Mocon, Inc.

David J Jennings

Christopher Fields

Charles Willcox

A photoionization detector comprised of a gas discharge lamp that ionizes molecules of interest to create ionized molecules and electrons and a sensor having at least one opening for UV light to pass through and electrically conductive patterns on at least one of the top and bottom surfaces of the plate, including at least a negative electrical potential pattern and an electron collecting electrode pattern. The ionized molecules are collectable by a bias electrode and electrons are collectable by a collector electrode. The negative electrical potential pattern includes a linear portion and a polarization plate. The electron collecting electrode pattern includes a wire suspended across the at least one opening and a linear portion on the surface opposite the wire. The electrically conductive patterns can further include a grounded potential conductive pattern having a first portion on the top surface and a second portion on the bottom surface.

Photoionization detector having improved gain and reduced humidity sensitivity

A photoionization detector comprised of a gas discharge lamp that ionizes molecules of interest to create ionized molecules and electrons and a sensor having at least one opening for UV light to pass through and electrically conductive patterns on the top and bottom surfaces of the plate. A negative electrical potential pattern can be on one of the top or the bottom surface and can include an interior portion that is at least a first distance away from every edge of the at least one opening. An electron collecting electrode pattern can be on the other of the top or the bottom surface and can substantially fill an area surrounding the opening such that the negative electrical potential pattern and the electron collecting electrode pattern are offset relative to each other. The ionized molecules are collectable by a bias electrode and electrons are collectable by a collector electrode.

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Edina, MN, United States of America

David J Jennings