2124 PERFORMANCE EVALUATION OF BOTDA BASED DISTRIBUTED OPTIC FIBER SENSORS FOR CRACK MONITORING

ABASTRACT In this paper a standard method is proposed to evaluate the measurement performance of the distributed and long-gauge FOSs for crack monitoring. The performance evaluation of the pulse-prepump Brillouin Optical Time Domain Analysis (PPP-BOTDA) based distributed FOSs is then performed based on the proposed method. Experimental results show that point fixation installation methods can effectively and correctly detect crack width when the gauge length of FOSs longer than the critical effective sensing length (CESL), and the overall bonding method still not feasible for monitoring crack width quantitatively.