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 another fiber-carrying guide module, and the first sensing fiber the third sensing fiber are fixed on the fiber-carrying guide module through another 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 Reyleigh optical receiver, a Brilliouin optical receiver, and an optical splitter;
• the output end of the driving power source is connected with the input end of the mode-locked laser, the input end of the driving power source is connected with the 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, the output end of the wavelength division multiplexer is respectively connected with the input end of the optical splitter and the input end of the optical path coupler, the output end of the optical splitter is respectively connected with the input end of the Reyleigh optical receiver and the input end of the Brilliouin optical receiver, the output end of the Reyleigh optical receiver and the output end of the Brilliouin optical receiver are connected with the input end of the controller, the output end of the optical path coupler is connected with the input end of the amplifier and the input end of the receiver, the output end of the receiver is connected with the input end of the detector, the output end of the detector is connected with the input end of the controller, the 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.