CN102175364B - Vertical stress fiber grating pressure sensor for analog simulation experiment - Google Patents
Vertical stress fiber grating pressure sensor for analog simulation experiment Download PDFInfo
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- CN102175364B CN102175364B CN 201110047035 CN201110047035A CN102175364B CN 102175364 B CN102175364 B CN 102175364B CN 201110047035 CN201110047035 CN 201110047035 CN 201110047035 A CN201110047035 A CN 201110047035A CN 102175364 B CN102175364 B CN 102175364B
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Abstract
The invention discloses a vertical stress fiber grating pressure sensor for analog simulation experiment, which comprises a cylindrical metal box, a cylindrical rubber block and a fiber grating, wherein the fiber grating is adhered to the side wall of the cylindrical rubber block along the loop direction and used for testing the loop strain of rubber; the lower end face of the cylindrical rubber block is fixed at the bottom of the cylindrical metal box and the upper end face of the of the cylindrical rubber block is connected with the upper end face of the metal box; the cylindrical metal box comprises an upper part and a lower part; the upper part is sheathed with the upper part; the upper part and the lower part can move up and down relatively; and when the vertical stress acts on the upper end face of the metal box, the vertical stress fully acts on the rubber block. The invention provides a new test method for analog simulation experiment and the fiber grating has ultrahigh precision and can supply precise information.
Description
Technical field
The present invention relates to a kind of analog simulation experiment perpendicular stress fiber bragg grating pressure sensor.
Background technology
The equivalent material simulating experiment is one of rock mechanics tradition research method, also is still the effective ways that adopted by many Graduate School of Engineerings at present.Twentieth century full Soviet Union forties mine research institute Г .H. Boris Kuznetsov is founded plane similar material model experiment technology, and is applied in the disrumpent feelings mechanics research in rock stratum of coal mining.The sixties, the method was introduced China university and scientific research team, become the main research means of mining, geotechnical engineering problems, be applied aspect many at rock bursts in coal mines, underground mining, thick seam top coal caving, roadway (tunnel) engineering and Mine Safety Technology etc.
But equivalent material simulating experiment development so far, and the ess-strain in the model can't be tested the problem ubiquity that experimental facilities and experimental technique relatively lag behind.At present used is by the formed various sensors of electric formula strain gauge adhesion.But because foil gauge is subject to external interference, therefore, the situation of sensor failure often occurs, have a strong impact on the experiment test precision.
(1) precision is low;
(2) be subject to external interference and lost efficacy the particularly impact of water;
Fiber grating has been the emerging passive sensitive element of reflection filter a kind of extensive application prospect, function admirable in the world since the nineties in 20th century, responds to extraneous small strain by the movement of Bragg optical grating reflection wavelength and changes and realize the structure on-line measurement.Its ultimate principle is: when the light wave in the optical fiber passes through grating, the light that satisfies the grating wavelength condition is reflected back and becomes reflected light, remaining light becomes transmitted light, the variation of extraneous parameter will cause the drift of reflected light wavelength, and by can obtain the variable quantity of extraneous parameter to the detection of wavelength shift.Temperature and strain are the extraneous parameters that can directly change reflection wavelength.Optical fiber grating structure as shown in Figure 1, wherein 01 is fibre core, 02 for being wrapped in the covering of fibre core outside, Λ is the grating cycle; Fig. 2 is the Energy distributing map of light when passing through grating, and wherein 2-1 is incident light spectrum, and 2-2 is reflectance spectrum, and 2-3 is transmission (conduction) spectrum, and horizontal ordinate represents wavelength, and ordinate represents energy, λ
bBe catoptrical centre wavelength.
Fiber grating has high measuring accuracy, and be not subjected to the external interference such as electromagnetic radiation, also have in addition the multiple advantages such as the laying of being easy to, quasi-distributed measurement, Given this, this technology has in a plurality of fields such as Aero-Space, compound substance, concrete structure engineering, power engineering and medical science and is used widely.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of analog simulation experiment perpendicular stress fiber bragg grating pressure sensor for the deficiencies in the prior art.
The present invention adopts following technical scheme:
The perpendicular stress fiber bragg grating pressure sensor is used in a kind of analog simulation experiment, comprises cylindrical metal box, cylindrical rubber piece and fiber grating; Fiber grating is pasted along hoop in the side of cylindrical rubber piece, is used for the hoop strain of testing rubber, and cylindrical rubber piece lower surface is fixed on the bottom of described cylindrical metal box, and the upper surface links to each other with the can upper surface; Described cylindrical metal box comprises the upper and lower, and the upper and lower connects together, up and down relative motion between the upper and lower, and when perpendicular stress acted on the can upper surface, perpendicular stress all acted on the block rubber.
The experiment of rock pressure [in mine analog simulation is one of rock mechanics research means the most commonly used, but the backwardness of means of testing is the key factor that affects its development for a long time, and particularly the test of scale model internal stress always is an insoluble difficult problem.Therefore, the present invention will provide new means of testing for analog simulation experiment, and fiber grating has high precision, and precise information can be provided.
Description of drawings
Fig. 1 optical fiber grating structure synoptic diagram;
Fig. 2 is the Energy distributing map of light when passing through grating;
Fig. 3 sensor construction synoptic diagram of the present invention
Fig. 4 test process circuit theory of the present invention synoptic diagram.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.
1, sensor construction
Sensor concrete structure of the present invention as shown in Figure 2.Comprise combined cylindrical metal box 10, cylindrical rubber piece 20 and fiber grating 30.Sensing fiber grating 30 is pasted along hoop in the side of cylindrical rubber piece 20, be used for the hoop strain of testing rubber, cylindrical rubber piece 20 lower surfaces are fixed on (for example can be bonding by seccotine), and in the bottom of can 10, the upper surface links to each other with the can upper surface.Combined cylindrical metal box 10 comprises the upper and lower; the upper and lower connects together; up and down relative motion between the upper and lower; can play protection fiber grating 30; when perpendicular stress acts on can 10 upper surface; the can side does not play a supportive role, and perpendicular stress is all acted on the block rubber 20.Simultaneously, can has also been avoided the impact of lateral stress on test process.
2, working sensor principle
Sensor of the present invention is buried to scale model, and perpendicular stress acts on can 10 upper surfaces, produces compression deformation behind block rubber 20 pressurizeds, hoop strain causes fiber grating to produce stretching strain, the reflecting light long hair is given birth to drift, by test, the conversion to reflection wavelength, tries to achieve perpendicular stress.
3, test process
Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and all these improvement and conversion all should belong to the protection domain of claims of the present invention.
Claims (1)
1. the perpendicular stress fiber bragg grating pressure sensor is used in an analog simulation experiment, it is characterized in that, comprises cylindrical metal box, cylindrical rubber piece and fiber grating; Fiber grating is pasted along hoop in the side of cylindrical rubber piece, is used for the hoop strain of testing rubber, and cylindrical rubber piece lower surface is fixed on the bottom of described cylindrical metal box, and the upper surface links to each other with the can upper surface; Described cylindrical metal box comprises the upper and lower, and the upper and lower connects together, up and down relative motion between the upper and lower, and when perpendicular stress acted on the can upper surface, perpendicular stress all acted on the block rubber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110047035 CN102175364B (en) | 2011-02-28 | 2011-02-28 | Vertical stress fiber grating pressure sensor for analog simulation experiment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110047035 CN102175364B (en) | 2011-02-28 | 2011-02-28 | Vertical stress fiber grating pressure sensor for analog simulation experiment |
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| CN102175364A CN102175364A (en) | 2011-09-07 |
| CN102175364B true CN102175364B (en) | 2013-02-06 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103940359B (en) * | 2014-04-21 | 2017-02-01 | 武汉理工大学 | Fiber grating differential strain gauge and manufacturing and using method thereof |
| CN104569351B (en) * | 2015-01-23 | 2016-03-02 | 西安科技大学 | A kind of Fibre Optical Sensor laying apparatus for analog simulation and laying method |
| CN105841721B (en) * | 2016-03-21 | 2018-08-03 | 中广核核电运营有限公司 | A kind of fiber grating force sensor, robot and its sensing measuring method |
| CN106225815B (en) * | 2016-06-30 | 2018-08-31 | 深圳市顺利普科技有限公司 | Fiber Bragg grating sensor and optical fiber Bragg grating sensing device |
| CN111707208A (en) * | 2020-06-24 | 2020-09-25 | 东南大学 | Cylindrical shell structure cross section deformation monitoring method based on distributed macro strain sensing |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101221079A (en) * | 2007-01-11 | 2008-07-16 | 中国人民解放军海军工程大学 | High-sensitivity optical fiber optical grating pressure transducer |
| CN201945414U (en) * | 2011-02-28 | 2011-08-24 | 河南理工大学 | Vertical stress fiber grating pressure sensor for analog simulation tests |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004077289A (en) * | 2002-08-19 | 2004-03-11 | Sumitomo Rubber Ind Ltd | Split type annular flexure |
| TWI346772B (en) * | 2007-06-22 | 2011-08-11 | Univ Nat Chiao Tung | Fiber grating sensor |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101221079A (en) * | 2007-01-11 | 2008-07-16 | 中国人民解放军海军工程大学 | High-sensitivity optical fiber optical grating pressure transducer |
| CN201945414U (en) * | 2011-02-28 | 2011-08-24 | 河南理工大学 | Vertical stress fiber grating pressure sensor for analog simulation tests |
Non-Patent Citations (1)
| Title |
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| JP特开2004-77289A 2004.03.11 |
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