Results 201 to 210 of about 5,123 (230)

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
openaire   +1 more source

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
openaire   +1 more source

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.
openaire   +1 more source

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
openaire   +1 more source

A scanning Fabry-Perot interferometer for far-infrared balloon astronomy

Infrared Physics, 1978
Abstract Design and performance details of a scanning Fabry-Perot interferometer developed for far-infrared balloon astronomy are presented. Scanning is achieved mechanically by a parallel spring arrangement and plate spacing is measured by capacitance micrometry.
M.F. Kessler, R.D. Joseph, J. Allen
openaire   +1 more source

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 ...
openaire   +1 more source

Lumped element kinetic inductance detectors for far-infrared astronomy

SPIE Proceedings, 2008
We describe a new type of FIR detector based on lumped element superconducting resonators (LEKIDs). Thesedevices can act as distributed FIR radiation absorbers without the need for an additional coupling structure.In addition, these devices can be integrated into a compact filled array geometry with high filling factor.
Simon Doyle, Jack Naylon, Philip Mauskopf, Adrian Porch, Stafford Withington, David Goldie, Dorota M. Glowacka, Jochem J. A. Baselmans, Stephen J. C. Yates, Henk Hoevers   +9 more
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Bandpass interference filters for very far infrared astronomy

Infrared Physics, 1980
Abstract Three bandpass filters have been constructed for use with a 0.3K bolometer. The center frequencies and bandwidths of the filters are chosen to correspond with the 1, 2 and 3 mm atmospheric windows. The filters are formed of resonant metallic grids separated by air spacers.
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Atmospheric windows and broad band photometry in far infrared astronomy

Infrared Physics, 1974
Abstract The far infrared atmospheric windows between 30 cm −1 and 5 cm −1 have been investigated during many months of observations at the Alpine Station of Testa Grigia (3500 m a.s.l.). The seasonal and diurnal variation of the atmospheric transmittance for each window have been measured.
Dall'Oglio G., S. Fonti, B. Melchiorri, F. Melchiorri, V. Natale, P. P. Lombardini, S. Sivertsen, TRIVERO, Paolo   +7 more
openaire   +1 more source

A 102-cm Balloon-Borne Telescope for Far-Infrared Astronomy

Optical Engineering, 1977
The Center for Astrophysics-University of Arizona balloon-borne, inertially-guided, 102 cm telescope was designed to perform photometry and high resolution mapping of far-infrared (40-250 micron) celestial sources. To date the telescope has now been flown and successfully recovered a total of ten times.
openaire   +1 more source