Distributed optical fiber sound wave sensing system and detection device

The invention discloses a distributed optical fiber sound wave sensing system and a detection device.The distributed optical fiber sound wave sensing system comprises a laser, a chopper, a double-pulse generator, a signal generator, a filter, a first circulator, a photoelectric detector, a data acquisition system and an upper computer, the laser is connected with the chopper, the chopper is connected with the double-pulse generator, and the signal generator is connected with the signal generator; the double-pulse generator comprises a piezoelectric ceramic crystal, and the signal generator sends a pulse modulation signal to the chopper and sends a phase modulation signal to the piezoelectric ceramic crystal; the double-pulse generator is connected with a first port of the first circulator through the filter, a second port of the first circulator is connected with an optical fiber to be detected, and a third port of the first circulator is connected with the photoelectric detector; the output end of the photoe