Optical fibre grating sensor
A fiber grating and sensor technology, applied in the field of sensing, can solve the problems of complex equipment and high maintenance costs
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no. 1 approach
[0024] figure 2 It is a block diagram showing the structure of the fiber grating sensor of the first embodiment. The fiber grating sensor of the first embodiment consists of a broadband light source 3, a photodetector 6, an optical splitter 4, a filter 10 with a fixed wavelength, a fiber grating 5 coated with metal palladium for monitoring hydrogen changes at the measurement point, and Optical fiber 7 constitutes. The components are connected by optical fibers. The optical splitter 4 can be a 2-way coupler or an optical circulator.
[0025] There is a preset difference between the wavelength band allowed by the filter 10 of fixed wavelength and the reflection wavelength of the fiber Bragg grating 5, and the detection optical signal output from the broadband light source 3 passes through the optical splitter 4 and the optical fiber 7, and reaches the fiber Bragg grating 5. The optical fiber grating 5 has a narrow-band optical reflection to the detection optical signal injec...
no. 2 approach
[0027] image 3 It is a block diagram showing the structure of the fiber grating sensor of the second embodiment. The fiber grating sensor of the second embodiment consists of a broadband light source 3, a photodetector 6a, a photodetector 6b, a photodetector 6n, an optical splitter 4, an optical splitter 9, a fixed-wavelength filter 10a, a fixed-wavelength The filter 10b, the filter 10n with a fixed wavelength, the optical fiber grating 5 coated with metal palladium and the optical fiber 7 located at the measurement point for monitoring the change of hydrogen are composed. The components are connected by optical fibers. The optical splitter 4 can be a 2-way coupler or an optical circulator.
[0028] The detection optical signal output from the broadband light source 3, the fiber grating 5 has a narrow-band optical reflection to the detection optical signal injected by the broadband light source 3, and the reflected optical signal passes through the optical splitter 4, the o...
no. 3 approach
[0030] Fig. 4 is a block diagram showing the configuration of a fiber grating sensor according to a third embodiment. The fiber grating sensor of the third embodiment consists of a broadband light source 3, a filter 10 with a fixed wavelength, a photodetector 6, an optical splitter 4, a fiber grating 5a coated with metal palladium for monitoring hydrogen changes at the measurement point, an optical fiber The grating 5b, the fiber grating 5n, and the optical fiber 7 are comprised. The components are connected by optical fibers. The optical splitter 4 can be a 2-way coupler or an optical circulator.
[0031]The detection optical signal output from the broadband light source 3 passes through the optical splitter 4 and the optical fiber 7, and reaches the fiber grating 5a, the fiber grating 5b, and the fiber grating 5n having substantially the same reflection wavelength band, and the filter 10 with a fixed wavelength allows it to pass There is a preset difference between the wav...
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