fiber optic geophone
A technology of geophones and optical fibers, applied in seismic signal receivers, clad optical fibers, optical waveguides, etc., can solve the problems of expensive demodulation equipment, susceptibility to electromagnetic interference, and high noise, and achieve easy multiplexing and networking , Low demodulation cost, simple device demodulation effect
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[0028] Example 1
[0029] Such as figure 1 As shown, in this embodiment, the optical fiber geophone includes a tilted fiber grating 1, a cladding-core energy recoupling structure 2, a polymer elastic tube 3, a supporting member 4, a housing 5 and an optical fiber wire 6; polymer One end of the elastic tube 3 is fixed on the supporting member 4, and the other end is suspended to sense vibration; the inclined fiber grating 1, the cladding-core energy recoupling structure 2 are all encapsulated in the polymer elastic tube 3; the outside of the polymer elastic tube 3 is The shell 5 is protected; the polymer elastic tube 3 is connected to an external light source and a photodetector through an optical fiber wire 6. The polymer elastic tube 3 protects the internally inclined optical fiber grating 1 while using its own high elasticity to effectively transmit environmental vibrations to the internal optical fiber.
[0030] Such as figure 2 As shown, the cladding-core energy re-coupling s...
Example Embodiment
[0035] Example 2
[0036] The structure of this embodiment is the same as that of embodiment 1 except for the following features: image 3 As shown, the cladding-core energy recoupling structure 2 is processed by the optical fiber tapering method. Among them, when the untapered cladding diameter is 125um, the fiber tapered diameter is controlled between 60-90um, which not only ensures sufficient cladding-core-mode coupling channel, but also avoids the fiber taper from being too thin and reducing its mechanical strength. Similarly, the taper position is as close as possible to the inclined fiber grating, with a typical spacing of 2 to 5 mm. In this embodiment, 3mm is selected. The size of the entire sensing probe is less than 15mm.
[0037] The tilted fiber grating 1 adopts a tilted grating, and the tilt angle of the grating is 4 degrees.
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