Intrusion detection system and a method therefor
First Claim
1. An intrusion detection system comprisinga first passive detecting means for detecting the presence of an intruder in a volume of space and for generating a first signal in response to the detection of said intruder;
- a second detecting means for detecting the presence of said intruder in said volume of space and for generating a second signal in response to the detection of said intruder;
a timing means for receiving said first signal and for generating a control signal after a period of delay in response to said first signal;
a signal switch means for receiving said control signal and for activating said second detecting means by supplying power thereto in response to said control signal; and
logic means for receiving said first and said second signals and for producing an alarm signal in response thereto, said alarm signal indicative of the detection of the presence of said intruder in said volume of space.
1 Assignment
0 Petitions
Accused Products
Abstract
A dual sensing intrusion detection system includes a passive infrared radiation detection sensor that generates a first output signal in response to the detection of an intruder in the volume of space. A second detection sensor is directed to the same volume of space and generates a second output signal in response to detection of the intruder. A switch activates the second detection sensor in response to the detection of the intruder by the infrared radiation detector. Logic circuit receives the first and second output signals and produces an alarm signal in response thereto to indicate the detection of the presence of the intruder in the volume of space.
-
Citations
11 Claims
-
1. An intrusion detection system comprising
a first passive detecting means for detecting the presence of an intruder in a volume of space and for generating a first signal in response to the detection of said intruder; -
a second detecting means for detecting the presence of said intruder in said volume of space and for generating a second signal in response to the detection of said intruder; a timing means for receiving said first signal and for generating a control signal after a period of delay in response to said first signal; a signal switch means for receiving said control signal and for activating said second detecting means by supplying power thereto in response to said control signal; and logic means for receiving said first and said second signals and for producing an alarm signal in response thereto, said alarm signal indicative of the detection of the presence of said intruder in said volume of space. - View Dependent Claims (2)
-
-
3. An intrusion detection system comprising
a passive detecting means for detecting the presence of an intruder in a volume of space and for generating a first signal in response to the detection of said intruder; -
a microwave detecting means having a ready state and an active state, for detecting the presence of said intruder in said volume of space and for generating a second signal in response to the detection of said intruder; a means for maintaining said second detecting means in said ready state; a switch means for activating said microwave detecting means by placing said microwave detecting means in said active state in response to said first signal; and logic means for receiving said first and said second signals and for producing an alarm signal in response thereto, said alarm signal indicative of the detection of the presence of said intruder in said volume of space. - View Dependent Claims (4, 5, 6, 7)
-
-
8. A method of detecting an intruder in a volume of space comprising:
-
passively detecting said intruder by a first detecting means directed at said volume of space and generating a first signal in response thereto; activating a second detecting means directed at said volume of space in response to said intruder detected by said first detecting means; generating a second signal in response to said second detecting means detecting said intruder in said volume space; and processing said first and said second signals to produce an alarm signal, indicative of the presence of said intruder in said volume of space. - View Dependent Claims (9, 10, 11)
-
Specification