Data format standard for sharing light source measurements

G. Groot Gregory; Ian Ashdown; Willi Brandenburg; Dominique Chabaud; Oliver Dross; Sanjay Gangadhara; Kevin Garcia; Michael Gauvin; Dirk Hansen; Kei Haraguchi; Günther Hasna; Jianzhong Jiao; Ryan Kelley; John Koshel; Julius Muschaweck

doi:10.1117/12.2021670

30 September 2013 Data format standard for sharing light source measurements

G. Groot Gregory, Ian Ashdown, Willi Brandenburg, Dominique Chabaud, Oliver Dross, Sanjay Gangadhara, Kevin Garcia, Michael Gauvin, Dirk Hansen, Kei Haraguchi, Günther Hasna, Jianzhong Jiao, Ryan Kelley, John Koshel, Julius Muschaweck

Author Affiliations +

Proceedings Volume 8835, LED-based Illumination Systems; 88350D (2013) https://doi.org/10.1117/12.2021670
Event: SPIE Optical Engineering + Applications, 2013, San Diego, California, United States

Abstract

Optical design requires accurate characterization of light sources for computer aided design (CAD) software. Various methods have been used to model sources, from accurate physical models to measurement of light output. It has become common practice for designers to include measured source data for design simulations. Typically, a measured source will contain rays which sample the output distribution of the source. The ray data must then be exported to various formats suitable for import into optical analysis or design software. Source manufacturers are also making measurements of their products and supplying CAD models along with ray data sets for designers. The increasing availability of data has been beneficial to the design community but has caused a large expansion in storage needs for the source manufacturers since each software program uses a unique format to describe the source distribution. In 2012, the Illuminating Engineering Society (IES) formed a working group to understand the data requirements for ray data and recommend a standard file format. The working group included representatives from software companies supplying the analysis and design tools, source measurement companies providing metrology, source manufacturers creating the data and users from the design community. Within one year the working group proposed a file format which was recently approved by the IES for publication as TM-25. This paper will discuss the process used to define the proposed format, highlight some of the significant decisions leading to the format and list the data to be included in the first version of the standard.

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G. Groot Gregory, Ian Ashdown, Willi Brandenburg, Dominique Chabaud, Oliver Dross, Sanjay Gangadhara, Kevin Garcia, Michael Gauvin, Dirk Hansen, Kei Haraguchi, Günther Hasna, Jianzhong Jiao, Ryan Kelley, John Koshel, and Julius Muschaweck "Data format standard for sharing light source measurements", Proc. SPIE 8835, LED-based Illumination Systems, 88350D (30 September 2013); https://doi.org/10.1117/12.2021670

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KEYWORDS

Computer aided design

Light sources

Data modeling

Ray tracing

Optical design

Light emitting diodes

Binary data

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