Radiometric characterization of the NASA GSFC radiometric calibration facility primary transfer radiometer

2004 ◽  
Author(s):  
John W. Cooper ◽  
Steven W. Brown ◽  
Peter Abel ◽  
John E. Marketon ◽  
James J. Butler
Keyword(s):  
Radiometric Calibration ◽  
Calibration Facility

scholarly journals Characterization of blackbody inhomogeneity and its effect on the retrieval results of the GLORIA instrument

2018 ◽  
Author(s):  
Anne Kleinert ◽  
Isabell Krisch ◽  
Jörn Ungermann ◽  
Albert Adibekyan ◽  
Berndt Gutschwager ◽  
...  
Keyword(s):  
Water Vapor ◽  
Temperature Distribution ◽  
Vertical Resolution ◽  
Radiometric Calibration ◽  
Climate Trends ◽  
Trace Species ◽  
Calibration Uncertainty

Abstract. Limb sounding instruments play an important role for the monitoring of climate trends, as they provide a good vertical resolution. Traceability to the SI via onboard reference or transfer standards is needed to compare trend estimates from multiple instruments. This study investigates the required uncertainty of these radiation standards to properly resolve decadal trends of climate relevant trace species like ozone, water vapor and temperature distribution for the Gimballed Limb Observer for Radiance Imaging of the Atmosphere (GLORIA). Temperature nonuniformities of the onboard reference blackbodies, used for radiometric calibration, have an impact on the calibration uncertainty. The propagation of these nonuniformities through the retrieval is analyzed. A threshold for the maximum tolerable uncertainty of the blackbody temperature is derived, so that climate trends can be significantly identified with GLORIA.

Use of an Imaging Spectrometer for Characterization of a Cesium Dosimeter Calibration Facility

2020 ◽  
Vol 118 (4) ◽  
pp. 462-469
Author(s):  
Roger J. Champion ◽  
Robert M. Golduber ◽  
Kimberlee J. Kearfott
Keyword(s):  
Imaging Spectrometer ◽  
Calibration Facility

scholarly journals Multispectral Sensor Calibration and Characterization for sUAS Remote Sensing

Sensors ◽  
2019 ◽  
Vol 19 (20) ◽  
pp. 4453 ◽  
Author(s):  
Mamaghani ◽  
Salvaggio
Keyword(s):  
Remote Sensing ◽  
Near Infrared ◽  
Laboratory Method ◽  
Sensor Calibration ◽  
Radiometric Calibration ◽  
End User ◽  
Sensing Applications ◽  
A Value ◽  
Remote Sensing Applications

This paper focuses on the calibration of multispectral sensors typically used for remote sensing. These systems are often provided with "factory" radiometric calibration and vignette correction parameters. These parameters, which are assumed to be accurate when the sensor is new, may change as the camera is utilized in real-world conditions. As a result, regular calibration and characterization of any sensor should be conducted. An end-user laboratory method for computing both the vignette correction and radiometric calibration function is discussed in this paper. As an exemplar, this method for radiance computation is compared to the method provided by MicaSense for their RedEdge series of sensors. The proposed method and the method provided by MicaSense for radiance computation are applied to a variety of images captured in the laboratory using a traceable source. In addition, a complete error propagation is conducted to quantify the error produced when images are converted from digital counts to radiance. The proposed methodology was shown to produce lower errors in radiance imagery. The average percent error in radiance was −10.98%, −0.43%, 3.59%, 32.81% and −17.08% using the MicaSense provided method and their "factory" parameters, while the proposed method produced errors of 3.44%, 2.93%, 2.93%, 3.70% and 0.72% for the blue, green, red, near infrared and red edge bands, respectively. To further quantify the error in terms commonly used in remote sensing applications, the error in radiance was propagated to a reflectance error and additionally used to compute errors in two widely used parameters for assessing vegetation health, NDVI and NDRE. For the NDVI example, the ground reference was computed to be 0.899 ± 0.006, while the provided MicaSense method produced a value of 0.876 ± 0.005 and the proposed method produced a value of 0.897 ± 0.007. For NDRE, the ground reference was 0.455 ± 0.028, MicaSense method produced 0.239 ± 0.026 and the proposed method produced 0.435 ± 0.038.

General methods for the characterization of the nonuniformity of a radiometric calibration source

2019 ◽  
Vol 58 (18) ◽  
pp. 4918
Author(s):  
Kristen M. Vogelhuber ◽  
Karin Fulford ◽  
Radley Serafico ◽  
Dalton Turpen ◽  
Russell Cooper ◽  
...  
Keyword(s):  
Radiometric Calibration ◽  
Calibration Source

Improved ground calibration results from Southwest Research Institute Ultraviolet Radiometric Calibration Facility (UV-RCF)

2014 ◽  
Author(s):  
Michael W. Davis ◽  
Thomas K. Greathouse ◽  
G. Randall Gladstone ◽  
Kurt D. Retherford ◽  
David C. Slater ◽  
...  
Keyword(s):  
Radiometric Calibration ◽  
Southwest Research Institute ◽  
Calibration Facility ◽  
Ground Calibration ◽  
Research Institute

An Uncertainty Analysis of a NIST Hydrocarbon Liquid Flow Calibration Facility

Volume 1 ◽  
2004 ◽  
Author(s):  
T. T. Yeh ◽  
P. I. Espina ◽  
G. E. Mattingly ◽  
N. R. Briggs ◽  
Jesu´s Aguilera
Keyword(s):  
Uncertainty Analysis ◽  
Liquid Flow ◽  
Confidence Level ◽  
Jet Fuels ◽  
Expanded Uncertainty ◽  
Uncertainty Characterization ◽  
Hydrocarbon Liquid ◽  
Calibration Facility ◽  
Calibration Interval

This paper presents the uncertainty characterization of NIST’s new hydrocarbon liquid flow calibrator (HLFC). This facility uses a passive piston prover technique where fluid is driven by pumps while the measuring piston is passively stroked through the calibration interval. This facility is typically operated using MIL-C-7024C fluid (also known as Stoddard solvent – a surrogate liquid for JP-4 and JP-5 jet fuels), but using a variety of other fluids offers a wider range of measurements. The range of flows for this facility is 0.19 to 5.7 liters per minute – lpm (0.05 to 1.5 gallons per minute – gpm). Over this range, the expanded uncertainty claim for this facility is ±0.01%, at 95% confidence level. The uncertainty of a dual-turbine meter tested in the system is also reported. In addition, NIST is working to incorporate additional piston provers so that the flow for hydrocarbon liquids calibration service will reach 760 lpm (200 gpm).

Characterization of a neutron calibration facility at the SCK-CEN

1997 ◽  
Author(s):  
Filip Vanhavere ◽  
Fernand Vermeersch ◽  
P. Cuynen
Keyword(s):  
Calibration Facility
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