Abstract
A new emission spectrometric method in which a spark discharge chamber is linked to a spectrometer by using a fiber-optic light guide has been studied. This report describes the characteristics of various types of fiber-optic light guide for transmission of spark radiation. The analytical system is mainly consisted of spark discharge chamber, power source for spark discharge, Faschen-Runge type spectrometer, 2 to 10m long all silicon types or silicon polymer-clad types of fiber-optic light guide. The loss of transmit-tance by the fiber-optic light guide was investigated by measuring the emission intensities of spectral lines with various wavelength.
The results obtained are summarized as follows: (1) Silicon polymer-clad bundle fiber-optic light guide which has wide numerical aparture and large core area is suitable for transmission of spark radiation, (2) Analytical lines of elements, such as Si, Mn, Cr, Al, Ti, and Cu in Steel, in the range of wavelengths longer than 268nm can be transmitted over a distance of more than 10m and can be determined satisfactorily. However, the transmission of analytical lines of C, P, and S shorter than 268nm is difficult because of the absorption loss by the fiber-optic light guide.
