Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 15 of 15 for “"Tunable Filter"”.
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Design and application of near infrared tunable filter for ATST and NST
… sections: a general design of the Near Infrared Tunable Filter (NIRTF) of Advanced Technology Solar Telescope (ATST) project and the Near Infrared Imaging Magnetograph (IRIM) of the New Solar Telescope (NST), the design of achromatic waveplates, the narrowband continuum observation of a Sunspot …
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Linearized 4-7 GHz LC Tunable Filter with Active Balun in 0.18um SiGe BiCMOS
… important parameters. Prior work has shown tunable LC filters to be advantageous in the microwave regime. A balanced-to-unbalanced (balun) transformation circuit is required to support the differential nature of a tunable LC filter. An active balun that also performs as a transconductor to …
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Monolithic In-Plane Tunable Optical Filter
… System (MEMS) monolithic in-plane tunable optical filter in both Indium Phosphide and Silicon. By placing one mirror of a waveguide-based Fabry-Perot interferometer on an electrostatically-actuated beam, a tunable filter is constructed. This is the first demonstration of a …
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Development of Tunable Optical Filters for Interrogation of White-Light Interferometric Sensors
… strategy to be used. In this Ph.D. research, a tunable optical filter based WLI (TOF-WLI) is proposed and validated as a low cost, yet high performance, solution to the interrogation of various types of interferometric sensors. In addition to the capability of linear/quadrature demodulation, …
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Advanced Prototypes of the Aerosol Limb Imager
… instrument pairs an extended range acousto-optic tunable filter with a liquid crystal polarization rotator to capture spectrally resolved polarimetric imagery of the atmospheric limb. These technologies provide the capability to extract particle size information from the sampled radiance and to …
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Testing a novel method to map the 3D distribution of gas clouds in intergalactic space
… were carried out with the Maryland-Magellan Tunable Filter (MMTF) at central wavelengths of 5120A and 5140A and pointing to the Chandra Deep field South. The broadband images were obtained through the European Southern Observatory public database. Catalogues of galaxies were constructed from …
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Design of New, Compact and Efficient Microstrip Filters for 5G Wireless Communications
… decades. New, compact and efficient passband filters with multi-functions and good performance are highly demanded in current and future wireless systems. This has also driven considerable technological advances in reconfigurable/tunable filter and filtering antenna designs. In light of this …
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Design of New, Compact and Efficient Microstrip Filters for 5G Wireless Communications
… decades. New, compact and efficient passband filters with multi-functions and good performance are highly demanded in current and future wireless systems. This has also driven considerable technological advances in reconfigurable/tunable filter and filtering antenna designs. In light of this …
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Compensation technique for nonlinear distortion in RF circuits for multi-standard wireless systems
… such as power amplifiers, reconfigurable and tunable filters and modulators, these interfering signals produce nonlinear distortion products which can deform the output signal considerably. Hence it becomes necessary to block these interfering signals using special components. The main …
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Investigation of Narrowband Acousto-Optic Tunable Filters for Semiconductor Laser Tuning
Wavelength tunable sources find applications in areas of laser surgery, optical coherence tomography, material processing, and differential absorption light detection and ranging. Acousto-optic tunable filters (AOTFs) are wavelength selective devices which allow for better stability than mechanical …
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Analysis of a composite dielectric-ferrite loaded resonator using the transmission line model with application to a tunable dual mode bandpass filter
A magnetically tuned filter is presented in this dissertation. Filter tuning of a dielectric ceramic resonator is accomplished using by using two oppositely biased ferrites. Specifically, a change in the applied magnetic field is used to alter the permeability of the ferrite so as to achieve …
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Reconfigurable RF front end: A mixer-first architecture and tunable filters
… a mixer-first receiver system and an on-chip tunable bandpass filter, are reviewed and verified. For the mixer-first receiver, a pure passive mixer called distributedly modulated capacitor (DMC) is introduced and analyzed, then simulation in ADS is reported, the results of which prove the …
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Integrated Tunable LC Higher-Order Microwave Filters for Interference Mitigation
… in the increasingly hostile RF environment, filtering becomes a bottleneck for SDRs as the traditional off-chip filters are fixed frequency and bulky. Therefore, tunable filtering is a critical building block for the reconfigurable RF front-ends and on-chip implementations are needed to meet …
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Light as a universal tool : Microcapsule sizing by elastic light scattering and mineral investigation by in situ Raman spectroscopy
… the laser unit, the Raman head, the Rayleigh filtering box, and the spectral sensor (spectrometer with a matching de-tector) are described. The two proposed designs, one based on an acousto-optic tunable filter (AOTF) and the other based on a dispersive hadamard transform spectrometer are …
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Delivery of Myoglobin Polymersomes Results in Tumor Hemorrhagic Necrosis and Enhanced Radiation Response
… for vessel morphology and blood flow, and a tunable filter was used for determining hemoglobin (Hb) oxygen saturation. Tumor hemorrhaging was observed within hours of PEM treatment, which was not seen with empty polymersomes. This was consistent with the gross tumor effects observed …