Efficient measurement of large light source near-field color and luminance distributions for optical design and simulation

Hubert Kostal; Douglas Kreysar; Ronald Rykowski

doi:10.1117/12.826261

21 August 2009 Efficient measurement of large light source near-field color and luminance distributions for optical design and simulation

Hubert Kostal, Douglas Kreysar, Ronald Rykowski

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Proceedings Volume 7429, Novel Optical Systems Design and Optimization XII; 742908 (2009) https://doi.org/10.1117/12.826261
Event: SPIE Optical Engineering + Applications, 2009, San Diego, California, United States

Abstract

The color and luminance distributions of large light sources are difficult to measure because of the size of the source and the physical space required for the measurement. We describe a method for the measurement of large light sources in a limited space that efficiently overcomes the physical limitations of traditional far-field measurement techniques. This method uses a calibrated, high dynamic range imaging colorimeter and a goniometric system to move the light source through an automated measurement sequence in the imaging colorimeter's field-of-view. The measurement is performed from within the near-field of the light source, enabling a compact measurement set-up. This method generates a detailed near-field color and luminance distribution model that can be directly converted to ray sets for optical design and that can be extrapolated to far-field distributions for illumination design. The measurements obtained show excellent correlation to traditional imaging colorimeter and photogoniometer measurement methods. The near-field goniometer approach that we describe is broadly applicable to general lighting systems, can be deployed in a compact laboratory space, and provides full near-field data for optical design and simulation.

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Hubert Kostal, Douglas Kreysar, and Ronald Rykowski "Efficient measurement of large light source near-field color and luminance distributions for optical design and simulation", Proc. SPIE 7429, Novel Optical Systems Design and Optimization XII, 742908 (21 August 2009); https://doi.org/10.1117/12.826261

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KEYWORDS

Light sources

Near field

Imaging systems

Optical design

Headlamps

Optical testing

Control systems

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