Results 251 to 260 of about 6,294 (295)

Luminous flux amplification in Fabry-Perot spectrometry

Applied Optics, 1978
Formulas are derived that enable a comparison, for a given resolution, between the luminosity of a grid Fabry-Perot spectrometer and that of a conventional Fabry-Perot spectrometer.
H, Dupoisot, R, Prat, S, Slansky
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Micromechanical deflector of luminous fluxes

Journal of Optical Technology, 2007
This paper discusses the operating principles and attainable parameters of micromechanical multielement mirrors suitable for dynamic continuous control of the position of optical rays in space, using magnetic fields to do this.
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Luminous flux and luminous efficacy of black-body radiation: an analytical approximation

Solar Energy, 2002
Analytical expressions for calculation of luminous flux and luminous efficacy corresponding to a given radiant flux with black-body spectrum are presented. The results are directly applicable to extraterrestrial solar radiant flux and likewise to any other light source with a spectral distribution roughly equal to a black-body spectrum.
V. Lampret, J. Peternelj, A. Krainer
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Evidence for a peritubular-to-luminal flux phosphate in the dog kidney

American Journal of Physiology-Renal Physiology, 1977
The possible presence of a direct influx of phosphate into the tubular lumen of the dog kidney was examined by two different techniques. A 0.3-ml bolus of 32PO4 and [3H]inulin was injected into the renal artery of dogs with and without phosphate loading.
E G, Schneider, L A, McLane
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Luminous Flux, Luminous Intensity, Quantity of Light

1971
Light sources emit energy in the form of electromagnetic waves which spread out in all directions. The amount of energy radiated during a unit of time (the power) may be expressed in physical units as ergs per second, or in watts. Apart from the total energy, we may also consider the amount of energy passing through a certain part of a plane, or within
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Measurement of Luminous Flux, Quantity of Light, and Luminous Emittance

1971
Towards the end of the last century it was gradually realised that the correct quantity characterising a light source is not the luminous intensity, but the total luminous flux. Until then no other method of determining luminous flux was known than that of computing it from the light distribution.
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Sixth Comparison of National Standards of Luminous Intensity and of Luminous Flux (1985)

Metrologia, 1987
Fifteen national laboratories participated in the comparison, using standard lamps of two different types for the comparison of luminous intensity and of a single type for that of luminous flux. The results, the first obtained since the adoption of the new definition of the candela, show only slight improvement in the agreement between the laboratories.
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Dependence of luminous flux on light source position

2015 16th International Scientific Conference on Electric Power Engineering (EPE), 2015
The aim of the paper is to find out how the luminous flux of fluorescent lamps depends on the change of the source position. Linear fluorescent lamps, compact fluorescent lamps and circular fluorescent lamps were used for measurement. Linear and circular fluorescent lamps were measured in the horizontal and vertical position, the compact fluorescent ...
Jaroslav Stepanek, Jan Skoda
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Realization of the NML Scale of Total Luminous Flux

Metrologia, 1979
Transfer of the National Measurement Laboratory's photometric scales to a radiometric base has been completed by using a new precision goniophotometer to realize a scale of total luminous flux from the previously established scale of illuminance. The uncertainties in the goniophotometry are well below those in the scale of illuminance.
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luminous flux

2011
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