US Patent No. 9,804,377


Patent No. 9,804,377
Issue Date October 31, 2017
Title Low Numerical Aperture Exclusion Imaging
Inventorship Guy Kennedy, Underhill Center, VT (US)
Assignee University of Vermont and State Agricultural College, Burlington, VT (US)

Claim of US Patent No. 9,804,377

1. A low numerical aperture exclusion imaging apparatus having an electromagnetic illumination source for examining a specimen,
wherein the low numerical aperture exclusion imaging apparatus comprises;
an objective lens optically coupled to the electromagnetic illuminated portion of the specimen, for collecting an image created
by the electromagnetic radiation illuminating a portion of the specimen;

an optical blocking plate disposed between the objective lens and the specimen, wherein the optical blocking plate is positioned
to substantially block electromagnetic radiation transmitted through a center portion of the objective lens, and wherein the
optical blocking plate and objective lens are symmetric about a common axis;

wherein the optical blocking plate comprises:
an optical filter disposed substantially concentrically with the optical blocking plate; and
an optically transparent window disposed contiguously around the outer edge of the absorptive optical filter; and
wherein the optically transparent window comprises a single wavelength transmission filter.