Abstract: We proposed an optical fiber vibration sensing system based on φ-optical time domain reflectometer (φ-OTDR). Eleven characteristic parameters, such as main wave energy, main lobe delay, main peak value, main wave Q value, signal spectrum, 3 dB time delay, peak value of main lobe, center frequency, second return loss, wave number and half wave length were extracted as reference criteria, and the target recognition method of multi-parameter fuzzy evaluation matrix was used to recognize and classify similar targets in five groups of 200 experiments. The results show that the comprehensive recognition rate is 90.87%. This method improves the accuracy of similarity recognition by using multi-angle parameters to measure and discriminate targets.

Key words: φ-OTDR distributed optical fiber sensing, Rayleigh scattering, mode recognition, multi-characteristic parameters