Intrusion detection system with a segmented radiation sensing mirror
Multiple range passive infrared detection system
Intruder detection system
Apparatus and method for detecting the presence of a heat-emitting body
Radiation detector with asymmetrical pattern
Infrared-type intrusion detector Patent #: 4551711
ApplicationNo. 07/285326 filed on 12/13/1988
US Classes:250/342, Locating infrared emissive objects340/567Electromagnetic energy
ExaminersPrimary: Howell, Daniel W.
Attorney, Agent or Firm
International ClassesG08B 13/189 (20060101)
G08B 13/19 (20060101)
Foreign Application Priority Data1986-01-24 JP
AbstractAn apparatus for perceiving an intruder by means of detecting infrared rays radiated from the intruder through a plurality of detectable infrared flux enveloping spaces spanned supposedly between the infrared receiving portion of the apparatus and a plurality of sub-domains supposed on the ground, the detectable infrared flux enveloping spaces being arranged densely so that at least two of them may always be crossed by an intruder, and such a dense arrangement of the detectable infrared flux enveloping spaces being effected with a multi-lens system molded in one body so as to have on its surface a plurality of infrared converging lenses having their respective principal axes differently directed providing the detectable infrared flux enveloping spaces.