A Wavelet-based Detection of Active Segments in Optical Interferometer Signal Caused by Fibre Strain

摘要

In this paper a wavelet-based method is presented for detection of active segments in optic interferometer signals which are caused by fibre strain. Active segments appear as high-frequency content in time-frequency representation of optic signals. These segments are extracted by using continuous wavelet transformation with Mexican hat wavelet function. The aim of our experiment was based on a controllable strain of optic fibre by using step motor. Seven experimental trials were performed with different patterns of step-motor activation. Due to the nature of optic signal the proposed method successfully located all active segments with average delays of 5.16±2.33 and minimum delays of 1.49±0.43. This accuracy proves the proposed method can reliably segment optic-fibre strain signals.