专利名称：Fault-detecting intrusion detection device发明人：Johnson, Richard Adam申请号：EP87306935申请日：19870805公开号：EP0259015A3公开日：19880706
摘要：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 improvementcomprises counting the detection of intrusion separately by the microwave sensor and bythe passive infrared sensor. Thereafter, the counts by the two separate detectors arecompared and an indication is given if the number exceeds a certain user selectablethreshold, to indicate fault in one of the two sensor subsystems.
申请人：C & K Systems, Inc.
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