CN201464105U - Fiber grating osmometer - Google Patents
Fiber grating osmometer Download PDFInfo
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- CN201464105U CN201464105U CN2009200308873U CN200920030887U CN201464105U CN 201464105 U CN201464105 U CN 201464105U CN 2009200308873 U CN2009200308873 U CN 2009200308873U CN 200920030887 U CN200920030887 U CN 200920030887U CN 201464105 U CN201464105 U CN 201464105U
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- osmometer
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Abstract
The utility model discloses a fiber grating osmometer, which comprises a shell, a pressure bar, a grating and a transmission fiber, wherein the shell is provided with a pressure inlet and a fiber lead hole; the pressure inlet is provided with a filter screen; the shell is provided with a diaphragm; the diaphragm can directly feel a pressure at the pressure inlet; both ends of the pressure bar are connected with the diaphragm; the grating is embedded in the pressure bar; and the transmission fiber is led out by the fiber lead hole. The fiber grating osmometer is used in a mode that pore water enters the osmometer through the pressure inlet and acts on the diaphragm to enable the diaphragm to generate deflection deformation, and simultaneously the deflection deformation is transformed into a concentrated force to act on the pressure bar; the pressure bar is stretched by an external force so that a central wavelength of the grating is changed under the action of the pressure; and at the moment, the detection of the osmotic pressure can be realized by using a fiber grating demodulating instrument to detect the central wavelength of the grating and using software to acquire storage data. The fiber grating osmometer has the advantages of high measuring accuracy, small volume, excellent anti-electromagnetic interference capacity and waterproof property, capacity of long-term monitoring and the like.
Description
Technical field
The utility model relates to a kind of fiber bragg grating osmometer, belongs to the optical fiber grating sensing field.
Background technology
As everyone knows, one of the most difficult problem is exactly to determine the position of blowby area reliably in the safety monitoring in dam, tunnel and colliery, have only and verify seepage flow (leakage) position and flow fast and accurately, just can take effectively to take precautions against and reclamation activities, so seepage flow location and the monitoring of seepage flow quantification are significant.
Since the eighties in last century, drop into lot of manpower and material resources both at home and abroad, carried out the research of prison (inspection) survey technology of seepage location.Ultimate principle is to detect hidden danger and medium such as ground, concrete on every side whether to have tangible rerum natura (promptly electrical, elasticity, temperature etc.) difference, or the various responses that cause therefrom, overcomes background interference, and the physical abnormalities of hidden danger is detected.At present, more accurate seepage monitoring means mainly contain 2 kinds of methods: monitoring seepage pressure or monitoring seepage flow (M) amount.The monitoring of seepage flow is generally undertaken by the means such as the water yield that overflow at measurement gully, place, aperture, and normally interior in a big way seepage flow total amount is made location, vadose region, poor effect with it.Piezometric tube and osmometer observation seepage pressure is then mainly used in the monitoring of seepage pressure, because the precision of sensor is higher, therefore monitoring comparatively accurately and reliably.
At present, adopt electric class osmometer mostly, engineering practice shows that this type of osmometer volume is big, precision is not high, resolution is lower, to electrical quantity require very harsh, long-time stability are poor, and are subject to electromagnetic interference (EMI), seriously limited their widespread use.
Fiber grating is a kind of temperature and stress sensing device of function admirable, and since people are used for sensing to fiber grating, fiber-optic grating sensor has proposed brand-new challenge with its special advantages to traditional electric transducer etc.It compares especially unique advantage with traditional electric transducer etc.: 1. sensing head is simple in structure, volume is little, in light weight, be fit to also can imbed in the large scale structure attached to tested body structure surface, the stress of measurement structure inside, strain and structural damage etc., stability is high, good reproducibility; 2. and have natural compatibility between the optical fiber, easily be connected with optical fiber, low-loss, spectral characteristic is good, reliability is high; 3. have non-conducting, little to measured medium influence, have characteristics anticorrosive, anti-electromagnetic interference (EMI) again, be adapted near the coal gas, work in abominable under the power station, nuclear facilities, mine, around oil field and the oil tank etc., the high-risk environment; 4. optical fiber is lightly soft, can write a plurality of gratings in an optical fiber, constitutes sensor array, combines with multiplex techniques such as wavelength-division multiplex and time division multiplexes, realizes multiple spot, distributed sensing; 5. metrical information is a Wavelength-encoding, so fiber-optic grating sensor is not subjected to the influence of factors such as the light-intensity variation, fibre loss of light source, stronger antijamming capability is arranged; 6. high sensitivity, high degree of resolution.
A lot of research institutions have begun the research of optical fiber osmotic pressure sensor, and Wu Yonghong etc. have designed the reflective water conservancy project osmotic pressure of two optical-fiber types sensor, the measuring accuracy height, but design concept and manufacture craft are all very complicated; Utility models such as Tong Chengguo the reflective pressure transducers of two bellows, simple in structure, but range is little; Xia Yuanyou etc. have designed the fiber grating osmotic pressure sensor based on polyurethane elastomeric materials, and are applied in the civil engineering works such as highway soft foundation, but the repetition poor performance of resilient material.
Summary of the invention
At above-mentioned prior art, the utility model provides the fiber bragg grating osmometer that a kind of measuring accuracy height, volume are little, have good water resistance, and it can anti-electromagnetic interference (EMI), and can long term monitoring.
The utility model is achieved through the following technical solutions:
A kind of fiber bragg grating osmometer is characterized in that: comprise shell, press rods, grating, Transmission Fibers, wherein, shell is provided with entrance pressure mouth and fiber-optic wire hole, and entrance pressure mouth place is provided with screen pack, can effectively stop silt to enter in the osmometer; Shell is made up of left, center, right three parts, and left and right two parts and center section are by being threaded, and the center section both sides are provided with diaphragm, and diaphragm can directly be experienced the pressure at entrance pressure mouth place; The press rods two ends all are connected with diaphragm, and grating is embedded in the press rods, and Transmission Fibers is drawn by the fiber-optic wire hole.
Described diaphragm is welded on the shell.
Described grating is the Bragg grating.
Described press rods is bonded in the center of diaphragm by high-strength adhesive.
Described grating distributes along the axis of press rods, and the dilatation by the detected pressures bar detects the osmotic pressure value.
Described press rods is made by even matter resilient material, have stronger elasticity, and material is even, and is stressed even.
Use: pore water enters osmometer by the entrance pressure mouth, acts on the diaphragm, makes diaphragm generation deflection deformation, change into concentrated force simultaneously and act on the press rods, press rods be subjected to external force take place flexible, make grating under pressure centre wavelength change.Detect the centre wavelength of grating with fiber Bragg grating (FBG) demodulator this moment, and by software collection storage data, can realize the detection (fiber Bragg grating (FBG) demodulator is an equipment commonly used in the prior art, is not described in detail in this) of osmotic pressure.
The utility model does not have electron device based on full optical signal design, therefore has favorable waterproof property, does not have electric spark hidden danger, and anti-electromagnetic interference (EMI).The utility model has adopted two diaphragms, and has adopted the press rods of high tenacity, has improved measuring accuracy and measuring reliability.But the utlity model has advantages such as measuring accuracy height, little, the anti-electromagnetic interference (EMI) of volume, the good long term monitoring of water resistance.
Description of drawings
Fig. 1 is a structural representation of the present utility model;
Fig. 2 is the variation relation curve map of centre wavelength of the present utility model with pressure;
Fig. 3 is that centre wavelength of the present utility model is with the variation of temperature graph of relation.
Wherein, 1, shell; 2, diaphragm; 3, press rods; 4, grating; 5, entrance pressure mouth; 6, fiber-optic wire hole; 7, screen pack; 8, Transmission Fibers.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described:
A kind of fiber bragg grating osmometer as shown in Figure 1, comprises shell 1, press rods 3, grating 4, Transmission Fibers 8, and wherein, shell 1 is provided with entrance pressure mouth 5 and fiber-optic wire hole 6, and entrance pressure mouth 5 places are provided with screen pack 7, can effectively stop silt to enter in the osmometer; Shell 1 is made up of left, center, right three parts, and left and right two parts and center section are by being threaded, and the center section both sides are welded with diaphragm 2, and diaphragm 2 can directly be experienced the pressure at entrance pressure mouth 5 places; Press rods 3 two ends are bonded in the center of diaphragm 2 by high-strength adhesive, and grating 4 is embedded in the press rods 3, and grating 4 distributes along the axis of press rods 3, and the dilatation by detected pressures bar 3 detects the osmotic pressure value; Transmission Fibers 8 is drawn by fiber-optic wire hole 6.Described grating 4 is the Bragg grating.Described press rods 3 is made by even matter resilient material, have stronger elasticity, and material is even, and is stressed even.
Manufacturing process of the present utility model is: at first, grating 4 is embedded in the pressure guide rod 3, keeps the axis unanimity of the two; In second step, the two ends of pressure guide rod 3 are bonded in respectively on two diaphragms 2; In the 3rd step, diaphragm 2 is welded on the shell 1, and Transmission Fibers is drawn by fiber-optic wire hole 6; At last, the osmometer assembling is finished, and is sticked metal screen at entrance pressure mouth 5 places.
Use: pore water enters osmometer by entrance pressure mouth 5, act on the diaphragm 2, make diaphragm 2 that deflection deformation take place, its center produces the displacement of vertical diaphragm 2 directions, changing into concentrated force acts on the press rods 3, press rods 3 be subjected to external force take place flexible, make grating 4 under pressure centre wavelength change.Detect the centre wavelength of grating with fiber Bragg grating (FBG) demodulator this moment, and by software collection storage data, can realize the detection of osmotic pressure.
In order to realize the purpose of this utility model, at first under constant temperature osmometer is demarcated, the centre wavelength of grating 4 is with the variation relation of pressure, as shown in Figure 2, the linear relationship of center wavelength variation amount (nm) and pressure (KPa) be respectively y=0.0363x-0.1869 and, linearity R
2Be respectively 0.9945, this explanation the utility model is an extraordinary empirical model of the linearity, and has generality.
For pressure parameter being carried out the efficient temperature compensation, osmometer has been carried out temperature calibration, the centre wavelength of osmometer of the present utility model with the variation of temperature relation as shown in Figure 3, center wavelength variation amount (nm) and temperature (℃) linear relationship be respectively y=0.0113x-0.0201, linearity R
2Be respectively 0.9973.
In detecting at the scene, at first put a temperature sensor at this osmometer place, measure tested point variation of temperature situation, eliminate Temperature Influence according to centre wavelength of the present utility model with the variation of temperature relation again, can record the pressure changing of tested point at last with the variation relation of pressure according to centre wavelength of the present utility model.
By above measuring method, can make the accuracy of detection of fiber bragg grating osmometer reach 0.1%F.S, effectively improved the quality and the efficient that detect.
Claims (5)
1. fiber bragg grating osmometer, it is characterized in that: comprise shell (1), press rods (3), grating (4), Transmission Fibers (8), wherein, shell (1) is provided with entrance pressure mouth (5) and fiber-optic wire hole (6), and entrance pressure mouth (5) locates to be provided with screen pack (7); Shell (1) is made up of left, center, right three parts, and left and right two parts and center section are by being threaded, and the center section both sides are provided with diaphragm (2), and diaphragm can directly be experienced the pressure that entrance pressure mouth (5) is located; Press rods (3) two ends all are connected with diaphragm (2), and grating (4) is embedded in the press rods (3), and Transmission Fibers (8) is drawn by fiber-optic wire hole (6).
2. a kind of fiber bragg grating osmometer according to claim 1 is characterized in that: described diaphragm (2) is welded on the shell (1).
3. a kind of fiber bragg grating osmometer according to claim 1 is characterized in that: described grating (4) is the Bragg grating.
4. a kind of fiber bragg grating osmometer according to claim 1 is characterized in that: described press rods (3) is bonded in the center of diaphragm (2) by high-strength adhesive.
5. a kind of fiber bragg grating osmometer according to claim 1 is characterized in that: described grating (4) distributes along the axis of press rods (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200308873U CN201464105U (en) | 2009-08-05 | 2009-08-05 | Fiber grating osmometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200308873U CN201464105U (en) | 2009-08-05 | 2009-08-05 | Fiber grating osmometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201464105U true CN201464105U (en) | 2010-05-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200308873U Expired - Fee Related CN201464105U (en) | 2009-08-05 | 2009-08-05 | Fiber grating osmometer |
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| Country | Link |
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| CN (1) | CN201464105U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105888651A (en) * | 2016-04-28 | 2016-08-24 | 安徽蓝海之光科技有限公司 | Mining online pressure-measuring device based on optical fiber |
| CN108444637A (en) * | 2018-03-17 | 2018-08-24 | 河南理工大学 | Optical Fiber Sensing Array for coal-bed gas dynamic pressure measurement |
-
2009
- 2009-08-05 CN CN2009200308873U patent/CN201464105U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105888651A (en) * | 2016-04-28 | 2016-08-24 | 安徽蓝海之光科技有限公司 | Mining online pressure-measuring device based on optical fiber |
| CN108444637A (en) * | 2018-03-17 | 2018-08-24 | 河南理工大学 | Optical Fiber Sensing Array for coal-bed gas dynamic pressure measurement |
| CN108444637B (en) * | 2018-03-17 | 2020-03-31 | 河南理工大学 | Optical fiber sensing array for coal bed gas dynamic pressure measurement |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20100512 Termination date: 20110805 |