Innovative software simulation techniques to design specular curved baffle designs in ground-and space-based telescopes

Yitian Ding, Frederick Bushroe, Stanley Pau, Michael Gauvin

Research output: Chapter in Book/Report/Conference proceedingConference contribution


We investigated several curved vane baffle designs coated with specular black paint as an inexpensive manufacturing alternative to traditional diffuse baffles vanes to reduce stray light and heat due to absorption in a standard Cassegrain telescope design configuration. The heat absorption is a very large problem in infrared systems and the specular designs solve this part of the problem. Our study involved simulating two different types of baffle systems, diffuse and specular painted vanes on the main barrel baffle. The first type of baffle consisted of evenly and non-evenly spaced diffusely black coated straight planar vanes on the main barrel baffle and a second type using specular black paint on curved vanes. TracePro, a stray light simulation software from Lambda Research Corporation, was used to simulate and compare each of the nine baffle systems for stray light rejection. The diffuse black painted straight vane baffle design was used as the baseline design to compare results to the other eight designs. In all designs except for the baseline design, TracePro's local downhill simplex optimization method was used to optimize each vane curvature and spacing in the main barrel baffle to reject incoming stray light. These curved vanes were designed to reject stray light back out of the main barrel baffle rather than to be absorbed by diffuse black paint.

Original languageEnglish (US)
Title of host publicationOptical Modeling and System Alignment
EditorsMark A. Kahan, Jose Sasian, Richard N. Youngworth
ISBN (Electronic)9781510628991
StatePublished - 2019
EventOptical Modeling and System Alignment 2019 - San Diego, United States
Duration: Aug 12 2019Aug 13 2019

Publication series

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


ConferenceOptical Modeling and System Alignment 2019
Country/TerritoryUnited States
CitySan Diego


  • Baffles
  • Curved Vanes
  • Diffuse Baffles
  • Ray Tracing Software
  • Scatter
  • Simulation
  • Specular Baffles
  • Stray Light
  • TracePro
  • Vanes

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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