Cladding Fiber Bragg Grating Vibration Sensor
A fiber grating and sensor technology, applied in the field of sensors, can solve the problem of not realizing accurate identification of vibration direction and the like
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Embodiment 1
[0018] exist figure 1 Among them, the cladding fiber grating vibration sensor of the present embodiment consists of a semiconductor laser 1, a fiber circulator 2, a fiber grating sensor 3, an oscilloscope 4, a fiber core grating photodetector 5, a cladding grating photodetector 6, a fiber optic wave The multiplexer 7 is connected to form.
[0019] The semiconductor laser 1 is connected to the fiber circulator 2 through a single-mode fiber, and the laser light with a wavelength of 1520-1620nm generated by the semiconductor laser 1 is output to the fiber circulator 2 through the single-mode fiber, and the fiber circulator 2 is connected to the fiber grating sensor 3 and The optical fiber wavelength division multiplexer 7 is connected, the semiconductor laser 1 provides laser light for the fiber grating sensor 3 and the optical fiber wavelength division multiplexer 7, and the optical fiber wavelength division multiplexer 7 passes the single-mode optical fiber and the fiber core g...
Embodiment 2
[0022] In this embodiment, the end of the single-mode optical fiber is fused with a thin-core optical fiber 3-2, a core grating 3-4 is written on the core of the thin-core optical fiber 3-2, and a cladding grating 3-4 is written on the fiber cladding. 3. The wavelength of the core grating 3-4 is 1520nm, the wavelength of the cladding grating 3-3 is 1512nm, the length of the cladding grating 3-3 is equal to the length of the fiber core grating 3-4, and the cladding grating 3-3 and The fiber core gratings 3-4 are arranged in parallel at the same axial length position. Other components and the coupling relationship of the components are the same as in Embodiment 1.
Embodiment 3
[0024] In this embodiment, the end of the single-mode optical fiber is fused with a thin-core optical fiber 3-2, the core of the thin-core optical fiber 3-2 is engraved with a core grating 3-4, and the fiber cladding is engraved with a cladding grating 3 -3, the cladding grating 3-3 is engraved on the fiber cladding, the wavelength of the core grating 3-4 is 1620nm, the wavelength of the cladding grating 3-3 is 1612nm, the length of the cladding grating 3-3 is the same as that of the core grating 3-4 are equal in length, and the cladding grating 3-3 and the fiber core grating 3-4 are arranged in parallel at the same axial length position. Other components and the coupling relationship of the components are the same as in Embodiment 1.
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