Ames Research Center Airborne Sensor Facility Hemisphere Calibration Effects on calibration –Stray Light – Shield Starting with Crystal –Stable Supply.

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Presentation transcript:

Ames Research Center Airborne Sensor Facility Hemisphere Calibration Effects on calibration –Stray Light – Shield Starting with Crystal –Stable Supply and Selected bulbs - Crystal –Warm-up Time – Operational issue –Humidity – Improvement possible –Temperature –Optics Degradation Deployment Results –Crystal, Texas 2002, Thorpex

Ames Research Center Airborne Sensor Facility Hemisphere Monitor Diode vs Run Time Varying warm-up time changes output by over 1% Preflight data taken with 15 to 45 minutes of warm-up Loud alarm needs to signal when to take data

Ames Research Center Airborne Sensor Facility Preflight Humidity sensitivity Port 2 fogs often N2 Purge needed Fore optics occasionally mist over slightly

Ames Research Center Airborne Sensor Facility Hemisphere Temperature Stability, Crystal, Texas 2002, Thorpex These data points were taken at exactly 25 minutes after Hemisphere start

Ames Research Center Airborne Sensor Facility CRYSTAL-Face: Daily Hemisphere Response & Projected Degradation Used in L-1B Calibration (based on 30” sphere)

Ames Research Center Airborne Sensor Facility THORPEX: Daily Hemisphere Response & Projected Degradation Used in L-1B Calibration (based on 30” sphere)

Ames Research Center Airborne Sensor Facility Crystal Sphere vs Hemisphere & Humidity

Ames Research Center Airborne Sensor Facility Texas 2002 Port 1 Preflight Change

Ames Research Center Airborne Sensor Facility Used by Keck Telescope Started in Hawaii ’03 Eliminated degradation Cleaned after every flight CO2 Snow Cleaning