CN101936792A - Fibre bragg grating negative pressure sensor for mine - Google Patents
Fibre bragg grating negative pressure sensor for mine Download PDFInfo
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- CN101936792A CN101936792A CN 201010293571 CN201010293571A CN101936792A CN 101936792 A CN101936792 A CN 101936792A CN 201010293571 CN201010293571 CN 201010293571 CN 201010293571 A CN201010293571 A CN 201010293571A CN 101936792 A CN101936792 A CN 101936792A
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- bragg grating
- shell
- strain film
- housing
- elastic rod
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Abstract
The invention relates to a fibre bragg grating negative pressure sensor for a mine, which comprises a shell, wherein one side of the shell is provided with an opening which is internally and hermetically provided with a strain film, the shell is internally provided with an elastic rod vertical to the strain film, one end of the elastic rod is in contact with the strain film and the other end thereof passes through the side surface of the shell to be exposed outside, and the elastic rod in the shell is provided with a fibre bragg grating which is connected with a demodulating device outside the shell through an optical fiber; a negative pressure region is arranged between the opening of the shell and the strain film; and the rest region in the shell is communicated with the outside and is a normal pressure region. The invention has the advantage that: the structure is simpler, so that remote measurement can be carried out, and an optical signal can be remotely transmitted with lowest loss in the optical fiber; the anti-electromagnetic interference is obtained, an electric signal is not interfered by a serious electromagnetic environment in a measurement site; and a sensing network is easy to form, a plurality of probes form the sensing network and uniformly use a set of demodulating system.
Description
Technical field
The present invention relates to a kind of sensor, especially a kind of mine optical fiber Bragg grating negative pressure transducer.
Background technology
Existing mining pressure transducer adopts metallic elastic film and resistance strain gage structure combining more.Metallic elastic film generation deformation under pressure, thus this deformation finally is converted to the measurement of the output voltage realization pressure of electric bridge by resistance strain gage and measuring bridge.Its shortcoming has:
1. be subject to electromagnetic interference (EMI)
2. measuring-signal is difficult for long-distance transmissions
3. be difficult for forming sensor network
Summary of the invention
The objective of the invention is for overcoming above-mentioned the deficiencies in the prior art, a kind of mine optical fiber Bragg grating negative pressure transducer simple in structure, easy to use is provided.
For achieving the above object, the present invention adopts following technical proposals:
A kind of mine optical fiber Bragg grating negative pressure transducer, comprise housing, housing one side opening, sealing is provided with a strain film in the opening, be provided with in the housing one with the perpendicular elastic rod of strain film, described elastic rod one end contacts with strain film, the other end passes case side and shows externally, elastic rod in the housing is provided with Fiber Bragg Grating FBG, and Fiber Bragg Grating FBG links to each other by the outer demodulating equipment of optical fiber and housing; The zone is a negative pressuren zone between described shell nozzle place and the strain film, and all the other zones are in communication with the outside in the housing, are atmospheric area.
Described strain film is the metal strain film.
Described elastic rod is fastenedly connected by screw thread and housing side.
Compared with prior art, the invention has the advantages that:
Thereby structure more the simple fiber Bragg grating substituted resistance strain gage and saved electric bridge.
2. can the remote measurement light signal can be with extremely low loss long-distance transmissions in optical fiber, so demodulating end can be far apart from probe; Light signal coming transmission back only to need simple optical fiber and form a loop unlike two lines of electric signal needs.
3. anti-electromagnetic interference (EMI) electric signal is not subjected to the interference of the abominable electromagnetic environment of measure field.
4. be easy to form the sensing network Fiber Bragg Grating FBG and be easy to realize wavelength-division multiplex, therefore a plurality of probes can be formed sensing network, the same set of demodulating system of unified use.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Wherein 1. metal strain films, 2. elastic rod, 3. Fiber Bragg Grating FBG, 4. screw thread, 5. optical fiber, 6. housing.
Embodiment
The present invention is further described below in conjunction with drawings and Examples.
As shown in Figure 1; a kind of mine optical fiber Bragg grating negative pressure transducer; the housing 6 that comprises the sensing element that protection is inner; housing 6 one side openings; sealing is provided with a metal strain film 1 that deformation takes place under pressure in the opening; be provided with in the housing 6 one with the perpendicular elastic rod 2 of metal strain film 1, elastic rod 2 can change the deformation of metal strain film into the tensile deformation of grating, strengthens the strain sensitivity of grating.Described elastic rod 2 one ends contact with metal strain film 1, the other end passes case side and shows externally, elastic rod 2 in the housing 6 is provided with Fiber Bragg Grating FBG 3, Fiber Bragg Grating FBG (Fiber Bragg Grating, FBG) the 3rd, the sensitive element of sensor is converted into optical quantities with the tensile strain of elastic rod 2.Fiber Bragg Grating FBG 3 links to each other with housing 6 demodulating equipment outward by optical fiber 5, and optical fiber 5 can transfer to demodulating end with measuring-signal; The zone is a negative pressuren zone between described shell nozzle place and the metal strain film 1, and all the other zones are in communication with the outside in the housing 6, are atmospheric area.Elastic rod 2 is fastenedly connected by screw thread 4 and housing side.Screw thread 4 can carry out pretension to elastic rod 2, eliminates the idle running in the transmission.Elastic rod 2 is the elastic metallic bar.
Under the original state, with elastic rod 2 pretensions, metal strain film 1 is pulled to the right side like this by pretension screw thread 4.When operate as normal, the left side of metal strain film 1 should be in negative pressure state; The right side is in communication with the outside, and pressure is an atmospheric pressure.Metal strain film 1 will be subjected to direction net pressure from right to left like this.Under the effect of this pressure, thereby metal strain film 1 is out of shape tensile elasticity Metallic rod generation deformation to the left.Sticking on Fiber Bragg Grating FBG (FBG) 3 on the elastic metallic bar experiences the deformation of elastic metallic bar bar and is translated into optical quantities and be transferred to demodulating end.
Illustrated that below pressure signal is converted into the overall process of Fiber Bragg Grating FBG (FBG) 3 strains, will illustrate Fiber Bragg Grating FBG (FBG) 3 below and survey the principle of strain.
The central wavelength lambda of Fiber Bragg Grating FBG (FBG) 3
BCan be expressed as:
λ
B＝2nΛ (1)
Wherein, n is the effective refractive index of grating, and Λ is the cycle of grating.When grating generation axial strain, n and Λ change simultaneously, and the centre wavelength of grating will be with strained drift of grating like this.
Δλ＝λ
B(1-p
e)ε (2)
For common quartzy grating, p
e=0.22, so:
Δλ＝0.78λ
Bε (3)
For centre wavelength is the grating of 1500nm, and its strain sensitivity is about 1.2pm/ μ ε.Wherein, Δ λ represents the drift value of Fiber Bragg Grating FBG centre wavelength, and ε represents strain, and μ ε is microstrain (1 ε=10
6μ ε), pm is wavelength unit (1pm=10
-12M).
As mentioned above, finally be converted into the drift of Fiber Bragg Grating FBG (FBG) 3 centre wavelengths, just can reduce tested pressure signal from wavelength signals through the appropriate signals demodulation by the variation of measuring pressure.
Claims (3)
1. mine optical fiber Bragg grating negative pressure transducer, comprise housing, it is characterized in that: housing one side opening, sealing is provided with a strain film in the opening, be provided with in the housing one with the perpendicular elastic rod of strain film, described elastic rod one end contacts with strain film, the other end passes case side and shows externally, elastic rod in the housing is provided with Fiber Bragg Grating FBG, and Fiber Bragg Grating FBG links to each other by the outer demodulating equipment of optical fiber and housing; The zone is a negative pressuren zone between described shell nozzle place and the strain film, and all the other zones are in communication with the outside in the housing, are atmospheric area.
2. mine optical fiber Bragg grating negative pressure transducer according to claim 1 is characterized in that: described strain film is the metal strain film.
3. mine optical fiber Bragg grating negative pressure transducer according to claim 1 is characterized in that: described elastic rod is fastenedly connected by screw thread and housing side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010293571 CN101936792A (en) | 2010-09-27 | 2010-09-27 | Fibre bragg grating negative pressure sensor for mine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010293571 CN101936792A (en) | 2010-09-27 | 2010-09-27 | Fibre bragg grating negative pressure sensor for mine |
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| CN101936792A true CN101936792A (en) | 2011-01-05 |
Family
ID=43390240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010293571 Pending CN101936792A (en) | 2010-09-27 | 2010-09-27 | Fibre bragg grating negative pressure sensor for mine |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103698080A (en) * | 2014-01-09 | 2014-04-02 | 中国人民解放军总参谋部工程兵科研三所 | Optical fiber F-P cavity high-voltage sensor |
| CN103712730A (en) * | 2014-01-09 | 2014-04-09 | 中国人民解放军总参谋部工程兵科研三所 | Fiber brag grating dynamic high-pressure transducer |
| CN105352652A (en) * | 2015-09-30 | 2016-02-24 | 南京航空航天大学 | Difference fiber bragg grating baroceptor and method of monitoring airspeed tube dynamic pressure of airplane employing the same |
| CN106989863A (en) * | 2017-05-12 | 2017-07-28 | 浙江工业大学 | Point type force cell based on fiber grating |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201016745Y (en) * | 2006-12-21 | 2008-02-06 | 北京品傲光电科技有限公司 | Optical fibre grating osmometer |
| CN101603873A (en) * | 2009-07-14 | 2009-12-16 | 山东大学 | Pull-rod fiber bragg grating osmometer |
| CN201373786Y (en) * | 2008-12-04 | 2009-12-30 | 哈尔滨工业大学 | Liquid-pressure sensor based on fiber gratings |
| CN101625273A (en) * | 2009-08-05 | 2010-01-13 | 山东大学 | Fiber bragg grating osmometer |
-
2010
- 2010-09-27 CN CN 201010293571 patent/CN101936792A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201016745Y (en) * | 2006-12-21 | 2008-02-06 | 北京品傲光电科技有限公司 | Optical fibre grating osmometer |
| CN201373786Y (en) * | 2008-12-04 | 2009-12-30 | 哈尔滨工业大学 | Liquid-pressure sensor based on fiber gratings |
| CN101603873A (en) * | 2009-07-14 | 2009-12-16 | 山东大学 | Pull-rod fiber bragg grating osmometer |
| CN101625273A (en) * | 2009-08-05 | 2010-01-13 | 山东大学 | Fiber bragg grating osmometer |
Non-Patent Citations (1)
| Title |
|---|
| 《中国优秀硕士学位论文全文数据库（信息科技辑）》 20100215 王艳 光纤Bragg光栅压力传感器的研究 11-13 1-3 , 2 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103698080A (en) * | 2014-01-09 | 2014-04-02 | 中国人民解放军总参谋部工程兵科研三所 | Optical fiber F-P cavity high-voltage sensor |
| CN103712730A (en) * | 2014-01-09 | 2014-04-09 | 中国人民解放军总参谋部工程兵科研三所 | Fiber brag grating dynamic high-pressure transducer |
| CN103712730B (en) * | 2014-01-09 | 2016-06-01 | 中国人民解放军总参谋部工程兵科研三所 | A kind of fiber grating dynamic high-pressure sensor |
| CN105352652A (en) * | 2015-09-30 | 2016-02-24 | 南京航空航天大学 | Difference fiber bragg grating baroceptor and method of monitoring airspeed tube dynamic pressure of airplane employing the same |
| CN105352652B (en) * | 2015-09-30 | 2017-12-15 | 南京航空航天大学 | Differential optical fiber grating baroceptor and the method for monitoring aircraft airspeed pipe dynamic pressure |
| CN106989863A (en) * | 2017-05-12 | 2017-07-28 | 浙江工业大学 | Point type force cell based on fiber grating |
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Application publication date: 20110105 |