“…However, the investment for non-traditional methods is typically high. Cost effective non-traditional methods such as the arc light radiation monitoring which can measure and analyse the intensity of the whole range of the arc light spectrum or intensity of a single emission line (Li P.J., et al, 2001;Wang Q.L., et al, 1997;Yoo C.D., et al, 1997;Ancona A., et al, 2004;Sadek C.A., et al, 2006;Li Z.Y., et al, 2009;Mirapeix J., et al, 2008) are thus desired. This method was first used to determine the length of the arc in the method of MAG in 1966 (Johnson C.A., et al, 1966).…”