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We propose and experimentally demonstrate a technique to extend the dynamicsensing range of phase sensitive optical time domain reflectometry system basedon the frequency interrogation. Benefitting from the range Doppler couplingfeature, the frequency modulation pulse is capable of measuring the frequencyshift induced by the dynamic strain, thus the large dynamic strain can berecovered. The performance of the proposed method is experimentally evaluatedby comparing it with phase unwrapping. The strain sensing rang can at least beincreased by factor of hundreds, and fast dynamic strain with peak to peak 130microstrain vibration frequency of 20 kHz is measured.

Extending the dynamic strain sensing rang of phase-OTDR with frequency modulation pulse and frequency interrogation