CN101625273B - Fiber bragg grating osmometer - Google Patents
Fiber bragg grating osmometer Download PDFInfo
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- CN101625273B CN101625273B CN2009100175594A CN200910017559A CN101625273B CN 101625273 B CN101625273 B CN 101625273B CN 2009100175594 A CN2009100175594 A CN 2009100175594A CN 200910017559 A CN200910017559 A CN 200910017559A CN 101625273 B CN101625273 B CN 101625273B
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Abstract
本发明公开了一种光纤光栅渗压计，包括外壳、压力杆、光栅、传输光纤，其中，外壳上设有进压口和光纤引线孔，进压口处设有过滤网；外壳上设有膜片，膜片可以直接感受进压口处的压力；压力杆两端均与膜片连接，光栅埋设在压力杆中，传输光纤由光纤引线孔引出。使用：孔隙水通过进压口进入渗压计，作用在膜片上，使膜片发生挠度变形，同时转化成集中力作用在压力杆上，压力杆受到外力发生伸缩，使光栅在压力作用下中心波长发生变化。此时用光纤光栅解调仪检测光栅的中心波长，并由软件采集存储数据，即可实现渗压的检测。本发明具有测量精度高、体积小、抗电磁干扰、防水性能好、可长期监测等优点。
The invention discloses an optical fiber grating osmometer, which comprises a casing, a pressure rod, a grating, and a transmission optical fiber, wherein the casing is provided with a pressure inlet and an optical fiber lead hole, and a filter net is arranged at the pressure inlet; the casing is provided with a Diaphragm, the diaphragm can directly feel the pressure at the pressure inlet; both ends of the pressure rod are connected to the diaphragm, the grating is buried in the pressure rod, and the transmission optical fiber is drawn out from the fiber lead hole. Use: Pore water enters the piezometer through the pressure inlet and acts on the diaphragm to cause deflection and deformation of the diaphragm. At the same time, it is converted into a concentrated force and acts on the pressure rod. The pressure rod expands and contracts under the external force, so that the grating is under pressure. The center wavelength changes. At this time, the optical fiber grating demodulator is used to detect the center wavelength of the grating, and the software collects and stores the data to realize the detection of the osmotic pressure. The invention has the advantages of high measurement precision, small size, anti-electromagnetic interference, good waterproof performance, long-term monitoring and the like.
Description
Technical field
The present invention relates to a kind of fiber bragg grating osmometer, belong 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; Tong Chengguo etc. have invented the reflective pressure transducer of two bellows, and are 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 invention provides the fiber bragg grating osmometer that a kind of measuring accuracy height, volume are little, have good water resistance, it can anti-electromagnetic interference (EMI), and can long term monitoring.
The present invention is achieved by 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 present invention is based on full optical signal design, do not have electron device, therefore have favorable waterproof property, do not have electric spark hidden danger, and anti-electromagnetic interference (EMI).The present invention has adopted two diaphragms, and has adopted the press rods of high tenacity, has improved measuring accuracy and measuring reliability.But the present invention 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 invention;
Fig. 2 is the variation relation curve map of centre wavelength of the present invention with pressure;
Fig. 3 is that centre wavelength of the present invention 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
The present invention is further illustrated below in conjunction with drawings and Examples:
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 invention 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 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 purpose of the present invention, 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 present invention 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 invention with 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, centre wavelength according to the present invention is again eliminated Temperature Influence with variation of temperature relation, at last can centre wavelength according to the present invention records the pressure changing of tested point with the variation relation of pressure.
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 (4)
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); Described grating (4) distributes along the axis of press rods (3), and the dilatation by detected pressures bar (3) detects the osmotic pressure value; Described press rods (3) is made by even matter resilient material.
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100175594A CN101625273B (en) | 2009-08-05 | 2009-08-05 | Fiber bragg grating osmometer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100175594A CN101625273B (en) | 2009-08-05 | 2009-08-05 | Fiber bragg grating osmometer |
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| Publication Number | Publication Date |
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| CN101625273A CN101625273A (en) | 2010-01-13 |
| CN101625273B true CN101625273B (en) | 2011-09-14 |
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| CN2009100175594A Expired - Fee Related CN101625273B (en) | 2009-08-05 | 2009-08-05 | Fiber bragg grating osmometer |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101936792A (en) * | 2010-09-27 | 2011-01-05 | 山东大学 | Mining Fiber Bragg Grating Negative Pressure Sensor |
| CN102252901B (en) * | 2011-04-15 | 2012-12-12 | 中国水利水电第七工程局有限公司 | Tightening device communicated with multiple osmometers |
| CN103267547B (en) * | 2013-04-27 | 2015-11-18 | 昆明理工大学 | A kind of microflow sensor based on optical fiber Bragg raster counting |
| CN103542974B (en) * | 2013-10-24 | 2016-01-20 | 昆明理工大学 | A kind of piston type diamond structure optical fiber Bragg raster osmotic pressure sensor and using method thereof |
| CN104792453A (en) * | 2014-01-21 | 2015-07-22 | 周峰 | High-sensitivity fiber Bragg grating water seepage pressure sensor |
| CN104792267B (en) * | 2014-01-21 | 2018-06-22 | 周峰 | Fiber grating displacement sensor |
| NL2015952B1 (en) * | 2015-12-11 | 2017-07-03 | Fugro Tech Bv | Pressure sensor and sensor system comprising one or more pressure sensors. |
| CN110617798A (en) * | 2019-10-16 | 2019-12-27 | 辽宁大学 | Monitoring tube structure for tailing dam infiltration line and distribution thereof |
| CN115950486A (en) * | 2023-02-16 | 2023-04-11 | 大连理工大学 | An integrated monitoring device and method for dam deformation and seepage based on distributed optical fiber |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2427910A (en) * | 2005-07-02 | 2007-01-10 | Sensor Highway Ltd | Fiber optic temperature and pressure sensor and system incorporating same |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2427910A (en) * | 2005-07-02 | 2007-01-10 | Sensor Highway Ltd | Fiber optic temperature and pressure sensor and system incorporating same |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2008-107295A 2008.05.08 |
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