Abstract
Parallel-integrated fiber Bragg grating (PI-FBG) arrays use a femtosecond laser line-by-line method. Each FBG in the fiber grating array is fabricated at the same position along the axial direction of a multimode fiber core but at different radial directions. The PI-FBG array can be used to realize a temperature-insensitive vector bending sensor. Such a sensor can not only measure bending curvature but also determine any bending direction. By introducing the demodulation method of equivalent fiber grating, that is, the difference operation of the FBG reflection wavelength changes, the cross-sensitivity problem between the bending and the temperature is overcome, and the bending sensitivity of the sensor is almost doubled; thus, the resolution of the bending sensor is remarkably improved. Therefore, the vector bending sensor can achieve the real-time monitoring of the bending curvature and bending direction of an intelligent engineering structure.
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