Single-ended Brillouin distributed-type sensing system of Brillouin adjustable frequency shifter structure, and sensing method
A sensing system and distributed technology, applied in the direction of using optical devices to transmit sensing components, instruments, measuring devices, etc., can solve problems such as increased system cost and inconvenience in use.
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[0037] refer to figure 1 , figure 2 , a single-ended Brillouin distributed sensing system with a Brillouin tunable frequency shifter structure, including:
[0038] Narrow linewidth laser 1, first optical coupler 2, erbium-doped fiber amplifier 3, second optical coupler 11, second optical circulator 12;
[0039] A signal processing unit 20, the signal processing unit 20 includes a photodetector 15 and a data acquisition and processing module 16 connected in sequence;
[0040] A single-ended structural unit 19, the single-ended structural unit 19 includes a sensing optical fiber 13 and an FC / PC optical connector 14 connected together;
[0041] A pulse modulation unit 18, the pulse modulation unit 18 is provided with a pulse modulator 10, and the pulse modulator 10 modulates the frequency-shifted continuous light into pulsed pump light;
[0042] Adjustable frequency shifting unit 17, the adjustable frequency shifting unit 17 includes the first optical circulator 4, the third op...
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