Method of laser emission spectroscopical analysis of steel and apparatus therefor.

摘要

When a light emitted during the irradiation of 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 (A) irradiates a sample (10) such that an energy density on the surface of the sample (10) becomes 2.0 x 10<Sup>9</Sup> W/mm2 or more, so that a satisfactory emission spectrum can be obtained;

a light (B) emitted from the surface of the sample (10) is received through a path held under an atmosphere of inert gas by a light introducing system at a solid angle (8) of 16 degree or more, and thereafter, caused to form its image at an inlet slit (16A) 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 lights (B) emitted from the surface of the sample (10) immediately after the irradiation of a laser beam (A), a firstly emitted light (B) generating white noises is excluded and a subsequently emitted light (B) is quantitatively analyzed, so that the accuracy of analysis can be improved with the influence of the white noises being avoided.