Optics: measuring and testing – By dispersed light spectroscopy – With sample excitation
Patent
1984-12-18
1987-02-24
Evans, F. L.
Optics: measuring and testing
By dispersed light spectroscopy
With sample excitation
356307, G01N 2163
Patent
active
046453423
ABSTRACT:
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.times.10.sup.9 W/mm.sup.2 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.
REFERENCES:
patent: 3669546 (1972-06-01), Virloget
patent: 4182574 (1980-01-01), Quillfeldt
patent: 4191475 (1980-03-01), Sourrouille
Adrain et al., Conference: Electro-Optical Laser International, Brighton, England, Mar. 25-27, 1980, p. 375.
Watson et al., J. Phys. E., vol. 10, No. 12, Dec. 1977, p. 1227.
Gibson et al., J. Phys. D.: Appl. Phys, vol. 4, No. 10, 1971, p. 1527.
Tanimoto Wataru
Tsunoyama Kouzou
Evans F. L.
Harringa Joel L.
Kawasaki Steel Corp.
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