Abstract
In this paper, the fisheye camera method is validated for spatial non-uniformity corrections in luminous flux measurements with integrating spheres. The method was tested in eight integrating spheres with six LED lamps, and the determined angular intensity distributions and spatial non-uniformity correction factors were compared with the results of five goniophotometers. The average closeness score, describing the similarity between any two distributions, was 94.6 out of 100 for the distributions obtained using the fisheye camera method when compared with the goniophotometric results. The average closeness score for the five goniophotometers, when each goniophotometer was compared with the other four, was . On average, the relative deviation between the two methods was 0.05% when calculating the spatial corrections. The most significant sources of uncertainty for the fisheye camera method were large, view-obstructing sphere elements residing close to the camera port.
Highlights
The angular intensity distribution describes the far-field radiation pattern of a light source
In this paper, the fisheye camera method is validated for spatial non-uniformity corrections in luminous flux measurements with integrating spheres
The method was tested in eight integrating spheres with six LED lamps, and the determined angular intensity distributions and spatial non-uniformity correction factors were compared with the results of five goniophotometers
Summary
The angular intensity distribution describes the far-field radiation pattern of a light source It is one of the key metrics of a lighting product, and such distributions are frequently measured during the development stage of new lamps and luminaires. Among their other applications, relative angular intensity distributions are used in luminous flux measurements [1] with integrating spheres to reduce measurement uncertainty due to the spatial non-uniformity of the sphere [2,3,4,5,6,7,8,9]. Goniophotometers are usually expensive and require a large amount of dedicated laboratory space: besides the footprint and the floor-to-ceiling height required by the instrument, a non-obscured line of sight must be ensured between the DUT and the detector
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