Hydrogen concentration detection in weld arc plasma

摘要: An optical input apparatus (10) for use with a weld evaluation monitor (14) to determine the concentration of hydrogen in arc atmosphere (62) including plasma and shield gas is disclosed as an fiber bundle (16) having single (18) plurality outputs (22). The disposed receive, at its input, electromagnetic radiation emitted from and, because has individual path distribution that completely randomized, communicate proportional amount each independent angular disposition bundle. Radiation only specific wavelengths hydrogen, background emissions are allowed pass through respective line filters (56) associated transducers (58), which generate electrical output signals amplitudes representative intensities emissions. Also signal processing module (12) receiving determining therefrom atmosphere. A method using also disclosed.