scholarly journals A High-Sensitivity Fourier Transform Spectrometer for Cosmic Microwave Background Observations

2020 ◽  
Vol 69 (7) ◽  
pp. 4516-4523 ◽  
Author(s):  
Javier De Miguel-Hernandez ◽  
Roger J. Hoyland ◽  
Maria F. Gomez Renasco ◽  
Jose Alberto Rubino-Martin ◽  
Teodora A. Viera-Curbelo
Keyword(s):  
Fourier Transform ◽  
Cosmic Microwave Background ◽  
High Sensitivity ◽  
Fourier Transform Spectrometer ◽  
Microwave Background

The TopHat Cosmic Microwave Background Anisotropy Experiment

2005 ◽  
Vol 201 ◽  
pp. 65-70
Author(s):  
Robert F. Silverberg ◽  
Keyword(s):  
Cosmic Microwave Background ◽  
Large Scale ◽  
Background Radiation ◽  
High Sensitivity ◽  
Microwave Background ◽  
Long Duration ◽  
Cosmic Microwave Background Anisotropy ◽  
Microwave Background Radiation ◽  
The Universe ◽  
Large Scale Structure Formation

We have developed a balloon-borne experiment to measure the Cosmic Microwave Background Radiation anisotropy on angular scales from ˜50° down to ˜20′. The instrument observes at frequencies between 150 and 690 GHz and will be flown on an Antarctic circumpolar long duration flight. To greatly improve the experiment performance, the front-end of the experiment is mounted on the top of the balloon. With high sensitivity, broad sky coverage, and well-characterized systematic errors, the results of this experiment can be used to strongly constrain cosmological models and probe the early stages of large-scale structure formation in the Universe.

Is the Moon the future of infrared astronomy?

2020 ◽  
Vol 379 (2188) ◽  
pp. 20200212 ◽  
Author(s):  
Jean-Pierre Maillard
Keyword(s):  
Spectral Analysis ◽  
Fourier Transform ◽  
Low Temperature ◽  
Infrared Astronomy ◽  
Fourier Transform Spectrometer ◽  
The Moon ◽  
Large Telescope ◽  
Microwave Background ◽  
Low Gravity ◽  
Fundamental Goal

Infrared astronomy, particularly in spectroscopy, could benefit in a decisive way from an implementation of telescopes on the Moon since the largest telescopes on Earth are practically limited to 40 m and in space to 10 m. On the Moon, a collector larger than on Earth becomes conceivable, thanks to the low gravity and the absence of wind, in having the advantages of space. Passively cooled in the bottom of a permanently shadowed crater at the northern or the southern pole, it could reach unprecedented spectral sensitivity on a large part of the infrared domain, making possible spectral analysis of the most primitive galaxies and of the terrestrial exoplanet atmospheres. A project aiming at the detection of the weak cosmic microwave background spectral distortions is also presented. Several identical 1.5 m cryo-cooled telescopes at 2.5 K to fit in a launcher, with an imaging Fourier transform spectrometer in each unit, deposited in a cold crater and pointing in the same direction in lunar survey mode, would build for this fundamental goal the equivalent of a large telescope at an extremely low temperature. Last, the feasibility of these projects is discussed. This article is part of a discussion meeting issue ‘Astronomy from the Moon: the next decades'.

scholarly journals High-sensitivity measurements of the cosmic microwave background power spectrum with the extended Very Small Array

2004 ◽  
Vol 353 (3) ◽  
pp. 732-746 ◽  
Author(s):  
Clive Dickinson ◽  
Richard A. Battye ◽  
Pedro Carreira ◽  
Kieran Cleary ◽  
Rod D. Davies ◽  
...  
Keyword(s):  
Power Spectrum ◽  
Cosmic Microwave Background ◽  
High Sensitivity ◽  
Microwave Background ◽  
Small Array

scholarly journals High sensitivity static Fourier transform spectrometer

2021 ◽  
Author(s):  
Fabio Frassetto ◽  
Lorenzo Cocola ◽  
Paola Zuppella ◽  
Vania Da Deppo ◽  
Luca Poletto
Keyword(s):  
Fourier Transform ◽  
High Sensitivity ◽  
Fourier Transform Spectrometer

scholarly journals The Cosmic Background Explorer (COBE): Mission and Science Overview

1992 ◽  
Vol 9 ◽  
pp. 273-274 ◽  
Author(s):  
Nancy W. Boggess
Keyword(s):  
Cosmic Microwave Background ◽  
Early Universe ◽  
High Sensitivity ◽  
Far Infrared ◽  
Systematic Errors ◽  
Microwave Background ◽  
Cosmic Background ◽  
Infrared Background ◽  
Microwave Radiometers

Ever since the discovery in 1964 of the Cosmic Microwave Background (CMB), scientists have tried to make accurate measurements of its spectrum and anisotropie3. With the successful COBE mission, major advances in our understanding of the very early universe have been achieved.COBE’s complement of instruments are the Far Infrared Absolute Spectrophotometer (FIRAS), the Differential Microwave Radiometers (DMR), and the Diffuse Infrared Background Experiment (DIRBE). FIRAS and DIRBE are located inside a 4He dewar to operate at 1.5 K. DMR receivers are located around the outside of the dewar. The instruments and mission plan have been described by Gulkis et al. (1990). Essential for the cosmological objectives are the all-sky observing strategy, periodic absolute calibrations of the instruments, high sensitivity, and extensive care to minimize potential systematic errors.

Improved Version of a Microwave Fourier Transform Spectrometer in the Frequency Band from 26 to 40 GHz

1990 ◽  
Vol 45 (5) ◽  
pp. 711-714
Author(s):  
Ch. Keussen ◽  
R. Schwarz ◽  
U. Andresen ◽  
H. Dreizler
Keyword(s):  
Fourier Transform ◽  
Frequency Band ◽  
Carbonyl Sulfide ◽  
High Sensitivity ◽  
Frequency Region ◽  
Natural Abundance ◽  
Fourier Transform Spectrometer ◽  
Rotational Spectra ◽  
Rotational Transitions ◽  
And Performance

Abstract We report the design and performance of an improved version of a microwave Fourier transform spectrometer in the frequency region between 26 and 40 GHz for the investigation of rotational spectra. The performance is illustrated by rotational transitions of allene-d4 and isotopomers of carbonyl sulfide in natural abundance. The high sensitivity of the spectrometer allows the measurement of very weak lines in only a few minutes

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