Modeling filament-based sources for system tolerancing

Michael A. Stevenson, Michael E. Frate, Mark S. Kaminski, R. John Koshel

Research output: Contribution to journalConference articlepeer-review

3 Scopus citations


This paper discusses the reverse engineering of filament-based light sources for computerized optical analysis purposes, especially problems raised by source tolerances. The H12 automotive headlamp bulb is used as a case study. Notes on reverse engineering sources consist of: a statement of the challenges involved, our source-modeling methodology, and useful values and procedures pertaining to simulated sources and optical ray-tracing software. A multi-model approach is outlined and consists of: gathering tolerance information from specification sheets, modeling for source tolerances with eight key models, and output comparisons between nominal and "toleranced" versions of the H12 source. Recommendations for including source tolerances in non-imaging illumination designs conclude.

Original languageEnglish (US)
Pages (from-to)67-77
Number of pages11
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 2002
EventModeling and Characterization of Light Sources - Seattle, WA, United States
Duration: Jul 8 2002Jul 9 2002


  • ASAP
  • Automotive
  • Filament
  • Illumination
  • Reflector
  • Rhinoceros
  • Simulation
  • Source
  • Tolerance
  • Tolerancing

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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