发明名称 |
Optical fiber strain sensor for measuring maximum strain |
摘要 |
An optical fiber strain sensor is provided which remembers the maximum strain a structure has experienced in a given timeframe. A pair of multi-mode optical fibers with flat ends meet end-to-end within a microbore capillary tube with which the fibers have frictional contact. The fibers are fastened to the structure at two points a known distance apart on either side of the capillary tube. Increasing strain in the structure pulls the fiber ends apart in proportion to the amount of strain; however, when strain is decreasing, the fibers buckle rather than move closer together. Therefore, the maximum strain is reflected as a maximum distance between the fiber ends. When the maximum strain experienced is to be measured, the free end of one fiber is connected to a light source and the free end of the other fiber is connected to a detector. The intensity of light transmitted to the detector will vary inversely with the distance apart the fiber ends are; therefore, this distance can be measured and correlated with strain to a high degree of accuracy.
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申请公布号 |
US5461927(A) |
申请公布日期 |
1995.10.31 |
申请号 |
US19940272915 |
申请日期 |
1994.06.30 |
申请人 |
THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF THE NAVY |
发明人 |
BOBB, LLOYD C.;KRUMBOLTZ, HOWARD D. |
分类号 |
G01B11/16;G01D5/26;G01L1/24;G02B6/36;(IPC1-7):H01J5/16;G02B6/02 |
主分类号 |
G01B11/16 |
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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