Giant Pulse Laser Spectrochemical Analysis of C, Si, and Mn in Solid Steel

A method of spectrochemical analysis by means of G. P. (giant pulse) laser has been applied to the analysis of C, Si, and Mn in solid steel and the most suitable condition for its application has been studied. The following results have been obtained:(1) In atmosphere for the analysis, Ar or Ar+3%H2 is better than N2 and air from the point of view of spectral intensity and SN ratio.(2) As a result of examination of the influence of laser energy on spectral intensity and intensity ratio, it has been found that it is generally suitable to set up laser energy above 0.3J. And for the purpose of minimization in variations of each analysis, intensity ratio to Fell 271.4nm should be used.(3) Calibration curves have been made under the most suitable condition described above, and its relative errors of analysis have been evaluated.(4) As a result of the time profile studies of the spectral lines obtained in Ar atmosphere, it has been shown that the separation of line and background is possible, and so that SN ratio of the analysis is much improved by this technique.