CN202066638U - Apparatus realizing hydraulic sensing based on double-core and double-hole optical fiber - Google Patents
Apparatus realizing hydraulic sensing based on double-core and double-hole optical fiber Download PDFInfo
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- CN202066638U CN202066638U CN2011201306726U CN201120130672U CN202066638U CN 202066638 U CN202066638 U CN 202066638U CN 2011201306726 U CN2011201306726 U CN 2011201306726U CN 201120130672 U CN201120130672 U CN 201120130672U CN 202066638 U CN202066638 U CN 202066638U
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Abstract
The utility model discloses an apparatus realizing hydraulic sensing based on double-core and double-hole optical fiber. In the prior apparatus utilizing optical fiber to realize hydraulic sensing, the problems exist that the sensitivity is low, the sensing optical fiber is too long, etc. The utility model includes a broadband light source, two segments of single-mode optical fiber, one segment of double-core and double-hole optical fiber, and a spectrum analyzer. The output port of the broadband light source is connected with the input port of the single-mode optical fiber through optical fiber; the output port of the segment of single-mode optical fiber is butt-connected to one fiber core of the double-core and double-hole optical fiber; the other core in the double-core and double-hole optical fiber is butt-connected to the input port of the other segment of single-mode optical fiber; and the output port of the other segment of single-mode optical fiber is connected with the input port of the spectrum analyzer through optical fiber. The utility model possesses the advantages that electromagnetic interference is eliminated, remote sensing can be realized, the price is low, the structure is compact, the sensitivity is high, etc.
Description
Technical field
The utility model belongs to technical field of optical fiber sensing, particularly a kind of device of realizing hydraulic sensing based on twin-core diplopore optical fiber.
Background technology
Because optical fiber not only can be used as the transmission medium of light wave, and when light wave transmits in optical fiber, meetings such as its characteristic parameter amplitude, phase place, polarization state, wavelength because of extraneous factor such as temperature, pressure, strain, magnetic field, electric field, the displacement equivalence connects or change indirectly, thereby optical fiber can be surveyed physical quantity as sensing element.Optical fiber sensing technology is exactly to utilize the characteristic of optical fiber to some physical quantity sensitivity, external physical quantity is converted to the technology of the signal that can directly measure.Optical fiber sensing technology is one of of paramount importance sensing technology of optical field, has been widely used in fields such as biology, medical science, space flight, aviation, machinery, petrochemical industry, building, high ferro, bridge, national defense industry.
Utilize detection that optical fiber sensing technology realizes physical quantitys such as temperature, stress, refractive index comparative maturity, and realize that the technology of hydraulic sensing is immature relatively.The optical fiber sensing technology of realizing hydraulic sensing at present has Fiber Bragg Grating FBG hydraulic sensing technology and special optical fiber hydraulic sensing technology.The former need write Fiber Bragg Grating FBG on general single mode fiber, utilize Fiber Bragg Grating FBG that the wave length shift of hydraulic pressure is detected the realization hydraulic sensing.Because Fiber Bragg Grating FBG is insensitive to the hydraulic pressure influence, this technical scheme exists the shortcoming of muting sensitivity.The report of at present relevant special optical fiber hydraulic sensing technology mainly is to utilize existing commercial photonic crystal fiber to realize hydraulic sensing, exists shortcomings such as sensitivity is low, sensor fibre is long.Therefore, invention is a kind of significant based on optical fiber, cheap, compact conformation, highly sensitive hydraulic sensing device.
Summary of the invention
The utility model is at the deficiencies in the prior art, proposed a kind of device of the detection hydraulic pressure signal based on twin-core diplopore optical fiber.
The technical scheme that the utility model technical solution problem is taked is:
The device of realizing hydraulic sensing based on twin-core diplopore optical fiber comprises a wideband light source, two section single-mould fibers, one section twin-core diplopore optical fiber and a spectroanalysis instrument.The output port of wideband light source is connected with the input port fiber of a section single-mould fiber; The output port of this section single-mould fiber is connected in the fused fiber splice mode with the input port of twin-core diplopore optical fiber, a fibre core butt joint of the fibre core of this section single-mould fiber and twin-core diplopore optical fiber; The output port of twin-core diplopore optical fiber and the input port of another section single-mould fiber are connected in the fused fiber splice mode, another fibre core of twin-core diplopore optical fiber and the butt joint of the fibre core of this section single-mould fiber; The output port of single-mode fiber is connected with the input port fiber of spectroanalysis instrument;
It is the airport that 10～30 microns fibre core and two centre distance are 50～100 microns that two centre distance are arranged in the described twin-core diplopore cross section of optic fibre, line quadrature between the line between the fibre core center of circle and the airport center of circle, the size of airport is 30～50 microns, the external diameter of twin-core diplopore optical fiber is the same with the external diameter of single-mode fiber, and size, the doping content of two fibre cores of twin-core diplopore optical fiber are the same with the single-mode fiber fibre core.
Utilize the utility model to realize that the method for hydraulic measurement may further comprise the steps:
Step (1) selects an output wavelength to cover 1525nm to 1560nm wideband light source, two sections spectroanalysis instruments that are operated in the single-mode fiber of 1550nm wave band, one section twin-core diplopore optical fiber and an operation wavelength covering 1525nm to 1560nm;
Step (2) is connected the output port of wideband light source and the input port fiber of a section single-mould fiber; The output port of this single-mode fiber and the input port of twin-core diplopore optical fiber are connected a fibre core butt joint of the fibre core of this single-mode fiber and twin-core diplopore optical fiber in the fused fiber splice mode; The output port of twin-core diplopore optical fiber and the input port of another section single-mould fiber are connected another fibre core of twin-core diplopore optical fiber and the butt joint of the fibre core of this section single-mould fiber in the fused fiber splice mode; The output port of single-mode fiber and the input port fiber of spectroanalysis instrument are connected;
Step (3) is inserted twin-core diplopore optical fiber the liquid environment that needs to measure hydraulic pressure.Two patterns of odd mould of twin-core diplopore optical fiber and even mould, their effective refractive index is poor
Be the hydraulic pressure that is added on the twin-core diplopore optical fiber
And operation wavelength
Function.According to coupled mode theory, when broadband light injection length is
Fibre core of twin-core diplopore optical fiber the time, the transmitted spectrum that comes out from the another one fibre core is:
When being applied to hydraulic pressure on the twin-core diplopore optical fiber and changing, transmitted spectrum is to having a wave length shift, its hydraulic pressure
And wave length shift
Satisfy following relation
Wherein
KBe constant, can utilize transmitted spectrum to calculate.Therefore, can determine to be applied to hydraulic pressure on the twin-core diplopore optical fiber by the wave length shift of measuring transmitted spectrum.
The utility model mainly is applicable to the hydraulic pressure of measuring in the liquid, has utilized twin-core diplopore optical fiber output spectrum with the characteristic that hydraulic pressure changes, and determines the hydraulic pressure numerical values recited by the wave length shift of output spectrum, has realized hydraulic sensing.Owing to adopt optical fiber as sensor information, the utlity model has and not be subjected to electromagnetic interference (EMI), can realize remote recording, cheap, compact conformation, high sensitivity this etc. advantage.
Description of drawings
Fig. 1 is a structural representation of the present utility model;
Fig. 2 is a twin-core diplopore optical fiber schematic cross-section;
Fig. 3 is a result schematic diagram of utilizing the utility model measurement device gained.
Embodiment
As depicted in figs. 1 and 2, realize that based on twin-core diplopore optical fiber the device of hydraulic sensing comprises a wideband light source 1, a section single-mould fiber 2, one section twin-core diplopore optical fiber 3, another section single-mould fiber 4 and spectroanalysis instrument 5.
The output port of wideband light source 1 and the input port fiber of single-mode fiber 2 are connected; The output port of single-mode fiber 2 and the input port of twin-core diplopore optical fiber 3 are connected a fibre core butt joint of the fibre core of single-mode fiber 2 and twin-core diplopore optical fiber 3 in the fused fiber splice mode; The output port of twin-core diplopore optical fiber 3 and the input port of another section single-mould fiber 4 are connected another fibre core of twin-core diplopore optical fiber 3 and the butt joint of the fibre core of single-mode fiber 4 in the fused fiber splice mode; The output port of single-mode fiber 4 and the input port fiber of spectroanalysis instrument 5 are connected.It is H(10～30 micron that two distances are arranged on orthogonal directions in the xsect 6 of twin-core diplopore optical fiber 3) fibre core, its size, refractive index are consistent with the single-mode fiber fibre core; It is L(50～100 micron that two distances are arranged in the xsect 6 of twin-core diplopore optical fiber 3 in the horizontal direction) air scoop, its diameter is D(30～50 micron).
Utilize the hydraulic sensing method of this pick-up unit may further comprise the steps:
(1) single-mode fiber of selecting an output wavelength to cover 1525nm to 1560nm wideband light source 1, a section to be operated in the 1550nm wave band 2, one section twin-core diplopore optical fiber that is operated in the 1550nm wave band 3, one section single-mode fiber 4 that is operated in the 1550nm wave band and operation wavelength cover the spectroanalysis instrument 5 of 1525nm to 1560nm.
(2) output port of wideband light source 1 and the input port fiber of single-mode fiber 2 are connected; The output port of single-mode fiber 2 and the input port of twin-core diplopore optical fiber 3 are connected a fibre core butt joint of the fibre core of single-mode fiber 2 and twin-core diplopore optical fiber 3 in the fused fiber splice mode; The output port of twin-core diplopore optical fiber 3 and the input port of another section single-mould fiber 4 are connected another fibre core of twin-core diplopore optical fiber 3 and the butt joint of the fibre core of single-mode fiber 4 in the fused fiber splice mode; The output port of single-mode fiber 4 and the input port fiber of spectroanalysis instrument 5 are connected.
(3) twin-core diplopore optical fiber 3 is inserted the liquid environment that needs to measure hydraulic pressure.Open wideband light source 1, the transmitted spectrum of exporting from twin-core diplopore optical fiber is:
Can determine hydraulic pressure change amount from this output transmitted spectrum spectrum
And wave length shift
Relation
By measuring wave length shift
Can detect the size of hydraulic pressure.Concrete measurement result as shown in Figure 3.
The utility model has utilized the special optical fiber technology that has just been grown up in recent years, and the twin-core diplopore optical fiber by reasonable in design utilizes the characteristic of its Mode Coupling to the hydraulic pressure sensitivity, has proposed the new solution of optical fiber hydraulic sensing.The utility model adopts optical fiber as sensor information, have the electromagnetic interference (EMI) of not being subjected to, can realize remote recording, cheap, compact conformation, high sensitivity this etc. advantage.
Claims (1)
1. realize the device of hydraulic sensing based on twin-core diplopore optical fiber, comprise a wideband light source, two section single-mould fibers, one section twin-core diplopore optical fiber and a spectroanalysis instrument, it is characterized in that: the output port of wideband light source is connected with the input port fiber of a section single-mould fiber; A fibre core butt joint in the output port of this section single-mould fiber and the twin-core diplopore optical fiber; Another fibre core in the twin-core diplopore optical fiber and the butt joint of the input port of another section single-mould fiber; The output port of another section single-mould fiber is connected with the input port fiber of spectroanalysis instrument;
It is the airport that 10～30 microns fibre core and two centre distance are 50～100 microns that two centre distance are arranged in the described twin-core diplopore cross section of optic fibre, line quadrature between the line between the fibre core center of circle and the airport center of circle, the size of airport is 30～50 microns, and the external diameter of twin-core diplopore optical fiber is the same with the external diameter of single-mode fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201306726U CN202066638U (en) | 2011-04-28 | 2011-04-28 | Apparatus realizing hydraulic sensing based on double-core and double-hole optical fiber |
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| CN2011201306726U CN202066638U (en) | 2011-04-28 | 2011-04-28 | Apparatus realizing hydraulic sensing based on double-core and double-hole optical fiber |
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| CN202066638U true CN202066638U (en) | 2011-12-07 |
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| CN2011201306726U Expired - Fee Related CN202066638U (en) | 2011-04-28 | 2011-04-28 | Apparatus realizing hydraulic sensing based on double-core and double-hole optical fiber |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106773014A (en) * | 2016-12-12 | 2017-05-31 | 南京大学 | A kind of compound double cavity structure for improving optical fiber hydrostatic sensor sensitivity |
-
2011
- 2011-04-28 CN CN2011201306726U patent/CN202066638U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106773014A (en) * | 2016-12-12 | 2017-05-31 | 南京大学 | A kind of compound double cavity structure for improving optical fiber hydrostatic sensor sensitivity |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111207 Termination date: 20130428 |