Light tube - Factbites

Light tube - Factbites
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Topic: Light tube

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In the News (Thu 24 Dec 09)

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	Poultry Housing Tips, vol. 10 no. 11
		The new lighting system was tested with both nine-watt green light tubes and conventional nine-watt white light tubes.
		The reason for the interest is that the new compact fluorescent light bulbs are said to be dimmable, produce more light, use less electricity, and emit a green light which is claimed to improve bird performance.
		There is a new compact fluorescent lighting system on the market for broiler houses which has generated a significant amount of interest among both poultry companies and producers.
	www.engr.uga.edu /service/extension/ventilation/v10n11.html (575 words)

	3-D imaging multiple target laser radar - US Patent 6414746
		The device for imaging one or more three dimensional objects immersed in a light conduction medium of claim 37 wherein the said time sequence of reflected laser amplitude signals including the peak of the reflected light signal are stored by charging a plurality of capacitors that are sequenced in time.
		The device for imaging one or more three dimensional objects immersed in a light conduction medium of claim 22 wherein said electron amplifier is a diode array electrically connected to the readout array and impact ionization in the diode array is the amplification means.
		The device for imaging one or more three dimensional objects immersed in a light conduction medium of claim 1 wherein the said data related to the first return transit time is obtained by means of disconnection from a series of clock pulses.
	www.patentstorm.us /patents/6414746.html (575 words)

	GE Consumer & Industrial Lighting: Ask Us: FAQs - Ballasts and Fluorescent Tubes
		Fluorescent light bulbs (including compact fluorescents) are more energy-efficient than regular bulbs because of the different method they use to produce light.
		A ballast is an electrical component used with a fluorescent bulb (or mercury vapor lamp or arc lamp) to conduct electricity at each end of the tube.
		In a fluorescent bulb, when the gas is excited by electricity, it emits invisible ultraviolet light that hits the white coating inside the fluorescent bulb.
	www.gelighting.com /na/home_lighting/ask_us/faq_ballasts.htm (1180 words)

	Light Bulbs, Energy Saving light bulbs, Halogen Light Bulbs, Compact Fluorescent Light Bulbs
		Compact Fluorescent Light Bulbs :: 2 pin Compact Fluorescent :: CF13DS-827 13W 827K Single Twin Tube 2pin Compact Fluorescent.
		CF7DS-850 7W (Equivalency: 35W) Single Twin Tube Compact Fluorescent T4 Lamp With 2-Pin G23 Base, Average Life 10000 Hrs, 5000K Color Temperature, 82 CRI, 400 Lumens (Maximum Overall Length 5.3 Inch)
		CF5DS-841 5W (Equivalency: 25W) Single Twin Tube Compact Fluorescent T4 Lamp With 2-Pin G23 Base, Average Life 10000 Hrs 4100K Color Temperature, 82 CRI, 230 Lumens (Maximum Overall Length 4.2 Inch)
	www.abcbulbs.com /item.asp (1180 words)

	How Things Work - Fluorescent Lamps
		Some ultraviolet fluorescent tubes are simply the mercury discharge tubes (as in a normal fluorescent tube) but without any phosphor coating on the inside of the tube and with a quartz glass tube that transmits 254 nanometer light.
		When this fluorescent powder is exposed to ultraviolet light, it absorbs the light energy and reemits some of it as visible light, a process called "fluorescence." The missing light energy is converted to thermal energy, making the tube slightly hot.
		The spectrum of light from a fluorescent lamp is not simple or featureless--many wavelengths are essentially missing and the intensities of the remaining wavelengths don't vary smoothly with wavelength.
	howthingswork.virginia.edu /fluorescent_lamps.html (14177 words)

	Video History Project: Resources - Tool Description
		The vidicon tube of a camera must be light sensitive in order to overate; however the camera must always be protected from exposure to excessively bright light.
		The camera collects light reflected from objects and focused by the lens on the vidicon tube surface inside the camera and converts this light energy into electrical energy.
		Although the image on the vidicon tube exists as a whole, through the scanning process of the camera the image is broken down into 525 horizontal lines; the scanning beam of the camera reads across each horizontal line from left to right producing a continuously varying electrical signal.
	www.experimentaltvcenter.org /history/tools/ttool.php3?id=36&page=1 (2242 words)

	Howstuffworks "How is the LCD in a laptop computer so bright?"
		The light we see from a fluorescent tube is the light given off by the phosphor coating the inside of the tube.
		A fluorescent light is most often a long straight glass tube that produces white light.
		The inside of a fluorescent light is coated with phosphor.
	computer.howstuffworks.com /question580.htm (400 words)

	Howstuffworks "What is the difference between a fluorescent light and a neon light?"
		The light we see from a fluorescent tube is the light given off by the phosphor that coats the inside of the tube (the phosphor fluoresces when energized, hence the name).
		A fluorescent light, on the other hand, is most often a long, straight tube that produces white light.
		The light of a neon tube is the colored light that the neon atoms give off directly.
	www.howstuffworks.com /question293.htm (336 words)

	Photomultiplier Tubes on GlobalSpec
		Photomultiplier tubes are used in applications where rapid detection of light or low light detection is necessary.
		Photomultiplier tubes consist of an evacuated envelope with a photocathode that emits electrons when exposed to light.
		Some types of photomultipliers are designed to filter out some of the noise, which would negatively impact upon their ability to detect light.
	plantservices.globalspec.com /LearnMore/Optics_Optical_Components/Optoelectronics/Photomultiplier_Tubes (336 words)

	Light Gas Gun
		Before the firing button is pressed, the gun is configured as in the top drawing: gunpowder is loaded in the breech, the piston in the pump tube is directly in front of the gunpowder, and the hydrogen gas is trapped between the piston and the rupture diaphragm, which is located inside the high-pressure coupling.
		When the gun is fired, the sequence of events goes like this (Anything other than this sequence would constitute an unwelcome situation of one degree or another, all of which are basically evil.): The gunpowder is ignited and pushes the piston down the pump tube at high velocity.
		This highly stylized diagram of the light-gas gun shows the basic principles behind its operation.
	ares.jsc.nasa.gov /Education/websites/craters/lgg.htm (1680 words)

	Layman's Desciption of the Ram Accelerator
		The projectile is injected into the tube at supersonic velocities by a conventional light gas gun.
		Unlike light gas guns, mass drivers, and railguns, the ram accelerator stores its energy source (combustible gas) in the launch tube itself.
		There are tricks you can play, such as heating the propellant gas so it can expand faster, or using low molecular weight gas, so that more of the energy goes into accelerating the projectile rather than the gas (hence the term "light gas guns").
	www.aa.washington.edu /AERP/ramac/layman.html (1680 words)

	NASA WSTF Hypervelocity Impact Test Facility
		Typical two-stage light gas guns consist of a powder breech, pump tube, high-pressure coupling, barrel or launch tube, expansion chamber, and target chamber.
		The second stage of the light gas gun consists of the barrel, the flight range, and the target chamber, and is separated from the first stage by a scored rupture disc.
		The first stage of a light gas gun consists of a breech, a larger diameter cylinder filled with compressed hydrogen gas and a high-pressure coupling or accelerated reservoir.
	www.wstf.nasa.gov /Hazard/Hyper/Facility.htm (1680 words)

	"Fluorescent lighting a radiant choice!" by treeoflife, grip, and burn1 - Marijuana Growing
		What makes the difference in the quality of the light is the white stuff (can't remember the name for it) that coats the inside of the glass tube, as it is what "produces" the light same as the phosphor in a tv tube.
		There's one tube which has an outstanding quality of light, and the reason the quality is so good is that they use 6 different substances or ingredients in their "white stuff" where normally only 2 to 3 are used.
		Most tubes produced _very_ uneven light (which cannot be detected by human eye though), meaning the quality of light in those tubes is actually not that good.
	www.overgrow.com /edge/showthread/t-199113-p-1.html (1680 words)

	Gas Discharge Lamps, Ballasts, and Fixtures
		The arc tube's discolorations absorb light from the arc, causing the arc tube to overheat, the sodium vapor pressure becomes excessive, and the arc cannot be maintained.
		Because of the unusual appearance of the light from gas discharge tubes, quacks and con artists also have used and are using this technology as part of expensive useless devices for everything from curing cancer to contacting the dead.
		Fluorescent lamps are a special class of gas discharge lamps where the electric current produces mostly invisible UV light which is turned into visible light by a special phosphor coating on the interior of the tube.
	repairfaq.ece.drexel.edu /sam/dlamp.htm (1680 words)

	ChemTeam: Cathode Ray Tube History
		1876 Eugen Goldstein shows that the radiation in a vacuum tube produced when an electric current is forced through the tube starts at the cathode; Goldstein introduces the term cathode ray to describe the light emitted.
		As concerning the nature of the cathode ray, the Germans tended to the explanation that cathode rays were a wave (like light), whereas the British tended to believe that the cathode ray was a particle.
		Philipp von Lenard develops a cathode-ray tube with a thin aluminum window that permits the rays to escape, allowing the rays to be studied in the open air.
	dbhs.wvusd.k12.ca.us /webdocs/AtomicStructure/Disc-of-Electron-History.html (799 words)

	Jinhui Compact Fluorescent Bulb -- Manufacturer of Compact Fluorescent Light Bulb from China
		Selecting the light colour for many areas of application, the choice of the correct light is not based on clearly defined standards, as is the case with illuminance or colour rendering properties for example.
		One of the most important aspects of saving energy lighting design is to determine the number of luminaires required, based on a given illuminance value......
		Compact bulbs generate more than 80% of all the artificial light but consume only 50% of the energy needed for lighting.
	www.jinhui-lighting.com (799 words)

	Dr. James Simon - Endotracheal Tube
		The present invention is an endotracheal intubation device containing a light source and having simultaneous suctioning ability, enabling a practitioner to apply suction to a patient's airway while at the same time visualizing the airway for insertion of the endotracheal tube.
		The endotracheal intubation device includes a light source disposed to shine proximal to the distal end of an endotracheal tube and means for connection to a suction source.
		The light source for the lighted sleeve may be either fiberoptic or chemiluminescent in nature.
	www.illumitube.com /patent.htm (1676 words)

	General Spectroscopy Overview
		Other photodetectors include imaging tubes (e.g., television cameras), which can measure a spatial variation of the light across the surface of the photocathode, and microchannel plates, which combine the spatial resolution of an imaging tube with the light sensitivity of a photomultiplier.
		The first sources of spectral emission lines were simply arc lamps, or another form of electrical discharge in a sealed tube containing gas in which the pressure was kept so low that a significant portion of the radiation was emitted in the form of discrete lines.
		The Geissler discharge tube, of which the neon lamp used in advertising signs provides an example, is such a source.
	www.pharm.uky.edu /ASRG/general_spectroscopy.html (1676 words)

	Olympus Microscopy Resource Center: Photomicrography - Interactive Flash Tutorials - Photomultiplier Tubes
		A photomultiplier tube, useful for light detection of very weak signals, is a photoemissive device in which the absorption of a photon results in the emission of an electron.
		Photomultipliers acquire light through a glass or quartz window that covers a photosensitive surface, called a photocathode, which then releases electrons that are multiplied by electrodes known as metal channel dynodes.
		Photomultipliers produce a signal even in the absence of light due to dark current arising from thermal emissions of electrons from the photocathode, leakage current between dynodes, as well as stray high-energy radiation.
	www.olympusmicro.com /primer/flash/photomultiplier (1676 words)

	Howstuffworks "Are fluorescent bulbs really more efficient than normal light bulbs?"
		There are electrodes at both ends of a fluorescent tube, and a gas containing argon and mercury vapor is inside the tube.
		The problem with incandescent light bulbs is that the heat wastes a lot of electricity.
		Heat is not light, and the purpose of the light bulb is light, so all of the energy spent creating heat is a waste.
	home.howstuffworks.com /question236.htm (432 words)

	Adelaide Aquariums catalogue: aquarium lighting, fluorescent tubes and more
		Fluorescent light tubes for aquaria differ from normal household fluorescent tubes in their spectrum and intensity.
		Units to hold 2 tubes are available in some sizes, however, due to their cost, we recommend you consider aqua-one mirrored units, glo-mat units or compact flourescents for applications requiring greater light intensity.
		Although normal household tubes will fit in most aquarium light units, their use is not recommended as they give an unpleasant murky appearance and promote the growth of algae.
	www.adelaideaquariums.com.au /products/lighting.html (1856 words)

	New Page 3
		Francis Hauksbee devised experiments that eliminated the barometric tube, and indeed the vacuum, and produced a spectacular display of light.
		He saw the light objects moving towards the electrics and therefore he assumed that the attractive force was due to the electrics and that the electrics acted on the attracted objects, but that the attracted objects did not attract the electrics.
		He intuitively guessed, that the light display is due to the friction between the glass and the little drops of mercury.
	xnet.rrc.mb.ca /janaj/history.htm (1856 words)

	io.html
		Vidicon tube: an electron gun + target and faceplate housed in a cylindrical glass envelope.
		As the electron beam scans the target, the electrons are replaced in light area and current flows in the external target circuit.
		Vidicon output Ir where I = light intensity and r 0.6.
	icsl.ee.washington.edu /~vikram/io.html (1607 words)

	Photomultiplier Tube Socket Assemblies - Products for Research Inc.
		All photomultiplier tube socket assemblies are fully tested at Products for Research to insure mechanical and electrical integrity as well as very low electrical leakage (in the order of 1 PA) and full RFI shielding where applicable.
		All photomultiplier tube socket assemblies for side looking tubes and tubes with rectangular apertures are constructed so that a rotational adjustment of ± 5° can be made while the tube is operating.
		These interchangeable tube socket assemblies are not only interchangeable with sockets used in housings of the same type but are also interchangeable with sockets provided with any other housing for the same nominal diameter PMT.
	www.photocool.com /sockets.htm (1607 words)

	Queen's Sudbury Neutrino Observatory Group: Analysis
		SNO detects neutrinos because neutrino interactions in water produce small flashes of light which are detected by the array of photomultiplier tubes around SNO's volume of heavy water.
		Each yellow circle is a photomultiplier tube which detected light.
		This is a photo taken with a fish-eye lens from the very bottom of the SNO detector just before the last photomultiplier tubes were installed.
	sno.phy.queensu.ca /sno/queens/analysis.html (1607 words)

	Booster Neutrino Experiment - Photomultiplier Tubes
		Photomultiplier tubes (PMTs) turn light signals into electrical signals by means of the photoelectric effect, a quantum mechanical phenomenon in which a particle of light (a photon) hits a metal surface (the photocathode) and causes an electron to be ejected from the surface.
		Each of the 1500 tubes in MiniBooNE's tank underwent a detailed testing procedure, designed to find the tube's optimal operating voltage and other response characteristics.
		Knocking out an electron from the photocathode is just the first step in the light-to-electrical signal process.
	www-boone.fnal.gov /public/introduction/11.html (1607 words)

	Super-Kamiokande
		On November 12, 2001, several thousand photomultiplier tubes in the Super-Kamiokande detector imploded, apparently in a chain reaction as the pressure waves from each imploding tube cracked its neighbours.
		An image inside the detector where technicians maintain the photomultiplier tubes in a boat on top of the pure water.
		The detector has been partially restored with about 5000 photomultiplier tubes with protective shells that will prevent the chain reaction from recurring.
	www.portaljuice.com /super_kamiokande.html (1607 words)

	Learn more about Neutrino in the online encyclopedia.
		Pure water detectors such as Super-Kamiokande contain a large area of pure water surrounded by sensitive light detectors known as photomultiplier tubes.
		This generates an "optical shockwave" known as Cherenkov radiation which can be detected by the photomultiplier tubes.
		The results of these reactions can be detected by photomultiplier tubes.
	www.onlineencyclopedia.org /n/ne/neutrino.html (1607 words)

	Video camera image tube burn-in prevention apparatus - Patent 4492982
		A video camera according to the claim 3, further comprising light detecting means, different from said detecting means of said image tube, for detecting luminance of an object, and said automatic aperture control means for controlling said aperture of said diaphragm in accordance with an output of said light detecting means.
		Still another object of the present invention is to provide a video camera comprising an imaging tube, detecting means for detecting the function state of said imaging tube, and control means for controlling the amount of light entering said imaging tube from the object in response to the output signal of said detecting means.
		A video camera according to the claim 8, wherein said memory member holds the detecting output from said detecting means until the application of power by said power supply means to the heater of said imaging tube is shut off.
	www.freepatentsonline.com /4492982.html (8422 words)

	OPIA, news
		A light-in light-out vacuum tube device capable of amplifying low light images.
		The tube consists of a photocathode on the input and a phosphor on the output and sometimes a microchannel plate for increased gain characteristics.
		In a video camera or monitor, the aperture refers to the size and shape of the electron beam that lands on the target or phosphor.
	www.opia.org /glossary.html (9997 words)

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In the News (Thu 24 Dec 09)