Motion detector
First Claim
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1. A motion detector responsive to incident radiation, comprising:
- a box having a pair of opposite ends, and two pairs of opposing walls extending between said ends, an inlet opening for said incident radiation being provided generally at one of said ends, at least one of said pairs of walls being provided internally with reflecting surfaces;
focusing optics including a concave mirror mounted in said box at the other of said ends and being concave in the direction of said one of said ends;
radiation sensing means ahead of said one of said ends of said box having an optical axis generally directed toward said other end of said box for outputting a signal representing motion in horizontal and vertical sensing field planes from which said incident radiation enters said box through said opening and is reflected toward and focussed upon said radiation sensing means by said optics and said reflecting surfaces; and
at least two relectors independent of said walls for radiation each from an respective one of said field planes flanking an aperture through which said radiation is focussed upon said radiation sensing means, said reflectors diverging away from said optical axis of said radiation sensing means toward said optics and including angles of up to 20°
with said axis.
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Abstract
A motion detector of the space surveillance type wherein an elongate box has parallel walls and an aperture opening toward sensors, and a pair of upwardly divergent reflectors is provided for at least one of the two sensing field planes, the reflectors making an angle of 20° or less with each other.
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Citations
11 Claims
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1. A motion detector responsive to incident radiation, comprising:
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a box having a pair of opposite ends, and two pairs of opposing walls extending between said ends, an inlet opening for said incident radiation being provided generally at one of said ends, at least one of said pairs of walls being provided internally with reflecting surfaces; focusing optics including a concave mirror mounted in said box at the other of said ends and being concave in the direction of said one of said ends; radiation sensing means ahead of said one of said ends of said box having an optical axis generally directed toward said other end of said box for outputting a signal representing motion in horizontal and vertical sensing field planes from which said incident radiation enters said box through said opening and is reflected toward and focussed upon said radiation sensing means by said optics and said reflecting surfaces; and at least two relectors independent of said walls for radiation each from an respective one of said field planes flanking an aperture through which said radiation is focussed upon said radiation sensing means, said reflectors diverging away from said optical axis of said radiation sensing means toward said optics and including angles of up to 20°
with said axis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A motion detector responsive to incident radiation, comprising:
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a box having a pair of opposite ends, and two pairs of opposing walls extending between said ends, an inlet opening for said incident radiation being provided generally at one of said ends, at least one of said pairs of walls being provided internally with reflecting surfaces; radiation sensing means ahead of said one of said ends of said box having an optical axis generally directed toward said other end of said box for outputting a signal representing motion in horizontal and vertical sensing field planes from which said incident radiation enters said box through said opening and is reflected by said reflecting surfaces; and focusing optics including a concave mirror mounted in said box at the other of said ends and being concave in the direction of said one of said ends for focussing radiation reflected onto said mirror by said reflecting surfaces upon said radiation sensing means, said concave mirror having a different radius of curvature for radiation arising from said horizontal sensing field plane from its radius of curvature for radiation arising from said vertical sensing field plane.
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11. A motion detector responsive to incident radiation comprising:
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a box having a pair of opposite ends and two pairs of mutually parallel opposite walls extending between said ends and formed internally with reflective surfaces, one wall of one of said pairs being provided close to one end of said box with a window admitting said radiation; radiation sensing means at said one end of said box having an optical axis generally parallel to the walls of said one pair for outputting a signal representing motion in horizontal and vertical sensing field planes from which said incident radiation enters said box through said window and impinges upon said reflective surfaces; focusing optics at the opposite end of said box and including a concave mirror receiving radiation entering from said window and focusing it on said radiation sensing means; and at least two reflectors independently of said walls from a respective one of said sensing field planes flanking an aperture through which said radiation is focused upon said radiation sensing means, diverging away from said radiation sensing means toward said optics and including angles up to 20°
with said axis.
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Specification