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14 February 2005 A low-cost strain sensor system based on a long-period fiber grating written by high-frequency CO2 laser pulses
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Abstract
By using the edge-filtering approach, a low-cost strain sensor system with the long-period fiber grating (LPFG) written by high frequency CO2 laser pulses is demonstrated for the measurement of both static and dynamic strains. In this system, the wavelength-shift induced by the strain applied to the LPFG is interrogated by using a single-frequency DFB laser source. The intensity change due to the wavelength-shift is received by a photodetector. In addition, the intensity fluctuation due to instability of the fiber link is compensated by using a reference light source at 1310nm. In the static measurement, the result shows that the relationship between the electrical output of the sensor and the strain is very linear. The resolution of this sensing system is better than 10με and the error is ±10με. Dynamic strain measurement over 5kHz is also demonstrated. This sensor system offers the advantages of low-cost and fast response.
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Yun-Jiang Rao and Jing-Yi Li "A low-cost strain sensor system based on a long-period fiber grating written by high-frequency CO2 laser pulses", Proc. SPIE 5634, Advanced Sensor Systems and Applications II, (14 February 2005); https://doi.org/10.1117/12.581167
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