
	Where results make sense

Topic: Radiant intensity

Related Topics

Intensity

Photometry (optics)

Radiant energy

Luminous intensity

Candela

Power (physics)

Luminance

Steradian

Flux

Photometry

Electromagnetic radiation

In the News (Fri 27 Nov 09)

Northern Trust

Marvin Harrison

Peter Chernin

Gary Locke

Match Play

Penelope Cruz

Mickey Rourke

AR Rahman

Danny Boyle

Hugh Jackman

	Intensity - Open Encyclopedia (Site not responding. Last check: 2007-09-18)
		To find the intensity, take the energy density (that is, the energy per unit volume) and multiply it by the velocity at which the energy is moving.
		The word "intensity" in physics is not synonymous with "strength", "amplitude", or "level", as it sometimes is in colloquial speech.
		where I is the intensity at the surface of the sphere, and r is the radius of the sphere (note: enclosed in parentheses is the expression for the surface area of a sphere).
	open-encyclopedia.com /Intensity (370 words)

	Luminous intensity - Wikipedia, the free encyclopedia
		Luminous intensity should not be confused with luminous flux, which is the total perceived power emitted across all directions.
		Luminous intensity is not the same as the radiant intensity, the corresponding objective physical quantity.
		In 1881, Jules Violle proposed the Violle as a unit of luminous intensity, and it was notable as the first unit of light intensity that did not depend on the properties of a particular lamp.
	en.wikipedia.org /wiki/Luminous_intensity (210 words)

	Spatial Distribution of Radiant Intensity from Primary Sources forAtomic Absorption Spectrometry. Part II: ... (Site not responding. Last check: 2007-09-18)
		The spatial distribution of radiant intensity from electrodelessdischarge lamps used as radiation sources in atomic absorptionspectrometry is investigated with a digital photodiode array imagingsystem.
		Intensity distribution over the radial and longitudinalsections of Pb and Hg lamps is measured for both atomic and ionic linesof the analyte and the filler gas.
		In both lamps, the radial and longitudinalintensity distributions of metal lines are established during the firstminutes after lamp ignition, after which there is a slow and monotonicincrease of the established intensity profiles.
	www.s-a-s.org /journal/96/asv50n4/ASv50n4_sp8.html (403 words)

	[No title] (Site not responding. Last check: 2007-09-18)
		It emits monochromatic radiation with a frequency of 540 x 1012 Hertz (or approximately 555 nm, corresponding with the wavelength of maximum photopic luminous efficiency) and has a radiant intensity (in the direction of measurement) of 1/683 watts per steradian.
		Illuminance is the photometric equivalent of irradiance, whereas luminous exitance is the photometric equivalent of radiant exitance.
		The intensity Iq of each ray leaving the surface at an angle q from the surface normal is given by Lambert’s cosine law: EMBED Equation.2 (15) where In is the intensity of the ray leaving in a direction perpendicular to the surface.
	www.ledalite.com /download/white/photomet.doc (3840 words)

	Spatial Distribution of Radiant Intensity from Primary Sources for AtomicAbsorption Spectrometry. Part 1: Hollow ... (Site not responding. Last check: 2007-09-18)
		The spatial distribution of radiant intensity from hollow cathode lampsused as radiation sources in atomic absorption spectrometry is investigatedusing a digital photodiode array imaging system.
		Intensity distributionover the cross-section of each lamp is measured for both atomic and ioniclines of the analyte and the filler gas.
		Dataon the evolution of the intensity distribution during warm-up of the lampsand under various operating conditions are presented.
	www.s-a-s.org /journal/95/asv49n4/ASv49n4_sp2.html (175 words)

	Calibration & Certification by R. A. Electrical Services
		A surface whose emission or scattering follows Lambert's Cosine Law, in which the radiant intensity leaving a surface is proportional to the cosine of the angle from surface normal.
		The radiant power, at a specified wavelength and band pass that will produce a an output signal from a detector that is equivalent to the inherent noise in that detector.
		A condition wherein the radiant flux density exceeds either or the capacity of a photodetector to emit electrons in a linear relationship to the incident flux and/or the current produced by the detector exceeds the capacity of the electronics to measure the current in a linear fashion.
	www.raelectrical.com /about_us/light-glossary.htm (3545 words)

	metas: Optics
		Since radiation power can be characterised by either detectors or sources, in many cases the spectral composition of the radiation can also be of great importance, so both radiometric and photometric quantities must be measured in various geometrical configurations.
		In the Radiometry Laboratory, the physical quantities of radiation measurement are maintained, and their traceability to the SI units guaranteed through calibration of the relevant measuring instruments and standards.
		The intensity of irradiation or illuminance is particularly suited to the description of the radiation incident on a surface, as well as for the characterisation of radiation detectors.
	www.metas.ch /en/labors/7/7.html (497 words)

	Gigahertz-Optik - Light Measurement Solutions
		• Radiant and luminous intensity, radiance and luminance are quantities which are defined as a function of solid angle, and therefore the detector’s field of view has to be limited to a small angle.
		Similar to radiant and luminous intensity, radiance and luminance can be determined with a goniophotometer, but the detector is placed much closer to the emitting or reflecting surface and the detector’s field of view is limited to a few degrees.
		) with a collimated or conical radiation beam.
	www.gigahertz-optik.com /database_en/html/applications-tutorials/tutorials/iii.-measurement-of-light-with-integral-detectors/iii.1.-the-detector-8217-s-input-optics-and-its-directional-sensitivity.html (2049 words)

	Particle-like wave behaviour (Site not responding. Last check: 2007-09-18)
		By analysing the radiant intensity of electro-magnetic radiation across the whole spectrum at various given temperatures two things are noticed.
		The total radiant intensity across the whole spectrum is a function of T to the fourth power.
		corresponding to a maximum radiant intensity was observed for each given temperature(This was done by turning the wavelength into a function of angle by using a prism) As the temperature of the body increases the wavelength of maximum intensity decreases.
	alpha.qmul.ac.uk /~zgap118/3 (378 words)

	Notes on LEDs (Site not responding. Last check: 2007-09-18)
		Radiant power of a wavelength of 555 nm is multiplied by a factor of 1, but light of higher and lower wavelengths are multiplied by lower factors, until infrared and ultraviolet wavelengths are reached, when the radiant power is multiplied by zero.
		Luminous intensity, however, is flux per unit solid angle, not per unit area, and the luminous intensity of a source in a particular direction does not decrease with increasing distance.
		IR and UV LEDs are measured in watts for radiant flux and watts/steradian for radiant intensity.
	www.gizmology.net /LEDs.htm (3731 words)

	Homepage of Thomas Sabel (Site not responding. Last check: 2007-09-18)
		Compared with a fl radiator the radiant intensity of a grey radiator is decreased by the emissivity.
		By determining the quotient of radiant intensities at two wavelengths the unknown emissivities at each wavelength in the equation can be cancelled out, because it is assumed that the emissivities at neighbouring wavelengths are equal.
		By this technique the background radiation of the flames is excluded and the visual range of the optical fiber is reduced.
	www.ivd.uni-stuttgart.de /hp/ts/sab_pyro.html (557 words)

	Radiant/Luminous Flux and Radiant/Luminous Intensity (Site not responding. Last check: 2007-09-18)
		Radiant/Luminous Intensity is the amount of emitted optical power generated by a light source in a specific direction and conical shape angle directed toward the observer.
		The unit for Radiant Flux is watt (W), and Luminous Flux is lumen(lm).
		The unit for Radiant Intensity is Watt/steradian (W/sr) and Luminous Intensity is Lumens/steradian (lm/sr).
	www.marktechopto.com /products/radiant_flux.cfm (288 words)

	Physikalisch-Technische Bundesanstalt (PTB)
		This instruction is, however, little realistic for practical application, as a lamp with such a limited radiation spectrum is needed practically nowhere for illumination or as a signal lamp.
		The advantage of the definition is that – for this wavelength – it links the photometric unit, luminous intensity, with the radiometric unit, radiant intensity.
		This shows that light is nothing else but optical radiation which becomes visible to the human eye in a certain wavelength range (from 360 nm to 830 nm).
	www.ptb.de /en/wegweiser/einheiten/si/candela.html (396 words)

	Lighting - Glossary (Site not responding. Last check: 2007-09-18)
		Ratio of the absorbed radiant or luminous flux to the incident flux.
		Emission (by atoms, molecules or ions in a material) of optical radiation which, for certain wavelengths or restricted regions of the spectrum, is in excess of the radiation due to thermal emission from the material at the same temperature, as a result of these particles being excited by energy other than thermal agitation.
		Source of radiation the dimensions of which are small enough, compared with the distance between the source and the irradiated surface, for them to be neglected in calculations and measurements.
	mujweb.cz /www/famulights/lightgloss.htm (5220 words)

	Method for full format imaging - Patent 4267261
		The energy is preferably non-coherent radiant energy including electromagnetic, electron and particle energy which may be projected onto said dispersion imaging material simultaneously in the plurality of discrete regions which are to receive the higher amount of energy.
		The short pulse of non-coherent radiant energy from the flash gun passed simultaneously and substantially evenly through the transparent areas of the mask and simultaneously and substantially evenly onto the tellurium film in a full format pattern corresponding to the image represented by the mask.
		Since the commonly used silver halide masters are easily damaged at high intensities of radiant energy, it is preferable that the dispersion of the dispersion imaging material is effected at an intensity level and at a pulse width which in themselves do not damage the silver halide master.
	www.freepatentsonline.com /4267261.html (9970 words)

	radiant intensity - a Whatis.com definition (Site not responding. Last check: 2007-09-18)
		Radiant intensity is a quantitative expression of the brilliance of a source of electromagnetic (EM) energy over the entire
		This quantity is measured in terms of the power emitted per unit solid angle from an isotropic radiator, a theoretical point source that radiates equally in all directions in three-dimensional space.
		The standard unit of radiant intensity is the watt per steradian (W/sr or W ?
	whatis.techtarget.com /definition/0,,sid9_gci769928,00.html (159 words)

	International Light - Glossary
		One candlepower (cp) was the luminous intensity of a standard candle made of whale wax, weighing 1/6 lb, 7/8 in.
		Radiant energy arriving at a surface per unit area, usually expressed in joules or millijoules per square centimeter (J/cm² or mJ/cm²).
		Radiant power emitted into a full sphere (4p steradian) by a unit area of a source, expressed in W/m².
	www.intl-light.com /library/glossary (3699 words)

	[No title]
		RADIANCE (L) For a parallel beam it is the radiant power, P, of all wavelengths leaving or passing through an infinitesimal element of surface in a given direction from the source divided by the orthogonally projected area of the element in a plane normal to the given direction of the beam,
		RADIANT EXITANCE (M) The radiant power, P, emitted at all wavelengths by an element of the surface containing the source point under consideration divided by the surface area (S) of that element.
		Transfer of excitation energy by radiative deactivation of a donor molecular entity and reabsorption of the emitted light by an acceptor molecular entity.
	pages.unibas.ch /epa/glossary/R.htm (1169 words)

	MSI - Glossary_R
		Evaluation of the echoes appearing on the radar screen in terms of orientation, coverage, intensity, tendency of intensity, height, movement and unique characteristics that may be indicative of certain types of weather including severe storms and of anomalous propagation.
		Quotient of the radiant intensity, in the given direction, of an infinitesimal element of the surface containing the point under consideration, by the area of the orthogonal projection of this element on a plane perpendicular to the given direction.
		Diagram for calculating the long-wave radiation flux in the atmosphere from the distributions of temperature and of the main absorbing and emitting constituents of the atmosphere (water vapour and carbon dioxide).
	www.msc-smc.ec.gc.ca /education/msi/glossary/glossary_r_e.html (3859 words)

	LSU EE 4770 Lecture Notes
		Its radiant flux is = 1 W. Find the radiant intensity and irradiance at a distance of 1 m and 3:048 m.
		Note that radiant intensity is independent of distance.
		Its radiant flux is e 555 nm = 1 W. Find the luminous flux, illuminance, and luminous intensity at a distance of 1 m and 3:048 m.
	www.ece.lsu.edu /ee4770/1997/lsli08.html (2253 words)

	Candela - Physics Help and Math Help - Physics Forums
		The radiant intensity is the radiant flux emitted per unit of solid angle by a point source in a given direction.
		Intensity is very often confused with irradiance, which is the flux per unit area.
		Radiant flux is the rate at which radiant energy is passing through the surface.
	www.physicsforums.com /showthread.php?t=41410 (1221 words)

	Ultraviolet terms and uv definitions (Site not responding. Last check: 2007-09-18)
		Radiant energy (Q) is a total amount of radiant emission (J) from a source over a given period of time.
		Note that in a non-absorbing medium the radiant intensity does not fall off with distance.
		The irradiance is often termed "light intensity" o" this is incorrect o" see the proper definition of "radiant intensity" above.
	www.boltonuv.com /define.html (1263 words)

	Gamma FAQ - Frequently Asked Questions about Gamma
		Radiant intensity potentially has a large spatial extent, but imaging systems use pixels with small area: It is inappropriate to use intensity as a metric for image data.
		In physics, radiant intensity and radiance are integrated across a wide range of wavelengths.
		Radiant intensity, weighted by the spectral sensitivity associated with the brightness sensation of vision, is luminous intensity.
	www.poynton.com /notes/colour_and_gamma/GammaFAQ.html (4144 words)

	hf/rfZONE Product Review: Vishay TSH6200/TSMG3700 High-Speed/Power IR Emitters
		Radiant intensity is 180 mW/sr at a forward current of 100 mA, while the 5-mm package provides a ±10° angle of half intensity.
		This surface-mount emitter combines a ±60° angle of half intensity with a radiant intensity of 10 mW/sr and is easily mounted to printed circuit boards using automatic placement equipment.
		With a ±10° angle of half intensity and a shorter wavelength than conventional IR emitting diodes (850 nm instead of 870 nm) this is going to be a no-brainer choice for the illumination needs for CMOS-sensor equipped cameras.
	www.analogzone.com /hfp_0809.htm (486 words)

Try your search on: Qwika (all wikis)