Abstract: A ceiling mounted infrared intrusion detection system achieves 360-degree viewing capability by employing concentric rings of mirrors arranged to view multiple segments within an annular volume of space and focus on a centrally located detector. The rings of mirrors have multiple facets, each of which facets reflects radiation from a segment of space being viewed and focuses the radiation on the detector. The rings are disposed in spaced relationship to one another to provide shorter focal lengths for the mirror facets disposed to view space closest to the detector and a path between the rings through which reflected radiation focused on the detector may pass. the centermost ring is open to permit the detector to view directly therethrough.

Abstract: A mechanical rejection mechanism for an automatic sorting machine has an inclined surface along which the objects to be sorted move by gravity. A separate section of the surface is movable outwardly by an operating mechanism responsive to an upstream sensor to push rejected objects off the surface toward a reject collecting station.

Abstract: An optical system for use with apparatus for grading articles of produce according to color. The simplified system is comprised of an aspherical lens, a field stop and an end of a fiber optic bundle at the image plane of the lens. Color filters and photoelectric detectors are positioned from the opposite end of the bundle at a distance so as to be uniformly illuminated by light emanating from each fiber of the bundle upon which a portion of the image is present.

Abstract: An optical system for use on produce graders to enhance intensity and uniformity of reflected light directed onto color detectors.