Optical fiber grating-based monitoring system
A fiber grating and monitoring system technology, which is applied in the fields of optical fiber sensing technology, civil engineering, and rail transit, can solve the problems of a large number of fiber gratings, a complex structure, and an expensive demodulation system, and achieves low price, easy implementation, and simple production. Effect
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[0011] A fiber grating-based monitoring system, such as figure 1 . The output of its broadband light source 1 is connected to the first port 21 of the four-port circulator 2, and the second port 22 of the circulator is connected in series with the first to nth narrowband fiber Bragg gratings 31, 32..., 3n, and the first port of the circulator The three ports 23 are connected to one end of the broadband fiber grating 30 , the other end of the broadband fiber grating 30 is connected to the first photodetector 41 , and the fourth port 24 of the circulator is connected to the second photodetector 42 .
[0012] The wavelengths of the first to the nth narrowband fiber Bragg gratings are the same, but the reflectivity is different, where n≥2.
[0013] The wavelengths of the first to the nth narrowband fiber Bragg gratings adopt the existing range of 1500nm-1600nm, and the present invention uses any wavelength within this range, and the wavelengths are the same.
[0014] The reflect...
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