Results 211 to 220 of about 9,812 (256)

Instruments and Astronomical Techniques

Astronomy and Astrophysics Abstracts, 1970
Siegfried Böhme, Walter Fricke, Ulrich Güntzel-Lingner   +2 more
exaly   +2 more sources

Laser frequency comb techniques for precise astronomical spectroscopy

Monthly Notices of the Royal Astronomical Society, 2012
Precise astronomical spectroscopic analyses routinely assume that individual pixels in charge-coupled devices (CCDs) have uniform sensitivity to photons.
Michael T Murphy, Clayton R Locke, P S Light   +2 more
exaly   +3 more sources

4. The evolution of astronomical techniques

1978
exaly   +2 more sources

A multiplex technique for astronomical imagery in the infrared

Infrared Physics, 1977
Abstract We describe an application of a new technique of image coding to astronomy in the near infrared (λ = 2 μm). The code is materialised by a grid with transmission properties allowing real time decoding using the Fast Hadamard Transform (F.H.T.). This method allows us to approach the theoretical angular resolution of the telescope.
B. De Batz, S. Bensammar, J. Delavaud, J. Gay, A. Journet   +4 more
openaire   +1 more source

Applying astronomical techniques to multiphoton microscopy

Frontiers in Optics 2004/Laser Science XXII/Diffractive Optics and Micro-Optics/Optical Fabrication and Testing, 2004
The ability of multiphoton microscopy to image deeply into living tissue with minimal damage is revolutionizing life science microscopy. However, tissue induced aberrations degrade the image quality, similar to that of atmospheric turbulence on ground based telescopes.
J M Girkin, A J Wright
openaire   +1 more source

Deconvolution techniques applied to astronomical images

Journal of Optics, 1979
The main features of the restoration analysis described utilize an apodizing filter technique to remove the noise and compensate for the seeing. The non-appearance of oscillations in the restitution error allows, using the a priori knowledges about the object, to decrease the limitation due to a raw determination of the smearing function.
G Coupinot, J Hecquet
openaire   +1 more source

Teaching astronomical speckle techniques

European Journal of Physics, 2001
This paper gives an introduction to speckle techniques developed for high angular-resolution imagery in astronomy. The presentation is focussed on fundamental aspects of the techniques of Labeyrie and Weigelt. The formalism used is that of Fourier optics and statistical optics, and corresponds to graduate level.
openaire   +1 more source

Calibration techniques for next-generation astronomical systems

SPIE Proceedings, 2006
Historically, few astronomical measurements have required sub-percent accuracy in photometry. Measuring SNIa fluxes in order to determine cosmological parameters, however, often requires the comparison of images from different telescopes, and at different redshifts. This can introduce a myriad of sources of error.
S. Slater, C. W. Stubbs, J. L. Tonry, J. R. Masiero, R. C. Smith   +4 more
openaire   +1 more source

Realization of Different Techniques for Anomaly Detection in Astronomical Databases

2020
In this work we address the problem of anomaly detection in large astronomical databases by machine learning methods. The importance of such study is justified by the existence of a large amount of astronomical data that can not be processed only by human resource. We evaluated five anomaly detection algorithms to find anomalies in the light curve data
Konstantin L. Malanchev, Vladimir S. Korolev, Matwey V. Kornilov, Emille E. O. Ishida, Anastasia Malancheva, Florian Mondon, Maria V. Pruzhinskaya, Sreevarsha Sreejith, Alina Volnova   +8 more
openaire   +1 more source

Optical properties of astronomical silicates with infrared techniques

SPIE Proceedings, 2010
Astronomical dust is observed in a variety of astrophysical environments and plays an important role in radiative processes and chemical evolution in the galaxy. Depending upon the environment, dust can be either carbon-rich or oxygen-rich (silicate grains).
R. E. Kinzer, Jr., S. Rinehart, D. Benford, E. Dwek, R. Henry, J. Nuth, R. Silverberg, C. Wheeler, E. Wollack   +8 more
openaire   +1 more source