Distributed optical fiber sound wave and vibration fusion type sensing system
A distributed optical fiber, sensing system technology, applied in the measurement of ultrasonic/sonic/infrasonic waves, the use of wave/particle radiation, measurement devices, etc., can solve problems such as single vibration or acoustic wave sensing, to achieve cost savings, flexible operation, Easy-to-use effects
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Embodiment 1
[0023] A distributed optical fiber acoustic wave and vibration fusion sensing system of the present invention, its structure includes a laser 1, a 1×2 optical fiber coupler 2, an acousto-optic modulator 3, an erbium-doped optical fiber amplifier 4, a first optical fiber filter 5, Optical fiber circulator 6, first optical switch, optical fiber Raman amplifier 8, second optical switch 9, second optical fiber filter 10, 3×3 optical fiber coupler 11, first photodetector 12, second photodetector 13 , the third photodetector 14, data acquisition and processing unit 15, computer 16, host computer software 17;
[0024] The laser 1, the 1×2 fiber coupler 2, the acousto-optic modulator 3, the erbium-doped fiber amplifier 4, the first fiber filter 5, the fiber circulator 6, the first optical switch, and the fiber Raman amplifier 8 pass through a single mode optical fiber, the optical fiber circulator 6, the second optical fiber filter 10, the 3×3 optical fiber coupler 11, the first photo...
Embodiment 2
[0044] Compared with Embodiment 1, the difference is that the laser 1 is a narrow linewidth laser.
[0045] All the other contents are the same as in Example 1.
Embodiment 3
[0047] Compared with Embodiment 2, the difference is that the power splitting ratio of the 1×2 fiber coupler 2 is 1:99, and the output power ratio of the first output port of the 1×2 fiber coupler 2 is 99. %, the output power ratio of the second output port of the 1×2 fiber coupler 2 is 1%.
[0048] All the other contents are identical with embodiment 2.
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