measurement of absolute luminous intensity distributions
Read Online
Share

measurement of absolute luminous intensity distributions

  • 336 Want to read
  • ·
  • 42 Currently reading

Published by Central Bureau of the CIE in Vienna .
Written in English

Subjects:

  • Lighting -- Tables, calculations, etc.,
  • Photometry

Book details:

Edition Notes

Includes bibliographical references.

StatementInternational Commission on Illumination.
SeriesPublication CIE -- no. 70
Classifications
LC ClassificationsTH7725 I546 1987
The Physical Object
Paginationx, 44 p. :
Number of Pages44
ID Numbers
Open LibraryOL14902199M
ISBN 103900734054, 9637251960

Download measurement of absolute luminous intensity distributions

PDF EPUB FB2 MOBI RTF

Asim Kumar Roy Choudhury, in Principles of Colour and Appearance Measurement, Luminous intensity. In photometry, luminous intensity is a measure of the wavelength-weighted power emitted by a light source in a particular direction per unit solid angle, based on the luminosity function. Photometry deals with the measurement of visible light as perceived by human eyes. Measurement of Absolute Luminous Intensity Distributions (E) active, Most Current Buy Now. Details. History. References Status: active: Page Count: Document History. CIE 70 January 1, Measurement of Absolute Luminous Intensity Distributions . realization, measurement results of two types of lamp artefacts by each absolute IS photometer are compared with those by a goniophotometer that is currently declared as the primary method for the KRISS luminous-flux scale. Since the two absolute IS photometers as well as the goniophotometer 70 75 80 85 90 95 Cited by: 2. LUMINOUS INTENSITY: 1 lm/sr (lumens per steradian) = 1 candela (cd) = 4*p lumens (isotropic) = x watts/sr at nm. Converting Between Geometries Converting between geometry-based measurement units is difficult, and should only be attempted when it is impossible to measure in the actual desired units.

The Lighting Handbook Luminous flux The luminous flux describes the quantity of light emitted It is a measure of a light source's economic efficiency. Luminous intensity The luminous intensity describes the quantity of light that is radiated in a particular direction. This is a useful measure-.   [1] CIE The Measurement of Absolute Luminous Intensity Distributions [2] CIE Measurement of Luminous Flux [3] CIE The Photometry and Goniophotometry of Luminaires [4] CIE Photometry Using V(λ)- Corrected Detectors as . The luminous-flux unit, the lumen, is realized by means of an integrating sphere with an opening calibrated by a luminous-intensity standard placed outside. The adapted experimental setup permits one to measure luminous-flux values between 5 and lm with a significant improvement with respect to the simulated performances reported in the. One method of determining luminous intensity I v involves calibrating the detector in illuminance E v and calculating luminous intensity using the inverse square law: E v = I v /r 2. Apart from maintaining the far-field condition, the validity of this calculation requires the precise measurement of the distance r between the detector and LED.

Measurement of luminous intensity distribution The measurement of luminous intensity distribution is described in a separate Technical Report of the CIE. That report contains information about goniophotometers used for the measurement of luminous intensity distribution as well as data about the execution of the measurements. The coordinates systems used for the measurement and representation of luminous intensity distributions are described. Types of goniophotometers, possibilities for angle encoding, characteristics of the photo-electronic system, and data acquisition and processing for measurements of luminous intensity distributions are discussed in detail. Luminous intensity quantifies the luminous flux emitted by a source in a certain direction and is measured in lumens per solid angle or candela (cd). A uniform light distribution is assumed. To comply with photometric principles the measurement distance between source and detector must be at least 10 times the maximum dimension of the source. It is a measure of a light source’s economic efficiency. Luminous intensity The luminous intensity describes the quantity of light that is radiated in a particular direction. This is a useful measure-ment for directive lighting elements such as reflectors. It is represented by the luminous intensity distribution .