Passive infrared intrusion detection system
First Claim
1. A passive infrared intrusion detection system comprising:
- a mirror assembly including a focusing mirror having a focal length providing a relatively narrow field of view in a first plane; and
at least one mirror having a two dimensional surface selectively curved along one of the dimensions of the surface only and cooperative with the focusing mirror to provide a relatively large field of view in a second plane transverse to the first plane; and
a detector disposed at the focus of the focusing mirror and operative to provide electrical signals in response to and representative of radiation received from the fields of view.
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Accused Products
Abstract
A passive infrared intrusion detection system having a mirror assembly providing a protective curtain which is relatively narrow in the horizontal plane and which substantially encompasses the vertical space of a protected facility. The mirror assembly includes a focusing mirror and at least one cylindrical mirror which is cooperative with the focusing mirror to provide a relatively large field of view in the vertical plane and a relatively narrow field of view in the horizontal plane. An infrared detector is disposed along the optical axis of the focusing mirror and at the focus thereof to provide electrical signals in response to received radiation from the fields of view. The detector signals are electronically processed to provide an output indication of intruder presence.
55 Citations
26 Claims
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1. A passive infrared intrusion detection system comprising:
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a mirror assembly including a focusing mirror having a focal length providing a relatively narrow field of view in a first plane; and at least one mirror having a two dimensional surface selectively curved along one of the dimensions of the surface only and cooperative with the focusing mirror to provide a relatively large field of view in a second plane transverse to the first plane; and a detector disposed at the focus of the focusing mirror and operative to provide electrical signals in response to and representative of radiation received from the fields of view. - View Dependent Claims (2)
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3. A passive infrared intrusion detection system comprising:
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at least one first mirror having a two dimensional surface selectively curved along one of the dimensions of the surface only and disposed to receive radiation from a facility being monitored; a focusing mirror in radiation receiving relationship with said at least one first mirror; a detector disposed at the focus of the focusing mirror and operative to provide electrical signals in response to and representative of radiation received from the fields of view; the focusing mirror hving a focal length providing a relatively narrow field of view in a first plane; and the at least one first mirror being cooperative with the focusing mirror to provide a relatively large field of view in a second plane transverse to the first plane. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A passive infrared intrusion detection system comprising:
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a plurality of first mirrors each having a two dimensional surface selectively curved along one of the dimensions of the surface only, each disposed to receive radiation from a respective field of view; a focusing mirror in radiation receiving relationsip with said plurality of first mirrors; the focusing mirror being cooperative with each of said first mirrors to provide a relatively narrow field of view in respective first planes and to provide a relatively large field of view in respective second planes transverse to the first planes; and a detector disposed at the focus of the focusing mirror and operative to provide electrical signals in response to and representative of radiation received from the fields of view. - View Dependent Claims (23, 24, 25, 26)
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Specification