| 摘要 |
PURPOSE:To shorten a light passage from an opening part to a spectrum diffraction part, by providing an electric discharge preventing cover on the opening edge of pipe wall for lighting of a waveguide producing a plasma flame by vapor corresponding to a sample composition component conveying through sending gas. CONSTITUTION:The vapor corresponding to a sample composition component which is generated from a sample 7 by irradiating laser light, is conveyed in a quartz torch 13 penentrating a waveguide 11 through carrier gas from a feeding part 5. Then, a plasma flame 12 of produced gas is formed by microwave energy of the waveguide 11 and radiated light by the plasma flame 12 is received at a light diffaction part 18 facing to an opening 15 of the waveguide 11 each other. The edge part of the opening 15 is covered by an insulating material 14 such as ''Teflon '' and the generation of electric discharge is prevented. Accordingly, a light passage from the opening 15 to the part 18 can be shortened and mixing of interferring light is not generated and then, a highly sensitive and accurate spectroscopic analysis is made by decrease of background due to surrouding light. |
