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 11 of 11 for “"Fresnel lens"”.
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Contribución a la teoría de diseño y a la tecnología de las lentes de FresNel para su uso como concentradores en aplicaciones fotovoltaicas
… aspectos relacionados con el empleo de lentes de Fresnel como concentradores fotovoltaicos: Por un lado se analiza un concentrador de una o de dos etapas en el que la primera etapa está constituida por una lente de Fresnel de forma arbitraria (plana, curva, etc.) en el supuesto de que la segunda …
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Building a better flat-field : an instrumental calibration projector for the Large Synoptic Survey Telescope
… radiance of incident light, and of either a Fresnel lens or parabolic mirror to collimate that light. We find that flat-top Engineered Diffusers produce light that is constrained in angle, but which shows persistent pixel-to-pixel non-uniformity at the 5-10% level, and colorto- color …
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Tunable Liquid Crystal Photonic Devices
… (UV) light. An electrically tunable-efficiency Fresnel lens is devised for the first time using nanoscale PDLC. The tunable Fresnel lens is very desirable to eliminate the need of external spatial light modulator. Different gradient profiles are obtained by using different photomasks. The …
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Theory and design of integrated optical isolators and broadband couplers using Fresnel zone plates
… vertical coupler. The structure utilizes a Fresnel lens, or more advanced integrated optics, placed above a short, ridge and deep etched, vertical coupler in a Si waveguide. This optics is placed in order to match the radiating fields to the fiber mode. We use semivectorial simulations with …
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Dynamic Analysis and Seismic Retrofit of the Point Sur Lighthouse
… aid to navigation. The original first-order Fresnel lens was removed from the lantern room and placed in safekeeping due to its high risk of damage in the event of a strong earthquake. The lens has been approved to return to its original setting but the seismic performance of the building …
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Solar thermal collector system modeling and testing for novel solar cooker
… This thesis looked at prior research on glazing, Fresnel lenses, and absorber surface treatments to identify and evaluate elements for use in the collection system. Borosilicate glass, with a thermal conductivity of 1.005 W/mK and a solar transmittance of 0.91, and flat black paint, with …
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Fresnel-focusing and bessel-beam integrated optical phased arrays for optical trapping applications
… patterns in the far field. In this thesis, Fresnel-lens-inspired focusing integrated optical phased arrays are demonstrated for the first time and proposed as a method for chip-based optical trapping. These systems focus radiated light to tightly-confined spots in the near field above the …
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High-Definition Holographic Head-Up Displays
… the equivalent CPU processing time. A virtual Fresnel lens was used to enlarge the driver’s eye box to 25 mm × 36 mm. Real-time scanned road obstacles from different perspectives provide the driver a full view of risk factors such as generated depth in 3D mode and the ability to project any …
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Flat optics based on patterned nanostructures for concentrating light
… are often based on the use of refractive lenses or reflective focusing optics, all of which are either too bulky and cumbersome to be incorporated into portable devices or inconveniently large and heavy to be maintained at a relatively low cost. To achieve development of a planar …
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Chip-scale diffraction phase microscopy
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-05-01
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Cellulose based transition metal nano-composites : structuring and development
… glass vessel, fuelled – with the help of a Fresnel lens – only by direct concentrated sunlight irradiation. This concept carries the thus far presented synthetic procedures from being common laboratory syntheses to a real world application. Based on cellulose, transition metals and simple …