Phi-OTDR sensitization method and device based on dynamic frequency drift compensation

The invention discloses a phi-OTDR sensitization method based on dynamic frequency drift compensation. The phi-OTDR sensitization method comprises the following steps: actively scanning light source output frequency of a phi-OTDR according to an inner modulation or outer modulation method, thereby acquiring phi-OTDR curve groups of different light frequency points; performing cross-correlation calculation on phi-OTDR curves of different light frequency points, confirming the size and the direction of light source frequency drift, and feeding back output frequency of a control light source; in the data processing process, selecting phi-OTDR curves with the highest cross-correlation values from different curve groups as effective data, and abandoning other curves with relatively low cross-correlation values, thereby compensating curve distortion caused by light source frequency drift. The invention further discloses a phi-OTDR sensitization device. As cross-correlation calculation is performed on the phi-OTDR curves of different light frequency points so as to confirm the size and the direction of frequency drift, driving of a phase position modulator can be fed back, and the light source frequency drift can be compensated. By adopting the scheme of the invention, the requirements of a phi-OTDR sensation system on light source stability are reduced, and the capability of capturing low-frequency disturbance of the system is greatly improved.