Optical modeling of bullet-shaped LED for use in self-luminous traffic signs

Ted L. Lee, Yi Chun Chen, Ming Siou Tsai, Ching Cherng Sun

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

Bullet-shaped LEDs are commonly used in self-luminous traffic signs as LED-dotted matrices due to their low cost, simplicity, robustness, and ease of installation. We proposed a simple low-cost method that creates a model suitable for the high manufacturing tolerance found in bullet-shaped LEDs. The method starts from measuring multiple one-dimensional angular intensity patterns at interested distances from multiple LEDs to form a database, including distances at 10, 15, 20, 25, 35, 50, and 100 mm. Their normalized cross-correlations are then calculated to find the batch that has the most similarity and base our model off that batch. Finally, we validate the model via Monte Carlo simulations in comparison to the original one-dimensional angular intensity patterns in the database. The platform demonstrated to obtain an average of 99% in normalized cross correlation between different batches of the same model LED, and a model of that LED is currently under development.

Original languageEnglish
Title of host publicationCurrent Developments in Lens Design and Optical Engineering XVIII
EditorsVirendra N. Mahajan, Simon Thibault, R. Barry Johnson
PublisherSPIE
ISBN (Electronic)9781510612075
DOIs
StatePublished - 2017
EventCurrent Developments in Lens Design and Optical Engineering XVIII 2017 - San Diego, United States
Duration: 7 Aug 20178 Aug 2017

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume10375
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceCurrent Developments in Lens Design and Optical Engineering XVIII 2017
Country/TerritoryUnited States
CitySan Diego
Period7/08/178/08/17

Keywords

  • Bullet packaging
  • Dome package
  • LED
  • Midfield
  • Modeling
  • Traffic signs

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