A Calibration Source for FIR-Astronomy Experiments

1979 ◽  
Author(s):  
R. Hofmann
Keyword(s):  
Calibration Source ◽  
Fir Astronomy

Calibration Source for Electron Cyclotron Emission Measurements

1990 ◽  
Vol 29 (Part 1, No. 9) ◽  
pp. 1824-1828 ◽  
Author(s):  
Kazuo Kawahata ◽  
Mizuki Sakamoto ◽  
Junji Fujita ◽  
Hiroshi Matsuo ◽  
Kiyomi Sakai
Keyword(s):  
Electron Cyclotron ◽  
Electron Cyclotron Emission ◽  
Calibration Source ◽  
Cyclotron Emission

Acoustic calibration source for photoacoustic detection cells

1985 ◽  
Vol 57 (8) ◽  
pp. 1786-1788
Author(s):  
Edward P. C. Lai ◽  
Becky L. Chan
Keyword(s):  
Calibration Source ◽  
Photoacoustic Detection ◽  
Acoustic Calibration

scholarly journals A large-area blackbody for in-flight calibration of an infrared interferometer deployed on board a long-duration balloon for stratospheric research

2018 ◽  
Vol 11 (8) ◽  
pp. 4757-4762 ◽  
Author(s):  
Friedhelm Olschewski ◽  
Christian Monte ◽  
Albert Adibekyan ◽  
Max Reiniger ◽  
Berndt Gutschwager ◽  
...  
Keyword(s):  
Temperature Scale ◽  
Environmental Research ◽  
Large Area ◽  
Atmospheric Measurements ◽  
Calibration Source ◽  
Aperture Diameter ◽  
International Temperature Scale ◽  
International Temperature ◽  
Long Duration ◽  
Better Than

Abstract. The deployment of the imaging Fourier Transform Spectrometer GLORIA (Gimballed Limb Observer for Radiance Imaging of the Atmosphere) on board a long-duration balloon for stratospheric research requires a blackbody for in-flight calibration in order to provide traceability to the International Temperature Scale (ITS-90) to ensure comparability with the results of other experiments and over time. GLORIA, which has been deployed onboard various research aircraft such as the Russian M55 Geophysica or the German HALO in the past, shall also be used for detailed atmospheric measurements in the stratosphere up to 40 km altitude. The instrument uses a two-dimensional detector array and an imaging optics with a large aperture diameter of 36 mm and an opening angle of 4.07∘ × 4.07∘ for infrared limb observations. To overfill the field of view (FOV) of the instrument, a large-area blackbody radiation sources (125 mm × 125 mm) is required for in-flight calibration. In order to meet the requirements regarding the scientific goals of the GLORIA missions, the radiance temperature of the blackbody calibration source has to be determined to better than 100 mK and the spatial temperature uniformity shall be better than 150 mK. As electrical resources on board a stratospheric balloon are very limited, the latent heat of the phase change of a eutectic material is utilized for temperature stabilization of the calibration source, such that the blackbody has a constant temperature of about −32 ∘C corresponding to a typical temperature observed in the stratosphere. The Institute for Atmospheric and Environmental Research at the University of Wuppertal designed and manufactured a prototype of the large-area blackbody for in-flight calibration of an infrared interferometer deployed on board a long-duration balloon for stratospheric research. This newly developed calibration source was tested under lab conditions as well as in a climatic and environmental test chamber in order to verify its performance especially under flight conditions. At the PTB (Physikalisch-Technische Bundesanstalt), the German national metrology institute, the spatial radiance distribution of the blackbody was determined and traceability to the International Temperature Scale (ITS-90) has been assured. In this paper the design and performance of the balloon-borne blackbody (BBB) is presented.

scholarly journals Development Of A Calibration Source For Measurement Of Gaseous Oxidized Mercury In Ambient Air

2021 ◽  
Author(s):  
Matthew Davis
Keyword(s):  
Steady State ◽  
Flow Rate ◽  
Stannous Chloride ◽  
Ambient Air ◽  
Calibration Source ◽  
Diffusion Source ◽  
Response To Temperature ◽  
Relevant Level ◽  
Consistent Response ◽  
Gaseous Oxidized Mercury

A HgCl₂ containing diffusion source was evaluated for its potential usefulness as a calibration source for gaseous oxidized mercury (GOM) measurements. Unlike previous calibration sources described in the literature, this source made use of a flow rate of at least 1 L min-¹, and was maintained at a temperature of as low as - 15oC. Under these conditions, the source was found to emit GOM at an environmentally relevant level of 0.0905 pg s-¹, with a GOM fraction of approximately 78%. The source was found to have a consistent response to temperature, a steady state emission level of Hg could be rapidly established and the source was temporally stable. Duplicate sources were compared with one another and found to emit similar levels of Hg under identical sampling conditions. Various methods of cleaning HgCl₂ contaminated items were tested, with the most successful method using a stannous chloride wash solution.

scholarly journals Compact calibration source for thermal infrared Fourier-transform spectrometer

2019 ◽  
Author(s):  
Alexey Shakun ◽  
Fedor Martynovich ◽  
Nikolay Ignatiev ◽  
Alessandro Maturilli ◽  
Aleksandr Santos-Skripko ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Thermal Infrared ◽  
Fourier Transform Spectrometer ◽  
Calibration Source

scholarly journals Calibration source for OH radical based on synchronous photolysis

2020 ◽  
Vol 69 (9) ◽  
pp. 090701
Author(s):  
Feng-Yang Wang ◽  
Ren-Zhi Hu ◽  
Pin-Hua Xie ◽  
Yi-Hui Wang ◽  
Hao Chen ◽  
...  
Keyword(s):  
Oh Radical ◽  
Calibration Source
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