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Rate sensitivity of high birefringent fiber optic sensors under large dynamic loads

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2 Author(s)
Ansari, F. ; Dept. of Civil & Environ. Eng., New Jersey Inst. of Technol., Newark, NJ, USA ; Wang, J.

New experimental studies on the effects of large dynamic compressive loads on highly birefringent optical fibers are presented. The intensity rate of applied dynamic loads ranged between 2.18-6719 KN/m-sec. A Fibercore (previously York) HB600 Bow-Tie fiber with an initial beat length of 1.16 mm was employed in the present study. Sensor response is discussed in terms of the effects of force amplitudes and velocities on the calibration parameter Tf. Tf is a function of the amplitude as well as the velocity of applied loading. Therefore, calibration of the sensor should be achieved through regression analysis of the load-fringe data for the entire spectrum of the desired force velocities. The ramification of this finding is that a single experiment for the measurement of Tf cannot provide the required parameters for calibration. This further implies that the change in beat length is also dependent on the amplitude and velocity of loading. The suggested method takes both effects into account through empirical analysis of experimental data

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Lightwave Technology, Journal of  (Volume:13 ,  Issue: 10 )