A Distributed Optical Fiber Sensing System for Suppressing Common Mode Noise and Its Suppressing Method
A technology of distributed optical fiber and sensing system, which is applied in the direction of using optical devices to transmit sensing components, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., which can solve the insensitivity of sound pressure and acceleration, the difficulty of implementation, and the increase of system complexity, etc. problems, to achieve the effect of eliminating common mode noise and suppressing common mode noise signals
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[0040] The present invention will be further elaborated below through specific embodiments in conjunction with the accompanying drawings.
[0041] like figure 1 As shown, in this embodiment, the distributed optical fiber sensing system adopts the sensing fiber, and the distributed optical fiber sensing system of this embodiment for suppressing common mode noise includes: a narrow linewidth laser S, a first coupler OC1, a first Acousto-optic modulator AOM1, second acousto-optic modulator AOM2, delay fiber DF, second coupler OC2, first erbium-doped fiber amplifier EDFA1, circulator C, second erbium-doped fiber amplifier EDFA2, filter F, photoelectric Detector PD, data acquisition card DAQ, industrial computer IPC, and sound and vibration isolation device INS; among them, the narrow linewidth laser S emits continuous laser light; after passing through the first coupler OC1, it is evenly divided into two paths, and one path passes through the first acousto-optic Modulator AOM1 is...
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