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Thermodynamic Modeling o f Astronomical Infrared Instruments

Thermodynamic Modeling o f Astronomical Infrared Instruments. Francesc Andre Bertomeu Hartnell College Salinas, California. Research Advisor: James Larkin Research Supervisors: Michael McElwain and Shelley Wright University of California Los Angeles.

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Thermodynamic Modeling o f Astronomical Infrared Instruments

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  1. Thermodynamic Modeling o f Astronomical Infrared Instruments Francesc Andre Bertomeu Hartnell College Salinas, California Research Advisor: James Larkin Research Supervisors: Michael McElwain and Shelley Wright University of California Los Angeles This project is supported by the National Science Foundation Science and Technology Center for Adaptive Optics, managed by the University of California at Santa Cruz under cooperative agreement No. AST - 9876783.

  2. Infrared Instrumentation and Applications Star Trek Lt. Cmdr Geordi LaForge Military http://www.ir55.com/ Astrophysics & Astronomy

  3. Importance of Cryogenics In Astronomical Infrared Instruments Problems Astronomical targets are faint. Warm instruments are bright. Everything above zero Kelvin emits thermal radiation (including infrared light). 4. Heat = Light. Solutions Cool instruments to cryogenic temperatures Predict Thermodynamic behavior I.E. Thermodynamic Modeling

  4. O.S.I.R.I.S. OH-Suppressing Infra-Red Imaging Spectrograph • Designed for Keck AO system • The most sensitive infrared spectrograph • OSIRIS saw first light on Feb 22-23 Well, he gave me a speeding ticket when I told him it was technically a blue-shifted light So he didn’t ticket you after running the red light?

  5. O.S.I.R.I.S. Continued Consists of 1. Optics and detector 2. Dewar 3. Cooling System (Closed-Cycle Refrigerator) 4. Hydraulic lifting mechanism

  6. O.S.I.R.I.S. Continued Consists of 1. Optics and detector 2. Dewar 3. Cooling System (Closed-Cycle Refrigerator) 4. Hydraulic lifting mechanism

  7. O.S.I.R.I.S. Continued Consists of 1. Optics and detector 2. Dewar 3. Cooling System (Closed-Cycle Refrigerator) 4. Hydraulic lifting mechanism

  8. The Thermal Model Simplified algorithm Calculate heat flow through conduction and radiation for each internal component Conduction = k(A/L) (TH - TC ) Radiation & Absorption = ;EAT4 Pwr = Net power of System 2. Determine new temperatures } Q = cm#T (J) Q(t) = Pwr*t Pwr = Q/t (J/s) Tf = (Pwr*t)/cm + Ti

  9. The Code • Written in IDL • Passes in Variables • Results are Plotted IDL Program

  10. My Project Update the Model to Reflect Changes Adjust Parameters to fit real Data Apply Finished Model to IRIS

  11. My Project Update the Model to Reflect Changes • Dewar & Shields • Gold Capton • Copper Strapping (Radiation & Absorption = ;EAT4) (Conduction = k(A/L) (TH - TC ))

  12. My Project Update the Model to Reflect Changes

  13. My Project 2. Adjust Parameters to fit real Data

  14. My Project 2. Adjust Parameters to fit real Data

  15. My Project 2. Adjust Parameters to fit real Data • A/L values for Copper • Thermal Conductivity for Aluminum • Emissivity Conduction = k(A/L) (TH - TC ) Radiation & Absorption = ;EAT4

  16. My Project 2. Adjust Parameters to fit real Data

  17. Applications • Applied to IRIS (design phase) • 30 Meter Telescope http://www.astro.caltech.edu/observatories/tmt/renders.html

  18. My Project 3. Applying Finished Model to IRIS • 4 X Osiris all the way around • Mass, Areas, Lengths, 4 CCR’s

  19. Results Osiris • 234 hrs to Cool • 2 hr brown out = 25 hr recovery • 3 hr brown out = 39 hrs recovery Iris • 223 hrs to Cool • 2 hr brown out = 10 hr recovery • 3 hr brown out = 21 hrs recovery

  20. Conclusion • Previous model was updated to reflect changes • made during construction OSIRIS • Final product was be adapted to model the behavior of • next generation of integral field spectrographs • Program is important for predicting cryogenic • behavior of cryogenic instruments.

  21. Acknowledgements • CfAO Members and Staff • Research Advisor: James Larkin • Research Supervisors: Michael McElwain and Shelley Wright • UCLA IR Lab This project is supported by the National Science Foundation Science and Technology Center for Adaptive Optics, managed by the University of California at Santa Cruz under cooperative agreement No. AST - 9876783.

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