FAULT DETECTING INTRUSION DETECTION DEVICE
Assignee
C&K SYSTEMS, INC., A CORP. OF CA.
Filed
Aug 5, 1986
Granted
Dec 1, 1987
Location
PLEASANTON CA US
Abstract
In an improved intrusion detection device system of the dual-sensor type, wherein one sensor is a PIR sensor and the other is a microwave sensor, the improvement comprises counting the detection of intrusion separately by the microwave sensor and by the passive infrared sensor. Thereafter, the counts by the two separate detectors are compared and an indication is given if the number exceeds a certain user selectable threshold, to indicate fault in one of the two sensor subsystems.
Source: Google Patents
35 USC §181 Secrecy Order
Imposed
Feb 17, 1987
Rescinded
Apr 1, 1987
Duration
1 month
Inventor
- 1RICHARD A. JOHNSON
Record Details
- Patent number
- US 4710750
- Application
- 06893399
- Aerospace match
- Yes
- Dataset source
- 35 USC §181 SO records
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