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1. 1. The optical properties of automatically darkening welding filters based on liquid crystal technology

   Författare :Stephen Palmer; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; Fysik; Physics; Fysik; Solid State Physics; fasta tillståndets fysik;

   Sammanfattning : This thesis addresses the problem of the poor optical angular properties displayed by automatically darkening welding filters that are based on liquid crystal technology. It is shown that by reducing thetwist-angle present in the liquid crystal cell to below that of 90° together with employment of a novel polariser arrangement, an optical shutter design using a double-cell construction is obtained thatpossesses a reduced angular transmittance variation when in the activated phase. LÄS MER