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Rapid fiber Bragg grating ( FBG ) strain sensor with reflecting/transmitting filter for acoustic emission detection
Rapid fiber Bragg grating ( FBG ) strain sensor with reflecting/transmitting filter for acoustic emission detection
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机译:带反射/透射滤光片的快速光纤布拉格光栅(FBG)应变传感器,用于声发射检测
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摘要
To provide an optical fiber strain sensor device and a strain detection method, for measuring precisely acoustic emission (AE) and for detecting effectively a rapid strain change due to a shock load, an optical fiber strain sensor device includes an fiber Bragg grating (FBG) sensor (6) mounted on an object (15) to be measured, a broadband light source (11) for directing a broadband wavelength light ray to the FBG sensor, and an FBG filter (9) that reflects/transmits a light ray reflected from the FBG sensor, and, using the FBG filter, the optical fiber strain sensor device processes and detects a change in the center wavelength of the light ray by an amplitude change with filter (9) and detectors 12/13. Filter (9) may be replaced by a dielectric multilayer filter.
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