CN201945414U - Vertical stress fiber grating pressure sensor for analog simulation tests - Google Patents
Vertical stress fiber grating pressure sensor for analog simulation tests Download PDFInfo
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- CN201945414U CN201945414U CN2011200492775U CN201120049277U CN201945414U CN 201945414 U CN201945414 U CN 201945414U CN 2011200492775 U CN2011200492775 U CN 2011200492775U CN 201120049277 U CN201120049277 U CN 201120049277U CN 201945414 U CN201945414 U CN 201945414U
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- fiber grating
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- rubber piece
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Abstract
The utility model discloses a vertical stress fiber grating pressure sensor for analog simulation tests, which comprises a cylindrical metal box, a cylindrical rubber piece and a fiber grating. The fiber grating is pasted along a hoop direction on the side of the cylindrical rubber piece and used for testing hoop strain of the rubber. The lower end face of the cylindrical rubber piece is fixed on the bottom of the cylindrical metal box and the upper end face of the cylindrical rubber piece is connected to the upper end face of the cylindrical metal box. The cylindrical metal box comprises an upper portion and a lower portion which are connected in sleeve joint mode, the upper portion and the lower portion can move up and down relative to each other, and when vertical stress acts on the upper end face of the cylindrical metal box, all of the vertical stress acts on the cylindrical rubber piece. The vertical stress fiber grating pressure sensor for the analog simulation tests provides a novel testing manner for the analog simulation tests and moreover is capable of providing accurate data because the fiber grating has extremely high accuracy.
Description
Technical field
The utility model 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 Γ .H. Boris Kuznetsov is founded plane similar material model experimental technique, and is applied in the disrumpent feelings mechanics research in rock stratum of coal mining.The sixties, this method was introduced China colleges and universities and scientific research team, become the main research means of mining, geotechnical engineering problems, be applied aspect many in coal mine impact ore deposit pressure, 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 for to paste formed various sensor by electric formula foil gauge.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 influence of water;
Fiber grating has been the emerging in the world passive sensitive element of reflection filter a kind of extensive application prospect, function admirable since the nineties in 20th century, responds to extraneous small strain by moving 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 and returns to form to be 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; Energy distribution figure when Fig. 2 passes through grating for light, wherein 2-1 is an incident light spectrum, and 2-2 is a reflectance spectrum, and 2-3 is transmission (conduction) spectrum, and horizontal ordinate is represented wavelength, and ordinate is represented energy, and λ b is catoptrical centre wavelength.
Fiber grating has high measuring accuracy, and be not subjected to external interference such as electromagnetic radiation, also have multiple advantages such as the laying of being easy to, quasi-distributed measurement in addition, 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.
The utility model content
Technical problem to be solved in the utility model is to provide a kind of analog simulation experiment perpendicular stress fiber bragg grating pressure sensor at the deficiencies in the prior art.
The utility model 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, relative motion up and down 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 influences its development for a long time, and particularly the test of scale model internal stress always is an insoluble difficult problem.Therefore, the utility model 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;
Energy distribution figure when Fig. 2 passes through grating for light;
Fig. 3 the utility model sensor construction synoptic diagram
Fig. 4 the utility model test process circuit theory synoptic diagram.
Embodiment
Below in conjunction with specific embodiment, the utility model is elaborated.
1, sensor construction
The utility model sensor concrete structure 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; relative motion up and down between the upper and lower; can play protection fiber grating 30; when perpendicular stress acts on can 10 upper surfaces; 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 influence of lateral stress to test process.
2, working sensor principle
Sensor of the present utility model is buried to scale model, perpendicular stress acts on can 10 upper surfaces, produce 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, conversion, try to achieve perpendicular stress to reflection wavelength.
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 the utility model claims.
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, relative motion up and down 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 |
|---|---|---|---|
| CN2011200492775U CN201945414U (en) | 2011-02-28 | 2011-02-28 | Vertical stress fiber grating pressure sensor for analog simulation tests |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200492775U CN201945414U (en) | 2011-02-28 | 2011-02-28 | Vertical stress fiber grating pressure sensor for analog simulation tests |
Publications (1)
| Publication Number | Publication Date |
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| CN201945414U true CN201945414U (en) | 2011-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011200492775U Expired - Lifetime CN201945414U (en) | 2011-02-28 | 2011-02-28 | Vertical stress fiber grating pressure sensor for analog simulation tests |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102175364A (en) * | 2011-02-28 | 2011-09-07 | 河南理工大学 | Vertical stress fiber grating pressure sensor for analog simulation experiment |
| CN103983385A (en) * | 2014-05-07 | 2014-08-13 | 王东方 | Ellipsoidal optical fiber pressure sensor and optical fiber fault pressure point detection method |
| 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 |
-
2011
- 2011-02-28 CN CN2011200492775U patent/CN201945414U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102175364A (en) * | 2011-02-28 | 2011-09-07 | 河南理工大学 | Vertical stress fiber grating pressure sensor for analog simulation experiment |
| CN102175364B (en) * | 2011-02-28 | 2013-02-06 | 河南理工大学 | Vertical stress fiber grating pressure sensor for analog simulation experiment |
| CN103983385A (en) * | 2014-05-07 | 2014-08-13 | 王东方 | Ellipsoidal optical fiber pressure sensor and optical fiber fault pressure point detection method |
| CN103983385B (en) * | 2014-05-07 | 2016-05-18 | 王东方 | A kind of method of elliposoidal fibre optic compression sensor and detection fiber fault pressure spot |
| 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 |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110824 Effective date of abandoning: 20130306 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20110824 Effective date of abandoning: 20130306 |
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| RGAV | Abandon patent right to avoid regrant |