摘要
An optical fiber strain sensor utilizing the mode-mode interference of LP<sub>01</sub><sup>x</sup>,andLR<sub>11</sub><sup>x</sup>,modes in bow tie optical fibers is described.The heterodyne interference caused byfrequency modulation of laser diode（LD） with ramp injection current is used torealize the detection of linear phase.Experimental results show a resolution of about 2%of one fringe corresponding to a strain of 2.9με.m.
An optical fiber strain sensor utilizing the mode-mode interference of LP01x, and LPJ11x modes in bow tie optical fibers is described. The heterodyne interference caused by frequency modulation of laser diode (LD) with ramp injection current is used to realize the detection of linear phase. Experimental results show a resolution of about 2% of one fringe corresponding to a strain of 2.9m.
