Inductively coupled plasma spectroscopy
AssigneeVarian Associates, Inc.
InventorIan L. Turner
Life of this patent
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Abstract
In inductively coupled plasma spectroscopy, the use of an induction coil assembly comprising at least two helical coils which are arranged in overlapping relationship. In one practical form, the overlap is achieved by interlacing of the coils so that at least one turn of one coil is interposed between two adjacent turns of the other coil. For that purpose, the two coils will ideally be of the same diameter and will be coaxial. A tubular part of a plasma torch is contained within the space surrounded by the coil assembly, and a RF energy source is connected to an end of each coil. The other ends of the coils may be connected to ground.
Claims22
An induction coil assembly for use in an inductively coupled plasma spectrometer, including at least two helical coils which are relatively arranged so as to be in at least partial overlap, one end of each said coil being connectable to a high frequency energy source, and the other end of each said coil being connectable to ground.
A plasma torch assembly including a tube for containing the plasma, at least two helical induction coils surrounding said tube, said coils being in at least partially overlapping relationship, one end of each said coil being connectable to a high frequency source, each said one end being at a respective opposite end of the assembly formed by said coils, and the other end of each said coil being connectable to ground.
An induction coil assembly for use in an inductively coupled plasma spectrometer, including at least two helical coils which are relatively arranged so that at least part of at least one turn of one said coil overlaps at least part of a turn of the other said coil, one end of each said coil being connectable to a high frequency energy source, each said one end being at a respective opposite end of said assembly, and the other end of each said coil being connectable to ground.
An inductively coupled plasma spectrometer including, a plasma torch, a tube for at least partially containing the plasma, an induction coil assembly surrounding said tube and being operable to sustain the plasma, said assembly being composed in at least two helical coils, each said coil having two ends, at least part of at least one turn of one said coil having an overlap with at least part of a turn of the other said coil, one end of each said coil being connectable to a high frequency energy source, the other ends of the respective coils being connected together, and detection means which is operable to detect the presence of a selected element within said plasma.
Dependencies are inferred from the claim text.