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Wireless TPS Sensors

This report outlines the design and implementation of a wireless sensor system intended for integration into NASA's Thermal Protection System (TPS) for entry vehicles. With the inherent challenges of the re-entry environment and high risk of adding wired sensors, the wireless system aims to simplify installation, reduce mass, and enhance mission safety. The report details specifications for various sensor types, budget considerations across three design prototypes, schedules, potential challenges such as RF interference and design packaging, and concludes with a recommendation based on versatility and simplicity.

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Wireless TPS Sensors

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  1. Wireless TPS Sensors Chris Johnson Jesse Pentzer Brandy Holmes John Sochacki Lucus Wells

  2. Outline • Background • Needs/Specs • Designs • Design 1 • Design 2 • Design 3 • Trade Study • Sensors • Budget • Schedule • Challenges • Conclusion • Acknowledgments

  3. Background • The re-entry environment is extremely difficult to model. • NASA Ames desires a wireless sensor system that can be integrated into the Thermal Protection System (TPS) of entry vehicles. • Complications with adding extra wiring and the risk involved in adding sensors to the mission. • A wireless sensor system would remove wiring complexities, reduce mass, and reduce risk associated with cable cutting. • With a greater understanding of the environment encountered during atmospheric re-entry the TPS of future missions could be made safer and more efficient.

  4. Needs/Specifications

  5. Design One

  6. Design One

  7. Design Two

  8. Design Two

  9. Design Three

  10. Design Three

  11. Design Three

  12. Trade Study

  13. Sensors • Omega Type K Thermocouples with Glass Braid Insulation • Range: -270 to 1372 °C • Uncertainty: Greater of 2.2 °C or 0.75% • Cost: $33 for five thermocouples with one meter leads • Honeywell ASDX-DO Series Pressure Sensors • Range: 0 to 30 psi absolute • Uncertainty: 2.0% Full Scale • Temperature Range: -20 to 105 °C • Cost: $33.27 Each • Omega Thin Film Resistance Thermal Detectors • Range: -70 to 500 °C • Uncertainty: Dependent on Calibration Equation • Cost: $47.50 for pack of five

  14. Budget • Common Cost to all designs:$679.16 • Design One • 9 PCB’s • 9 Batteries • 9 X-Bee chips • Total Cost: $1333.91 • Design Two • 11 PCB’s • 3 Batteries • 3 X-Bee’s • Total Cost: $1137.41 • Design Three • 11 PCB’s • 5 Batteries • 5 X-Bee’s • Total Cost: $1222.91 • Thermal Exposure’s Budget: $2240

  15. Schedule

  16. Challenges • Code Complexity • RF Opaque Materials • Design Packaging for Harsh Landing Conditions • Thermal Protection of Circuit

  17. Conclusions • Thermal Exposure’s Favorite? • Design One!!! • Why? • Versatility • Simplicity of Code • Simplicity of Design • Small Size and Weight

  18. Acknowledgments • Faculty Advisors • David Atkinson • Steve Beyerlein • Mentors • Greg Swanson • Tye Reid • Justin Schlee • NASA Ames • David Hash • Johnny Fu • Ed Martinez

  19. Questions?

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