双周期复合光纤光栅应变/温度双参量传感系统的研究

By ultraviolet rewriting technique of Fiber Bragg Grating (FBG) with phase and swing mask, the dual-period fiber grating is fabricated by writing the Long Period Grating and FBG in the same section of an uncovered hydrogen-loaded fiber orderly. Using the dual-period fiber grating as sensor unit, we demonstrate the temperature and strain sensor system. As is known, the Bragg wavelength of LPG and that of FBG have the different sensitivity of strain and temperature, then the cross-sensitivity is solved skillfully, and strain and temperature can be determined simultaneously by measuring the two transmitted Bragg wavelengths of the dual-period fiber grating. The accuracy of the sensor in measuring strain and temperature is estimated to be ±16μεin a range from 0 to 1700μεand ±0.8℃ from 0℃ to 120℃ respectively. Furthermore, FBG sensor unique merits, such as much small volume, stronger anti-jamming ability et. al. It can be anticipated that the dual-period fiber grating sensor can apply to inspect the strain and temperature of building, bridge, tunnel, dam et. al, and give birth to much economic and social benefit.

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