发明名称 |
Inductive proximity sensor with periodic switching for sensing the presence of objects |
摘要 |
An inductive proximity sensor determines if a metallic object is in close proximity. An inductor is placed near the object. Several switches control the direction of the voltage passing through the inductor. During a first time period, the voltage flows through the inductor to induce a magnetic field in the object. During the second time period, the voltage is reversed in the inductor to quickly eliminate any current in the inductor. The decaying magnetic field in the object induces a voltage in the inductor which is measured during a third time period and compared to a reference value to determine the proximity of the object to the sensor.
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申请公布号 |
US5498958(A) |
申请公布日期 |
1996.03.12 |
申请号 |
US19930145180 |
申请日期 |
1993.11.03 |
申请人 |
DETRA SA |
发明人 |
TU, MAI X.;SCHWAB, MICHEL |
分类号 |
H03K17/95;(IPC1-7):G01B7/00;G01V3/10 |
主分类号 |
H03K17/95 |
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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