ROOM-TEMPERATURE FILTERING FOR PASSIVE INFRARED IMAGING

    公开(公告)号:IL210572D0

    公开(公告)日:2011-03-31

    申请号:IL21057211

    申请日:2011-01-11

    Abstract: A device, for imaging infrared radiation from a scene, includes a detector of the infrared radiation, an enclosure for keeping the detector at an operating temperature thereof, an optical system, outside the enclosure, for focusing the infrared radiation onto the detector via a window of the enclosure, and a filter. In one embodiment, the filter is positioned at an intermediate focal plane of the optical system. In another embodiment, the filter is on a surface of an optical element of the optical system and has a defocusing relationship to the detector.

    Generally v-shaped interferometer formed from beamsplitter deployed between geometrically similar prisms

    公开(公告)号:IL288736D0

    公开(公告)日:2022-02-01

    申请号:IL28873621

    申请日:2021-12-06

    Abstract: An optical device includes two prisms and a beamsplitter configuration. A first of the prisms has a first surface associated with a source and a second surface oblique to the first surface. A second of the prisms has a first surface associated with a detector and a second surface oblique to the first surface. The second surface of the first prism overlaps with the second surface of the second prism to define an interface region that partially extends along at least one of the second surfaces. The prisms are optically attached at the interface region, and the beamsplitter configuration overlies the interface region. A beam emitted by the source propagates through the prisms along two optical paths and reaches the detector as two coherent beams. Beams that propagate along the two optical paths are reflected from the beamsplitter configuration and transmitted by the beamsplitter configuration exactly once.

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