Optical element for automatically darkening welding filters

Edward Nowinowski-Kruszelnicki

doi:10.1117/12.300038

1 February 1998 Optical element for automatically darkening welding filters

Edward Nowinowski-Kruszelnicki

Proceedings Volume 3318, Liquid Crystals: Physics, Technology, and Applications; (1998) https://doi.org/10.1117/12.300038
Event: Liquid Crystals, 1997, Zakopane, Poland

Abstract

The goal of this paper is to present the construction and performance data of the optical shutter developed for automatical soft gate for face shield during the welding process. High level of radiation protection combining both a fast response time and a low transmittance in a wide viewing cone were the main requirements of the device. To find applications it was critical to minimize driving power consumption because of solar cells charging of battery supply. By positioning two identical 6 micrometers liquid-crystal cells with (Delta) nd equals 0.48 between three linear polarizes with crossed rubbing directions at neighbor substrates and application of high purity liquid mixture with dielectric constant values e (parallel) equals 6.38 and e (perpendicular) equals 3.1, respectively, fast response, low transmission and low power consumption of the optical element have been obtained.

Citation Download Citation

Edward Nowinowski-Kruszelnicki "Optical element for automatically darkening welding filters", Proc. SPIE 3318, Liquid Crystals: Physics, Technology, and Applications, (1 February 1998); https://doi.org/10.1117/12.300038

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