title: Application of a photochromic dye in an automatic welding filter.
abstract: The main purposes of this study were to select a photochromic dye and to develop an active welding filter with a photochromic layer. A series of functionalized spirobenzopyranoindolins were synthesized and their photophysical and photochemical properties were investigated in a solution using absorption and emission spectroscopy. Time-resolved fluorescence spectroscopy measurements were used to characterize the decays and rate constants of fluorescence emission. One dye was selected as a suitable photoactive compound in automatic welding filters. A model of an active welding filter with a photochromic layer based on 1',3',3'-trimethyl-6-nitrospiro[2H-1-benzopyran-2,2'-indole] (6-nitroBIPS) was developed. The paper presents the results of tests of the filter conducted according to EN standards.
authors.affiliation: Central Institute for Labour Protection - National Research Institute (CIOP-PIB), Łódź, Poland. adpos@ciop.lodz.pl
authors.forename: Adam
authors.initials: A
authors.lastname: Pościk
authors.forename: Barbara
authors.initials: B
authors.lastname: Wandelt
mesh_terms: D001578:Benzopyrans / Q000138:chemical synthesis*; D016009:Chi-Square Distribution; D004396:Coloring Agents / Q000138:chemical synthesis*; D005374:Filtration / Q000295:instrumentation*; D006801:Humans; D007211:Indoles / Q000138:chemical synthesis*; D007259:Infrared Rays; D049408:Luminescent Agents / Q000138:chemical synthesis*; D015394:Molecular Structure; D009574:Nitro Compounds / Q000138:chemical synthesis*; D016273:Occupational Exposure / Q000517:prevention & control*; D011481:Protective Clothing / Q000592:standards*; D011835:Radiation Protection / Q000295:instrumentation*; D013050:Spectrometry, Fluorescence; D013057:Spectrum Analysis / Q000379:methods*; D014466:Ultraviolet Rays; D014896:Welding
chemical_list: D001578:Benzopyrans; D004396:Coloring Agents; D007211:Indoles; D049408:Luminescent Agents; D009574:Nitro Compounds; C088184:spiropyran