Steerable mirror assembly and cooperative housing for a passive infrared intrusion detection system
First Claim
1. A ceiling mountable passive infrared intrusion detection system, comprising:
- a first mirror for focusing radiation incident thereon at a focus;
a second mirror for providing a curtain-like first field of view that has 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;
a third mirror for providing a curtain-like second 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 second field of view onto the focus;
means coupled to said second and said third mirrors for mounting said second and said third mirrors for relative rotation about a common axis such that said first and said second fields of view are independently steerable and substantially non-interfering; and
an infrared detector positioned at the focus of the first mirror and operative in response to the radiation focused thereat to provide an electrical signal representative of intruder presence.
6 Assignments
0 Petitions
Accused Products
Abstract
The disclosed steerable mirror assembly and cooperative housing for a ceiling mountable passive infrared intrusion detection system of the present invention includes first and second relatively rotatable field forming mirrors cooperative with a focusing mirror to provide first and second substantially curtain-like fields of view at any selected pointing directions through 360° of azimuth. The field forming mirrors have a preselected non-constant radius of curvature selected to provide uniform detection sensitivity at any range within the fields of view of the several curtains. A modular housing is disclosed having cooperative, releasably assemblable components that allows ready in-the-field installation, and subsequent maintenance and troubleshooting. The housing includes a tamper switch that is operative upon an unauthorized tampering with the housing after installation to provide a signal indication of a possible system deactivization attempt.
27 Citations
8 Claims
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1. A ceiling mountable passive infrared intrusion detection system, comprising:
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a first mirror for focusing radiation incident thereon at a focus; a second mirror for providing a curtain-like first field of view that has 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; a third mirror for providing a curtain-like second 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 second field of view onto the focus; means coupled to said second and said third mirrors for mounting said second and said third mirrors for relative rotation about a common axis such that said first and said second fields of view are independently steerable and substantially non-interfering; and an infrared detector positioned at the focus of the first mirror 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)
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Specification