Results 241 to 250 of about 657,845 (275)
Some of the next articles are maybe not open access.
Large-aperture synthetic aperture imaging ladar
Optical Engineering, 2018A strip-mode side-looking large-aperture synthetic aperture imaging ladar (SAIL) based on free-space optics is designed to experimentally verify the key performances for further airborne application. The optical difficulties in the spatial domain, including optical antenna and imaging resolution for large-aperture SAIL, are considered systematically ...
Yanan Zhi +6 more
openaire +1 more source
Applied Optics, 2009
Holographic aperture ladar is a variant of synthetic aperture ladar that seeks to increase cross-range scene resolution by synthesizing a large effective aperture through the motion of a smaller receiver and through the subsequent proper phasing and correlation of the detected signals in postprocessing.
Duncan, Bradley D., Dierking, Matthew P.
openaire +3 more sources
Holographic aperture ladar is a variant of synthetic aperture ladar that seeks to increase cross-range scene resolution by synthesizing a large effective aperture through the motion of a smaller receiver and through the subsequent proper phasing and correlation of the detected signals in postprocessing.
Duncan, Bradley D., Dierking, Matthew P.
openaire +3 more sources
Journal of Applied Physics, 1955
The diffraction of plane electromagnetic waves by apertures in a plane screen which is infinitesimally thin and perfectly conducting is studied both theoretically and experimentally. The theoretical analysis employs a dyadic Green's function to develop vector formulas for the scattered fields, and from these formulas integral equations are obtained for
Huang, Chaang +2 more
openaire +2 more sources
The diffraction of plane electromagnetic waves by apertures in a plane screen which is infinitesimally thin and perfectly conducting is studied both theoretically and experimentally. The theoretical analysis employs a dyadic Green's function to develop vector formulas for the scattered fields, and from these formulas integral equations are obtained for
Huang, Chaang +2 more
openaire +2 more sources
Optics Letters, 2008
A variable aperture has been fabricated and demonstrated using polydimethylsiloxane-based optofluidic technology. The device consists of a deformable membrane, an air pressure chamber, a cavity filled with light-absorbing liquid, and a rigid transparent upper plate.
Yu, H., Zhou, G., Chau, F.S., Lee, F.
openaire +2 more sources
A variable aperture has been fabricated and demonstrated using polydimethylsiloxane-based optofluidic technology. The device consists of a deformable membrane, an air pressure chamber, a cavity filled with light-absorbing liquid, and a rigid transparent upper plate.
Yu, H., Zhou, G., Chau, F.S., Lee, F.
openaire +2 more sources
2014
In the beginning God created the world. Waste and void, waste and void. And darkness was upon the face of the deep. And when there were men, in their various ways, they struggled in torment towards God. Blindly and vainly, for man is a vain thing, and man without God is a seed upon the wind: driven this way and that, and finding no place of lodgement ...
openaire +3 more sources
In the beginning God created the world. Waste and void, waste and void. And darkness was upon the face of the deep. And when there were men, in their various ways, they struggled in torment towards God. Blindly and vainly, for man is a vain thing, and man without God is a seed upon the wind: driven this way and that, and finding no place of lodgement ...
openaire +3 more sources
Journal of the Optical Society of America A, 2001
Beams of a high angle of convergence and divergence are called high-aperture beams. Different ways of defining high-aperture generalizations to paraxial beams are reviewed for both scalar beams and electromagnetic beams. The different approaches are divided into three types. The particular examples of Gaussian beams and Bessel beams are discussed.
openaire +2 more sources
Beams of a high angle of convergence and divergence are called high-aperture beams. Different ways of defining high-aperture generalizations to paraxial beams are reviewed for both scalar beams and electromagnetic beams. The different approaches are divided into three types. The particular examples of Gaussian beams and Bessel beams are discussed.
openaire +2 more sources
The Segmented Aperture Synthetic Aperture Radar (SASAR)
IEEE Transactions on Aerospace and Electronic Systems, 1974A new concept in synthetic aperture radar, called SASAR, which uses a segmented aperture, is described. Use of the segmented aperture allows appreciable extra receiving antenna gain to be realized. Each subarray of the receive antenna is equal in length to the transmit antenna; the system performance is increased approximately by a factor equal to the ...
openaire +1 more source