发明名称 |
Simultaneous time-domain and frequency-domain metal detector |
摘要 |
A metal detector capable of operating in both a time-domain mode and a frequency-domain mode includes a transmitter component and a receiver component. The transmitter component includes a transmitter coil that can receive both an AC and DC current source for frequency-and time-domain operation respectively. The AC signal is impressed on the DC signal such that while the transmitter coil is charging, frequency-domain sensing is occurring and when the transmitter coil is switched off, time-domain sensing is occurring. The receiver component uses a primary field bucking method to ensure that both time-and frequency-domain modes can operate with the receiver coil.
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申请公布号 |
US7078906(B2) |
申请公布日期 |
2006.07.18 |
申请号 |
US20040942146 |
申请日期 |
2004.09.16 |
申请人 |
THE JOHNS HOPKINS UNIVERSITY |
发明人 |
NELSON CARL V. |
分类号 |
G01V3/08;G01N27/72;G01V3/10;G01V3/15 |
主分类号 |
G01V3/08 |
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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