发明授权
- 专利标题: Magnetic field sensing for tamper identification
- 专利标题(中): 用于篡改识别的磁场感测
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申请号: US11801951申请日: 2007-05-11
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公开(公告)号: US07495555B2公开(公告)日: 2009-02-24
- 发明人: Brian Keith Seal , Brent Martin
- 申请人: Brian Keith Seal , Brent Martin
- 申请人地址: US WA Liberty Lake
- 专利权人: Itron, Inc.
- 当前专利权人: Itron, Inc.
- 当前专利权人地址: US WA Liberty Lake
- 代理机构: Dority & Manning, P.A.
- 主分类号: G08B13/24
- IPC分类号: G08B13/24
摘要:
The present technology involves a method and apparatus for detecting and reporting magnetic fields in the proximity of a utility meter as an approach to determining tampering of such meter. The sensitivity level of the magnetic field sensors may be adjustable allowing either remote or local sensitivity adjustments to a magnetic field sensor to compensate for variations in the electromagnetic environments of different meter installation sites. Alternatively, the output of each magnetic field sensor may be connected to the input of an adjustable threshold circuit. When the output voltage of the magnetic field exceeds a predetermined threshold voltage, a magnetic event signal is generated. Threshold adjustments to the adjustable threshold circuit may be performed locally at the meter site or remotely from a station. The output of each magnetic field sensor may be monitored by a locally or remotely programmable magnetic sensor output monitor. Such magnetic sensor output monitor generates a magnetic event signal when a predetermined number of magnetic sensors have been activated.
公开/授权文献
- US20070229256A1 Magnetic field sensing for tamper identification 公开/授权日:2007-10-04
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