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 52 for “"illuminance"”.
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Matters of Illuminance - Transforming Light into Material Artifacts
This research explores a process to transform light into physical artifacts. It develops a series of custom software systems to capture images of sunlight moving through a building and transform them into three-dimensional forms. It uses digital manufacturing methods to create the three-dimensional …
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The design and implementation of a smartphone illuminance meter
… efforts to build a robust, smartphone-based illuminance meter application, and describes its prototype implementation. Though hardware and software constraints prevent the complete development of such a prototype, its use and potential are demonstrated.
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The Effect of interocular Difference of Retinal Illuminance on Streopsis
… dtheeffectofinducedinteroculardifferenceofretinal illuminanceon stereopsisunderbinocularcycloplegiatoeliminatethechange of pupilsizeandaccommodation. METHODS: Fifty adultswho havebestcorrected visualacuity 1.0 orbetter and normalbinocularity were examined with neutraldensity filters under …
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An investigation of stereopsis with AN/AVS-6 night vision goggles at varying levels of illuminance and contrast
The increased reliance on night operations by the military over the last few decades has led to the development of various night imaging devices. Night vision goggles (NVGs) are one device which have gained widespread use in nighttime helicopter operations. However, rotorcraft accident data have …
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Effects of illuminance, luminance, viewing angle, and screen test pattern on the perception of flicker in CRT displays
… purpose of this research was to determine how illuminance, luminance, screen test pattern, and viewing angle affect the perception of flicker in a CRT, especially in relation to the flicker evaluation method in the ANSI/HFS 100-1988 standard. Twenty participants viewed a CRT at different …
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Optimal element size-shape-spacing combinations for a 5 X 7 dot matrix visual display under high and low ambient illuminance
… size ratio combinations at high and low ambient illuminance levels was used to determine optimal combinations for a 5 X 7 dot matrix visual display. Three tasks - a reading test, a random search task, and a structured (menu) search task - were used to enhance the utility of the research. All …
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A methodology for detailed calculation of illuminance levels and light dimming factors in a room with motorized blinds integrated in an advanced window
… incidence angle and sky conditions. (2) The illuminance distribution on the work plane due to daylight is determined. (3) The electrical light level required to achieve the necessary total illuminance level on the work plane is computed and light dimming levels are established. (4) Energy …
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Time-varied daylighting performance to enable a goal-driven design process
… on the same terms with spatial quantities like illuminance. This thesis demonstrates methods for quickly calculating annual data sets for which temporal maps are the intended display format. Metrics are then developed in order to display goal-based performance information for an entire area of …
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Smart Prismatic Louver Technology for Enhanced Daylighting and Management of Thermal Loads in Green Buildings
… prisms. Daylighting performance was evaluated by illuminance measurements at key locations within the space, whereas thermal harvesting performance was evaluated through water temperature measurements and thermal imaging analysis of the system during operation. We show that the LFPL system …
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A study of mechanisms for discomfort glare
… corresponding mechanisms. We measured retinal illuminance levels for discomfort glare at threshold as a function of source size, eccentricity and surrounding background luminance. In addition, the pupil size was measured throughout and related to the measured thresholds for discomfort glare. A …
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Factors affecting color appearance and measurement by psychophysical methods
… color temperature, luminance factor, and illuminance of surface color stimuli. Saturation, or colorfulness, is most susceptible to change and is highly dependent upon luminance factor and illuminance in addition to color temperature. These dependencies are systematic and explicit in the …
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Optimizing Lighting Conditions for Nighttime Highway Construction Operations
… in the CONLIGHT model to calculate average illuminance, lighting uniformity, glare, and cost. The model can be utilized to verify that the selected lighting arrangement complies with all lighting design requirements. Third, a decision support system is developed utilizing the CONLIGHT model …
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CRT anti-glare treatments, image quality, and human performance
… a wide range of filter transmissions and diffuse illuminance on measured image quality and the same user measures as in Phase I. Phase I showed that while none of the glare filters yielded improved readability or legibility over a baseline condition, the etched and low transmission filters were …
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Illuminating education : composition and use of lighting in public K-12 classrooms
… architectural design of schools. An analysis of illuminance and color temperature measurements across 21 classrooms, observations, and questionnaire responses from 27 teachers reveals muted daylight availability and low and warm color electric lighting conditions in the classroom that …
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Daylight modeling for energy efficiency and visual comfort in buildings
… first step in determining the indoor building illuminance lies in knowing the outdoor illuminance. This dissertation addresses this key aspect through different strategies such as luminous efficacy models and the determination of the angular distribution of the sky's luminance. Daylight is …
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Daylight and planning in Europe
… relationship between the global horizontal illuminance and the total vertical illuminance when the facade is not receiving direct sunlight. Further studies carried out with computer simulations with RADIANCE as well as analytical calculations confirmed this relationship, which is shown to be …
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Effects of Intersection Lighting Design on Driver Visual Performance, Perceived Visibility, and Glare
… The second goal was to determine the effect of illuminance on visual performance at intersections. The third goal was to understand the relationships between object luminance, contrast, and visibility. To achieve these goals, three specific configurations were used, that illuminated the …
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Decision-Making Framework for the Selection and Design of Shading Devices
… the general DMF. The specific DMF, based on illuminance and luminance, is used for an analysis of daylighting performance of shading devices to select the best possible existing system or new system among several alternatives. Architects or manufacturers of shading devices, as the users of …
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Multi-spectral light interaction modeling and imaging of skin lesions
… method (ADWAT) is proposed to classify epi-illuminance images of the skin lesions obtained using a white light source into melanoma and dysplastic nevus images classes. In this method, tree-structure models of melanoma and dysplastic nevus are developed and semantically compared with the …
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