Distributed sensing fiber acoustic emission fusion sensing system and running method

A distributed sensing fiber acoustic emission fusion sensing system, comprising a sensing fiber temperature-sensitive compensation device and a sensing fiber acoustic emission demodulation device, wherein a sensing fiber starts from the sensing fiber acoustic emission demodulation device, passes through the sensing fiber temperature-sensitive compensation device, and finally returns to the sensing fiber acoustic emission demodulation device, and a head and a tail of the sensing fiber in the sensing fiber temperature-sensitive compensation device need to be connected with the sensing fiber acoustic emission demodulation device;

• the sensing fiber temperature-sensitive compensation device comprises a fiber-carrying guide module and a temperature-sensitive compensation module, a first sensing fiber, a second sensing fiber and a third sensing fiber pass through the fiber-carrying guide module, the fiber-carrying guide module is provided with built-in fiber-fixing modules for fixing the first sensing fiber and the third sensing fiber, the first sensing fiber and the third sensing fiber are fixed by the built-in fiber-fixing modules and then disposed in parallel with the second sensing fiber;
• the first sensing fiber and the third sensing fiber are arranged on an upper surface of a circular arc-shaped housing, the second sensing fiber passes through the temperature compensation device and then is fixed on a second fiber-carrying guide module, and the first sensing fiber the third sensing fiber are fixed on the fiber-carrying guide module through a second pair of built-in fiber-fixing modules;
• and
• the sensing fiber acoustic emission demodulation device comprises a driving power source, a mode-locked laser, a femtosecond laser optical frequency comb, a pulse modulator, a wavelength division multiplexer, an optical path coupler, an amplifier, a receiver, a detector, a controller, a concrete structure safety behavior evaluation system, an acoustic emission signal, a Rayleigh optical receiver, a Brillouin optical receiver, and an optical splitter;
• an output end of the driving power source is connected with an input end of the mode-locked laser, an input end of the driving power source is connected with an output end of the controller, the mode-locked laser is connected with the femtosecond laser optical frequency comb, the pulse modulator and the wavelength division multiplexer in sequence, an output end of the wavelength division multiplexer is respectively connected with an input end of the optical splitter and an input end of the optical path coupler, an output end of the optical splitter is respectively connected with an input end of the Rayleigh optical receiver and an input end of the Brillouin optical receiver, an output end of the Rayleigh optical receiver and an output end of the Brillouin optical receiver are connected with an input end of the controller, an output end of the optical path coupler is connected with an input end of the amplifier and an input end of the receiver, an output end of the receiver is connected with an input end of the detector, an output end of the detector is connected with the input end of the controller, an output end of the amplifier is connected with a fiber acoustic emission sensing device, and the output end of the controller is connected with the concrete structure safety behavior evaluation system.