Electricity: measuring and testing – Using ionization effects – For analysis of gas – vapor – or particles of matter
Reexamination Certificate
2005-01-11
2005-01-11
Le, N. (Department: 2858)
Electricity: measuring and testing
Using ionization effects
For analysis of gas, vapor, or particles of matter
C324S071100, C073S028020
Reexamination Certificate
active
06842008
ABSTRACT:
A pulsed discharge detector includes a device and method for modular measurement of ionization signals from a sample. The pulsed discharge detector includes a discharge source in a chamber, a collector spaced from the discharge source, a monitor connected to a discharge electrode, an electrometer connected to the collector, a calibrator and a sample and hold processor. The discharge electrodes include a source electrode centrally located in relation to the discharge chamber wall. The collector is centrally located in relation to the chamber wall. Discharge signals are monitored for time and intensity. Collected signals are adjusted based on the discharge intensity. Collected signals are collected during a time window based on the discharge occurrence time. Detector output is predicated on collected signals coordinated with pulsed discharges. The calibrator of the present invention adjusts the collected signals to reduce discharge noise. The sample and hold processor accumulates selected adjusted signal values to quantify sample concentrations.
REFERENCES:
patent: 5394091 (1995-02-01), Wentworth et al.
patent: 5602468 (1997-02-01), Harrington
patent: 5767683 (1998-06-01), Stearns et al.
patent: 6448777 (2002-09-01), Abdel-Rahman et al.
patent: 6509562 (2003-01-01), Yang et al.
Cai Huamin
Stearns Stanley D.
Dole Timothy J.
Hudson III James E.
Keeling Kenneth A.
Keeling & Hudson L.L.C.
Le N.
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