Radiant energy – Ionic separation or analysis – With sample supply means
Reexamination Certificate
2006-01-24
2006-01-24
Lee, John R. (Department: 2881)
Radiant energy
Ionic separation or analysis
With sample supply means
C356S316000
Reexamination Certificate
active
06989529
ABSTRACT:
A torch for producing an inductively coupled or microwave induced plasma for use in spectrochemical analysis. The torch includes a central tube (25) for conveying a flow of a gas carrying sample aerosol to a plasma (17) produced in the torch. The tube (25) has an inlet (31) and an outlet (39) of smaller size than the inlet and is shaped to deliver a substantially laminar flow of the gas at the outlet (39). The tube (25) is tapered along at least a substantial portion of its length such that its cross-section area gradually and smoothly reduces towards its outlet (39) along at least a substantial portion of its length. It has been found that such a tapered tube is resistant to obstruction by salts deposited from samples containing high levels of dissolved solids.
REFERENCES:
patent: 5818581 (1998-10-01), Kurosawa et al.
Bella Fishman
Berkowitz Edward H.
Gurzo Paul M.
Lee John R.
Varian Australia PTY Ltd.
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