US 12,455,261 B2
Photoionization detector having improved gain and reduced humidity sensitivity
Charles R. Willcox, Hopkins, MN (US); David J. Jennings, Edina, MN (US); and Christopher T. Fields, Coon Rapids, MN (US)
Assigned to MOCON, INC., Brooklyn Park, MN (US)
Filed by Mocon, Inc., Brookyln Park, MN (US)
Filed on Sep. 29, 2023, as Appl. No. 18/478,046.
Application 18/478,046 is a continuation in part of application No. 18/473,539, filed on Sep. 25, 2023.
Application 18/473,539 is a continuation in part of application No. 18/176,624, filed on Mar. 1, 2023, granted, now 12,146,854.
Prior Publication US 2024/0295529 A1, Sep. 5, 2024
Int. Cl. G01N 27/66 (2006.01); G01N 33/00 (2006.01); H01J 47/02 (2006.01)
CPC G01N 27/66 (2013.01) [G01N 33/0047 (2013.01); H01J 47/02 (2013.01)] 20 Claims
OG exemplary drawing
 
19. A planar photoionization detector sensor comprising
a plate having a top surface and a bottom surface and being comprised of an electrically insulating substrate,
an opening for UV light to pass through,
a negative electrical potential pattern including a linear portion and a polarization plate,
an electron collecting electrode pattern including a wire suspended across the opening, and
a grounded potential conductive pattern having a first portion on the top surface and a second portion on the bottom surface,
wherein
the polarization plate runs adjacent to, and along, a length of the opening,
the grounded potential conductive pattern is interposed between the negative electrical potential pattern and an electron collecting electrode feed-thru pin,
the wire connects on its ends to openings located on either end of the opening,
the grounded potential conductive pattern is interposed between the wire openings and the opening,
the second portion of the grounded potential conductive pattern surrounds the opening,
a lower portion of the second portion of the grounded potential conductive pattern is a UV blocking electrode that runs adjacent to, and along, a length of the opening, and
the polarization plate on the top surface approximately aligns with the UV blocking electrode on the bottom surface.