Shanghai Institute of Technical Physics , Chinese Academy of Science Lunar observation plan based on SI-traceable demonstration instrument development Feng Jiang Shanghai Institute of Technical Physics , Chinese Academy of Science 2017 Joint GSICS/IVOS Lunar Calibration Workshop

2017 Joint GSICS/IVOS Lunar Calibration Workshop 1.Lunar observation plan introduction 2.Sensor calibration overview 3.Error budget analysis 4.On orbit calibration

Orbit parameters Moon Sun Spectrometer Altitude ~ 410Km Inclination 50° Orbit period 92.7 minutes Ground speed 7.23Km/s Spectrometer

+X +Y +Z

XOY plane -90° -60° -30° 0° 30° 60° 90°

Cryogenic Absolute Radiometer Spectral range: 0.25~50μm Absolute accuracy: <0.02% Power resolution: 0.01nW Key Laboratory of Optics Calibration and Characterization， Chinese Academy of Science

Trap Detector

Spectral reponsivity

spatial non-uniformity instability polarization sensitivity repeatability linearity laser power measurement

Absolue spectral response uncertainty of standard detector @632.8nm

Standard radiometer

Standard radiometer

Standard radiometer

Spectrometer calibration uncertainty -Uncertainty of the standard radiometer -Stability and spatial uniformity of the light source -Wavelength calibration -Polarization sensitivity -Stray light -Detector linearity -Point spread function and line spread function -Thermal

Pre-flight calibration Integrating Sphere Spectrometer Tunable Laser Standard radiometer

Polarization sensitivity zigzag blazed grating

Birefringence index difference Depolarizer Clear Aperture 40mm Wedge angle 12＇±2＇ Center thickness t1 /mm 3.5±0.01 Center thickness t2 /mm 3.53±0.01 Material quartz crystal Birefringence index difference 0.009

Cryogenic Absolute radiometer Spectrometer (VIS~NIR) Error Budget Cryogenic Absolute radiometer Uncertainty ~0.02% Si trap detector Uncertainty ~0.15% Spectrometer (VIS~NIR) Uncertainty ~1.24% Standard Radiometer Uncertainty ~0.5% 激光均匀光源 稳定性 （Laser illuminated integrating sphere source）

On orbit calibration

On orbit calibration

On orbit calibration On orbit attenuator Ground (Neutral density filter)

Thank you !