Adt, Inc.

George Vulgaris

John K Guscott

Bryan R Hotaling

H Patrick Thornton

Alarm display

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.degree. 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.

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Sharon, MA, United States of America

George Vulgaris