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

A new facility for the synchrotron radiation-based calibration of transfer radiation sources in the ultraviolet and vacuum ultraviolet spectral range

2015 ◽  
Vol 86 (1) ◽  
pp. 013106 ◽  
Author(s):  
Reiner Thornagel ◽  
Rolf Fliegauf ◽  
Roman Klein ◽  
Simone Kroth ◽  
Wolfgang Paustian ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Spectral Range ◽  
Vacuum Ultraviolet ◽  
Radiation Sources ◽  
New Facility

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.

Laser-assisted photochemical wastewater treatment

1997 ◽  
Vol 35 (4) ◽  
pp. 181-188 ◽  
Author(s):  
Angela Unkroth ◽  
Volker Wagner ◽  
Roland Sauerbrey
Keyword(s):  
Spectral Range ◽  
Lower Amount ◽  
Reaction Products ◽  
Decomposition Reactions ◽  
Radiation Sources ◽  
Wavelength Radiation ◽  
Photolytic Decomposition ◽  
193 Nm ◽  
Uv Emitters ◽  
Good Agreement

Existing UV-emitters on the basis of mercury arc lamps have a quantum yield which is too low in the spectral range 1 < 250 nm to be of interest for most photolytic decomposition reactions. At present the only radiation sources available in that spectral range are excimer lasers or excimer lamps. Here we present a method based on an excimer laser. Its intense pulsed radiation could be a powerful alternative to common mercury lamps. As model substances dyes for colouring textiles and wastewaters of dyehouses containing also auxiliary materials were used. The waters were treated with laser radiation of different wavelengths (193 nm - ArF, 248 nm - KrF) frequently under addition of hydrogen peroxide or ozone as oxidizers. It was found that with the 193 nm radiation at the same energy dose and a substantially lower amount of added oxidizers the decolourization effect was greater than at 248 nm. The reduction of TOC was also faster. The HPLC spectra of the reaction products at the two laser wavelengths showed good agreement, so that the advantage of the shorter-wavelength radiation is the simplier achievement of the activation energies necessary for oxidation or decomposition reactions.

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.

Sign in / Sign up

Export Citation Format

Share Document