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Download Date 28/09/2021 20:27:55 Specular Black Baffle Design Sponsored by Raytheon Missile Systems Item Type text; Electronic Thesis Authors Thrasher, Patrick Ambrose Publisher The University of Arizona. Rights Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author. Download date 28/09/2021 20:27:55 Item License http://rightsstatements.org/vocab/InC/1.0/ Link to Item http://hdl.handle.net/10150/322076 Specular Black Baffle Design Final Report 5/7/14 Abstract Raytheon Missile Systems has sponsored this project in order to determine the feasibility of using specular black paint, as opposed to diffuse black paint, as the coating for optical baffles. It is hypothesized that specular baffle designs may reduce stray light more efficiently than diffuse baffles; however, the computer models on which these claims are based have never been validated by experimental data. This project will attempt to prove that computer models of specular baffles are valid. 1 Specular Black Baffle Design Final Report 5/7/14 Team Member Roles Patrick Thrasher, OSE: Team Lead As team lead, Patrick Thrasher organized the roles of the team and oversaw each part of the project. In addition, he performed all of the design and analysis that was done in the FRED computer software. Anthony Babicke, ME: All mechanical manufacturing, paint and assembly was completed by Anthony Babicke. This included the design of the fabrication method, as well as selecting the proper tools, materials, and hardware. Ashley Lancaster, OSE: Ashley Lancaster primarily focused on information synthesis and presentation. This included the specific tasks of risk analysis and ensuring that system requirements are met. Michael Portugal, OSE: All work pertaining to the design and optimization of each baffle was performed by Michael Portugal. This work was performed by hand, in SolidWorks, and in MATLAB. He also was the team scribe, documenting the all of our team meetings and design process. Alexandra Schluntz, OSE: Alexandra Schluntz designed the test setup used to gather data from both baffles systems. In addition, as Purchase Lead, she gathered all materials and handled the finances and budget. 2 Specular Black Baffle Design Final Report 5/7/14 Contents Introduction ............................................................................................................................................ 7 What is a Baffle? .................................................................................................................................. 7 Specular vs. Diffuse Reflection ............................................................................................................. 7 Top-Level Requirements ...................................................................................................................... 8 Top-level Design ...................................................................................................................................... 8 Key Terminology .................................................................................................................................. 8 Optical System ................................................................................................................................. 8 Stray light ........................................................................................................................................ 9 Baffle ............................................................................................................................................... 9 Vane ................................................................................................................................................ 9 FRED ................................................................................................................................................ 9 Computer/FRED model .................................................................................................................... 9 Entrance Pupil (E) ............................................................................................................................ 9 Exit Pupil (E’) .................................................................................................................................... 9 Tube Length (L) ................................................................................................................................ 9 Inner Diameter (D) ........................................................................................................................... 9 Full Field of View (FFOV) .................................................................................................................. 9 F/# ................................................................................................................................................... 9 Irradiance (H) ................................................................................................................................. 10 Point Source Transmittance (PST) .................................................................................................. 10 Bidirectional Reflective Distribution Function (BRDF) ..................................................................... 10 Signal-to-noise Ratio (SNR) ............................................................................................................ 10 Baffle Requirements .............................................................................................................................. 10 Vane Design....................................................................................................................................... 10 F/2, 30° FOV .................................................................................................................................. 10 Paint Application ............................................................................................................................... 11 Isotropic ........................................................................................................................................ 11 5 layer coats .................................................................................................................................. 11 Enamel paint ................................................................................................................................. 11 Assembly ........................................................................................................................................... 11 Aluminum 6061 alloy ..................................................................................................................... 11 633nm optimization....................................................................................................................... 12 3 Specular Black Baffle Design Final Report 5/7/14 Test Requirements ................................................................................................................................ 12 Camera .............................................................................................................................................. 12 Pixel array ...................................................................................................................................... 12 Responsivity ≥ 0.6A/W ................................................................................................................... 12 Variable integration time ............................................................................................................... 12 Detector depth < 1” ....................................................................................................................... 12 Source ............................................................................................................................................... 13 Solar spectrum............................................................................................................................... 13 Extended Source ............................................................................................................................ 13 Hardware and Fasteners .................................................................................................................... 13 Vary the angle of incidence ............................................................................................................ 13 Kinematically constrained baffle .................................................................................................... 13 Room temperature ........................................................................................................................ 14 Summary of PDR Results........................................................................................................................ 14 Subsystem/Sub-assembly and Interface Design ..................................................................................... 14 Reflection Mechanisms ...................................................................................................................... 14 Outline of Baffle Design ....................................................................................................................
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