发明名称 |
A METHOD, A DEVICE AND A SYSTEM FOR PREVENTING FALSE ALARMS IN A THEFT-PREVENTING SYSTEM |
摘要 |
<p>The invention relates to a method, a device and a system for preventing false alarms in a theft-preventing system comprising a magnetic field for detecting at least one metal object in a first detection zone and means for determining a time-difference; said method comprising the steps of detecting a first change in a parameter indicative of the magnetic field in said first detection zone; detecting a second change in the parameter indicative of the magnetic field in said first detection zone; determining a time-difference between the detection of said first change in said parameter and the detection of said second change in said parameter; and performing an action based on said time-difference. In this way, false alarms due to a metal detector falsely detecting for example movement of metal-doors in a first detection zone may be reduced/eliminated. Additionally, the false alarms due to an opening and/or closing of a door with metal parts acting as an active tag may be reduced/eliminated.</p> |
申请公布号 |
WO2008125621(A1) |
申请公布日期 |
2008.10.23 |
申请号 |
WO2008EP54414 |
申请日期 |
2008.04.11 |
申请人 |
ALERT METALGUARD APS;FALKENBERG, VERNER;SOERENSEN, SOEREN |
发明人 |
FALKENBERG, VERNER;SOERENSEN, SOEREN |
分类号 |
G08B13/24;G08B29/04 |
主分类号 |
G08B13/24 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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