The Experts below are selected from a list of 300 Experts worldwide ranked by ideXlab platform
Zhang, Mendeley T Data) - One of the best experts on this subject based on the ideXlab platform.
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Dataset on tip vortex formation noise produced by wall-mounted finite airfoils with sinusoidal and porous airfoil tip geometries
2020Co-Authors: Zhang, Mendeley T Data)Abstract:This dataset consists of measurements of tip vortex formation noise produced by finite length airfoils with sinusoidal and porous tips. These data were obtained using the specialist aeroacoustic test facilities at the Brandenburg University of Technology (BTU) in Cottbus, Germany and a 47-channel planar microphone array. Over 2600 unique test cases with variations in airfoil profile shape, tip geometry, angle of attack and Reynolds number were measured during the experimental campaign. The dataset contains one-third-Octave Band tip noise spectra that have been processed using Acoular, a Python module for acoustic beamforming
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Dataset on tip vortex formation noise produced by wall-mounted finite airfoils with flat and rounded tip geometries
2019Co-Authors: Zhang, Mendeley T Data)Abstract:This dataset consists of measurements of tip vortex formation noise produced by finite-length airfoils with flat and rounded tips. These data were obtained using the specialist aeroacoustic test facilities at the Brandenburg University of Technology (BTU) in Cottbus, Germany and a 47-channel planar microphone array. Over 1200 unique test cases with variations in airfoil profile shape, tip geometry, angle of attack and Reynolds number were measured during the experimental campaign. The dataset contains one-third-Octave Band tip noise spectra that have been processed using Acoular, a Python module for acoustic beamforming
Takashige Omatsu - One of the best experts on this subject based on the ideXlab platform.
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Octave Band tunable optical vortex parametric oscillator
Optics Express, 2016Co-Authors: Aizitiaili Abulikemu, Taximaiti Yusufu, Roukuya Mamuti, Shungo Araki, Katsuhiko Miyamoto, Takashige OmatsuAbstract:We developed an Octave-Band tunable optical vortex laser based on a 532 nm optical vortex pumped optical parametric oscillator with a simple linear-cavity configuration by employing cascaded non-critical phase-matching LiB3O5 crystals. The optical vortex output was tunable from 735 to 1903 nm. For a pump energy of 9 mJ, an optical vortex pulse energy of 0.24-2.36 mJ was obtained, corresponding to an optical-optical efficiency of 0.3-26%.
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Octave Band tunable 0 74 1 89μm optical vortex laser
Conference on Lasers and Electro-Optics, 2016Co-Authors: Aizitiaili Abulikemu, Taximaiti Yusufu, Roukuya Mamuti, Katsuhiko Miyamoto, Takashige OmatsuAbstract:We developed an Octave-Band tunable optical vortex laser based on a 0.532-μm optical vortex-pumped optical parametric oscillator with an extended cavity configuration by employing cascaded non-critical phase-matching LiB 3 O 5 crystals. The optical vortex output was tuned within a wavelength range of 735nm-1893nm, and a pulse energy of 0.24–2.36 mJ was also achieved.
A K Podda - One of the best experts on this subject based on the ideXlab platform.
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ultra low noise low cost Octave Band hybrid tuned vco
Canadian Conference on Electrical and Computer Engineering, 2005Co-Authors: Ulrich L Rohde, A K Podda, Reimund RebelAbstract:The application where coarse and fine-tuning is prime requirement, phase noise gets drastically degraded in presence of the fine tuning network if incorporated with a coarse tuning network. A VCO with a frequency that is less sensitive to tuning control voltage fluctuations imparts less phase jitter to the system, but suffers from a narrower tuning range, thereby it is limited by tuning Band. This paper describes the unique approach of the hybrid tuning capability of the Octave-Band VCO (1000-2000 MHz/2000-4000 MHz) without sacrificing the phase noise and the tuning range. The design is based on innovative topology, which supports the fast convergence by using coarse-tuning and fine adjustments, by fine-tuning network. The measured phase noise is better than -103 dBc/Hz @ 10 kHz offset for the frequency Band 1000-2000 MHz
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ultra low noise low cost multi Octave Band vco
IEEE Sarnoff Symposium, 2005Co-Authors: Ulrich L Rohde, A K PoddaAbstract:Modern communication systems are multi-Band and multi-mode, therefore requiring an ultra wideBand low noise signal source that may allow accessing simultaneously DCS1800, PCS 1900, and WCDMA networks by a single ultra low noise wideBand VCO. An ultra low noise, low cost and power efficient VCO is reported that can be tuned over a fairly wide range of frequencies (500-2500 MHz) while maintaining low phase noise (-132 dBc/Hz @100 kHz offset) over the Band. The coupled distributed resonator design approach demonstrated can satisfy the need for the present demand for multi-Octave-Band VCOs, and is amenable for integration in chip form
Ulrich L Rohde - One of the best experts on this subject based on the ideXlab platform.
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ultra low noise low cost Octave Band hybrid tuned vco
Canadian Conference on Electrical and Computer Engineering, 2005Co-Authors: Ulrich L Rohde, A K Podda, Reimund RebelAbstract:The application where coarse and fine-tuning is prime requirement, phase noise gets drastically degraded in presence of the fine tuning network if incorporated with a coarse tuning network. A VCO with a frequency that is less sensitive to tuning control voltage fluctuations imparts less phase jitter to the system, but suffers from a narrower tuning range, thereby it is limited by tuning Band. This paper describes the unique approach of the hybrid tuning capability of the Octave-Band VCO (1000-2000 MHz/2000-4000 MHz) without sacrificing the phase noise and the tuning range. The design is based on innovative topology, which supports the fast convergence by using coarse-tuning and fine adjustments, by fine-tuning network. The measured phase noise is better than -103 dBc/Hz @ 10 kHz offset for the frequency Band 1000-2000 MHz
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ultra low noise low cost multi Octave Band vco
IEEE Sarnoff Symposium, 2005Co-Authors: Ulrich L Rohde, A K PoddaAbstract:Modern communication systems are multi-Band and multi-mode, therefore requiring an ultra wideBand low noise signal source that may allow accessing simultaneously DCS1800, PCS 1900, and WCDMA networks by a single ultra low noise wideBand VCO. An ultra low noise, low cost and power efficient VCO is reported that can be tuned over a fairly wide range of frequencies (500-2500 MHz) while maintaining low phase noise (-132 dBc/Hz @100 kHz offset) over the Band. The coupled distributed resonator design approach demonstrated can satisfy the need for the present demand for multi-Octave-Band VCOs, and is amenable for integration in chip form
Aizitiaili Abulikemu - One of the best experts on this subject based on the ideXlab platform.
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Octave Band tunable optical vortex parametric oscillator
Optics Express, 2016Co-Authors: Aizitiaili Abulikemu, Taximaiti Yusufu, Roukuya Mamuti, Shungo Araki, Katsuhiko Miyamoto, Takashige OmatsuAbstract:We developed an Octave-Band tunable optical vortex laser based on a 532 nm optical vortex pumped optical parametric oscillator with a simple linear-cavity configuration by employing cascaded non-critical phase-matching LiB3O5 crystals. The optical vortex output was tunable from 735 to 1903 nm. For a pump energy of 9 mJ, an optical vortex pulse energy of 0.24-2.36 mJ was obtained, corresponding to an optical-optical efficiency of 0.3-26%.
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Octave Band tunable 0 74 1 89μm optical vortex laser
Conference on Lasers and Electro-Optics, 2016Co-Authors: Aizitiaili Abulikemu, Taximaiti Yusufu, Roukuya Mamuti, Katsuhiko Miyamoto, Takashige OmatsuAbstract:We developed an Octave-Band tunable optical vortex laser based on a 0.532-μm optical vortex-pumped optical parametric oscillator with an extended cavity configuration by employing cascaded non-critical phase-matching LiB 3 O 5 crystals. The optical vortex output was tuned within a wavelength range of 735nm-1893nm, and a pulse energy of 0.24–2.36 mJ was also achieved.
