SPECTRAL ANALYTICAL METHOD BY LASER EMISSION USING TWO STEP EXCITATION METHOD

摘要

PURPOSE: To provide the title device utilized in the element concentration analysis of a solid or molten metal. ;CONSTITUTION: In a laser emission spectral analyzer, a laser beam from a laser oscillator 1 is convergently emitted on a surface of a sample S, the luminous intensity from plasma 4 formed is measured by a spectroscope 7, and the concentration of a target element is analyzed, by a previously given calibration curve in an analyzer 8. A laser oscillator 9 for excitation is added to the laser emission spectral analyzer, and the laser beam EL for excitation thereof is emitted on the plasma 4 through a prism 10. Thus, in analyzing with the two step excitation method in which the plasma 4 is excited at two steps, the deflection intensity of the laser beam EL passed through the plasma 4 is measured by using a laser beam detector 12. The prism 10 is controlled according to the deflection intensity through an operation controller 14, thereby the positioning of the laser beam EL within the plasma is carried out, and the element analysis can be very accurately done.;COPYRIGHT: (C)1994,JPO&Japio