&lt;title&gt;Radiometric calibration plan for the Clouds and the Earth's Radiant Energy System scanning instruments&lt;/title&gt;

Jarecke, Peter J.; Folkman, Mark A.; Darnton, Lane A.

doi:10.1117/12.46702

Cited by 10 publications

(7 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is estimated that a 15 % underfilling ofthe CERES aperture will occur at 200 pm, but the effect cancels because the aperture stop ofthe reference detector optics is identical in size and location to the CERES sensor aperture stop. 5) In the far infrared, the FTS source intensity is about five times greater than the self-emission of the reference detector at room temperature and the CERES detectors at 3 10 K. If the FTS source energy were eliminated, an interferogram would still be produced by the detector emission because it is originating at a relayed image of the FTS field stop. This interferogram would be self-observed by the detectors under test.…”

Section: Measurement Planmentioning

confidence: 98%

<title>Far-IR spectral response measurements of the Clouds and the Earth's Radiant Energy System (CERES) sensors using a Fourier transform spectrometer and pyroelectric reference detector</title>

Frink¹,

Jarecke²,

Folkman³

et al. 1993

SPIE Proceedings

Self Cite

View full text Add to dashboard Cite

The Clouds and the Earth's Radiant Energy System (CERES) program continues the long term monitoring ofthe Earth's radiant energy budget begun by the Earth Radiation Budget Experiment (ERBE) scanning radiometer instruments. The CERES instrument contains three thermal detector based radiometers with broadband spectral responses. The relative spectral responses must be characterized at far infrared wavelengths out to 200 pm in support of absolute radiometnc calibration. This will be accomplished with a Fourier transform spectrometer as a spectral source, relay optics and a vacuum chamber containing the sensors. This facility currently under development for the CERES program will measure end4o-end sensor spectral response relative to a spectrally flat well characterized reference detector also located in the vacuum chamber. Facility design and controls on the measurement process to assure spectral accuracy are discussed.

show abstract

Section: Measurement Planmentioning

confidence: 98%

<title>Far-IR spectral response measurements of the Clouds and the Earth's Radiant Energy System (CERES) sensors using a Fourier transform spectrometer and pyroelectric reference detector</title>

Frink¹,

Jarecke²,

Folkman³

et al. 1993

SPIE Proceedings

Self Cite

View full text Add to dashboard Cite

show abstract

“…The sensor gains in the longwave and shortwave spectral regions are derived using the test data from various sources in the RCF 7,8 . A Fourier Transform Spectrometer (FTS) system is used for the spectral characterization of the sensors in the wavelength region beyond 3.0 micron 9 .…”

Section: Ground Calibrationsmentioning

confidence: 99%

Pre-launch sensor characterization of the CERES Flight Model 5 (FM5) instrument on NPP mission

et al. 2011

View full text Add to dashboard Cite

Clouds and the Earth's Radiant Energy System (CERES) instrument was designed to measure broadband radiances in reflected shortwave and emitted outgoing longwave energy. The 3-sensor CERES instrument measure radiances in 0.3 to 5.0 micron region with Shortwave sensor, 0.3 to >100 microns with Total sensor and 8 to 12 micron region with Window sensor. Flight Model 5 (FM5), the sixth of the CERES instruments is scheduled to launch aboard the NPP spacecraft on October 2011. An accurate determination of the radiometric gains and spectral responsivity of CERES FM5 sensors was accomplished through rigorous calibrations at Northrop Grumman Aerospace Systems' (NGAS) Radiometric Calibration Facility (RCF). The longwave calibration of the total and window sensors are achieved using the Narrow Field-of-View Blackbody (NFBB) source which is tied to International Scale of 1990 (ITS '90). A Shortwave Reference Source (SWRS) along with the Transfer Active Cavity radiometer (TACR) which acts as the transfer standard of NFBB source, is used to determine the radiometric responsivity and spectral response estimates of the SW sensor and shortwave portion of the Total sensor. The spectral responsivity in longwave region is determined using a Fourier Transform Spectrometer (FTS) system. CERES instrument also perform calibrations using on-board sources during pre-launch testing which serve as a traceability standard to carry the ground determined sensor radiometric gains to orbit. This paper covers the calibration philosophy and the results from ground calibration testing of FM5 sensors conducted in 2008. The sensor radiometric gain responses calculated using primary sources and performance of the sensors using on-board sources will be discussed.

show abstract

“…During January [13][14][15][16][17][18][19][20][21][22]1998, the calibrations were conducted typically every two days. During January 4 -1 1, 1998, using the MAM, sensor solar calibrations were conducted daily.…”

Section: -Trmmjceres Sensor and Measurement Statusmentioning

confidence: 99%

<title>Ground through on-orbit transfer of the International Temperature Scale of 1990 (ITS-90): radiometeric scale using the CERES thermistor bolometers and built-in flight calibration systems</title>

et al. 1999

View full text Add to dashboard Cite

The Clouds and Earth's Radiant Energy System (CERES thermistor bolometers were calibrated using filtered radiances, characterized on an International Temperature Scale of 1990 (ITS-90) derived absolute radiometric scale. Longwave filtered radiances were characterized using the optical and geometric surface properties of the reference Narrow-Field-of-View Blackbody (NFBB), the NFBB temperature measurements from the ITS-90 calibrated platinum resistance thermometers (PRT) embedded in the blackbodies, and the spectral responses of the CERES bolometers. Shortwave filtered radiances were characterized using the cryogenically-cooled Transfer Active Cavity Radiometer (TACR) which was an ITS-90 transfer standard, and using the spectral responses of the bolometers. In ground vacuum facilities, the ITS-90, temperature-based radiometric scale was transferred to the CERES bolometers. As ITS-90 transfer standards, the bolometers were used to characterize the emitted filtered radiances from in-flight systems: (1) the internal calibration module (1CM) which consisted of anodized aluminum blackbodies and tungsten lamp sources; and (2) mirror attenuator mosaic (MAM) which was an aluminum solar diffuser plate, built into the bolometer instrumentation. From the ground [October 1995] through the on-orbit phases [December 1998 -July 1999] of the Tropical Rainfall Measuring Mission (TRMM) Spacecraft CERES instrument mission, the stabilities of the bolometers' responses were assessed from periodical observations of the in-flight calibration systems radiances. Each CERES instrument package consisted of broadband shortwave [0.3 jim to 5.0 .tm], broadband total [0.3 pm to >100 .tm], and narrowband window [8 pm and 12 rim], scanning thermistor bolometer sensor units; and of inflight calibration systems.Between the ground and initial on-orbit calibrations, the TRMM CERES bolometers and the builtin, flight calibration system sources maintained their filtered radiance measurement ties to ITS-90 at the 0.2 Wm2sr' precision level. On-orbit calibration studies indicate that the radiance measurements were stable at the 0.2 Wm2sr' precision level. The ground and on-orbit calibration results are presented and discussed.

show abstract

<title>Radiometric calibration plan for the Clouds and the Earth's Radiant Energy System scanning instruments</title>

Cited by 10 publications

References 0 publications

<title>Far-IR spectral response measurements of the Clouds and the Earth's Radiant Energy System (CERES) sensors using a Fourier transform spectrometer and pyroelectric reference detector</title>

<title>Far-IR spectral response measurements of the Clouds and the Earth's Radiant Energy System (CERES) sensors using a Fourier transform spectrometer and pyroelectric reference detector</title>

Pre-launch sensor characterization of the CERES Flight Model 5 (FM5) instrument on NPP mission

<title>Ground through on-orbit transfer of the International Temperature Scale of 1990 (ITS-90): radiometeric scale using the CERES thermistor bolometers and built-in flight calibration systems</title>

Contact Info

Product

Resources

About