Slope-assisted Brillouin fiber sensing vibration measuring device and measuring method of fixable frequency shifting structure
A technology for optical fiber sensing and vibration measurement, which is used in measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., to reduce costs, facilitate operation, and measure long distances.
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[0039] refer to figure 1 , figure 2 , a slope-assisted Brillouin fiber sensing vibration measurement device with a fixed frequency shift structure, including a narrow linewidth laser 1, a first optical coupler 2, an erbium-doped fiber amplifier 3, a second optical coupler 10, a second optical circulator 11;
[0040] The fixed frequency shift unit 16, the fixed frequency shift unit 16 includes the first optical circulator 4 and the third optical coupler 8 connected in sequence by the c port of the first optical circulator 4, an optical isolator 7, a polarization control 6, single-mode optical fiber 5, wherein the optical isolator 7 is connected to the output end of the third optical coupler 8, one end of the single-mode optical fiber 5 is connected to the polarization controller 6, and the other end of the single-mode optical fiber 5 is connected to The b port of the first optical circulator 4;
[0041] A pulse modulation unit 17, the pulse modulation unit 17 is provided wi...
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