Results 241 to 250 of about 140,683 (272)

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
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Structural design techniques applied in astronomical instruments

Ground-based and Airborne Telescopes VII, 2018
We present in this article some of the techniques applied at the Instituto de Astronomia of the Universidad Nacional Autonoma de Mexico (IA-UNAM) to the mechanical structural design for astronomical instruments. With this purpose we use two recent projects developed by the Instrumentation Department.
Tinoco, Silvio J, Tejada, Carlos, Quirós, Fernando, Floriot, J, Corre, D, Ferrari, M, Hugot, E, Dohlen, K, Platzer, J, Klotz, A, Attéia, J.L, Boy, J, Ambert, P, Le Borgne, J.F, Dornic, D, Cordier, B, Ronayette, S, Blanc, P.E, Farah, Alejandro S, Watson, Alan M, Cuevas Cardona, Salvador, Fuentes-Fernández, Jorge, Ángeles, Fernando, Langarica, Rosaliá, Ruíz-Diáz-Soto, Jaime, Marcos, M, Basa, S, Pallier, E, Valentin, H, Mathon, R, Meessen, C, Ageron, M, Boulade, O, Dubreuil, D, Gallais, P, Le van Suu, A, Dolon, F   +36 more
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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.
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Navigation techniques for large-scale astronomical exploration

SPIE Proceedings, 2006
Navigating effectively in virtual environments at human scales is a difficult problem. However, it is even more difficult to navigate in large-scale virtual environments such as those simulating the physical Universe; the huge spatial range of astronomical simulations and the dominance of empty space make it hard for users to acquire reliable spatial ...
Chi-Wing Fu, Andrew J. Hanson, Eric A. Wernert   +2 more
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Radio Astronomical Techniques

2011
An alternative method for detecting CMEs is known as interplanetary scintillation (IPS). This monitors fluctuations in distant low frequency radio sources, which when mapped across the sky can provide information on the density structure of a heliospheric transient. This chapter discusses the theory behind IPS and how it can be used to detect and track
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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
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Speckle Interferometric Technique for Astronomical Observations

Journal of Optics, 2003
The speckle imaging is a photographic technique that resolves objects viewed through severely distorted media. The results are insensitive to the errors caused by apparent size of the isoplanatic patch and the telescope aberrations. In this paper, a short descriptions of the atmospheric turbulence and its effect on the flat wavefront from a stellar ...
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Optical technique for inner-scale measurement: possible astronomical applications

Applied Optics, 1997
We propose an optical technique that allows us to estimate the inner scale by measuring the variance of angle of arrival fluctuations of collimated laser beams of different sections w (i) passing through a turbulent layer. To test the potential efficiency of the system, we made measurements on a turbulent air flow generated in the laboratory, the ...
E, Masciadri, J, Vernin
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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
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Analysis of RHESSI Flares Using aRadio Astronomical Technique

Solar Physics, 2007
We have used Ramaty High Energy Solar Spectroscopic Imager (RHESSI) modulation profiles in the 25 – 300 keV range to construct high-fidelity visibilities of 25 flares having at least two components. These hard X-ray visibilities, which are mathematically identical to the visibilities of radio imaging, were input to software developed for mapping solar ...
E. J. Schmahl, R. L. Pernak, G. J. Hurford, J. Lee, S. Bong   +4 more
openaire   +1 more source