Photostability Test

Abstract: A flexible near-infrared (NIR) absorption filter well suited for use as a front surface filter for night vision imaging system (NVIS) LED displays was prepared by using a transparent polymer film and acrylic resin as substrate, NIR-dyes NIR787 and NIR860 as functional additives through the solvent mixing method. In particular, this new dye-based NVIS filter material offers sharp spectral cut-off and excellent extinction in the NIR (665–930 nm) along with an appropriate transmittance in the visible spectrum (400–700 nm). The optical performance of the filter was studied, the optimal dosage of NIR787 and NIR860 was determined and the results showed there was a good linear relationship between amount of NIR-dyes and light transmittance. In addition, the filter kept good environmental stability after cyclic humid heat test, high temperature aging test, low temperature aging test and photostability test.

Abstract: A range of novel biomass-derived sunscreens and additives were synthesized by substituting corn-produced isosorbide with different functional moieties, such as naturally-occurring cinnamic acids. Based on the different reactivity of the two isosorbide hydroxyl groups, an effective synthetic route was developed for making multifunctional molecules such as UV-absorbing polymer plasticizers and antioxidants. Isosorbide-derived UVB/UVA sunscreens and other additives were characterized by NMR, FTIR and UV spectra. A UV photostability test showed that such sunscreens not only have a high molar extinction coefficient but also a high photostability, the combination covering both UVB and UVA regions. By following this scheme, other medically-useful bio-molecules can be synthesized in the future, such as a full spectrum UV absorber and a UV-absorbing antioxidant, to name a few.

Abstract: A plurality of fluorescent lamps 30 are in a decentered layout so as to be placed in a peripheral part of an upper space of an environmental test chamber 11 above a sample loading surface 21. The irradiance distribution of light from the fluorescent lamps 30 over the sample loading surface 21 is in the range of ±25% relative to the irradiance at the center of the sample loading surface 21.