Ultrashort Long-Period Fiber Gratings Inscribed on a Single-Mode Fiber for Torsion Sensing Applications

Figure 4

LPFG sensor linear calibration of the (a) resonance and (b) attenuation responses for clockwise and counterclockwise axial torsion, for two LPFG lengths: 2.4 mm and 7.2 mm.

(a)

(b)