Ceiling mountable passive infrared intrusion detection system
First Claim
1. A ceiling mountable passive infrared intrusion system for detecting an intruder when present on the floor of an area to be protected and when present between the ceiling and the floor of the area to be protected, comprising:
- a first mirror for focusing radiation incident thereon at a focus;
means including a second miror for providing a curtain like first field of view that has a nominal range, a comparatively narrow azimuthal extent, and a comparatively wide elevational extent, and cooperative with the first mirror for directing the radiation present in the first field of view onto the focus;
means including a third mirror for providing a generally disc-like second field of view that is generally transverse the first field of view that has a nominal range, a comparatively narrow elevational extent, and a comparatively wide azimuthal extent, and cooperative with the first mirror for directing the radiation present in the second field of view onto the focus;
a fourth mirror for focusing radiation incident thereon at said focus and in spaced relation to said first mirror defining therebetween an opening;
means including a fifth mirror for providing a generally-conical third field of view through said opening and cooperative with said fourth mirror for directing radiation present in the third field of view onto said focus; and
an infrared detector positioned at said focus of the first and fourth mirros and along the optical axis thereof and operative in response to the radiation focused thereat to provide an electrical signal representative of intruder presence.
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Accused Products
Abstract
The disclosed ceiling mountable passive infrared intrusion detection system includes a field forming mirror assembly and a focusing mirror assembly cooperative to provide a field of view having plural first vertical curtains, a generally disc-shaped horizontal second curtain, and a generally conical downwardly directed third curtain. In one embodiment, first and second conical field forming mirrors are cooperative with different and spaced-apart spherical focusing mirrors to provide the horizontal curtain and the downwardly directed conical curtain. An unbalanced detector is disclosed that cooperates with the energy pattern received from the conical field forming mirrors to signal intruder presence. In another embodiment, first and second pluralities of planar field forming mirrors are cooperative with the different and spaced-apart spherical focusing mirrors to respectively provide a first plurality of substantially horizontal finger beams and a second plurality of plural downwardly directed finger beams. In this embodiment, a balanced detector is disclosed that cooperates with the energy pattern received from the first and second pluralities of finger beams to signal intruder presence.
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Citations
21 Claims
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1. A ceiling mountable passive infrared intrusion system for detecting an intruder when present on the floor of an area to be protected and when present between the ceiling and the floor of the area to be protected, comprising:
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a first mirror for focusing radiation incident thereon at a focus; means including a second miror for providing a curtain like first field of view that has a nominal range, a comparatively narrow azimuthal extent, and a comparatively wide elevational extent, and cooperative with the first mirror for directing the radiation present in the first field of view onto the focus; means including a third mirror for providing a generally disc-like second field of view that is generally transverse the first field of view that has a nominal range, a comparatively narrow elevational extent, and a comparatively wide azimuthal extent, and cooperative with the first mirror for directing the radiation present in the second field of view onto the focus; a fourth mirror for focusing radiation incident thereon at said focus and in spaced relation to said first mirror defining therebetween an opening; means including a fifth mirror for providing a generally-conical third field of view through said opening and cooperative with said fourth mirror for directing radiation present in the third field of view onto said focus; and an infrared detector positioned at said focus of the first and fourth mirros and along the optical axis thereof and operative in response to the radiation focused thereat to provide an electrical signal representative of intruder presence. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification