CN201852668U - Mining fiber Bragg grating vacuum sensor - Google Patents
Mining fiber Bragg grating vacuum sensor Download PDFInfo
- Publication number
- CN201852668U CN201852668U CN2010205442570U CN201020544257U CN201852668U CN 201852668 U CN201852668 U CN 201852668U CN 2010205442570 U CN2010205442570 U CN 2010205442570U CN 201020544257 U CN201020544257 U CN 201020544257U CN 201852668 U CN201852668 U CN 201852668U
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- Prior art keywords
- bragg grating
- fiber bragg
- case
- elastic rod
- strain film
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- Length Measuring Devices By Optical Means (AREA)
- Measuring Fluid Pressure (AREA)
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Abstract
The utility model relates to a mining fiber Bragg grating vacuum sensor which comprises a case. An opening is formed on one side of the case; a strain film is arranged in the opening in a sealing way; an elastic rod perpendicular to the strain film is arranged in the case; one end of the elastic rod contacts with the strain film, and the other end of the elastic rod penetrates through the side surface of the case and is exposed to the outside; a fiber Bragg grating is arranged on the elastic rod in the case and is connected with a demodulating device outside the case through optical fiber; and a negative pressure zone is formed between the opening of the case and the strain film, and the other zone in the case is communicated with the outside and is a normal pressure zone. The mining fiber Bragg grating vacuum sensor has the advantage of being simpler in structure. The sensor can be used for remote measurement, and optical signals can be transmitted at long range in the optical fiber with extreme low loss. The sensor resists electromagnet interference, and electric signals are not interfered by the severe electromagnetic environment at a measurement field. A sensor network is easy to form, a plurality of probes can be adopted to form the sensor network, and an identical set of demodulating system can be used in a unified way.
Description
Technical field
The utility model 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 purpose of this utility model 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 being provided.
For achieving the above object, the utility model 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, advantage of the present utility model is:
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 the utility model structural representation;
Wherein 1. metal strain films, 2. elastic rod, 3. Fiber Bragg Grating FBG, 4. screw thread, 5. optical fiber, 6. housing.
Embodiment
Below in conjunction with drawings and Examples the utility model is further specified.
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 |
|---|---|---|---|
| CN2010205442570U CN201852668U (en) | 2010-09-27 | 2010-09-27 | Mining fiber Bragg grating vacuum sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205442570U CN201852668U (en) | 2010-09-27 | 2010-09-27 | Mining fiber Bragg grating vacuum sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201852668U true CN201852668U (en) | 2011-06-01 |
Family
ID=44095057
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205442570U Expired - Fee Related CN201852668U (en) | 2010-09-27 | 2010-09-27 | Mining fiber Bragg grating vacuum sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201852668U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108918025A (en) * | 2018-05-09 | 2018-11-30 | 中国矿业大学 | A kind of static demarcating method of mining optical fiber Bragg grating force-measuring anchor stock |
| CN110793710A (en) * | 2019-11-15 | 2020-02-14 | 山东大学 | Double-resolution optical fiber air pressure measuring sensor and method |
-
2010
- 2010-09-27 CN CN2010205442570U patent/CN201852668U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108918025A (en) * | 2018-05-09 | 2018-11-30 | 中国矿业大学 | A kind of static demarcating method of mining optical fiber Bragg grating force-measuring anchor stock |
| CN110793710A (en) * | 2019-11-15 | 2020-02-14 | 山东大学 | Double-resolution optical fiber air pressure measuring sensor and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110601 Termination date: 20110927 |