METHOD OF LASER EMISSION SPECTROSCOPIC ANALYSIS OF STEEL AND APPARATUS THEREFOR

摘要

When a light emitted during the irradiation by a laser beam onto the surface of steel is spectrally separated and elements contained in the steel are analyzed quantitatively: an infrared pulse laser beam irradiates a sample such that an energy density on the surface of the sample becomes 2.0 x 109 W/mm2 or more, so that a satisfactory emission spectrum can be obtained; a light emitted from the surface of the sample is received through a path held under an atmosphere of inert gas by a light introducing system at a solid angle of 16 degrees or more, and thereafter, caused to form its image at an inlet slit of a spectroscope so that an emission spectrum intensity being low in variations can be obtained for a long period of time; and out of light emitted from the surface of the sample immediately after the irradiation by the laser beam, a firstly emitted light generating white noise is excluded and a subsequently emitted light is quantitatively analyzed, so that the accuracy of analysis can be improved with the influence of the white noise being avoided.