CN201803825U - Mining optical fiber Bragg grating positive pressure sensor - Google Patents
Mining optical fiber Bragg grating positive pressure sensor Download PDFInfo
- Publication number
- CN201803825U CN201803825U CN2010205442532U CN201020544253U CN201803825U CN 201803825 U CN201803825 U CN 201803825U CN 2010205442532 U CN2010205442532 U CN 2010205442532U CN 201020544253 U CN201020544253 U CN 201020544253U CN 201803825 U CN201803825 U CN 201803825U
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- bragg grating
- fiber bragg
- optical fiber
- elastic rod
- housing
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- Length Measuring Devices By Optical Means (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The utility model relates to a mining optical fiber Bragg grating positive pressure sensor, which comprises a shell. One side of the shell is provided with an opening; a strain thin film is hermetically arranged in the opening; an elastic rod device of which the whole is vertical to the strain thin film and is arranged in zigzag is arranged in the shell; one end of the elastic rod device is in contact with the strain thin film, and the other end of the elastic rod device is exposed after passing through the side surface of the shell; an elastic rod in the shell is provided with an optical fiber Bragg grating; the optical fiber Bragg grating is connected with demodulating equipment outside the shell through an optical fiber; an area between the opening of the shell and the strain thin film is a positive pressure area; and other areas in the shell are communicated with the outside and are constant pressure areas. The utility model has the advantages that the sensor has simpler structure and can remotely measure, and an optical signal can be remotely transmitted in the optical fiber at extremely low loss. An anti-electromagnetic interference electric signal is not interfered by the severe electromagnetic environment of the measuring field. A sensing network is easy to form; a plurality of probes can be formed into the sensing network and the sensing networking uniformly uses the same set of demodulating system.
Description
Technical field
The utility model relates to a kind of sensor, the positive pressure sensor of especially a kind of mine optical fiber Bragg grating.
Background technology
Existing mine hydraulic bracket 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 positive pressure sensor of mine optical fiber Bragg grating simple in structure, easy to use being provided.
For achieving the above object, the utility model adopts following technical proposals:
The positive pressure sensor of a kind of mine optical fiber Bragg grating, comprise housing, housing one side opening, sealing is provided with a strain film in the opening, be provided with integral body and the perpendicular elastic rod device that is the zigzag layout of strain film in the housing, described elastic rod device one end contacts with strain film, and 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 zone of positive pressure 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 elastic rod device comprises two elastic rods that be arranged in parallel, wherein an elastic rod one end contacts with strain film, another elastic rod one end is fastenedly connected by screw thread and housing side, remaining corresponding two ends of two elastic rods are hinged by lever, the elastic rod that is connected with housing is provided with Fiber Bragg Grating FBG, and described lever middle part is articulated on the inner walls.
Described strain film is the metal strain film.
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. lever, 3. elastic rod, 4. Fiber Bragg Grating FBG, 5. screw thread, 6. optical fiber, 7. 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 7 that comprises the sensing element that protection is inner; housing 7 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 7 whole and a metal strain film 1 perpendicular be the elastic rod device of arranging in a zigzag; described elastic rod device comprises two elastic rods that be arranged in parallel 3; wherein an elastic rod 3 one ends contact with metal strain film 1; another elastic rod 3 one ends are fastenedly connected 1 by screw thread 5 and housing side; and the end of this elastic rod 3 is exposed at outside; two elastic rods, 3 remaining corresponding two ends are hinged by lever 2, and described lever 2 middle parts are articulated on the inner walls.
Under the original state, with elastic rod 3 pretensions, metal strain film 1 is pushed to the left side like this by pretension screw thread 5.When operate as normal, the left side of metal strain film 1 should be in barotropic 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 left to right like this.Under the effect of this pressure, metal strain film 1 is out of shape to the right through lever transmission after stretching elastic metallic bar generation deformation.Sticking on Fiber Bragg Grating FBG (FBG) 4 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) 4 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. positive pressure sensor of mine optical fiber Bragg grating, comprise housing, it is characterized in that: housing one side opening, sealing is provided with a strain film in the opening, be provided with integral body and the perpendicular elastic rod device that is the zigzag layout of strain film in the housing, described elastic rod device one end contacts with strain film, and 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 zone of positive pressure 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, it is characterized in that: described elastic rod device comprises two elastic rods that be arranged in parallel, wherein an elastic rod one end contacts with strain film, another elastic rod one end is by being fastenedly connected by screw thread and housing side, remaining corresponding two ends of two elastic rods are hinged by lever, the elastic rod that is connected with housing is provided with Fiber Bragg Grating FBG, and described lever middle part is articulated on the inner walls.
3. mine optical fiber Bragg grating negative pressure transducer according to claim 1 is characterized in that: described strain film is the metal strain film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205442532U CN201803825U (en) | 2010-09-27 | 2010-09-27 | Mining optical fiber Bragg grating positive pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205442532U CN201803825U (en) | 2010-09-27 | 2010-09-27 | Mining optical fiber Bragg grating positive pressure sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201803825U true CN201803825U (en) | 2011-04-20 |
Family
ID=43873325
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205442532U Expired - Lifetime CN201803825U (en) | 2010-09-27 | 2010-09-27 | Mining optical fiber Bragg grating positive pressure sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201803825U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101975638A (en) * | 2010-09-27 | 2011-02-16 | 山东大学 | Mining fiber Bragg grating positive pressure sensor |
| CN104880243A (en) * | 2014-02-27 | 2015-09-02 | 同方威视技术股份有限公司 | Fiber grating vibration sensor |
-
2010
- 2010-09-27 CN CN2010205442532U patent/CN201803825U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101975638A (en) * | 2010-09-27 | 2011-02-16 | 山东大学 | Mining fiber Bragg grating positive pressure sensor |
| CN104880243A (en) * | 2014-02-27 | 2015-09-02 | 同方威视技术股份有限公司 | Fiber grating vibration sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110420 Effective date of abandoning: 20120104 |