Results 231 to 240 of about 2,975,863 (286)
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Apodization of annular apertures: Strehl ratio
Applied Optics, 1988We show that for any rotationally symmetric apodizer on the full aperture, there is a family of apodizers on the annular aperture with the same functional Strehl ratio vs defocus (W(20)) and vs spherical aberration (W(40)). However, in the latter case, the coefficients W(20) and W(40) are reduced by the factors (1 - epsilon(2)) and (1 - epsilon(2))(2 ...
J, Ojeda-Castaneda, E, Tepichin, A, Pons
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An affect of the aperture length to aperture width ratio on broadband shielding effectiveness
2011 XXXth URSI General Assembly and Scientific Symposium, 2011The influence of an aperture area (between 2λ2 and 11λ2) on the Shielding Effectiveness of metallic enclosures has been measured in an anechoic chamber, and wavelength dependent SE measurements are introduced. Measurement setup was established operating between 6GHz to 13GHz.
I. Bahadir Basyigit +3 more
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Signal-to-noise ratio of Singer product apertures
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2017Abstract Formulae for the signal-to-noise ratio (SNR) of Singer product apertures are derived, allowing optimal Singer product apertures to be identified, and the CPU time required to decode them is quantified. This allows a systematic comparison to be made of the performance of Singer product apertures against both conventionally wrapped Singer ...
Paul M.E. Shutler, Kevin Byard
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Signal-to-noise ratio in coded aperture imaging
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2012Abstract We present a derivation of the signal-to-noise ratio (SNR) of a cyclic difference set (CDS) based coded mask which is simpler than that given in the literature, and which applies to any distribution of flux against the mask, not just Poisson statistics as is currently the case.
Paul M.E. Shutler +2 more
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Concept of field-to-resolution ratio in aperture synthesis
SPIE Proceedings, 1994The analysis of the imaging properties of an interferometric device essentially depends on the parameters that govern the Fourier synthesis operation: extension and density of the experimental frequency coverage (resolution, field, robustness), size and nature of the input errors (input data for the study of the error propagation).
Andre Lannes +3 more
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A Miniaturized Design of Shared-aperture Antenna with High Aperture Reuse Ratio for 5G Applications
2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring), 2019A novel 3.5/38 GHz dual-band shared-aperture antenna is proposed in this paper. Miniaturization technology of the patch antenna is introduced into the shared-aperture antenna for the first time to reduce the occupied area. Meanwhile, high aperture reuse ratio and high channel isolation are achieved to support the sub-6G and the millimeter-wave antennas
Chun Xu Bai, Yu Jian Cheng
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Hybrid Area‐Emitting Transistors: Solution Processable and with High Aperture Ratios
Advanced Materials, 2015Area emission is realized in all-solution-processed hybrid light-emitting transistors (HLETs). A new HLET design is presented with increased aperture ratio, and optical and electrical characteristics are shown.
Muhieddine, Khalid +4 more
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Aperture intensity ratio fiber-optic displacement sensor
Review of Scientific Instruments, 1987A displacement sensor based on the ratio of fiber-optic light emitted from two fixed position optical fibers into a third, movable fiber connected to a photodetector is described. Square-wave modulated light of opposite phases produces a corresponding square wave at the detector which has zero ac amplitude at the center position and an amplitude ...
Darold Wobschall, Shahram Hejazi
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Influence of Rectangular Aperture Aspect Ratio on Sheet Beam Generation
2019 International Vacuum Electronics Conference (IVEC), 2019A Pseudospark discharge based miniaturized sheet electron beam gun has been simulated using COMSOL Multiphysics software. The simulation has been performed to propose the dependency of the aspect ratio of rectangular aperture of hollow cathode on the onset of hollow cathode phase (HCP) as well as the HCP duration.
Nikita Gurjar +3 more
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The Journal of the Acoustical Society of America, 2003
Coupled volumes typically consist of two spaces connected through an opening known as a coupling aperture. If the absorption characteristics in the auxiliary space are such that its decay time is longer than that of the main space, late-arriving energy will be fed back into the main space by the secondary volume.
David T. Bradley, Lily M. Wang
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Coupled volumes typically consist of two spaces connected through an opening known as a coupling aperture. If the absorption characteristics in the auxiliary space are such that its decay time is longer than that of the main space, late-arriving energy will be fed back into the main space by the secondary volume.
David T. Bradley, Lily M. Wang
openaire +1 more source