Luminous flux measurement

Gentile, Camillo; Rastello, María Luisa; Rossi, G.; Soardo, P.

doi:10.1177/096032718802000406

Cited by 12 publications

(3 citation statements)

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“…Frederiksen 14 looked at issues with the consistency of measured luminous intensity distributions, while research continued on determining the optimum test distance for goniophotometry of focused luminaires. 15,16 Gentile et al 17 studied the uncertainty of luminous flux measurement on a goniophotometer. De Visser and van der Woude 18 used mathematical modelling to optimise several aspects of the construction of an integrating sphere.…”

Section: Smentioning

confidence: 99%

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Fifty years of development of light measurement instrumentation

Bergen¹,

Young

2018

Lighting Research & Technology

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Instrumentation for photometry, radiometry and colorimetry has developed significantly over the past fifty years. New measurement techniques and types of detectors as well as miniaturisation of computers and electronic hardware have fundamentally changed both the size, design and complexity of instrumentation and the way that we go about our measurement work. There has also been a significant change in mindset as the increasing need for accountability for measurement results and recognition of the role of traceability and measurement uncertainty have become more pronounced. This paper summarises the state of photometric laboratories in the 1960s and list some of the key highlights in the development of instrumentation and measurement techniques since then. It is not intended as a strict chronological account of technological invention, but a reflection of how and when these technologies were adopted and adapted to light measurements, along with accompanying key papers published in Lighting Research and Technology and associated journals over that time.

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Section: Smentioning

confidence: 99%

“…15,16 Gentile et al. 17 studied the uncertainty of luminous flux measurement on a goniophotometer. De Visser and van der Woude 18 used mathematical modelling to optimise several aspects of the construction of an integrating sphere.…”

Section: 1980smentioning

confidence: 99%

Fifty years of development of light measurement instrumentation

Bergen¹,

Young

2018

Lighting Research & Technology

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“…Near-field goniometry has indeed been known to offer a valuable alternative to far-field goniophotometry. [10][11][12][13][14][15][16][17][18][19] In a nearfield luminance goniometer, an illuminance meter and a luminance camera revolve around the light source. The luminance camera captures luminance maps 20,21 and the illuminance meter provides the absolute reference luminous flux data.…”

Section: Introductionmentioning

confidence: 99%

Near-field and far-field goniophotometry of narrow-beam LED arrays

Jacobs

Forment

Rombauts

et al. 2014

Lighting Research & Technology

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In lighting calculations and simulations, the emission of a light source is conventionally modeled using the far-field luminous intensity distribution. However, the advent of luminaires including large arrays of LEDs with focusing optics creating narrow beams has made the traditional limiting photometric distance to reach far-field conditions less easy to determine. Furthermore, even correct far-field data can lead to erroneous predictions when illuminances are determined on a task surface which is positioned within the near-field region. A near-field representation could overcome these problems, but experimental validation for such LED arrays is lacking. This paper reports on near-field and farfield laboratory experiments using an array of two and five narrow-beam LEDs. A near-field approach makes discussions to determine the far-field photometric distance superfluous and leads to correct illuminances at any location with respect to the array, irrespective of the dimensions of the array and the beam angle of the individual components. Introducing the near-field representation of light sources in lighting design offers more accurate predictions when luminaires based on LED arrays with focusing optics are involved.

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