The Geosynchronous Imaging Fourier Transform Spectrometer (GIFTS) on-board blackbody calibration system

Best, Fred A.; Revercomb, Henry E.; Knuteson, Robert O.; Tobin, David C.; Ellington, Scott D.; Werner, Mark W.; Adler, Douglas P.; Garcia, Raymond K.; Taylor, Joe K.; Ciganovich, Nick N.; Smith, William L.; Bingham, Gail E.; Elwell, John; Scott, Deron

doi:10.1117/12.579017

Cited by 16 publications

(9 citation statements)

References 14 publications

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“…The IR radiation in these two bands is then focused on the LWIR and SMWIR focal plane arrays (FPAs). A flip-in mirror can be inserted into the optical path between M2 and M3 to allow the FPAs to view one of two internal blackbodies designed by the University of Wisconsin-Madison Space Science and Engineering Center 3,4 . A cold shutter at 60 K can be moved into the optical path in front of the Lyot stop to block all incoming radiation to make measurements of the detector dark offset levels.…”

Section: Introductionmentioning

confidence: 99%

Modeled vs. actual performance of the Geosynchronous Imaging Fourier Transform Spectrometer (GIFTS)

et al. 2006

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The NASA Geosynchronous Imaging Fourier Transform Spectrometer (GIFTS) has been completed as an Engineering Demonstration Unit (EDU) and has recently finished thermal vacuum testing and calibration. The GIFTS EDU was designed to demonstrate new and emerging sensor and data processing technologies with the goal of making revolutionary improvements in meteorological observational capability and forecasting accuracy. The GIFTS EDU includes a cooled (150 K), imaging FTS designed to provide the radiometric accuracy and atmospheric sounding precision required to meet the next generation GOES sounder requirements. This paper discusses a GIFTS sensor response model and its validation during thermal vacuum testing and calibration.The GIFTS sensor response model presented here is a component-based simulation written in IDL with the model component characteristics updated as actual hardware has become available. We discuss our calibration approach, calibration hardware used, and preliminary system performance, including NESR, spectral radiance responsivity, and instrument line shape. A comparison of the model predictions and hardware performance provides useful insight into the fidelity of the design approach.

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Section: Introductionmentioning

confidence: 99%

Modeled vs. actual performance of the Geosynchronous Imaging Fourier Transform Spectrometer (GIFTS)

et al. 2006

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“…The blackbody calibration contribution budget allocation is < 0.5K and the engineering best estimates are <0.35K (LW) and <0.20K (SMW). The uncertainty estimates of the UW-SSEC blackbodies are described in much greater detail in 9 . The uncertainty estimates in the calibrated radiance are obtained through a perturbation analysis of Eq.…”

Section: Gifts Radiometric Calibrationmentioning

confidence: 99%

“…The main advantage of this approach is that the IR beam is much smaller after the telescope so that a true high emissivity cavity design can be used for the blackbodies while keeping the volume, weight, and power requirements to a minimum. The successful design of these blackbodies for the GIFTS sensor is described in 9 . The high absolute accuracy of the onboard reference blackbodies compensates for the additional uncertainty from degradation of the telescope optics over time.…”

Section: Introductionmentioning

confidence: 99%

On-orbit calibration of the Geosynchronous Imaging Fourier Transform Spectrometer (GIFTS)

Knuteson

Best

Bingham

et al. 2005

Multispectral and Hyperspectral Remote Sensing Instruments and Applications II

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The Geosynchronous Imaging Fourier Transform Spectrometer (GIFTS) sensor has been designed to provide highly accurate radiometric and spectral radiances in order to meet the requirements of remote sensing of atmospheric motion from a geostationary orbit. The GIFTS sensor was developed under NASA New Millenium Program funding to demonstrate the tracking of infrared water vapor features in the atmosphere with high vertical resolution. A calibration concept has been developed for the GIFTS instrument design which meets the top level requirement to measure brightness temperature to better than 1 K. The in-flight radiometric calibration is performed using views of two on-board blackbody sources along with cold space. For the GIFTS design, the spectral calibration is established by the highly stable diode laser used as the reference for interferogram sampling, and verified with comparisons to atmospheric absorption line positions. The status of the GIFTS on-orbit calibration approach is described and accuracy estimates are provided. GIFTS is a collaborative activity among

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“…The main purpose of the blackbody design is to provide an isothermal cavity with a very accurate emissivity 3 . Table 1 presents the specification and requirements for the blackbody.…”

Section: Requirements For the Blackbody And Emissivity Monitormentioning

confidence: 99%

Characterization of a quantum cascade laser-based emissivity monitor for CORSAIR

Lwin

Wojcik²,

Latvakoski³

et al. 2011

SPIE Proceedings

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Continuous improvements of quantum cascade laser (QCL) technology have extended the applications in environmental trace gas monitoring, mid-infrared spectroscopy in medicine and life science, law enforcement and homeland security and satellite sensor systems. We present the QCL based emissivity monitor for the CORSAIR blackbody. The emissivity of the blackbody was designed to be better than 0.9999 for the spectral range between 5 to 50µm. To actively monitor changes in blackbody emissivity we employ a QCL-based infrared illumination source. The illumination source consisted of a QCL and thermoelectric cooler (TEC) unit mounted on a copper fixture. The stability of the QCL was measured for 30, 60, and 90s operation time at 1.5A driving current. The temperature distribution along the laser mounting fixture and time dependent system heat dispersion were analyzed. The results were compared to radiative and conductive heat transfer models to define the potential laser operating time and required waiting time to return to initial temperature of the laser mount. The observed cooling behaviour is consistent with a primarily conductive heat transfer mechanism.

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The Geosynchronous Imaging Fourier Transform Spectrometer (GIFTS) on-board blackbody calibration system

Cited by 16 publications

References 14 publications

Modeled vs. actual performance of the Geosynchronous Imaging Fourier Transform Spectrometer (GIFTS)

Modeled vs. actual performance of the Geosynchronous Imaging Fourier Transform Spectrometer (GIFTS)

On-orbit calibration of the Geosynchronous Imaging Fourier Transform Spectrometer (GIFTS)

Characterization of a quantum cascade laser-based emissivity monitor for CORSAIR

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