Overview Of Blackbody Radiation Sources

1982 ◽  
Author(s):  
Arthur J. Cussen
Keyword(s):  
Blackbody Radiation ◽  
Radiation Sources

scholarly journals The in-flight blackbody calibration system for the GLORIA interferometer on board an airborne research platform

2013 ◽  
Vol 6 (11) ◽  
pp. 3067-3082 ◽  
Author(s):  
F. Olschewski ◽  
A. Ebersoldt ◽  
F. Friedl-Vallon ◽  
B. Gutschwager ◽  
J. Hollandt ◽  
...  
Keyword(s):  
Blackbody Radiation ◽  
National Metrology Institute ◽  
Calibration System ◽  
Large Area ◽  
Thermo Electric ◽  
Infrared Radiance ◽  
Radiation Sources ◽  
Research Aircraft ◽  
And Performance ◽  
Blackbody Calibration

Abstract. The Gimballed Limb Observer for Radiance Imaging of the Atmosphere (GLORIA) is a prototype of an imaging Fourier Transform Spectrometer (FTS) for PREMIER, a former candidate mission for ESA's Earth Explorer 7. GLORIA is deployed on board various research aircraft such as the Russian M55 Geophysica or the German HALO. The instrument provides detailed infrared images of the Upper Troposphere/Lower Stratosphere (UTLS) region, which plays a crucial role in the climate system. GLORIA uses a two-dimensional detector array for infrared limb observations in emission and therefore needs large-area blackbody radiation sources (126 mm × 126 mm) for calibration. In order to meet the highly demanding uncertainty requirements for the scientific objectives of the GLORIA missions and due to the sophisticated tomographic evaluation scheme, the spatial distribution of the radiance temperature of the blackbody calibration sources has to be determined with an uncertainty of about 0.1 K. Since GLORIA is exposed to the hostile environment of the UTLS with mutable low temperature and pressure, an in-flight calibration system has to be carefully designed to cope with those adverse circumstances. The GLORIA in-flight calibration system consists of two identical weight-optimised high-precision blackbody radiation sources, which are independently stabilised at two different temperatures. The two point calibration is in the range of the observed atmospheric infrared radiance emissions with 10 K below and 30 K above ambient temperature, respectively. Thermo-Electric Coolers are used to control the temperature of the blackbody radiation sources offering the advantage of avoiding cryogens and mechanical coolers. The design and performance of the GLORIA in-flight calibration system is presented. The blackbody calibration sources have been comprehensively characterised for their spatially (full aperture) and spectrally (7 to 13 μm) resolved radiation properties in terms of radiance temperatures traceable to the International Temperature Scale (ITS-90) at the Physikalisch-Technische Bundesanstalt (PTB), the national metrology institute of Germany.

scholarly journals The in-flight blackbody calibration system for the GLORIA interferometer on board an airborne research platform

2013 ◽  
Vol 6 (3) ◽  
pp. 5529-5575
Author(s):  
F. Olschewski ◽  
A. Ebersoldt ◽  
F. Friedl-Vallon ◽  
B. Gutschwager ◽  
J. Hollandt ◽  
...  
Keyword(s):  
Blackbody Radiation ◽  
National Metrology Institute ◽  
Calibration System ◽  
Large Area ◽  
Thermo Electric ◽  
Infrared Radiance ◽  
Radiation Sources ◽  
Research Aircraft ◽  
And Performance ◽  
Blackbody Calibration

Abstract. The Gimballed Limb Observer for Radiance Imaging of the Atmosphere (GLORIA) is a prototype of an imaging Fourier Transform Spectrometer (FTS) for PREMIER, a candidate mission for ESA's Earth Explorer 7. GLORIA is deployed on board various research aircraft like the Russian M55 Geophysica or the German HALO. The instrument provides detailed infrared images of the Upper Troposphere/Lower Stratosphere (UTLS) region, which plays a crucial role in the climate system. GLORIA uses a two-dimensional detector array for infrared limb observations in emission and therefore needs large-area blackbody radiation sources (126 mm × 126 mm) for calibration. In order to meet the highly demanding uncertainty requirements for the scientific objectives of the GLORIA missions and due to the sophisticated tomographic evaluation scheme, the spatial distribution of the radiance temperature of the blackbody calibration sources has to be determined with an uncertainty of about 0.1 K. Since GLORIA is exposed to the hostile environment of the UTLS with mutable low temperature and pressure, an in-flight calibration system has to be carefully designed to cope with those adverse circumstances. The GLORIA in-flight calibration system consists of two identical weight-optimised high-precision blackbody radiation sources, which are independently stabilized at two different temperatures. The two point calibration is in the range of the observed atmospheric infrared radiance emissions with 10 K below and 30 K above ambient temperature, respectively. Thermo-Electric Coolers are used to control the temperature of the blackbody radiation sources offering the advantage of avoiding cryogens and mechanical coolers. The design and performance of the GLORIA in-flight calibration system is presented. The blackbody calibration sources have been comprehensively characterized for their spatially (full aperture) and spectrally (7 μm to 13 μm) resolved radiation properties in terms of radiance temperatures traceable to the International Temperature Scale (ITS-90) at the Physikalisch-Technische Bundesanstalt (PTB), the national metrology institute of Germany.

Effects of Periodic Structures on the Coherence Properties of Blackbody Radiation

2004 ◽  
Vol 126 (5) ◽  
pp. 786-792 ◽  
Author(s):  
L. Hu ◽  
A. Schmidt ◽  
A. Narayanaswamy ◽  
G. Chen
Keyword(s):  
Ray Tracing ◽  
Layer Thickness ◽  
Periodic Structures ◽  
Blackbody Radiation ◽  
Radiative Properties ◽  
Multilayer Structures ◽  
Wave Optics ◽  
Wave Interference ◽  
Radiation Sources ◽  
Random Structures

Radiative properties have been studied for one-dimensional dielectric multilayer structures subjected to blackbody radiation sources. The total hemispherical transmittances are calculated for periodic structures and structures with random variation in layer thickness, using wave-optics and ray-tracing methods. Simulation results show that for periodic structures, the transmittance calculated using wave optics approaches a nonzero constant value with an increasing number of layers, while the transmittance obtained using the ray-tracing method asymptotically approaches zero. For random structures, the transmittance given by wave optics drops to zero at different rates depending on the order of random variations in layer thickness. It is found that the wave interference effect always plays a role when dealing with multilayer structures. The results are explained based on extended and localized waves.

scholarly journals Local burst model of CMB temperature fluctuations: luminescence in lines of primary para- and orthohelium

2018 ◽  
Vol 619 ◽  
pp. A29 ◽  
Author(s):  
V. Dubrovich ◽  
S. Grachev ◽  
T. Zalialiutdinov
Keyword(s):  
Quantum Yield ◽  
Background Radiation ◽  
Excited Atom ◽  
Temperature Fluctuations ◽  
Blackbody Radiation ◽  
Angular Distributions ◽  
Spherically Symmetric ◽  
Line Profiles ◽  
Radiation Sources ◽  
Cmb Temperature

We have considered the formation of the luminescent subordinate HeI lines by the absorption of continuum radiation from a source in the lines of the main HeI series in the expanding Universe. It is suggested that at some moment of time, corresponding to the redshift z0, a burst of superequilibrium blackbody radiation with a temperature T + ΔT occurs. This radiation is partially absorbed at different z <  z0 in the lines of the main HeI series and then converted into the radiation of subordinate lines. If νij is the laboratory frequency of the transition of some subordinate line originating at some z, then in the present time its frequency will be ν = νij/(1 + z). For different z (and, consequently, for different ν), the quantum yield for the subordinate lines of para- and orthohelium - the number of photons emitted in the subordinate line, per one initial excited atom and line profiles are calculated. Different pumping channels were considered. Spatial and angular distributions of radiation intensity of luminescent lines for the spherically symmetric radiation sources are presented. It is shown that for sufficiently large ΔT/T, the luminescent lines can be very noticeable in the spectrum of blackbody background radiation.

Blackbody radiation sources for the IR spectral range

2013 ◽  
Author(s):  
S. A. Ogarev ◽  
S. P. Morozova ◽  
A. A. Katysheva ◽  
B. E. Lisiansky ◽  
M. L. Samoylov
Keyword(s):  
Spectral Range ◽  
Blackbody Radiation ◽  
Radiation Sources
Sign in / Sign up

Export Citation Format

Share Document