Results 21 to 30 of about 2,867,884 (276)

Recent developments in superconducting tunnel junctions for ultraviolet, optical & near infrared astronomy [PDF]

Astronomy and Astrophysics Supplement Series, 1998
Some recent results associated with the development of tantalum based photon counting superconducting tunnel junctions (STJ) suitable for use as broad-band low resolution spectrometers for optical and ultraviolet astronomy are presented. A m square tantalum based STJ, operated at a temperature of 0.3 K, has demonstrated a limiting resolution of  nm at ...
T. Peacock, P. Verhoeve, N. Rando, C. Erd, M. Bavdaz, B. G. Taylor, D. Perez   +6 more
openaire   +1 more source

Retrieval of Carbon Monoxide Vertical Column Densities from SCIAMACHY Infrared Nadir Observations [PDF]

, 2008
Nadir observations in the shortwave infrared channels of SCIAMACHY onboard the ENVISAT satellite can be used to derive information on CO, CH4, N2O, CO2, and H2O.
Doicu, Adrian, Franz Schreier, Gimeno-Garcia, Sebastian, Hess, Michael, A. Doicu, Schreier, Franz, Lichtenberg, Günter, G. Lichtenberg, Sebastián Gimeno‐García, M. Hess   +9 more
core   +1 more source

Portable microcontroller-based instrument for near-infrared spectroscopy [PDF]

, 2000
Near Infrared Spectroscopy (NIRS) can be employed to noninvasively and continuously measure in-vivo local changes in haemodynamics and oxygenation of human tissues.
Giardini, Mario Ettore, Lago, Paolo, Corti, Mario, Gelmetti, Andrea   +3 more
core   +3 more sources

Near-infrared Polarization Charateristics of the Zodiacal Light Observed with DIRBE/COBE

The Astrophysical Journal, 2023
We report near-infrared polarization of the zodiacal light (ZL) measured from space by the Diffuse Infrared Background Experiment (DIRBE) on board the Cosmic Background Explorer in photometric bands centered at 1.25, 2.2, and 3.5 μ m.
Kohji Takimoto, Shuji Matsuura, Kei Sano, Richard M. Feder   +3 more
doaj   +1 more source

The application of near infrared spectroscopy in nutritional intervention studies [PDF]

, 2013
Functional near infrared spectroscopy (NIRS) is a non-invasive optical imaging technique used to monitor cerebral blood flow (CBF) and by proxy neuronal activation.
Kennedy, David, Philippa A Jackson, David O. Kennedy, David O Kennedy, Philippa A. Jackson, Jackson, Philippa   +5 more
core   +1 more source

Far-ultraviolet to Near-infrared Observations of SN 2023ixf: A High-energy Explosion Engulfed in Complex Circumstellar Material

The Astrophysical Journal Letters, 2023
We present early-phase panchromatic photometric and spectroscopic coverage spanning the far-ultraviolet to near-infrared regime of the nearest hydrogen-rich core-collapse supernova (SN) in the last 25 yr, SN 2023ixf.
Rishabh Singh Teja, Avinash Singh, Judhajeet Basu, G. C. Anupama, D. K. Sahu, Anirban Dutta, Vishwajeet Swain, Tatsuya Nakaoka, Utkarsh Pathak, Varun Bhalerao, Sudhanshu Barway, Harsh Kumar, Nayana A. J., Ryo Imazawa, Brajesh Kumar, Koji S. Kawabata   +15 more
doaj   +1 more source

First tests of a 1 megapixel near-infrared avalanche photodiode array for ultra-low background space astronomy

X-Ray, Optical, and Infrared Detectors for Astronomy X, 2022
Spectroscopy of Earth-like exoplanets and ultra-faint galaxies are priority science cases for the coming decades. Here, broadband source flux rates are measured in photons per square meter per hour, imposing extreme demands on detector performance, including dark currents lower than 1 e-/pixel/kilosecond, read noise less than 1 e-/pixel/frame, and ...
Claveau, Charles-Antoine, Bottom, Michael, Jacobson, Shane, Hodapp, Klaus, Walk, Aidan, Loose, Markus, Baker, Ian, Zemaityte, Egle, Hicks, Matthew, Barnes, Keith, Powell, Richard, Bradley, Ryan, Moore, Eric   +12 more
openaire   +2 more sources

The use of near infrared (NIR) spectroscopy to improve soil mapping at the farm scale [PDF]

, 2008
The creation of fine resolution soil maps is hampered by the increasing costs associated with conventional laboratory analyses of soil. In this study, near infrared (NIR) reflectance spectroscopy was used to reduce the number of conventional soil ...
Söderström, Mats, Stenberg, Bo, Wetterlind, Johanna   +2 more
core   +2 more sources

Alignment of the grating wheel mechanism for a ground-based cryogenic near-infrared astronomy instrument [PDF]

SPIE Proceedings, 2003
We describe the population, optomechanical alignment, and alignment verification of near-infrared gratings on the grating wheel mechanism (GWM) for the Infrared Multi-Object Spectrometer (IRMOS). IRMOS is a cryogenic (80 K), principle investigator-class instrument for the 2.1 m and Mayall 3.8 m telescopes at Kitt Peak National Observatory, and a MEMS ...
Sharon M. Gutkowski, Raymond G. Ohl, Jason E. Hylan, John G. Hagopian, Stephen E. Kraft, J. E. Mentzell, Joseph A. Connelly, Joseph P. Schepis, Leroy M. Sparr, Matthew A. Greenhouse, John W. MacKenty   +10 more
openaire   +1 more source

The Mauna Kea Observatories Near‐Infrared Filter Set. II. Specifications for a NewJHKL′M′ Filter Set for Infrared Astronomy [PDF]

Publications of the Astronomical Society of the Pacific, 2002
We present a description of a new 1--5 $μ$m filter set similar to the long-used JHKLM filter set derived from that of Johnson. The new Mauna Kea Observatories Near-Infrared (MKO-NIR) filter set is designed to reduce background noise, improve photometric transformations from observatory to observatory, provide greater accuracy in extrapolating to zero ...
Tokunaga, A., Simons, D., Vacca, W.
openaire   +3 more sources