G - Physics – 01 – N
Patent
G - Physics
01
N
73/55, 73/51.5
G01N 21/25 (2006.01) G01N 21/71 (2006.01) G01J 3/36 (2006.01)
Patent
CA 1220643
ABSTRACT OF THE DISCLOSURE: When a light emitted during the irradiation by a laser beam onto the surface of steel is spectrally se- parated 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 satisfac- tory 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 there- after, 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.
470410
Tanimoto Wataru
Tsunoyama Kouzou
Kawasaki Steel Corporation
Robic Robic & Associes/associates
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