发明名称 |
Proximity detector using faraday effect and bidirectional transmission |
摘要 |
A proximity detector apparatus that uses the Faraday Effect to detect position changes of a target. The proximity detector includes a permanent magnet having a magnetic field that changes as the target moves to or from a predetermined position. A self-referencing optical sensor is provided that detects the changed magnetic field. The optical sensor includes a magneto-optic material positioned near a node of the magnet. Means are provided to transmit polarized interrogation light along an optical path that includes the magneto-optic material. The optical path is bi-directionally addressed and is non-reciprocal. The optical sensor transduces the changed magnetic field into a modulation of the interrogation light's intensity. Means are provided to detect variations in the interrogation light intensity and to determine a ratio such as the difference over the sum ratio for two interrogation light samples that traveled the optic path in opposite directions.
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申请公布号 |
US5149962(A) |
申请公布日期 |
1992.09.22 |
申请号 |
US19910709627 |
申请日期 |
1991.06.03 |
申请人 |
SIMMONDS PRECISION PRODUCTS, INC. |
发明人 |
MAURICE, LISA B. |
分类号 |
G01N33/28;G01R33/032;G01V3/08 |
主分类号 |
G01N33/28 |
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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