Induced plasma generator and its method

Abstract

Abstract PURPOSE: To improve the reliability of ignition and maintain stable and correct plasma discharge by relatively moving a torch tube with a plasma-forming gas reflux part, a sample material jet part, etc., relative to a plasma gas energizing induction coil for alignment. CONSTITUTION: A tubular touch member 12 which has a plasma gas reflux 20, formed with a tubular middle member 18 and a small-bore tube 16 concentric therewith for the plasma gas to flow from a plasma-forming gas source 40 through a gas conduit 38, a carrier gas source 48, formed by a tube 16 and a sample material jet portion to jet sample material from a sample container 50 is axially moved via rack teeth 72 and a pinion 74. After it is energized by a plasma gas energizing coil 14 concentric with the member 12 to generate plasma with plasma gas, the end of the tube 16 is aligned from a position vertical with respect to an axis at the rear end of the coil 14 to a position vertical against an axis at the front end. As a result, plasma is well ignited, the reliability of the ignition is improved, plasma discharge after ignition is maintained stably and correctly and sample is well ionized. COPYRIGHT: (C)1989,JPO

Inventors

• 👤 Peter J Morrisroe
• 👤 Andrew T Zander
• 👤 David C Manning
• 👤 Peter H Gagne

Bibliographic Details