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TIRS Status

TIRS Status. TIRS Overview. TIRS (Earthshield Stowed). TIRS (Earthshield Deployed). Cryocooler Radiator. Blackbody Cal Radiator. Telescope Radiator. Scene Select Mechanism. Structure. Nadir (Earth) View. External Alignment Cube. Earth Shield. Focal Plane Electronics.

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TIRS Status

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  1. TIRS Status

  2. TIRS Overview TIRS (Earthshield Stowed) TIRS (Earthshield Deployed) Cryocooler Radiator Blackbody Cal Radiator Telescope Radiator Scene Select Mechanism Structure Nadir (Earth) View External Alignment Cube Earth Shield Focal Plane Electronics Spacecraft Interface Flexures (2 of 3)

  3. TIRS on LDCM Spacecraft OLI • Quantum well infrared photodetector (QWIP) focal plane array (built at GSFC), at 43K • 2-Channel IR spectral imager • 10.8 mm and 12 mm • Split window atmospheric correction • Two full aperture calibration sources • Onboard blackbody • Space view • Calibration every 34 minutes • Scene select mirror selects between calibration sources, nadir • 185 km ground swath (15° FOV) • 100 meter resolution • TIRS delivery December 2011 • 3.25 year life, Class C instrument Deployable Earth Shield (Stowed) Cryocooler Electronics MEB X Y Z

  4. Accomplishments Completed • Focal Plane Array • Telescope • Focal Plane Electronics • Scene Select Mechanism • Structure • Earth Shield Mechanism • Cryocooler Nearly Completed • Main Electronics Box

  5. TIRS Flight Hardware Scene Select Mechanism Focal Plane Array Primary Structure with Radiators and Earth Shield Focal Plane Electronics Telescope

  6. Status of subsystems • Cryocooler Completed: EMI, vibration, thermal vac testing Exported vibration characterization Successful PSR March 30, 2011 Shipping expected 2nd week of April • Main Electronics Box • Completed: Flight board assembly • Ongoing: Functional testing, delivery June 2011

  7. Status of Integration and Testing (I&T) • Integration: • FPA to Telescope to FPE – completed March 2011 • Testing • Focus testing complete, meets requirements • Initial Calibration – nearly completed - April 2011 • Spatial • Spectral • Radiometric • Scattering • Stray Light Calibration Ground Support Equipment (GSE)* * Uses NIST-traceable blackbody

  8. Preliminary Signal-to-Noise Viewing a 280 K Extended Blackbody using engineering model electronics SCA-A (Q020) SCA-B (Q024) Dark Band 10 um Band SNR ~ 1000 SNR ~ 900 SNR ~ 900 SNR ~ 800 12 um Band ~ 36 unvignetted rows SNR ~ 900 ~ 36 unvignetted rows SNR ~ 1000 ~ 18 dark rows SCA-C (Q023) • Initial data using flight electronics showing SNR ~ 900 when viewing 260k blackbody

  9. 10.8 micron Spectral Uniformity map Used measured responses of filter and QWIP: White (1) = Pass all requirements Black (0) = Fails at least one requirement Q020 Q023 Q024 • Can always find perfect row or combine rows to create a perfect row • Science regions shown as rectangles above • 2 rows per QWIP will be chosen

  10. 12 micron Spectral Uniformity map Used measured responses of filter and QWIP: White (1) = Pass all requirements Black (0) = Fails at least one requirement Q020 Q023 Q024 • Can always find perfect row or combine rows to create a perfect row • Science area shown as rectangles above • 2 rows per QWIP will be chosen

  11. TIRS Focus Procedure Calibration Ground Support Equipment (CGSE) TIRS FPA Telescope BB Source …record change in TIRS spot size Vary CGSE Focus… • Focus offset used to define shims • Focus adjusted using shims, telescope temperature • TIRS meets focus requirements

  12. TIRS Schedule • TIRS delivery currently November 2011 • Preserves 22 days of schedule slack against delivery date • Delivery date: December 31, 2011

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