Area intrusion adjustable detector unit

Abstract

An area intrusion adjustable detector unit having transmitting and receiving transducers which may be accurately aimed and pointed to areas to be monitored without changing the position of or moving the unit. The unit may be in single transmitter-receiver form, or (as for monitoring two separate and distinct areas or rooms) may have two separately mounted and adjustable transmitter-receiver sets, each set adapted to be adjusted for precision aiming independently of the other set for different target areas, without changing the position of the unit. In addition to the transducer aiming features, the unit is adjustable as to regions of air turbulence caused by baseboard radiators, space heaters, fans, etc. resulting in air motion, door, windows and walls vibrating when traffic passes, moving objects such as household pets, and hanging objects that sway, creating misleading doppler shifts of the range that would be caused by a human intruder. Since a greater area of coverage than conventional systems is achieved in the unit, its overall sensitivity, in hostile environments, can be turned down, eliminating coverage of false intrusion signals, while maintaining ample area coverage.

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