Results 251 to 260 of about 48,747 (277)

EUV Astronomical Spectroscopy With CCD Detectors

SPIE Proceedings, 1986
The applicability of CCD detectors to astronomical extreme ultraviolet (EUV) spectroscopy (100-1250 A) is discussed. The advantages of CCDs in this spectral region include internal electron yield, the potential for very high quantum efficiency (about 50-90 percent), and broad wavelength response.
R. A. Stern, R. C. Catura, M. M. Blouke, M. Winzenread   +3 more
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The Astronomical Potential of Optical Superconducting Detectors

Experimental Astronomy, 1997
The operational principles, current experimental status, and astronomical potential of a promising new class of optical photon detector based on superconductors is presented.
M.A.C. Perryman, A. Peacock, N. Rando, P. Verhoeve   +3 more
openaire   +1 more source

Josephson Detectors Make Astronomical Observations

Physics Today, 1970
Since the discovery of the Josephson effect, astronomers have been intrigued with the possibility of using junctions of two superconductors connected by a weak link to detect millimeter and submillimeter radiation from astronomical objects. Now Bruce T.
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Advances in detectors for astronomical spectroscopy

Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 1982
Image-reproducing detectors for ultraviolet, optical and near infrared spectroscopic applications in astronomy are described. Emphasis is placed on detectors of the image photon-counting type and on charge-coupled devices.
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Large format imaging photon detector for astronomical spectroscopy

Review of Scientific Instruments, 1987
We describe the design and development of a large format 40-mm active diameter imaging photon detector. The design comprises an S20 semitransparent photocathode proximity focused onto a stack of two microchannel plates clamped back to back having channel length to diameter ratios of 80:1.
M. Clampin, R. P. Edwin
openaire   +1 more source

The Astronomical Detector

2016
The charge-coupled device (CCD) is the foremost imaging device in observational astronomy. The CCD has high quantum efficiency and linearity compared to film, but it suffers from several sources of noise. We illustrate how to reduce noise by backing and applying flat, bias, and dark frames.
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Integrated detector array preprocessing for infrared astronomical applications

Conference on 'Smart' Sensors, 1978
On-board preprocessing of astronomical data from integrated infrared detector arrays and discrete detectors will allow increases in sensitivity and reductions in costs for observations from cryogenic space telescopes. A variety of preprocessing functions for this application, which could be implemented either through analog on-chip devices or through ...
C. MCCREIGHT, H. LUM
openaire   +1 more source

P-I-N Diode Detectors for Astronomical Photometry

Applied Optics, 1968
The incident quantum efficiency eta(i)(lambda) and apparent noise input power (ANEP) were measured for two P-I-N photodiodes. Typical values at lambda8000 A are 0.68 x 10(-15) W and 3.3 x 10(-15) W, respectively. Several potential uses of this kind of detector for astronomical photometry and spectrometry are considered.
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Considerations about far infrared detectors for astronomical purposes

Infrared Physics, 1973
Abstract In this paper we are dealing with the “throughput” ΩS and with the optical bandwidth Δλ of an IR-detector when it is employed at the focus of a telescope to observe point-like sources. We have found that the maximum signal-to-noise ratio is obtained for ΩS≃ λ2 and Δλ ≃ λ.
B. Carli, F. Melchiorri
openaire   +1 more source

Astronomical detectors for .001 to 300000 AA, an overview

Journal of Optics, 1987
A variety of imaging devices are necessary in astronomy, not only to cover the observable electromagnetic spectrum but also because of constraints on time resolution and signal-to-noise. Representative imagers are listed and a few specific applications discussed.
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