发明名称 |
Perimeter monitoring system |
摘要 |
A perimeter monitoring system is arranged to detect passage across a perimeter of an area. The system primarily includes an emitter, a retroreflector, a detector and an alarm. The emitter provides a modulated visible laser beam. The retroreflector is arranged to direct the beam along a segment of the perimeter and return the beam along the segment. The detector includes a device that blocks reception of light outside an angle of less than 5 degrees. One or more local or remote alarms are activated in response to the signal. For example, a remote alarm is located on the inside of a residence window where it is activated by another visible laser beam. Alignment of the peripheral monitoring system is less costly and false alarms are less likely than with known systems.
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申请公布号 |
US6822566(B2) |
申请公布日期 |
2004.11.23 |
申请号 |
US20010832694 |
申请日期 |
2001.04.10 |
申请人 |
ON-GUARD POOL PRODUCTS, LLC |
发明人 |
MATTHEWS LESTER R.;BERK THOMAS E.;FARRIER M. SHAUN |
分类号 |
G08B13/18;(IPC1-7):G08B13/18 |
主分类号 |
G08B13/18 |
代理机构 |
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