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 20 of 26 for “"Optical Filter"”.
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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 waveguide-coupled …
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Low radiation loss, broadband distribution feedback optical filter
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2003.
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Long-term analysis of a small-scale concentrated photovoltaic-thermal system with a nanoparticle-based optical filter
… (CPV-T) system that uses nanofluid-based optical filters, which can generate electricity and absorb heat from sunlight. Although spectral filtering CPV-T systems have been explored in the literature for power generation, they have not been investigated for domestic applications. In this …
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Material Related Effects on the Structural Thermal Optical Performance of a Thermally Tunable Narrowband Interferometric Spectral Filter
… is a backscatter lidar technique that employs an optical/spectral filter to distinguish between particulate (Mie) and molecular (Rayleigh) backscattered light. By separating the two types of returns, higher accuracy measurements are possible that will enable improved climate models, air quality …
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Development of Tunable Optical Filters for Interrogation of White-Light Interferometric Sensors
… 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, TOF-WLI …
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ALL-OPTICAL DELTA-SIGMA MODULATOR DESIGN AND IMPLEMENTATION
… research an approach to design and implement all-optical delta-sigma modulator (ODSM) has been expanded. The two main blocks of this modulator are “leaky integrator” and “bi-stable switch” designed and implemented by using active element like semiconductor optical amplifier (SOA) and other passive …
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Compact Optical Sensing Systems for pH and Other Substances Detection - Theory and Implementation
… is of importance in research and industry. Optical sensors based on contact imaging realize the chemical detection in compact, efficient and inexpensive ways. In the first project real-time optical pH sensor based on complementary metal–oxide–semiconductor (CMOS) contact imaging and …
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Linear-cavity tunable fibre lasers employing an Opto-VLSI processor and a MEMS-based device
… and the MEMS-based device along with an optical collimator, a Bragg grating plate and an optical lens, enable the realisation of an optical filter for continuous tuning of wavelengths over the amplified spontaneous emission (ASE) range of the EDF. We also propose the use of a section of …
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Development of a flexible image-based approach for studying signal transduction in isolated arterioles
… used in the project required specific optical filter units and development of a. custom built optical system. Using the system, FRET was demonstrated, as was the ability to detect changes in fluorescence signal to known depolarizing stimuli. The developed system is now ready for …
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Long-range outdoor monocular localization with active features for ship air wake measurement
… active LED features and a bandpass-interference optical filter, to significantly simplify the image processing step of the Perspective-n-Point (PnP) problem. The PnP problem describes the calculation of pose from n extracted image points corresponding to n known 3D world points. The proposed …
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Opto-VLSI based WDM multifunction device
… has made the development of high-bandwidth optical net-works a focus of research interest. The implementation of Dense-Wavelength Division Multiplexing (DWDM) optical fiber transmission systems has the potential to meet this demand. However, crucial components of DWDM networks – add/drop …
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On-chip silicon based photonic structures : photonic band gap and quasi-photonic band gap materials
… Secondly, we developed a Si-based multi-channel optical filter with tunability, which is based on omnidirectional reflecting photonic band gap structure with a relatively large air gap defect. Using only one device, multi channel filter with tunability around two telecom wavelength 1.55[mu]m and …
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Expanding the Reach of Quantum Enhanced Gravitational-Wave Detectors
… 2000s, Kimble et. al. [1] proposed the use of optical filter cavities to prepare frequency dependent squeezed states which circumvent measurement back-action by suppressing radiation pressure noise at low frequencies while continuing to reduce shot noise across the rest of the gravitational …
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Development of in vivo Raman spectroscopy of atherosclerosis
… has been prohibited by the lack of optical fiber probes which can provide remote access to small diameter vessels. To this end, we have developed a new spectroscopic model and a novel Raman probe. The model interprets Raman spectra of intact tissue in terms of its morphology. The …
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Observational Investigations of the Progenitors of Supernovae
… of a core-collapse SN, which relies on only two optical filter observations – this will hugely reduce the observational cost of constructing bolometric light curves, a tool of great importance when hoping to constrain the nature of a SN explosion and hence its progenitor. Finally, this method is …
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Development of experimental and instrumental systems to study biological systems
… of a spatial light modulator as a programmable optical filter that can be programmed with filters based on multivariate signal processing algorithms, such as PLS, in order to rapidly detect chemical components and create chemical maps. Chapters 5-8 of this thesis describe the development and …
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On a dual wavelength optical sensor system for measuring strain and temperature simultaneously in tokamak port plug
… electromagnetic and radiation effects. An optical fibre sensor was constructed to a strain resolution of ±10uε and temperature resolution of ±5°C. The fibre sensor is an off the shelf solution dual-wavelength fibre Bragg grating. The thesis proposes a method of coating the fibre in layers …
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Characterisation and optimisation of novel Sol-Gel materials for luminescence-based 02 sensing
… important drivers for materials to be used in optical chemical sensors. In recent years, there has been a focus on sol-gel materials for sensor applications due to their excellent optical properties, ease of entrapment of analyte-sensitive dyes and the compatibility of the sol-gel process with …
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Multimaterial acoustic fibers
… of solid materials with disparate electrical, optical, and mechanical properties into a single fiber presents new opportunities for extending fiber applications well beyond optical transmission. Fiber reflectors, thermal detectors, photodetectors, chemical sensors, surface-emitting fiber …
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Full spectrum utilization for high-efficiency solar energy conversion
… emitter with a tandem plasma-interference optical filter. We measured a solar-to-electrical conversion rate of 6.8%, exceeding the performance of the photovoltaic cell alone. Additionally, we show experimentally that STPVs can reduce the heat generation rates in the photovoltaic cell by a …
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