Results 181 to 190 of about 325,753 (218)

Thermo-optical piston in gases

AIP Conference Proceedings, 2014
The new steady state of the gas – thermo-optical pressure difference is considered. This condition occurs in the gas that is in a closed capillary in the field of resonant laser radiation and a temperature gradient. The pressure difference at the ends of the capillary is determined by the interaction of three fluxes – thermal creep, the light-induced ...
I. V. Chermyaninov, V. G. Chernyak
openaire   +2 more sources

Optical Piston Temperature in an internal combustion engine

SAE International Journal of Engines, 2011
In the last ten year the mechanical power output of car engine increased significantly. This result has been possible especially through new injection systems that brought to an optimization of the combustion (direct injection, common rail) and to an improvement of the turbo charging.
SENATORE, ADOLFO, BUONO, DARIO, E. Iarrobino   +2 more
openaire   +4 more sources

Phase separation and droplet nucleation induced by an optical piston

Physical Review E, 1994
no ...
Delville, J. P., Lalaude, C., Freysz, E., Ducasse, A.   +3 more
openaire   +4 more sources

High-fill-factor adaptive optics mirrors with independent piston, tip and tilt controls

, 2006
Dennis S. Greywall
openalex   +2 more sources

The optical piston in a capillary cell with open ends

Journal of Physics B: Atomic, Molecular and Optical Physics, 1988
The authors present measurements of the time evolution of the spatial density distribution of Na atoms in an argon buffer gas, inside a capillary cell with open ends. The entrance of the capillary is irradiated with a laser beam that fills its cross section, so that light-induced drift occurs. For sufficiently high intensity, a steep front may build up,
H G C Werij, J. P. Woerdman, G Nienhuis
openaire   +2 more sources

Object-independent piston diagnosing approach for segmented optical mirrors via deep convolutional neural network.

Applied Optics, 2020
Piston diagnosing approaches based on neural networks have shown great success, while a few methods are heavily dependent on the imaging target of the optical system. In addition, they are inevitably faced with the interference of submirrors.
Mei Hui, Weiqian Li, Ming Liu, Liquan Dong, Lingqin Kong, Yuejin Zhao   +5 more
semanticscholar   +1 more source

Dynamics of the Optical Piston

1985
Recently we have demonstrated a semipermeable optical piston [1] using the principle of light-induced drift (LID) [2]. In the present work,new experimental results on the dynamics of the optical piston are reported and compared with theory. The basic idea of LID and the optical piston is as follows.
Jos E. M. Haverkort, H. G. C. Werij, J. P. Woerdman, W. A. Hamel, R. W. M. Hoogeveen   +4 more
openaire   +2 more sources

Fizeau beam-combination for optical astronomy: piston retrieval

SPIE Proceedings, 2003
The field of view for the first generation VLTI instruments (VINCI, MIDI, AMBER etc.) is limited to the diffraction limited beam of a single telescope (for a 8.2-meter telescope at 2-micron this is 0.6 arcseconds). However, the VLTI infrastructure with its main delay lines, transfers a 2 arcseconds beam from the telescopes to the interferometric ...
Eric J. Bakker, Rudolf S. Le Poole
openaire   +2 more sources

The Giant Magellan Telescope’s high contrast adaptive optics testbed: NGAO wavefront sensing and control laboratory results

Astronomical Telescopes + Instrumentation
The Natural Guide-star Adaptive Optics (NGAO) mode of the Giant Magellan Telescope (GMT) is one of the two diffraction-limited AO modes under development by GMTO and its partner institutions.
F. Quirós-Pacheco, A. Bouchez, C. Plantet, Bo Xin, Jordi Molgó, William Schoenell, Alfio T. Puglisi, Fabio Rossi, Patricio Schurter, J. Haddad, R. Demers, Simone Esposito, A. Cheffot, Nicolò Azzaroli, L. Carbonaro, T. Lapucci, E. Pinna, Laird M. Close, S. Haffert, M. Kautz, J. Males, Avalon Mcleod, A. Hedglen, V. Gasho, Marcos A. van Dam   +24 more
semanticscholar   +1 more source

Piston error correction of sparse aperture systems using the metaheuristic stochastic parallel gradient descent algorithm.

Applied Optics, 2020
The next generation of optical telescopes will provide high-resolution imaging of celestial objects by using the aperture synthesis technique. To preserve the quality of the image, fast corrections of the pistons among subapertures have to be applied ...
Kaiyuan Yang, Zongliang Xie, Haotong Ma, Hongyi Hu, Bo Qi, Jianliang Shi, Qiang Wang, Wenyi Lv   +7 more
semanticscholar   +1 more source