KEYWORDS: Light sources and illumination, Lamps, Black bodies, Light, Color vision, Reflectivity, Colorimetry, CIE 1931 color space, Color reproduction, Absorption
This work is intended to deal with the problems which arise when illuminanting Paleolithic cave paintings. We have
carried out the spectral and colorimetric characterization of some paintings located in the Murcielagos (bats) cave
(Zuheros, Córdoba, Spain). From this characterization, the chromatic changes produced under different lighting
conditions are analysed. The damage function is also computed for the different illuminants used. From the results
obtained, it is proposed an illuminant whose spectral distribution diminishes the damage by minimizing the absorption of
radiation and optimises the color perception of the paintings in this cave. The procedure followed in this study can be
applied to optimise the lighting systems used when illuminating any other art work
The miniaturization of light detectors in the visible and infrared has produced devices with micrometric and sub-micrometric spatial features. Some of these spatial features are closely linked with the physical mechanism of detection. An example of these devices is an optical antennas. To spatially characterize optical antennas it is necessary to scan a probe beam on the plane of the optical antenna. The mapping of this response is then treated and analyzed. When the response of the antenna is monitorized at visible or near-infrared frequencies, a sub-micron scanning step is necessary. In this paper we show the experimental set-up of a measurement station having a spatial resolution of 50 nanometers. This station is devoted to spatially characterize micrometric detectors, and specially optical antennas. The origin of the uncertainties of the measurement protocol is shown and practically analyzed. This station is also applied for characterizing the temporal, spectral, and polarization sensitivity specifications of light detectors with the previously mentioned resolution.
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