Abstract: One embodiment of a field coverage configurable passive infrared radiation intrusion detection device comprises a plurality of passive infrared radiation sensors. The device also has an optical element for gathering infrared radiation from different portions of a field and for focusing said infrared radiation onto said plurality of passive infrared radiation sensors. An electrical activation/deactivation circuit receives the output of each passive infrared radiation sensor and selectively activates/deactivates one or more of the plurality of passive infrared radiation sensor outputs thereby configuring the portions of the field covered by the passive infrared intrusion detection device. In another embodiment of a field coverage configurable passive infrared radiation intrusion detection device, the height coverage of the device is adjustable in the field.

Abstract: An improved alarm system that has an added illumination feature allowing locations to be both scanned for intruders, and illuminated upon intrusion detection. This illumination feature imparts a number of advantages over current alarm systems. Notably, lighting the area where an intrusion is detected can aid in identifying the intruder and possibly even intimidating him/her into leaving, especially during night time or other conditions of low ambient light. Also, the illumination feature can be configured so as to be activated independent of the alarm itself. In this manner, light can be provided during emergencies or any other time that users require additional light.