CN104792453A - High-sensitivity fiber Bragg grating water seepage pressure sensor - Google Patents
High-sensitivity fiber Bragg grating water seepage pressure sensor Download PDFInfo
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- CN104792453A CN104792453A CN201410025365.XA CN201410025365A CN104792453A CN 104792453 A CN104792453 A CN 104792453A CN 201410025365 A CN201410025365 A CN 201410025365A CN 104792453 A CN104792453 A CN 104792453A
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- seepage pressure
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Abstract
The invention discloses a high-sensitivity fiber Bragg grating water seepage pressure sensor, which mainly comprises a fiber Bragg grating, a high-elastic alloy wire, a connecting piece 1, a connecting piece 2, a water inlet hole, metal elastic pieces and a metal packaging shell, wherein the metal packaging shell is connected with the metal elastic pieces, one end of the metal packaging shell is provided with the water inlet hole, and the other end is provided with a fiber outlet; the high-elastic alloy wire and the metal elastic piece are connected through the connecting piece 1; and the fiber Bragg grating is connected with the high-elastic alloy wire through the connecting piece 2. The fiber Bragg grating water seepage pressure sensor has the beneficial effects that variations in water pressure can be monitored accurately, the safety is good, the measurement range is large, the sensitivity and the precision are high, the long-time stability is good, the structural size is small, the weight is light, and the linearity conforms to engineering requirements.
Description
Technical field
The invention belongs to technical field of electronic measurement, specifically a kind of Reed-type Monitoring-fiber Bragg Grating seepage pressure sensor, it has very important significance to hydraulic engineering health monitoring.
Background technology
Sensor technology, the communication technology and computer technology are three large pillars of modern information technologies.Along with informationalized development, the transmission of information, acquisition and process have been called the extremely important ingredient of modern society.Along with the development of industrial technology, in application, the requirement of sensor is progressively improved, require that sensor has high precision, high sensitivity and range widely, in addition, also need to possess the ability that digitizing or linearization export.
The fast development of optical fiber communication accelerates the application of Fibre Optical Sensor at engineering field.Wherein, the performance of fiber-optic grating sensor is particularly outstanding, is the Fibre Optical Sensor that the widest frequency of usable range is the highest.Fibre Optical Sensor also comprises fibre optic current sensor, fibre optic hydrophone and optical fibre gyro.Compared with traditional sensor, fiber-optic grating sensor has the advantage of oneself uniqueness: electromagnetism interference, corrosion-resistant, chemical property are extremely stable, excellent insulation performance; Sensor construction dexterity is light, geometric configuration is plastic, be applicable to the little lightweight application scenario of ask for something sensor bulk, composite element and building can be imbedded inner, continuous real-time monitoring is carried out to the integrality of structure, security, load fatigue, degree of injury; Loss is little, can realize long-distance remote control monitoring; Preparing grating is convenient, does not have drift, without the need to periodic verification after dispatching from the factory; The write technical maturity of fiber grating, is convenient to large-scale production and commercialization.But also possess weak point: packaging technology is complicated, counter stress and temperature simultaneously responsive and be subject to the restriction of the demodulation techniques of transducing signal, wavelength demodulation device is needed to carry out demodulation to the signal of fiber grating, the (FBG) demodulator of demodulation accuracy and spectrometer price can be reached costly, make cost up, and general spectrometer cannot reach demodulation accuracy.
The design concept of fiber grating seepage pressure sensor is that fiber grating under the effect of the pressure, and wavelength value change is linear with pressure size.It is one of measure the item the most basic in measuring technique that water pressure detects, and is the basis of multiple physical quantity.Electricity seepage pressure sensor has itself deficiency, and as anti-electromagnetic interference capability is poor, be easily affected by the external environment, fiber grating seepage pressure sensor does not then affect by it as a kind of novel intelligent sensor.Due to the many merits of fiber grating, fiber-optic grating sensor not only for the industry of high-end army, and gradually achieves commercialization and carries out producing in batches to meet the need of market.
The method of existing many manufacture fiber bragg grating pressure sensors, as grating being pasted onto on planar diaphragm or metal shell, hydraulic pressure acts on diaphragm or this metal shell, make it that microdeformation occur, thus fiber grating is compressed or stretches to cause the centre wavelength of fiber grating to change, the result of actual pressure is obtained by the variable quantity of wavelength.Some are the thin-wall tubular structures by complexity in addition.Although it is high that these sensors have precision, electromagnetism interference, can advantages such as distributed measurements, but also Shortcomings part: planar diaphragm is in elastic range, and linear characteristic is very excellent, but amount of deflection can not be excessive, otherwise linear characteristic can rapidly disappear.Simultaneously, if fiber grating directly sticks with glue on planar diaphragm, easy generation stress concentrates or grating generation chirp phenomenon, wavelength instantaneous offsets and adhesive curing on planar diaphragm, different with state during theory calculate, also can make its discontinuity by small change diaphragm structure.In addition, some mechanisms are complicated, there is larger alignment error, and lag error is obviously and due to thin cylinder material under high pressure elastic modulus instability and the poor linearity that causes.
Summary of the invention
The present invention is directed to deficiency of the prior art carry out Curve guide impeller on this basis, provide that a kind of precision is high, measurement range wide, good stability, highly sensitive fiber grating seepage pressure sensor.The present invention, mainly for deficiency of the prior art improving on this basis, changes fiber grating stretch-draw into high-elastic B alloy wire and hydraulic pressure acts on another two pieces of planar diaphragms transmits between planar diaphragm.
The present invention is realized by following technical measures: this fiber grating seepage pressure sensor by optical fiber Bragg raster, metallic elastic sheet, high-elastic B alloy wire, lead in/out optical fiber, web member 1, web member 2, inlet opening, metal-packaged shell form; Metallic elastic sheet contacts with fluid pressure environment facies and passes through web member 1 and is connected with high-elastic B alloy wire, external pressure changes and causes metallic elastic sheet to deform, displacement transfer is given high-elastic B alloy wire by web member 1 by metallic elastic sheet, thus results through web member 2 optical fiber Bragg raster be fixed on high-elastic B alloy wire and produce corresponding wavelength-shift; Metallic elastic sheet is fixed on metal-packaged shell and defines an enclosed cavity, has ensured that the high-elastic B alloy wire be arranged in chamber only bears the pressure effect from metallic elastic sheet; Under pressure, wavelength value change is linear with pressure size for fiber grating; Lead in/out optical fiber respectively with two client links of two optical fiber Bragg rasters of connecting, be connected with signal processing apparatus light to realize sensing grating.
Aforesaid fiber grating seepage pressure sensor, is characterized in that: above-mentioned metallic elastic sheet number is 2.
Aforesaid fiber grating seepage pressure sensor, is characterized in that: above-mentioned metallic elastic sheet is the thin slice that stainless steel or invar are made.
Aforesaid fiber grating seepage pressure sensor, is characterized in that: above-mentioned metallic elastic sheet not direct being connected with fiber grating carries out pressure transmission, and fiber grating is connected with high-elastic B alloy wire.
Aforesaid fiber grating seepage pressure sensor, is characterized in that: high-elastic B alloy wire adopts stainless steel wire or beryllium-bronze silk.
Aforesaid fiber grating seepage pressure sensor, is characterized in that: adopt web member 1 to be connected between high-elastic B alloy wire with metallic elastic sheet.
Aforesaid fiber grating seepage pressure sensor, is characterized in that: the fiber grating in above-mentioned metal-packaged shell does not directly contact with monitored liquid.
Aforesaid fiber grating seepage pressure sensor, is characterized in that: fiber grating is in tensioning state all the time.
Beneficial effect of the present invention can be learnt according to describing of such scheme: adopt fiber grating as sensing element, overcomes traditional electrical sensor easily by shortcomings such as electromagnetic interference (EMI), long-time stability differences; In addition, because optical fiber Bragg raster is fixed on high-elastic B alloy wire, avoid on the one hand be pasted onto grating on planar diaphragm because of membrane strains difference warbling of producing; Meanwhile, by selecting high-elastic B alloy wire characteristic index (such as: length and diameter) adjust measurement sensistivity and measure range.Grating of the present invention is placed in annular seal space, avoids directly contacting with testing liquid and the range of sensor can reach 250m, is highly suitable for the pressure monitoring of hydraulic engineering.Therefore the present invention compared with prior art, achieves technical purpose.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Fig. 1 is that master of the present invention looks diagrammatic cross-section.
Fig. 2 is that diagrammatic cross-section is looked in survey of the present invention.
Fig. 3 is top cross-sectional view of the present invention.
Fig. 4 is 250m range fiber grating seepage pressure cell pressure response curve.
In figure, each label represents successively: 1, high-elastic B alloy wire; 2, metallic elastic sheet; 3, optical fiber is led in/out; 4, grating; 5, web member 1; 6, web member 2; 7, metal-packaged shell; 8, inlet opening.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described, but embodiment is not limitation of the invention.
As shown in Figure 1, this fiber grating seepage pressure sensor comprises: high-elastic B alloy wire 1, metallic elastic sheet 2, lead in/out optical fiber 3, grating 4, metal-packaged shell 7, inlet opening 8; Displacement transfer is given high-elastic B alloy wire 1 by metallic elastic sheet 2, thus causes the optical fiber Bragg raster 4 be fixed on high-elastic B alloy wire 1 to produce corresponding Bragg wavelength-shift; In addition, this fiber grating seepage pressure sensor also comprises: web member 1, web member 2, for fixing metal flexure strip 3, high-elastic B alloy wire and optical fiber Bragg raster.
Relation between the seepage pressure Sensor monitoring physical quantity of the present invention's design and grating wavelength meets following expression formula: (in formula,
for monitoring water pressure variable quantity;
for grating wavelength variable quantity;
for the grating wavelength variable quantity that temperature causes;
for sensor sensitivity factor;
for grating temperature sensitivity coefficient, it is a constant 10.8;
for temperature variation.）。
In the present invention, sensor package shell adopts stainless steel, and welded seal and transmission cable also adopts stainless steel, sensor is installed in hydraulic engineering, namely under liquid environment, by optical cable and ground (FBG) demodulator signal transmission, realize the monitoring to fluid pressure, have very important meaning to hydraulic engineering health monitoring.
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Claims (8)
1. fiber grating seepage pressure sensor, it is characterized in that: mainly comprise: optical fiber Bragg raster, high-elastic B alloy wire, web member 1, web member 2, inlet opening, metallic elastic sheet and metal-packaged shell, described metal-packaged shell is connected with metallic elastic sheet, one end of metal-packaged shell is provided with inlet opening, and the other end is provided with fiber outlet; Described high-elastic B alloy wire is connected by connecting 1 fitting with between metallic elastic sheet; Described Fiber Bragg Grating FBG is connected with high-elastic B alloy wire by web member 2.
2. fiber grating seepage pressure sensor according to claim 1, is characterized in that: above-mentioned metallic elastic sheet number is 2.
3. fiber grating seepage pressure sensor according to claim 2, is characterized in that: above-mentioned metallic elastic sheet is the thin slice that stainless steel or invar are made.
4. the fiber grating seepage pressure sensor according to claims 1 to 3 any one, is characterized in that: above-mentioned metallic elastic sheet not direct being connected with fiber grating carries out pressure transmission, and fiber grating is connected with high-elastic B alloy wire.
5. the fiber grating seepage pressure sensor according to claim 1 or 4, is characterized in that: high-elastic B alloy wire adopts stainless steel wire or beryllium-bronze silk.
6. fiber grating seepage pressure sensor according to claim 5, is characterized in that: adopt web member 1 to be connected between high-elastic B alloy wire with metallic elastic sheet.
7. fiber grating seepage pressure sensor according to claim 1, is characterized in that: the fiber grating in above-mentioned metal-packaged shell does not directly contact with monitored liquid.
8. fiber grating seepage pressure sensor according to claim 7, is characterized in that: fiber grating is in tensioning state all the time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410025365.XA CN104792453A (en) | 2014-01-21 | 2014-01-21 | High-sensitivity fiber Bragg grating water seepage pressure sensor |
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| CN201410025365.XA CN104792453A (en) | 2014-01-21 | 2014-01-21 | High-sensitivity fiber Bragg grating water seepage pressure sensor |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002098604A (en) * | 2000-09-25 | 2002-04-05 | Furukawa Electric Co Ltd:The | Optical pressure sensor |
| CN201034758Y (en) * | 2007-04-19 | 2008-03-12 | 山东科技大学 | Optical fiber grating pressure sensor force transform structure |
| CN101206150A (en) * | 2006-12-21 | 2008-06-25 | 中国科学院半导体研究所 | Optical fiber pressure sensor based on membrane deflection |
| CN101625273A (en) * | 2009-08-05 | 2010-01-13 | 山东大学 | Fiber bragg grating osmometer |
| CN103017950A (en) * | 2012-11-26 | 2013-04-03 | 山东大学 | High-sensitivity fiber bragg grating earth pressure gauge |
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2014
- 2014-01-21 CN CN201410025365.XA patent/CN104792453A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002098604A (en) * | 2000-09-25 | 2002-04-05 | Furukawa Electric Co Ltd:The | Optical pressure sensor |
| CN101206150A (en) * | 2006-12-21 | 2008-06-25 | 中国科学院半导体研究所 | Optical fiber pressure sensor based on membrane deflection |
| CN201034758Y (en) * | 2007-04-19 | 2008-03-12 | 山东科技大学 | Optical fiber grating pressure sensor force transform structure |
| CN101625273A (en) * | 2009-08-05 | 2010-01-13 | 山东大学 | Fiber bragg grating osmometer |
| CN103017950A (en) * | 2012-11-26 | 2013-04-03 | 山东大学 | High-sensitivity fiber bragg grating earth pressure gauge |
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