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- W2019566195 abstract "As a sensing cell, Fiber Bragg grating (FBG) can transduce physical quantities like strain, temperature, etc, havingattractive merits of being small and light, resistance to corrosion and immunity to electromagnetic interference, etc.Commercial FBG strain sensor has a sensing range of no more than 9000 μe (0.9%), however, larger-range strain sensoris demanded in industry such as heavy structural distortion and crack-happening. A new kind of large strain sensor basedon FBG is studied here. The sensing element has a metal trapezoidal frame. The two feet of the frame can sense a largestrain of the body, which is converted to a small strain on the surface of the frame' beam. The attached FBG senses thissmall strain, and then the body's strain can be known from the FBG's wavelength shift. The trapezoidal frame is takentheoretically analysis adopting the 'unit load method' and numerical simulation by finite element method. Thesensitivity model of the sensor between the body's strain and the FBG's wavelength shift is deduced and verified. Reallarge strain sensors are homemade, with verifying sizes. The large strain is controlled by a motorized translation stage,and the FBG's wavelength shift is interrogated by MOI sm125 interrogator. The experimental results show anoutstanding large-strain sensing ability of the sensors, having the sensing range of -20~40%, with the linearity of lessthan 1%, the hysterisis error of less than 1% and the repeatability of less than 0.9%." @default.
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- W2019566195 date "2011-06-09" @default.
- W2019566195 modified "2023-09-23" @default.
- W2019566195 title "A large-scale strain sensor based on fiber Bragg grating" @default.
- W2019566195 doi "https://doi.org/10.1117/12.900934" @default.
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