Results 151 to 160 of about 3,081 (186)

Submillimeter and Far-Infrared Observing Platforms for Astronomy

2001
During the next decade several airborne and space-borne platforms for far-infrared and submillimeter astronomy and spectroscopy will become operational These observatories will provide sensitivity and spatial resolution several times better than previous missions.
Hübers, H.-W., Röser, H. P.
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Far-infrared stellar astronomy

Symposium - International Astronomical Union, 1966
The photometer with which I am presently observing stellar radiation responds in the wavelength band extending from 8 to 14 microns. I believe common usage places the boundary between the intermediate and far infrared at 10 microns. From the title of this paper one may therefore infer that what I say today is at least one-third wrong from the start.
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The Potential for Far-infrared Astronomy in Australia

Publications of the Astronomical Society of Australia, 1982
Despite its superb optical and radio observatories, Australia is essentially blind to the entire submillimeter and far-infrared spectrum. The importance of this spectral region can perhaps best be illustrated by reference to Figure 1, which shows the flux of the galaxy NGC253 as a function of frequency.
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A discussion on infared astronomy - A far infrared sky survey

Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 1969
Abstract A balloon-borne instrument for making far infrared sky surveys with 2° angular resolution is described. In two initial flights at a wavelength of 320 μm approximately half of the celestial sphere including most of the northern milky way was surveyed. The thermal emission of the moon was alone detected.
N. J. Woolf, W. F. Hoffman, C. L. Frederick, F. J. Low   +3 more
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GaAs homojunction far-infrared detectors for astronomy applications

SPIE Proceedings, 1998
ABSTRACT A high performance, bias tunable, p-GaAs homojunction interfacial workfunction internal photoemission (HI-WIP) far-infrared (FIR) detector has been demonstrated. A responsivity of 3.10 0.05 A/W, a quantum efficiencyof 12.5 %, and a detectivity D* of 5.9x10'° cmv'ii/W (NEP of 4.4x10'3 W/v"i), were obtained at 4.2K, forcutoff wavelengths from 80
A. G. Unil Perera, W. Z. Shen, M. H. Francombe, Mark A. Shure, Hui C. Liu, Margaret Buchanan, William J. Schaff   +6 more
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Limitations of ground based near and far infrared astronomy

Infrared Physics, 1975
Abstract The possibilities of ground based infrared astronomy are discussed. It is shown that telescopes used up to now are not optimized and that the Diffraction Limited Detectivity conditions (DLD) cannot be reached, in the near infrared, by the larger telescopes. The maximum useful diameters for near i.r. and far i.r.
G. Dall'Oglio, I. Guidi, B. Melchiorri, F. Melchiorri, V. Natale   +4 more
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An array photometer for air-borne far infrared astronomy

Astrophysics and Space Science, 1985
We describe here a far-infrared photometer capable of detecting simultaneously in three bands in the region 20–120 microns, each band having an array of 3 or 4 photoconductive detectors. We present and discuss its laboratory performance and the results obtained on the planet Venus during an air-borne observational programme using a 32.5 cm telescope ...
P. B. Van Der Wal, B. G. Anandarao, D. Rouan, P. Léna, M. De Muizon, J. Wijnbergen   +5 more
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A Far-Infrared Heterodyne Spectrometer for Airborne Astronomy

1988
The design and construction of a novel heterodyne spectrometer for airborne astronomy in the 50 µm - 200 µm wavelength range is described. along with laboratory measurements of its performance. A bulk, extrinsic Ge:Ga photoconductor is used as the mixer.
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Cryogenic detectors for infrared astronomy: the Single Aperture Far-InfraRed (SAFIR) Observatory

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2004
Abstract The development of a large, far-infrared telescope in space has taken on a new urgency with breakthroughs in detector technology and recognition of the fundamental importance of the far-infrared spectral region to questions ranging from cosmology to our own Solar system.
Dominic J. Benford, S.Harvey Moseley
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Balloon-Borne Telescopes for Far-Infrared Astronomy

1977
I would like to present some of the background and current activity in balloon-borne infrared astronomy, to examine a number of astronomical objectives in terms of their technical requirements, to describe some of the unique characteristics of ballooning techniques, and to illustrate how the objectives and techniques are mated with some specific ...
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