发明名称 |
Fiber optic moisture sensor with moisture-absorbing reflective target |
摘要 |
A method and apparatus for sensing moisture changes by utilizing optical fiber technology. One embodiment uses a reflective target at the end of an optical fiber. The reflectance of the target varies with its moisture content and can be detected by a remote unit at the opposite end of the fiber. A second embodiment utilizes changes in light loss along the fiber length. This can be attributed to changes in reflectance of cladding material as a function of its moisture content. It can also be affected by holes or inserts interposed in the cladding material and/or fiber. Changing light levels can also be coupled from one fiber to another in an assembly of fibers as a function of varying moisture content in their overlapping lengths of cladding material.
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申请公布号 |
US4634856(A) |
申请公布日期 |
1987.01.06 |
申请号 |
US19840637627 |
申请日期 |
1984.08.03 |
申请人 |
THE UNITED STATES OF AMERICA AS REPRESENTED BY THE UNITED STATES DEPARTMENT OF ENERGY |
发明人 |
KIRKHAM, RANDY R. |
分类号 |
G01N21/43;G01N21/77;G01N21/81;G01N21/85;(IPC1-7):H01J5/16 |
主分类号 |
G01N21/43 |
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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