Dual-core fiber seismic geophone
A geophone, dual-core fiber technology, applied in seismic signal receivers, multi-layer core/clad fibers, clad fibers, etc. Electromagnetic interference and other problems, to achieve the effect of easy mass production, large dynamic range, and compact structure
Inactive Publication Date: 2013-06-19
XIAN JINHE OPTICAL TECH
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Problems solved by technology
The existing geophones are mainly designed and manufactured on the basis of electrical principles, including moving coil, eddy current, piezoelectric and other types. Their disadvantages are: susceptible to electromagnetic interference, low sensitivity, and small dynamic range, which cannot meet the requirements of actual engineering applications. and exploration needs
[0004] Chinese Patent Application No. 201110106427.6 "Fiber Optic Geophone" discloses a fiber geophone based on a tilted fiber grating, which has the advantages of compact structure, high sensitivity, and anti-electromagnetic interference, but its structure is complex, and the fiber grating is sensitive to wavelength , these lead to higher cost
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[0026] like figure 1 , figure 2 and image 3 A dual-core optical fiber geophone shown includes a housing 9, an elastic tube 6 is fixed inside the housing 9 through a support member 10, a part of the dual-core optical fiber 11 is encapsulated in the elastic tube 6, and is located in the housing 9. One end of the inner double-core optical fiber 11 is coated with a reflective film 7; the double-core optical fiber includes a cladding one 3 and a cladding two 4 positioned outside the cladding one 3, and a core one is arranged in the cladding one 3 1 and core two 2, the refractive index of said core one 1 and core two 2 is greater than the refractive index of cladding one 3, the refractive index of cladding one 3 is greater than the refractive index of cladding two 4, in the cladding The outer side of two 4 is protective layer 5, and the minimum distance between the surface of core one 1 and core two 2 is not more than 5 microns; Channel two, channel one and channel two are resp...
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The invention discloses a dual-core fiber seismic geophone which comprises a casing. An elastic tube is fixed inside the casing through a supporting member, a part of a dual-core fiber is sealed in the elastic tube, and a reflecting film is coated and covered at one end of the dual-core fiber inside the casing. The dual-core fiber comprises a first coating layer and a second coating layer, a first fiber core and a second fiber core are placed in the first coating layer, a refractive index of the first fiber core and the second fiber core is larger than that of the first coating layer, the refractive index of the first coating layer is larger than that of the second fiber core, a protecting layer is formed outside the second coating layer, and a minimum distance between the first fiber core and the second fiber core is not longer than 5 micrometers. The other end of the dual-core fiber is connected with a coupler, a first channel and a second channel are formed in the coupler, the first channel and the second channel are respectively connected with the first fiber core and the second fiber core of the dual-core fiber, and the other ends of the first channel and the second channel are respectively connected with a light source module and an optical detection module. The dual-core fiber seismic geophone is convenient to use and low in cost and has good application prospects.
Description
technical field [0001] The invention relates to a geophone, in particular to a dual-core optical fiber geophone. Background technique [0002] Seismic detectors are widely used in oil and gas exploration, monitoring and prevention of earthquake disasters, and security. The existing geophones are mainly designed and manufactured on the basis of electrical principles, including moving coil, eddy current, piezoelectric and other types. Their disadvantages are: susceptible to electromagnetic interference, low sensitivity, and small dynamic range, which cannot meet the requirements of actual engineering applications. and exploration needs. [0003] Compared with the existing electrical sensor technology, optical fiber sensing technology has the advantages of anti-electromagnetic interference, high sensitivity, large dynamic range, and easy construction of sensor networks or arrays, and has become a research and application hotspot. [0004] Chinese Patent Application No. 201110...
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Inventor 杜兵
Owner XIAN JINHE OPTICAL TECH