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National Aeronautics and Space Administration Goddard Space Flight Center. Reflected Solar Calibration Demonstration System Update. J. McCorkel K . Thome D. Jennings B . McAndrew J. Hair D . Rabin A. Daw. Calibration Demonstration System. - PowerPoint PPT Presentation
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Reflected Solar Calibration Demonstration System Update
J. McCorkelK. ThomeD. JenningsB. McAndrewJ. HairD. RabinA. Daw
National Aeronautics and Space AdministrationGoddard Space Flight Center
CLARREO SDT Meeting 2
Calibration Demonstration System
• SOlar, Lunar for Absolute Reflectance Imaging Spectrometer (SOLARIS)– Technology demonstration of
• Design and production of optics• Depolarizer technology
– Test prelaunch calibration methods– Evaluate reflectance retrieval– Demonstrate transfer-to-orbit error budget showing
SI-traceability
16-18 Apr 2013
CLARREO SDT Meeting 3
Status at last SDT (Oct 2012)
• Finalized ‘Blue’ box with improved grating, cooled and stabilized detector, and order-sorting filter
• Signal linearization developed for detector package• Silicon trap radiometers obtained for SIRCUS facility
at GSFC• Improved laser stability allowed for SOLARIS
calibration from 560-979 nm scan at 1-nm steps• Goddard IRAD funds provided to calibrate an airborne
imaging spectroradiometer using SOLARIS facilities• 3% absolute uncertainty in NIR portion of spectrum
16-18 Apr 2013
CLARREO SDT Meeting 4
CDS build status
• Improved blue box– Optics and assembly finished– Cooled silicon detector– Awaiting final data acquisition software
development• Red box
– Optics and assembly finished– MCT detector installed
• “Suitcase” SOLARIS– Highly portable version of SOLARIS– COTS high resolution detector package– Completed assembly and initial
calibration– Recently deployed for field collections
16-18 Apr 2013
CLARREO SDT Meeting 5
Calibration• SOLARIS is used to demonstrate CLARREO calibration approaches• Laser-based, “monochromatic” source is basis for CLARREO
laboratory calibration
16-18 Apr 2013
CLARREO SDT Meeting 6
SIRCUS instrumentation
16-18 Apr 2013
Ti:Sapphire 700-1000 nm
350-500 nm
Parametric oscillator
1100-1600 nm
Idler 1750-3300 nm
550-800 nm
240-330 nm
Fancy light bulb: SIRCUS
Transfer radiometers
• Key to SIRCUS is use of highly-accurate monitoring radiometers
• 4 Silicon trap detectors have been calibrated at NIST
• 5 InGaAs detectors and 5 sphere (Si, IGA, extended IGA detectors) undergoing stability monitoring
Spectral irradiance and radiance responsivity calibrations using uniform sources (SIRCUS)
CLARREO SDT Meeting 7
SIRCUS setup
16-18 Apr 2013
CLARREO SDT Meeting 8
G-LiHT
• Goddard's Lidar Hyperspectral and Thermal airborne imager (www.gliht.gsfc.nasa.gov)– Scanning LiDAR– Broadband thermal camera– Downwelling VNIR irradiance spectrometer– Upwelling VNIR imaging spectrometer
• Calibrating G-LiHT’s imaging spectrometer with the SOLARIS/CLARREO facility gives further experience with the SIRCUS set up– Allowed development of calibration approaches coincident with
SOLARIS hardware work– Evaluate sensor effects on calibration– Develop techniques to evaluate sphere source uniformity– Transfer of calibration to operational conditions
16-18 Apr 2013
CLARREO SDT Meeting 9
Recent G-LiHT measurements
Recent G-LiHT measurements• SIRCUS 417-~450 nm, 550-~1015nm in 1-nm interval
– This is our largest and most complete SIRCUS dataset yet– All G-LiHT measurements were coincident with Silicon trap radiometer and
ASD Handheld2 measurements• Transfer characterization of nadir pixels to off-nadir w/ white light
sphere measurements– G-LiHT has an extremely large field-of-view of 50° – ‘Nadir’ G-LiHT spatial pixels correspond to signal of silicon trap radiometer– Off-nadir pixels view area of sphere that is not monitored– Rotate G-LiHT to calibrate all detectors viewing the monitored portion of
the sphere• Impact of rotation on sphere output• Temporal stability of sphere
16-18 Apr 2013
CLARREO SDT Meeting 10
Sphere study with G-LiHT
The baffle/aperture with 4x4’’ port limits the impact of the sensor under test on sphere output
With and without baffle-aperture
G-LiHT needed to be mounted such that its spatial direction could scan a point on the back wall of the integrating sphere.
G-LiHT rotated in 2° increments so that each part of the focal plane sampled a similar area in the sphere.
16-18 Apr 2013
CLARREO SDT Meeting 11
SuitcaseSOLARIS mobile setup
Larger size and lateral offset of COTS focal plane captures Zero order of diffraction grating for further study of stray light
Highpass filter allows us to study a single order with the COTS detector without higher cost of an on-detector order sorting filter
Initial outdoor testing of SuitcaseSOLARIS field-portable system enabled by a compact COTS detector.
16-18 Apr 2013
CLARREO SDT Meeting 12
G-LiHT and SOLARIS
• The G-LiHT and SuitcaseSOLARIS work allowed for a unique opportunity after the launch of LDCM (Landsat 8)– Use the SIRCUS-based calibrated sensors as part of planned
cal/val activities for LDCM OLI– Evaluate intercalibration approaches
• Activities centered around March 29-31– LDCM was being inserted into its final orbit– Passed “under” Landsat 7 allowing cross-comparisons
between sensors on two platforms– SOLARIS team collected data at two test sites in desert
southwest16-18 Apr 2013
CLARREO SDT Meeting 13
Test site and team photos
16-18 Apr 2013
Joel and Don (693)
Kurt and Jason
Joel (618), Jason (505), Jeff (U. Arizona), Kurt (618)
NASA Earth Observatory Image of the Day 4/16/2013
http://earthobservatory.nasa.gov/IOTD/view.php?id=80913
G-LiHT (B. Cook)
SOLARIS
CLARREO SDT Meeting 1516-18 Apr 2013
March 31, 2013Measurement summary
CLARREO SDT Meeting 16
CDS integration, test, and cal flow
16-18 Apr 2013
Performance Test with SIRCUS
Begin I&T(Blue Band)
Sun and Moon Meas.
Reflectance Test with
Diffuser and ASD
Assemble Telescope Sub Assy
Assemble OffnerSub Assy
Assemble Optics Package
Assemble Detector to Detector Housing
Assemble Detector Package (no detector)
Detector Housing
Therm/VacTest
Assemble Complete Instrument
Performance Test with SIRCUS
Begin I&T(Red Band)
Sun and Moon Meas.
Reflectance Test with Diffuser and ASD
Assemble Telescope Sub Assy
Assemble OffnerSub Assy
Assemble Optics Package
Assemble Detector Package
Assemble Complete Instrument
Detector Cal with SIRCUS
Detector Cal with SIRCUS
Calibration with SIRCUS
Calibration with Broadband
Lamps in Sphere
Calibration Round Robin
with Butler and LASP
Calibration with HIP at NIST
Field Measurements
Sun and Moon Measurements
Complete Instrument Model
Component Characterizations
Calibration Accuracy: 1% Calibration Accuracy: 0.3%
Calibration Accuracy: 3%
Build Instrument Control System
Build Instrument Purge/VacSystem
Complete Instrument Control System Software
Current status
FY 2014
CLARREO SDT Meeting 17
Summary
• Work in FY2013 concentrated on taking SOLARIS to the 1% plateau– Transfer radiometer calibration at NIST– Refining laboratory calibration methods– Finalizing SOLARIS hardware
• Remaining work in FY2013 will – Demonstrate error budget for reflectance retrieval– Subject error budget to NIST review– Produce a peer-reviewed SI-traceability for CLARREO-like
measurements– Evaluation of absolute solar irradiance calibration– Lunar model verification from ground-based collects
16-18 Apr 2013
CLARREO SDT Meeting 18
Summary
• SOLARIS CDS will play key role demonstrating CLARREO-quality error budgets– Collaborative efforts with NIST will continue to be critical
• ‘Operational’ use of SIRCUS• Extension to wavelengths > 1 micrometer• Broadband calibration approaches (HIP)
– Calibration approaches will be demonstrated• Laboratory calibration protocols• Error budget demonstration
– Reflectance retrieval• Stray light characterization• Instrument model assessment
16-18 Apr 2013
