream of electrons moving at uniform velocity in a...
electro-optic Fabry-Perot spectroscopy
The spectroscopic analysis of interference patterns using an electronic imaging tube with a Fabry-Perot interferometer to...
photoemissive detector
An electronic tube instrument in which the anode current varies with the intensity of light incident on the cathode.
gas current
The positive ion current created in an electron tube as a result of the collisions between electrons and residual gas...
electronic flash unit
A small xenon-filled tube with metal electrodes fused into the ends. The gas flashes brilliantly when a condenser is...
photoelectric tube
cathode glow
The apparent luminosity or glow that immediately envelops the cathode in a gas-discharge tube operating at low pressures....
electrochromic display
Type of solid-state display tube in which the readout surface is coated with a material that changes color when positively...
electron scanning
The deflection of a beam of electrons, at regular intervals, across a cathode-ray tube screen, according to a definite...
focus control
1. A mechanism that permits the focusing of an optical system.2. A means of obtaining the sharpest image from a cathode-ray...
incandescent lamp
A lamp that emits light when an electric current passes through a resistant metallic wire situated in a vacuum tube.
thermionic diode
A diode electron tube that contains a heated cathode.
mercury vapor light source
A lamp that has mercury in a tube or bulb that has first been evacuated. The electricity travels through the vapor between...
gas magnification
The increase in current of a phototube as a result of the gas in the tube becoming ionized.
ferrule
A mechanical fixture, generally a rigid tube, used to confine the stripped end of a fiber or a fiber bundle.
parallelogram distortion
In a camera or cathode-ray tube, distortion that is designated by a lateral skewing of the reproduced image.
Laurent polarimeter
A Laurent polarimeter is an instrument used in optics for measuring the rotation of plane-polarized light caused by...
excimer laser coronary angioplasty
Excimer laser coronary angioplasty (ELCA) refers to a medical procedure used in the treatment of coronary artery disease....
filament transformer
A transformer that is designed to regulate the amount of current that passes through an electron tube's filament.
electron-beam recording
The recording of the information contained in a modulated electron beam onto photographic or silicon resin-coated materials....
wafer tube
An image intensifier tube in which the photocathode and the output of the microchannel plate are proximity-focused on the...
Plumbicon
Philips trade name for a lead oxide low-light-level vidicon tube.
beam positioner
A device (e.g., prisms, lenses, tubes) used to align a beam in a system.
ion laser
A laser in which the transition involved in stimulated emission of radiation takes place between two levels of an ionized...
microchannel plate
A microchannel plate (MCP) is a specialized electron multiplier device used in various applications such as particle...
night-vision device
A device that uses low-level visible radiation or infrared radiation to produce a visual image of a night scene. These...
visual storage tube
An electron tube that stores and visually displays information by means of a cathode-ray-beam-scanning and charge-storage...
bolometer
A thermometric instrument used for the detection and measurement of radiant energy. Its essential component is a short...
addressability
In display technology, an expression of resolution given by the number of pixels in both the horizontal and the vertical...
fiber optic window
The face of a cathode-ray tube (CRT) that has a fiber optic sheet attached to its surface. The sheet's fibers are at right...
triode
An electron tube with an anode, a cathode and a regulating electrode (grid).
filament emission
The freeing of electrons from a filament in an electron tube as the result of the filament being heated by an electric...
field emission display
An X-Y electrically addressable series of arrays with individual electron emitters bombarding a phosphor-coated transparent...
phototube
An electron tube having a photocathode for the emission of a photoelectric current.
Lissajous pattern
The pattern, formed by a character generation cathode-ray tube system, in which the characters are made up of wave shapes...
oscilloscope
A system in which a supplied signal causes the deflection of the electron beam in a cathode-ray tube, thus forming a visible...
stroboscopic light source
An electronic flash tube capable of repeated operation at hundreds or thousands of flashes per second for long periods.
aperture mask
Also known as a shadow mask, a perforated plate placed between the focusing and accelerating electrodes, and the tricolor...
Wehnelt cylinder
Also known as cathode-ray tube grid or shield. A cylindrically shaped electrode that, containing the cathode of a...
negative glow
In a cold-cathode tube, the luminance between the cathode dark space and the Faraday dark space. In a vacuum tube, the...
spectroscopic flash
The light flash, produced in flash photolysis, that is triggered within a second discharge tube by the third electrode. It...
mercury arc
An electric arc that is formed in mercury vapor through which an electric current flows. The intensity of the illumination...
channel electron multiplier
A photoelectric detector consisting of a glass tube internally coated with a low conductance material. Voltage applied along...
photodetector
A photodetector, also known as a photosensor or photodiode, is a device that detects and converts light into an electrical...
diaphragm
A flanged or plain ring with a restricted aperture, located in an optical system at any of several points, that cuts off...
spectral flow cytometry
Spectral flow cytometry is an advanced flow cytometry technique that expands the capabilities of traditional flow cytometry...
detector array
A detector array refers to a collection of individual detector elements arranged in a two-dimensional grid or matrix format....
fiber optic preform
A fiber optic preform is a cylindrical glass rod or tube used as the starting material for manufacturing optical fibers. It...
inside vapor-phase oxidation
A method that produces low-loss optical fibers. A glass tube rotates while reactants pass through the tube and heat is...
phototube relay
A photoelectrical relay that uses a phototube as its photoelectric device to open and close an electrical relay; used to...
scintillation crystal
A scintillation crystal, also known simply as a scintillator, is a material that emits light when it interacts with ionizing...
power scanning laws
Laws that predict the maximum power output as a function of tube diameter for a hydrogen cyanide laser of a given discharge...
sealed-off
Describing a laser in which the gas is permanently sealed within the tube.
scintillation detector
A scintillation detector is a radiation detection device that utilizes scintillation crystals to detect and measure ionizing...
stroboscope
A device that produces brief flashes of light for observing the behavior of an object during a short interval. One of the...
image iconoscope
A camera tube similar in design to the iconoscope. However, the image formed in the image iconoscope is projected on a...
photoelectric multiplier
A phototube in which the primary photoemission current, before being extracted at the anode, is multiplied many times.
cathode-ray tube grid
lag
A term applied to an electric charge image in a camera tube that remains for a period of a few frames after its initial...
cathode
1. The negative electrode of a device in an electrical circuit. 2. The positive electrode of a primary cell or storage...
double-beam CRT
A cathode-ray tube that either splits an electron beam from one source or uses beams from two sources to produce two beams,...
camera
A light-tight box that receives light from an object or scene and focuses it to form an image on a light-sensitive material...
fused quartz and silica
Fused quartz and silica are closely related materials, both composed primarily of silicon dioxide (SiO2), but they are...
photomultiplier tube
A photomultiplier tube (PMT) is a highly sensitive vacuum tube that detects and amplifies low levels of light. It is widely...
electron image tube
A cathode-ray tube that increases the brightness or size of an image or forms a visible image from invisible radiation. The...
beamsplitter
A beamsplitter is an optical device for dividing a beam into two or more separate beams. A simple beamsplitter may be a very...
ondoscope
A glow discharge tube placed on an insulating rod to detect the presence of high-frequency radiation in the vicinity of a...
cathode-ray tube envelope
Envelopes for cathode-ray tubes are made by blowing glass in the same manner as light bulbs. They have a fairly flat end...
nanotube
A nanotube, also known as a nanotubule or simply a tube-like structure, is a nanoscale cylindrical structure composed of...
image isocon
A television camera tube that preceded the development of the vidicon tube and incorporated a method to separate reflected...
deflection yoke
A metal coil or coils wrapped around the outside of the neck of a cathode-ray tube. Current passing through the coils...
xenon arc
The arc formed when the rare gas xenon is excited electrically and emits a brilliant white light. Xenon is used to fill...
Y-axis deflection
The vertical deflection of an image on a cathode-ray tube screen.
illuminated table
A desklike apparatus with an opal glass surface illuminated from beneath by fluorescent tubes. It is equipped with roll...
mask
1. A framelike structure that serves to restrict the viewing area of the screen when placed before a television picture...
hard tube
vacuum gauge
A gauge designed to measure the degree of vacuum in an evacuated vessel. A simple U-tube containing mercury is adequate for...
anode
The part of an electrical circuit in which the electrons leave (a cathode-ray tube) or enter (an electrolytic cell) a unit...
gas phototube
A phototube having increased response due to the addition of a quantity of gas.
high-vacuum tube
An electron tube whose electrical characteristics will not be affected by gaseous ionization because of its high degree of...
x-ray image intensifier
An image intensifier that consists of an evacuated tube with a large input phosphor screen at one end. The phosphor screen...
envelope
Also referred to as a bulb. The glass housing that encloses an incandescent source, or the glass or metal housing that...
crater lamp
A glow-discharge tube in which the discharge takes place in the conical or crater-shaped depression at one end of the tube.
cathode-ray tube
A vacuum tube with an electron gun at one end and a fluorescent screen at the other. Electrons emitted from a heated...
oscillograph
An instrument used to record rapidly varying currents or voltages. An oscillograph may consist of a cathode-ray tube...
Geiger counter
Also called Geiger-Müller counter. An instrument designed to detect and measure radioactivity through the use of a...
Jamin refractometer
An instrument designed to measure the index of refraction of a gas by the interference patterns formed by two beams, one of...
positron emission tomography
A medical imaging device that uses a ring of crystal/photomultiplier tube assemblies encircling the patient to detect gamma...
photoelectric fluorometer
A filter fluorometer that uses a photomultiplier tube to detect the fluorescence of a sample.
magneto-optic readout device
A device using the Kerr effect to read back the signals from mechanically recorded tapes and discs. It consists of a light...
microwave phototube
A device designed to detect microwave modulation and to mix modulated and unmodulated laser beams. It consists of a...
unblanking
The initiation of the beam in a cathode-ray tube.
electrodeless discharge tube
A device consisting of an airtight quartz tube that holds the material to be analyzed. When a high-frequency electrostatic...
uniform luminance area
In a cathode-ray tube, the region wherein a display on the tube keeps 70 percent or more of its luminance at the center of...
short-flash light source
An electronic flash tube in which the flash recurs at a frequency extending to many thousands per second. A stroboscopic...
laser lithotripsy
Laser lithotripsy is a medical procedure that uses laser energy to break down or fragment stones in various parts of the...
fullerenes
Molecules composed entirely of carbon, in the form of a hollow sphere, ellipsoid or tube. Also called buckyballs....
lens mount
The metal tube that maintains the optical components of a lens in proper relationship. Some lenses are mounted in metal...
orthicon
A television camera tube in which a low-velocity electron beam scans a photoactive mosaic that has been created by an...
minimum object distance
Minimum object distance, often abbreviated as MOD, refers to the closest distance at which a camera lens or optical system...
focus
1. The focal point. 2. To adjust the eyepiece or objective of a telescope so that the image is clearly seen by the observer....
cascade tube
An instrument consisting of a high-voltage vacuum tube used to form hard x-rays or high-speed ion beams. By partitioning the...
display
The observable illustration of an image, scene or data on a screen such as a console or cathode-ray tube, seen as a graph,...
ultrasonic imaging
The formation and display of three-dimensional images by ultrasonic energy. In one technique, the energy pulses from an...
image intensifier
An image intensifier, also known as an image intensification tube or image intensification device, is a specialized...
electron emitter
In a cathode tube, the electrode that serves as a source for electrons.
electron power tube
An electron-beam tube with power-handling capability that is essentially based on controlled electron beams. Its control and...
xenon flashtube
A high-intensity source of incoherent white light in which a capacitor is discharged through a tube of xenon gas; often used...
proximity-focused image tube
A planar photocathode and a planar phosphor screen mounted in a close-spaced parallel configuration in an evacuated...
electrostatically focused image tube
An image intensifier that uses electrostatics to amplify and focus the electronic image.
photostore
The photographic recording of data, in binary form, for storage in memory. Exposure is achieved by a cathode-ray tube or by...
overscanning
In a cathode-ray tube, the deflection of the beam of the tube over an angle that surpasses the angle that subtends the...
snooperscope
An instrument used for viewing in low levels of illumination by means of infrared radiation. A high-aperture lens forms an...
tetrode
An electron tube that has an anode, a cathode, a control electrode and another electrode (usually a screen grid).
dual laser
A gas laser equipped with Brewster windows and concave mirrors (having unlike reflective properties) at each end of the tube...
intensity modulation
The process in which the electron beam of a cathode-ray tube varies in intensity in accordance with the magnitude of the...
fluorescent light source
A tube containing mercury vapor and lined with a phosphor. When current is passed through the vapor the strong ultraviolet...
vacuum phototube
A phototube that functions within a vacuum and thus eliminates the effects of gaseous ionization on its electrical...
pulse video thermography
A noncontact, nondestructive method of measuring defects in thin composite materials, using a xenon flashtube to generate...
stencil CRT image generation
The projection of the image beam by a cathode-ray tube through a mask, where it is deflected through the suitable character...
cathode-ray tube faceplate
A fiber optic end plate constructed by drawing a bundle of parallel fibers embedded in glass and cutting it into thin...
scintillation counter
An instrument designed to measure radiation indirectly through the use of several phosphors and a photomultiplier tube. The...
television microscope
A device designed to enlarge the image of a microscopic object by television process. It may be a flying spot scanner that...
cathode sputtering
The method of disintegrating the substance of the cathode by bombarding it with ions and depositing it on another electrode...
cathode dark space
The area of low-level luminance lying between the cathode and the negative glow in a glow-discharge, cold-cathode tube.
image tube camera
A camera system in which the image formed on the fluorescent screen of an image converter tube in the system is recorded by...
strobotron
A specified cold-cathode gas tube used to apply a short-duration, high-power arc for a stroboscope.
wavelength shifter
A photofluorescent compound that, when used with a scintillating substance, absorbs photons and emits related photons having...
halation
1. In a cathode-ray tube, the glow surrounding a bright spot that appears on the fluorescent screen as the result of the...
gas tube
An electron tube whose current flow is affected by the pressure on the gas or vapor contained in the tube.
electrostatic focus
The use of an applied electrical field to focus a cathode-ray tube's electron beam.
sonde
A ruggedized scintillation counter used in oil well logging. The cylindrical housing contains a gamma ray source, a...
single-walled carbon nanotubes
Referred to as SWCNTs, these cylindrical nanostructures composed of a folded sheet of graphene can be used as near-infrared...
biplanar image tube
Also called proximity focus image intensifier. A compact image intensifier that utilizes a microchannel plate...
intensified charge-coupled device camera
An intensified charge-coupled device (ICCD) camera is an advanced imaging device that combines the capabilities of both an...
vertical-deflection electrodes
Two electrodes that shift the electron beam vertically on a cathode-ray tube screen using electrostatic deflection.
phosphor dots
Very small phosphor particles present on the screen of a picture tube.
cathode stream
Also known as cathode rays. Formerly, this term described a stream of electrons emitted from the cathode of a gas-discharge...
photoelectric current
The electron stream emitted by a phototube when the cathode is exposed to light.
cathode-ray graphic display
A cathode-ray tube, driven by a computer, that receives impulses of information from the computer and displays it in a...
camera tube
The electron beam tube of a television camera that converts an optical image into a pattern of electrostatic charges and...
electromagnetic lens
An electron lens consisting of a homogeneous axial electric field and a magnetic field used in high-quality image tubes for...
cathode-ray tube shield
 laser tube
The device, usually made of glass or a similar material, that contains the resonant cavity and optics of a gas laser.
deflection circuit
The circuit that regulates an electron beam's deflection in a cathode-ray tube.
analog stroke
An analog method of moving a cathode-ray tube beam across a display screen face, commonly used in high-performance vector...
helium-neon laser
A helium-neon (HeNe) laser is a type of gas laser that emits visible red light at a wavelength of 632.8 nm. It operates...
blown fiber
A technique developed by British Telecom in which the viscous drag of air is used to install optical fibers in narrow...
quality area
The region of the cathode-ray tube phosphor screen restricted by the tube and instrument specification.
flying spot microscope
A microscope that uses a flying spot scanner, directed through the eyepiece, as a light source to determine the features of...
Aston dark space
In the discharge of a vacuum tube, the narrow, nonluminous region that sometimes may be found between the cathode and its...
flying spot
The moving spot of light emitted by a source, generally a cathode-ray tube, to illuminate specific points of an area...
electrostatic image dissector
A nonmagnetic instrument utilizing an electrofocus and deflection tube with a photocathode for imaging purposes. The optical...
gamma correction
Modification of a system to provide for a linear transfer characteristic from an input to an output device. A circuit for...
magnetically focused image tube
A vacuum tube in which a magnetic field is superimposed onto the tube's electrical field. When the two fields are aligned,...
cathode radiant sensitivity
Cathode radiant sensitivity refers to the ability of a photocathode to convert incident radiant energy, typically in the...
loose-tube buffering
In fiber optic cable, containment of the fiber or fibers within an outer protective tube in which they can move to some...
aluminized cathode-ray tube
A cathode-ray tube having a screen that is coated on the back with a thin film of aluminum, which serves to intensify the...
remote display unit
A display device, such as a cathode-ray tube, that is located at some distance from the source generating the displayed...
photoelectric photometer
Also known as electronic photometer. A photometer with a photocell, phototransistor or phototube for measuring the intensity...
ultraprecision cathode-ray tube display
A highly accurate cathode-ray tube used to display information with the utmost efficient stability and resolution. The...
graphene
Graphene is a two-dimensional allotrope of carbon consisting of a single layer of carbon atoms arranged in a hexagonal...
neon indicator tube
A cold-cathode tube containing neon and designed to visually determine a potential difference or field.
revolving lens fiber optic scanner
A sequential scanning device, utilizing a revolving lens, in which the cathode-ray tube image is transformed into a circle...
bore
The central hole running the full length of a laser capillary tube, in which electrical discharge and laser action take...
oculometer
An electro-optical infrared tracker consisting of a beamsplitter, an illuminating source, an image dissector tube and an...
stroke pattern
The pattern formed by a character generation cathode-ray tube system, in which the characters are composed of a sequence of...
hard copy
Text or images printed on paper or another tangible medium, as opposed to those viewed electronically on a cathode-ray-tube...
direct-view storage tube
A cathode-ray tube in which secondary emission electrons form a display of high intensity.
color comparator
1. A device used in chemistry to compare the colors of solutions held in flat-bottomed tubes and viewed along the length of...
camera tube target
The storage surface of an electron beam tube that is scanned by an electron beam to generate an output-signal current...
fluorescent screen
A fluorescent screen refers to a phosphorescent or fluorescent-coated surface that emits visible light when exposed to other...
microscope eyepiece
An eyepiece located at the near end of the microscope tube. It often is a simple Huygens eyepiece, but compensating and...
Z-axis modulation
The intensity regulation of a cathode-ray tube by alteration of the grid-cathode voltage.
in vitro
In vitro is a Latin term that translates to "in glass." In scientific contexts, particularly in biology and medicine, it...
electromagnetic image tube
An image intensifier tube that uses a magnetic field for focusing. It yields high-quality images, but its use is limited by...
ionic focusing
Also known as gas focusing. The introduction of an inert gas into a cathode-ray tube for the concentration of the electron...
excitron
A single-anode mercury pool tube that is designed to maintain a continuous cathode spot.
Faraday dark space
The nonluminous area that divides the negative glow from the positive column in a Crookes tube under conditions of moderate...
endoscope
An endoscope is a medical device used for visualizing and examining the interior of hollow organs, body cavities, or...
cathode-ray output
A term used in data processing to describe a cathode-ray tube that displays graphic or character data.
beam deflection tube
An electron-beam tube in which the current to an output electrode is regulated by the transverse motion of the tube's...
flashback voltage
The inverse peak voltage that produces ionization in a gas tube.
direct viewing
The observation of a reproduced television picture on the face of a cathode-ray tube.
ultrasonic camera
A device that uses a piezoelectric crystal to convert ultrasonic sound waves, transmitted through a subject, into a voltage...
astronomical telescope
An astronomical telescope is a type of optical instrument designed to gather and magnify light from distant celestial...
image dissector tube
An electron tube that is used as a camera tube for a television system. When the picture to be transmitted is focused on a...
focusing anode
One of the electrodes used to focus the electron beam of a cathode-ray tube. As the electrode's voltage is changed, its...
ultraviolet molecular nitrogen laser
A pulsed laser having molecular nitrogen as laser material and a wavelength output of 337 nm in the ultraviolet region. It...
radar display
The spontaneous visual presentation of radar information by electronic traces on a cathode-ray tube.
laser velocimeter signal detection
The variation of the electronically detected signal with respect to the scaled version of the classical optical signal...
cascade image tube
An image tube that functions in low-light-level conditions by virtue of its series of stacked sections wherein the output of...
jitter
1. In relation to cathode-ray tube displays, errors in the signal's amplitude, phase or both that result in small, rapid...
microscope objective
The lens located at the object end of a microscope tube. A wide range of objectives is available, including simple...
electro-optic detector
A device that detects radiation by utilizing the influence of light in forming an electrical signal. It may be a phototube;...
quantum efficiency
Quantum efficiency (QE) is a measure of the effectiveness with which a device or system, typically in the context of...
matrix
With respect to television, that part of a color television circuit that combines the I, Q and Y signals, and changes them...
shadow mask tube
A type of color-generating cathode-ray tube that uses a shadow mask, a thin perforated electrode, located close to the...
chuck
In the optical field, a tube to which a lens is fastened for centering.
transversely excited atmosphere carbon dioxide laser
Abbreviated TEA CO2 laser. A gas laser that provides shorter pulses and higher peak powers than conventional CO2 lasers. The...
infrared image tube
An image converter that produces a visible image based on the infrared emittance of the object. The infrared energy is...
kinescope
A cathode-ray tube that serves as a picture tube in a television receiver. The signal representing the picture intensity is...
spectrum analyzer
A scanning device used to cyclically tune through a given frequency range to determine the amplitude-frequency distribution...
deflection focusing
The progressive defocusing of a cathode-ray tube display image that occurs when the deflected electron beam impinges on the...
traveling wave phototube
A traveling wave tube (TWT) containing a photocathode and window that, receiving a laser beam, produces a modified...
thyratron
An arc discharge tube having a grid that is used to start the discharge through an atmosphere of inert gas or vapor at low...
photoglow tube
A particular type of phototube having increased sensitivity as a result of the glow initiated by light incident to the...
visually coupled airborne systems simulator
A visual system including a tiny television tube and imaging optics, all contained in a helmet to be worn by pilots in...
shutter speed tester
A device used to measure the opening time of a shutter. The most common devices depend on the charging or discharging of an...
photocathode
An electrode used to release photoelectric emission when irradiated, making it then the irradiated negative electrode of a...
graphecon
An electron tube having two electron guns, one on each side of the storage medium, to encode the information onto the...
brightness control
The manual shifting bias control of a cathode-ray tube that determines both the average brightness and the contrast of a...
character generation cathode-ray tube
A cathode-ray tube that generates symbols for use in other displays. The tube operates by scanning specific characters on...
extinction voltage
The lowest anode voltage at which a gas tube can sustain a discharge.
x-ray tube target
Also known as an anticathode. An electrode or electrode section that is focused upon by an electron beam and that emits...
waveguide laser
Gas laser in which the tube acts as a channel for the laser beam.
blooming
The loss of focus of a camera sensor because of excessive brightness, characterized by the enlargement of spot size and...
photoelectric scanner
A system mounted a few inches above a moving plane that consists of a light source, lenses and one or more phototubes. In...
blanking
The process by which the raster beam in a video tube is cut off during the retracing and sync periods.
ablative wall flashlamp
A high-brightness, short-duration source in which low-pressure gas initiates the discharge to vaporize material from the...
cathode-ray tube lens
A high-quality, narrow-angle lens of high aperture designed for low magnification in the recording of cathode-ray tube...
dark space
The portion of a glow discharge tube that permits little or no light transmission.
convergence
1. In optics, the bending of light rays toward each other, as by a convex or positive lens. 2. Turning in the eyes to view a...
image converter high-speed camera
A camera that uses an image converter tube in such a way that voltage waveforms applied to internal electrodes cause the...
mechanical tube length
In a microscope, the physical distance between the focal points of the objective lens and the eyepiece. The standard tube...
waveguide
A waveguide is a physical structure or device that is designed to confine and guide electromagnetic waves, such as radio...
trapezium distortion
The distortion of an image formed by a cathode-ray tube, caused by unbalanced deflection voltages or deflection voltages...
x-ray vacuum
The pressure in the gas region of an x-ray tube that has been reduced below 0.1 mm, the pressure necessary for the tube.
image converter
An electron tube that employs electromagnetic radiation to produce a visual replica of an image produced on its cathode....
electron-gun system
An electron-gun system is an assembly used to generate and control a focused beam of electrons. Electron guns find...
photoemissive tube photometer
A photometer that uses a photoemissive tube to detect and measure light. See photoelectric photometry.
microscope
An instrument consisting essentially of a tube 160 mm long, with an objective lens at the distant end and an eyepiece at the...
target
1. The anode or anticathode of an x-ray tube that emits x-rays when bombarded by electrons. 2. The screen in a television...
triad
In a color cathode-ray tube, a grouping of three color dots (red, blue and green) that represent one pixel in the final...
vidicon
A small television tube originally developed for closed-circuit television. It is about 1 inch in diameter and 5 inches...
head-up display
An optical system that superimposes a synthetic display providing navigational or weapon-aiming information on a pilot's or...
flyback
The time it takes a cathode-ray tube's electron beam to return to its starting point after completing one line, one field or...
chalnicon
Proprietary name for a low-light-level TV pickup tube.
flash sensitometer
A sensitometer that utilizes an electronic flashtube or a photoflash lamp as both the light source and the shutter for...
iconoscope
A camera tube that employs a high-velocity electron beam to scan a photoemissive mosaic and to store electrical charge...
scanning disc
In field-sequential color television, the rotating tricolor disc placed between the subject and the lens, or between the...
flooding compound
A material that surrounds a fiber optic cable's buffer tubes to prevent moisture from entering if the jacket is breached.
diode
A two-electrode device with an anode and a cathode that passes current in only one direction. It may be designed as an...
x-plates
Two flat parallel electrodes that are vertically mounted alongside each other in a cathode-ray tube and produce horizontal...
scanner
1. A device used to trace out an object and build up an image. One of the most common of these types is video scanning. The...
klystron
A thermionic tube that has a velocity-modulated electron stream and that may be used as a microwave amplifier or oscillator.
infrared instrument
Any of the photoelectric and thermal detectors, spectrographs and monochromators, thermographs, scanners, amplifier tubes,...
saticon
A direct-readout television pickup tube.
periscope
An optical instrument designed to displace the line of sight in a vertical direction. For submarines and other military uses...
borescope
A device for the internal inspection of hard-to-get-at mechanical parts, such as rifle barrels, sewer pipes, oil wells, or...
Geissler tube
A specific gas-filled tube designed to illustrate the luminous effects of discharges through rarefied gases.
crystal diode
A diode with a semiconducting material, such as germanium or silicon, for one electrode, and a fine wire "whisker''...
gated image tube
An intensified charge-coupled device that uses a large negative charge at the grid to switch off the flow of electrons at...
cesium phototube
A phototube having a cesium-coated cathode that has its greatest sensitivity in the infrared region.
scanning head
A device composed of a light source and phototube used to scan a moving strip of material in photoelectric side-register...
Lenard tube
An electron-beam tube designed so that the beam can be carried through a portion of the wall of an evacuated enclosure.
arc light source
In present usage, especially for spectroscopic identification, an arc between electrodes that serves as a radiation source....
storage tube
A cathode-ray tube combined with an electrostatic storage unit that is used to introduce, store and retrieve information...
trace
In a cathode-ray tube, the visible line or lines formed on the screen by the deflection of the electron stream.
beryllium oxide
A dielectric ceramic material used in laser capillary tubes because of its high electrical resistivity and high thermal...
skiatron
A system employing a dark trace tube in which the opacity of the screen is varied as a function of the power of the beam.
Newtonian telescope
A telescope with a concave paraboloidal objective mirror and a small plane (diagonal) mirror that reflects rays from the...
McLeod gauge
A gauge designed to measure high degrees of vacuum. It consists of a glass bulb attached to the vacuum vessel, the...
scanning spot
The spot illuminated on a cathode-ray tube by the initial impact of the scanning ray and the screen.
intensified vidicon
A standard direct-readout vidicon tube linked by fiber optics to an intensifier for increased sensitivity.
monoscope cathode-ray tube
A character generation CRT that functions on the principle of secondary emission. The target holds a set of aluminum...
neon tube
An electron tube containing neon gas that uses the transmission of an electric current through the gas to ionize the neon...
picture tube
A term referring to the cathode-ray tube used in television receivers.

(276 results found)

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