GIFTS Blackbody Subsystem Critical Design Review Blackbody Requirements Flowdown Fred Best 9 March 2004.

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Presentation transcript:

GIFTS Blackbody Subsystem Critical Design Review Blackbody Requirements Flowdown Fred Best 9 March 2004

Topics GIFTS Calibration Scheme Flowdown of requirements Blackbody Error Contributions to GIFTS Calibration Overview of Top Level BB Subsystem Specifications

GIFTS Radiometric Calibration Concept Two small reference Blackbodies located behind telescope, combined with Space View. Blackbody design is scaled from the UW ground-based AERI and NAST / S-HIS aircraft instruments. Constraints on original S/C prevented traditional external large aperture blackbody configuration. Advantages compared to large external blackbody: (1) higher emissivity is practical with small size (2) protection from solar forcing.

GIFTS Electro-optical Diagram

Aperture stop image at blackbody aperture GIFTS Sensor Module BENCH FORE OPTICS BAFFLE A-FOCAL BAFFLE AFT OPTICS BAFFLE FORE OPTICS SECONDARY BAFFLE PMA BAFFLE BLACKBODIES Blackbodies Aperture stop image at blackbody aperture

GIFTS Blackbody Absolute Calibration Budget

GIFTS Blackbody Reproducibility Calibration Budget

GIFTS Blackbody Error Sources-LW Longwave Band (800 cm-1) Absolute TA=255, TH=290, Ts=240, Tt=280, Tm=250 0.1 K 0.1 K 0.001 0.001 5 K

GIFTS Blackbody Error Sources-LW Longwave Band (800 cm-1) Reproducibility TA=255, TH=290, Ts=240, Tt=280, Tm=250 0.014 K 0.014 K 0.0 0.0 5 K

GIFTS Blackbody Error Sources-SW Shortwave Band (1800 cm-1) Absolute TA=255, TH=290, Ts=240, Tt=280, Tm=250 0.1 K 0.1 K 0.001 0.001 5 K

GIFTS Blackbody Error Sources-SW Shortwave Band (1800 cm-1) Reproducibility TA=255, TH=290, Ts=240, Tt=280, Tm=250 0.014 K 0.014 K 0.0 0.0 5 K

Summary of Top Level BB Requirements Current Best Estimate Specification* Ambient Blackbody Nominal Set Point 255 K Hot Blackbody Nominal Set Point 290 K Temperature Measurement Uncertainty < 0.1 K (3 sigma) < 0.074 K (3 sigma) Ambient Blackbody Emissivity > 0.996 > 0.998 Hot Blackbody Emissivity Emissivity Uncertainty < 0.002 < 0.00072 (3 sigma) Wavelength 680 - 2,300 cm-1 *Derived From GIRD Using Radiometric Model

Summary of Top Level BB Requirements Current Best Estimate Specification* Source Aperture 2.54 cm Source FOV (full angle) > 10° Mass (two blackbodies plus controller board) < 2.4 kg < 2.1 kg Power: average/max < 2.2/5.2 W Envelope < 8 x 8 x 15.5 cm < 8 x 8 x 15.4 cm *Imposed by GIFTS Sensor Module Design