No abstract

In order to easily obtain data of directional reflection characteristics to be incorporated into the simulation, we considered to identify feature quantity of mathematical models of directional reflection characteristics by using information obtained by employing simplified measurements. We compared detailed data of directional reflection characteristics, which were obtained by the direct measurement method utilizing polarizers in advance, with physical properties such as glossiness, surface roughness and spectral diffuse reflectance measured by using commercially available instruments. From these, it was shown that the relevance of the data to expand the possibility of the simplified estimation methods.

Spectral calculation is required in the design of high-quality lighting environments. Therefore, we showed the measurement results of the spectral directional reflection characteristics of building materials, and modeled them mathematically, which are the necessary input data for the spectral calculation. It was a heavy load to handle a huge amount of data for each wavelength obtained by spectral radiance measurement. Thus, we proposed a simplified method to estimate the spectral directional reflection characteristics of building materials by a simplified method to measure the overall directional reflection characteristics was extended to spectral measurements.

Highly accurate luminance simulation methods are required to appropriately predict and design various lighting environments. In this study, reflected light from building materials such as PVC floorings, PVC sheets, granite and resin coated metal plates were measured by being separated into the boundary reflection component and the layer reflection component using a polarizer. From the measurement, we obtained a dataset of directional reflection characteristics to be incorporated into luminance simulations. Moreover, the spectral reflection characteristics of the boundary reflection component and the layer reflection component were also measured, and their features were examined.

For the saving energy of the illumination, it is necessary to use day light effectively. In general, office has only side window to get day light and Venetian blinds are installed in the window for solar shading. In the automatic blind control system installed at the large scale building, slats of blind are uniformly controlled by illuminance censor fixed on the top of the building. We devised technique to detect not only the direct sunlight but also the dazzling borrowed light from adjacency building based on a luminance image provided with a CCD camera for the purpose of the development of the higher precise judgment of solar shading. We built the system which could perform shading immediately at the time of the detection and introduced it into the actual work place. Here, we report a detection method and an experimental data of the precision of the system.