
	Where results make sense

Topic: Photoelectric cell

Related Topics

Solar cell

Photovoltaic cell

Conjugated system

LED

Getter

Cesium

Fullerene

List of political parties in Aruba

Beyer

Medieval medicine

Van der Waals radius

3 Musketeers

Battle of Dieppe

Universal Networking Language

Estate

In the News (Sat 5 Dec 09)

Northern Trust

Marvin Harrison

Peter Chernin

Gary Locke

Match Play

Penelope Cruz

Mickey Rourke

AR Rahman

Danny Boyle

Hugh Jackman

	Solar cell - Wikipedia, the free encyclopedia
		A solar cell (or a "photovoltaic" cell) is a semiconductor device that converts photons from the sun (solar light) into electricity.
		Solar cells are often electrically connected and encapsulated as a module, termed a photovoltaic array or solar panel.
		Organic solar cells and Polymer solar cells are built from thin films (typically 100 nm) of organic semiconductors such as polymers and small-molecule compounds like polyphenylene vinylene, copper phthalocyanine (a blue or green organic pigment) and carbon fullerenes.
	en.wikipedia.org /wiki/Photoelectric_cell (5392 words)

	[No title]
		The photoelectric block works when enough darkening happens to the photoelectric cell, and that happens when the tape becomes dark as a result of changing the light filter when calibrating the device.
		The springs of the separators (shields) (2,16) are fixed so that the light beam falling on the photoelectric cell is always less than the light beam reflected from the moistened tape and falling on the active photoelectric cell (in the absence of the poisonous material spots on the tape).
		At the lower part of the photoelectric cell block, between the tight transparent glass (10) and the light filter (4) sits the upper parts of the reaction chamber, the analyzed air enters the upper parts of the reaction chamber through nipple (6).
	www.gulflink.osd.mil /declassdocs/dia/19961031/961031_ln179-95_1.html (6031 words)

	Photoelectric Cells
		A photoelectric cell is a device that is activated by electromagnetic energy in the form of light waves.
		Photoelectric cells exists in three basic kinds, corresponding to the three different forms of the photoelectric effect that they employ: the photoconductive cell, the photoemissive cell, and the photovoltaic cell.
		A photoemissive cell is constructed with a wire anode and a semi-cylindrical cathode with an emitting surface, sealed in an evacuated or gas-filled bulb.
	members.tripod.com /~Eagle_Planet/photoelectric.html (794 words)

	Laser beam welding cane, particularly for the sealing of tubes - Patent 5252804
		The latter attenuates the illumination of the photoelectric cell 45 and adapts it to the sensitivity of the cell.
		The photoelectric cell 45 supplies an electrical signal which varies as a function of the inclination of the rays which illuminate it, the flux being a maximum for rays parallel to the axis of the cell and a minimum for rays perpendicular to this axis.
		The inclined position of the cell 45 in the hole 43 of the positioning sleeve is intermediate between a first position, parallel to the axis of the light pipe 47, of maximum illumination of the cell 45 and a second position, perpendicular to the position, of minimum illumination of the cell 45.
	www.freepatentsonline.com /5252804.html (1599 words)

	Apparatus for measuring illuminance - Patent 4260256
		If the wedge and cell are on the same side of the lens, the gradation of transparency of the wedge is opposite in sense to the gradation of sensitivity of the cell but the gradation of density or opacity of the wedge has the same sense as the gradation of sensitivity of the cell.
		Photoelectric cell 10 as used herein is intended to include types of cells whose electrical properties are modified by the action of light.
		This may be desirable, for example, in situations where one wishes the photoelectric cell's response curve to vary with the intensity of radiation coming from a scene in order to compensate for the variance in the exposure-response curve of a specific photographic film.
	www.freepatentsonline.com /4260256.html (2860 words)

	Photoelectric Cell - MSN Encarta
		In its simplest form the phototube is composed of a cathode, coated with a photosensitive material, and an anode.
		The photoelectric cell, popularly known as the electric eye, is employed in operating burglar alarms, traffic-light controls, and door openers.
		A phototube and a beam of light (which may be infrared or invisible to the eye) form an essential part of such an electric circuit.
	encarta.msn.com /encnet/refpages/RefArticle.aspx?refid=761569780&pn=1 (306 words)

	AllRefer.com - photoelectric cell (Electrical Engineering) - Encyclopedia
		photoelectric cell or photocell, device whose electrical characteristics (e.g., current, voltage, or resistance) vary when light is incident upon it.
		In the phototube, an older type of photocell, two electrodes are enclosed in a glass tube : an anode and a light-sensitive cathode, i.e., a metal that emits electrons in accordance with the photoelectric effect.
		A phototransistor, which is a type of photovoltaic cell, can generate a small current that acts like the input current in a conventional transistor and controls a larger current in the output circuit.
	reference.allrefer.com /encyclopedia/P/photelcel.html (492 words)

	AMS Glossary
		—A photoelectric cell with electrical resistance that varies with the amount of illumination falling upon the sensitive area of the cell.
		Photoelectric effect is often synonymous with surface photoelectric effect, “the release of electrons by light at the boundary between a solid or liquid.
		—A device that uses a photoelectric cell to measure electromagnetic radiation in the visible portion of the electromagnetic spectrum.
	amsglossary.allenpress.com /glossary/browse?s=p&p=23 (404 words)

	Encyclopedia (Site not responding. Last check: 2007-10-31)
		The term photoelectric effect designates four types of interactions: the external photoelectric effect, or photoemission; photoionization; photoconduction; and the photovoltaic effect.
		In the external photoelectric effect, electrons are liberated from the surface of a metallic conductor under the influence of light.
		PHOTOELECTRIC CELL, (q.v.), where the electrons liberated from one pole of the cell, the photocathode, migrate to the other pole, the anode, under the influence of an electric field.
	www.historychannel.com /encyclopedia/article.jsp?link=FWNE.fw..ph072100.a (538 words)

	Cell (computer) - Search Results - MSN Encarta
		Cell (computer), in computer spreadsheet terminology, the intersection of a row and a column.
		Active Cell, in computer science, also called the current or selected cell.
		Photoelectric Cell, also phototube, electron tube in which the electrons initiating an electric current originate by photoelectric emission.
	encarta.msn.com /Cell_(computer).html (144 words)

	AllRefer.com - photoelectric effect (Physics) - Encyclopedia
		photoelectric effect, emission of electrons by substances, especially metals, when light falls on their surfaces.
		Moreover, classical theory predicted that the photoelectric current should not depend on the frequency of the light and that there should be a time lag between the reception of light on the surface and the emission of the electrons.
		The effect has a number of practical applications, most based on the photoelectric cell.
	reference.allrefer.com /encyclopedia/P/photelef.html (383 words)

	National Park Service: Astronomy and Astrophysics (University of Illinois Observatory)
		The University of Illinois Observatory is significant because of its association with the development of the selenium photoelectric cell which revolutionized the science of astronomical photoelectric photometry--the measurement of celestial magnitudes.
		The development of the selenium cell was done by Joel Stebbins (1878-1966), in the years from 1907 to 1922, while he was the director of the University of Illinois Observatory.
		This cell was the predecessor of the modern-day "electric eye." Its applications in science and industry have been widespread, including early uses in talking motion pictures, television, and aviation.
	www.cr.nps.gov /history/online_books/butowsky5/astro4h.htm (2049 words)

	Motion Sensors Home Security Systems Photoelectric Motion Sensing Alarms
		Photoelectric detection systems use a light-sensitive cell and a directed light source which points directly at the cell.
		Photoelectric security systems can be classified as motion detection systems since an object or person must move across the photoelectric connection to break the light transmission to the sensor.
		Photoelectric may seem an old technology, however it is still in use in many home security systems.
	www.homesecurityandalarms.com /photoelectric-sensors.aspx (233 words)

	WESTMINSTER INTERNATIONAL - smoke detection / detectors
		Photoelectric Smoke Detectors detect the presence of smoke by means of a small light source and a separate photoelectric light sensitive cell housed within a sensing chamber.
		In normal circumstances light from the light source travels along the chamber in a straight line and does not enter the section where the photoelectric cell is. When smoke enters the chamber however the smoke particles scatter the light causing some to travel towards the photoelectric cell.
		Photoelectric Smoke Detectors are generally more sensitive to larger smoke particles such as that generated by dense smoke or smoldering fires but are less sensitive to small particles of smoke found in rapidly burning fires.
	www.wg-plc.com /international/fire/smoke.html (493 words)

	PIRA 7A10.00 PHOTOELECTRIC EFFECT (Site not responding. Last check: 2007-10-31)
		A photoelectric effect apparatus based on the AD 515 electrometer op amp allows relatively inexpensive and easy direct measurement of the photopotential between anode and photocathode.
		The photoelectric threshold demonstrator consists of a projected spectrum, a sample holder, and a translucent screen.
		Shine a light on a photoelectric cell to ring a bell.
	www.physics.ncsu.edu /pira/7modern/7A10.html (525 words)

	HOBODepot Labs (Site not responding. Last check: 2007-10-31)
		A photoelectric cell detects the presence or absence of light.
		The purpose of this lab is to build a simple photoelectric cell and to test the effect on the cell of varying the intensity of the light shining on it.
		This is called the photoelectric effect and occurs when the light photon striking the metal possesses enough energy to excite the electron so that it jumps out of its orbit.
	www.iscienceproject.com /labs/finished_labs/6366_photoelectriccell.html (1014 words)

	Kaixo, classifier of photoelectric cells
		These panels are made up of photoelectric cells (the 80-100 little square units in any one panel).
		Photoelectric cells are classified according to the power they produce, given that total power production of any panel can be limited by just one photoelectric cell of lower power production.
		This photoelectric cell classifier was named Kaixo (“Hello” in the Basque language).
	www.innovations-report.com /html/reports/energy_engineering/report-15833.html (516 words)

	selenium cell - Search Results - MSN Encarta
		- photoelectric cell: a photoelectric cell based on the light-sensitive properties of selenium and containing a strip of selenium mounted between two metal electrodes
		Selenium is in group 16 (or VIa) of the periodic...
		Cells are the smallest structures capable of basic life processes, such as taking in nutrients, expelling waste,...
	ca.encarta.msn.com /selenium_cell.html (115 words)

	photoelectric on GlobalSpec (Site not responding. Last check: 2007-10-31)
		Photoelectric Sensors (218 companies) Photoelectric sensors use emitters and receivers to detect the presence, absence, or distance of target objects.
		Photoelectric Safety Sensors (33 companies) Photoelectric safety sensors detect objects by using the properties of light sensitive elements.
		Light Curtains (110 companies) Light curtains are photoelectric transmitters that project an array of synchronized,parallel infrared light beams to a receiver unit.
	proximity-sensors.globalspec.com /Industrial-Directory/photoelectric (965 words)

	Photoelectric Cell - Search Results - MSN Encarta (Site not responding. Last check: 2007-10-31)
		Photoelectric Cell - Search Results - MSN Encarta
		Photoelectric Cell, also phototube, electron tube in which the electrons initiating an electric current originate by photoelectric emission (...
		One problem facing developers was the need for a transducer (energy converter) that could turn light into electricity.
	uk.encarta.msn.com /Photoelectric_Cell.html (144 words)

	[No title]
		b & c 3) For light of certain frequency _______ the threshold frequency, the photoelectric current is _______ proportional to the intensity of light 1.
		Einstein by quantum nature of radiation 17) in photoelectric experiment by applying a stopping potential, the photo electric current becomes 1.
		both are true 19) the photoelectric effect supports the quantum nature of light, because 1.
	www.it.iitb.ac.in /~vallies/Physics7.doc (636 words)

	Cell Electric - Search Results - MSN Encarta (Site not responding. Last check: 2007-10-31)
		Cell, Electric, device that stores energy in the form of chemicals, the energy being released when a conductor is connected between the terminals of...
		It consists of two or more electric cells connected...
		Electronics, field of engineering and applied physics dealing with the design and application of devices, usually electronic circuits, the operation...
	uk.encarta.msn.com /Cell_Electric.html (117 words)

	[No title]
		] Use of a photoelectric control system as a longitudinal position regulator to maintain the position of the point of cutoff with respect to a repetitive pattern of moving material.
		] Device using a photoelectric cell to measure fluorescence in a chemical sample that has been excited (one or more electrons have been raised to higher energy level) by ultraviolet or visible light; used for analysis of chemical mixtures.
		] The magnitude of a celestial object, as measured by a photoelectric photometer attached to a telescope.
	www.accessscience.com /Dictionary/P/P20/DictP20.html (2133 words)

	The Particle Nature of Light
		After studying this section, you will (a) understand the basis for the photoelectric effect, (b) understand the reasons for the failure of the wave model for light and (c) understand Einstein's particle model for light, as well as Planck's Law.
		Using this apparatus, it is found that the maximum energy of the emitted photoelectrons increases as the frequency of the incident light increases.
		The wave model for light fails to account for the photoelectric effect because the energy transmitted by a wave is proportional to the amplitude.
	www.physchem.co.za /Light/Particles.htm (1111 words)

	Photoelectric Effect (Site not responding. Last check: 2007-10-31)
		In the late 1800s the photoelectric effect was puzzling to scientists and could not be explained until Einstein published his theory of the photoelectric effect in 1905.
		In a photovoltaic cell, special semiconductor materials are used that automatically attract electrons.
		Their attraction forces them out of the cell, since they cannot go back across the junction, and through an electric circuit to create the electric current.
	www.powerfrontiers.com /photoelectric_effect.htm (506 words)

	Teralab - Glass Blowing - Magnesium Photoelectric Cell
		A photoelectric cell consists of a very clean surface of a low work function material in a vacuum.
		Here, the cell is mounted on the vacuum system and the magnesium has been evaporated.
		After the cell was sealed-off and detached from the pump, the sensitivity decreased dramatically.
	www.rhunt.f9.co.uk /Glass_Blowing/Mg_Photocell/Mg_Photocell_Page1.htm (1000 words)

Try your search on: Qwika (all wikis)