G - Physics – 01 – N
Patent
G - Physics
01
N
183/19, 73/55, 7
G01N 21/73 (2006.01) G01J 1/16 (2006.01) G01N 21/25 (2006.01) G01J 3/32 (2006.01) G01J 3/36 (2006.01) G01N 30/74 (2006.01)
Patent
CA 2016272
19 ABSTRACT OF THE DISCLOSURE A method of correcting for background changes in a plasma emission detector comprising a photodetector array is disclosed. In the photodetector array a plurality of sensors are used to detect the emission lines from a discrete number of selected elements including carbon. It is shown that, to the first order, there is a correlation between the response at detectors other than the carbon detector with the response at a carbon detector. The exact extent of this correlation is highly dependent on the amount of nitrogen present in the carrier gas used in the system. A calibration curve can be generated which allows compensation at a frequency of interest as a function of the magnitude of the carbon signal. This curve will depend on the level of nitrogen in the carrier gas and can be empirically determined each time a new bottle of gas is connected to the system. In a preferred embodiment, the calibration curve is not referred to until the carbon response reaches a preselected threshold value corresponding to the point on the calibration curve where there is a measurable spurious reading. 89-20
Bolton Barbara Ann
Wells Gregory James
R. William Wray & Associates
Varian Associates Inc.
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