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1. (WO2013144679) CORONA IONIZATION DEVICE AND METHOD

Pub. No.:    WO/2013/144679    International Application No.:    PCT/IB2012/002856
Publication Date: Fri Oct 04 01:59:59 CEST 2013 International Filing Date: Sat Nov 17 00:59:59 CET 2012
IPC: H01J 49/16
Applicants: OWLSTONE LIMITED
Inventors: ALLSWORTH, Max
HART, Matthew
SOMERVILLE, John
Title: CORONA IONIZATION DEVICE AND METHOD
Abstract:
A corona discharge ionizer device which emits ions generated by corona discharge to a gas flow to be ionized includes a discharge electrode having a pin configured tip portion. A second grid electrode positioned at a spaced distance from the discharge electrode is provided. The grid electrode is preferably formed from a sheet configured material which has at least one hole formed therein adapted and configured to permit the gas flow to pass therethrough. A power supply is coupled to the discharge electrode and grid electrode configured cause ion emission from the discharge electrode. The power supply is preferably an alternating current power supply configured to produce an alternating electric field region in close proximity to the tip portion of the discharge electrode sufficient to cause avalanche breakdown in the gas flowing in close proximity to the tip portion of the discharge electrode.