Results 181 to 190 of about 20,687 (218)

Submillimeter Wave Astronomy Satellite (SWAS) acousto-optical spectrometer

SPIE Proceedings, 1994
The first fully space qualified acousto-optical spectrometer (AOS) is described. It is built for the Submillimeter Wave Astronomy Satellite (SWAS) to be launched in July 1995. It has a very large bandwidth from 1400 to 2800 MHz covered by 1365 channels. This corresponds to a nearly 1 MHz channel spacing. The design is optimized for very high stability,
Markus Klumb, Johannes Frerick, Volker Tolls, Rudolf T. Schieder, Gisbert F. Winnewisser   +4 more
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Optimal Design of Optics for Submillimeter Astronomy (Letters)

IEEE Transactions on Microwave Theory and Techniques, 1974
We have designed two- and three-element shaped reflecting telescopes which minimize diffraction losses and sidelobes for submillimeter radiometric and spectrometric application. New solutions for the near-field output of an off-axis paraboloid when illuminated with a beam of considerable power taper (20 dB) show the merit of using Gaussian illumination
J.E. Beckman, J.A. Shaw
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Molecular Astronomy at Submillimeter Wavelengths

1984
The difficulties of making astronomical observations in the submillimeter spectrum are described in detail. Receiver technology and atmospheric absorption provide the biggest challenge. Techniques of overcoming these problems are discussed and some initial astronomical results are illustrated.
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Radar astronomy at millimeter and submillimeter wavelengths

Proceedings of the IEEE, 1966
The scant two-decade existence of radar astronomy has seen important contributions by this new technique to positional astronomy, to the metrics of the solar system, and to the study of lunar and planetary surfaces. The role of millimeter wavelengths in this new astronomy is discussed and the problems unique to these short wavelengths defined.
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Coherent Detector Arrays for Millimeter and Submillimeter Astronomy

2009
Progress in many areas of astronomy requires large-area surveys and observations of extended objects. This includes the cosmic microwave background, nearby galaxies, the Milky Way, and regions of star-forming regions within our galaxy. The ability to carry out such studies is critically dependent on the development of affordable high-sensitivity focal ...
Goldsmith, Paul F., Carpenter, John M., Erickson, Neal, Fisher, Rick, Ford, John, Todd, Gaier, Groppi, Chris, Harris, Andy, Mark, Heyer, Kulesa, Craig, Lawrence, Charles, Morgan, Matt, Mundy, Lee, Narayanan, Gopal, O'Neil, Karen, Readhead, Tony, Samoska, Lorene, Schloerb, Peter, Snell, Ronald, Walker, Christopher C., Ziurys, Lucy   +20 more
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Radio and Submillimeter Astronomy: Radio Telescopes

2016
Radio astronomy, the first astronomy after the optical one, investigates the radio emission of celestial sources. This chapter discusses the receiver systems based on the superheterodyne technique, investigating the different components: antennas, amplifiers, mixers, and detectors. The faintness of the radio signals demands radio telescope systems with
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Submillimeter Astronomy and Mauna Kea - An Overview

2007 IEEE/MTT-S International Microwave Symposium, 2007
Astronomy in the submillimeter region of the electromagnetic spectrum, covering wavelengths between 1 mm and 0.1 mm, is now just past its 30th anniversary. During this period there has been enormous progress in technology for detecting and analyzing signals. This has led to discovery of astronomical sources not even considered when observations in this
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Highly sensitive heterodyne receivers for submillimeter-wave astronomy

2000
This paper reports the current status in our development of sensitive heterodyne detectors for the efficient down-conversion of submillimeter-wave signals to D-band. These detectors use the strong non-linearities of Nb/Al/AlOx/Nb tunnel junctions and employ waveguide or quasi-optical techniques to couple local-oscillator and radio-frequency signals to ...
D. Andreone, BAVA, ELIO, L. Brunetti, V. Laquaniti, E. Natale, G. Sironi, R. Steni, J. Thorpe   +7 more
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A synthesis arrary for lunar submillimeter astronomy

AIP Conference Proceedings, 1990
This paper describes a system concept for a Synthsis Array for Lunar Submillimeter Astronomy (SALSA). It includes a brief discussion of the science objectives and the advantages of placing such an array on the moon, the system concept, and a top‐level discussion of the various subsystems, including the technology drivers associated with each.
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Radio and Submillimeter Astronomy: Receivers and Spectrometers

2016
This chapter presents the different radio receiver configurations used to achieve the high stability demanded by the high gains required for the detection. The radio spectrometers are discussed. The chapter is closed by a discussion of the measurements of the CMB.
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