CN208420261U - A kind of fiber grating fluid pressure sensor - Google Patents
A kind of fiber grating fluid pressure sensor Download PDFInfo
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- CN208420261U CN208420261U CN201821294201.7U CN201821294201U CN208420261U CN 208420261 U CN208420261 U CN 208420261U CN 201821294201 U CN201821294201 U CN 201821294201U CN 208420261 U CN208420261 U CN 208420261U
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- flat diaphragm
- fiber grating
- pressure chamber
- connecting cylinder
- cover
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Abstract
The utility model discloses a kind of fiber grating fluid pressure sensors, the fiber grating fluid pressure sensor includes two sensitive flat diaphragms, a fiber grating, a connecting cylinder, upper cover, lower cover and pressure chamber, wherein fiber grating is located inside connecting cylinder and both ends are fixed after stretched, and connecting cylinder upper and lower side is respectively connected with a flat diaphragm；Two flat diaphragm peripheries are fixed on pressure chamber and upper cover or lower lid, when there is the fluid input pressures room such as gas, liquid, two flat diaphragm reversal deformations, so that connecting cylinder Tensile, internal fiber grating perception stretcher strain and generation wavelength drift.Fiber grating sealing is solid and reliable in the utility model, and double flat diaphragm generates more large deformation, and sensitivity is higher.
Description
Technical field
The utility model belongs to technical field of optical fiber sensing, and in particular to a kind of fiber grating fluid pressure sensor.
Background technique
The pressure of the fluids such as air-liquid is measurement object very common and important in industrial production, such as pressure vessel, coal gas
The pressure status monitoring such as pipeline, oil pipeline, abnormal pressure state are that they are likely to occur the prelude of damage, destruction, therefore
Accident early warning can be realized by monitoring pressure, for this purpose, accurately and reliably pressure monitoring sensor seems extremely important.
Traditional pressure sensor is designed based on technologies such as strain ga(u)ge, MEMS, but these sensing technologies all exist
The defects of volume is big, number of leads is more, weak electric signal stability is poor, therefore, with it is miniature it is easy of integration, anti-electromagnetic interference capability is strong
And wavelength signals are by the appearance of the fiber grating sensing technology of the advantages such as signal light source power influence of fluctuations, and then produce base
In the novel pressure sensor of fiber grating sensing technology.
Fiber grating is generally affixed directly to flat diaphragm or c-type pipe surface by existing fiber bragg grating pressure sensor,
The strain generated under pressure by measurement flat diaphragm or c-type pipe is this to be limited to flat membrane come the size of inverting pressure
The elastic limit of material of piece or c-type pipe, therefore transducer sensitivity is not high, and fiber grating region paste List, easily occurs
Chirp phenomenon leads to sensor failure.
Utility model content
For the above-mentioned problems in the prior art, the utility model provides a kind of fiber grating Fluid pressure sensing
Device preferably solves existing fiber grating pressure sensor and is unfavorable for the technical issues of carrying out highly sensitive pressure measurement, light
Fine grating sealing is solid and reliable, and double flat diaphragm generates more large deformation, and sensitivity is higher.
For this purpose, the utility model uses following technical scheme:
A kind of fiber grating fluid pressure sensor, including upper cover, upper flat diaphragm, pressure chamber, lower flat diaphragm, lower cover, company
Connect cylinder, fiber grating and adhesive；The upper cover and lower cover are cylindrical shape open at one end, and the two diameter is equal, open end
Relatively；The pressure chamber is the cylindrical structure of both ends open, between upper cover and lower cover, the diameter of diameter and upper cover and lower cover
It is equal；The upper flat diaphragm and lower flat diaphragm are thin rounded flakes, and outer diameter is equal with the outer diameter of pressure chamber, and center is equipped with through-hole；
The lower surface of the upper surface and upper cover open end of the upper flat diaphragm is fixed, the lower surface of upper flat diaphragm and the upper surface of pressure chamber
It is fixed；The upper surface of the lower flat diaphragm and the lower surface of pressure chamber are fixed, lower surface and the lower cover open end of lower flat diaphragm
Upper surface is fixed；The connecting cylinder is cylindrical structure, and outer diameter is less than the internal diameter of pressure chamber, the outer surface point of connecting cylinder upper and lower ends
Do not match with the central through hole of upper flat diaphragm and lower flat diaphragm and merges fixation；The fiber grating is located at the cavity inside connecting cylinder
It is interior, the upper and lower ends for being fixed on connecting cylinder are pasted after the optical fiber drawn at both ends by adhesive.
Preferably, it is provided with an optical fiber hole on the side wall of the upper cover and lower cover, is respectively used to draw optical fiber.
Preferably, it is provided with fluid inlet on the side wall of the pressure chamber, entered in pressure chamber for external fluid.
Compared with prior art, the utility model has the beneficial effects that
(1) with by fiber grating region paste List on the elastic constructions such as flat diaphragm or c-type pipe surface compared with, this is practical
Fiber grating in novel is located inside connecting cylinder, and grating part is not pasted, will not chirp, it is more stable.
(2) it is converted into the stretching to connecting cylinder as elastic element, and by the deformation of flat diaphragm using two flat diaphragms, into
And stretching optical fiber grating, double flat diaphragm deformation are bigger, improve sensitivity.
(3) structure is simple, small in size, and fiber grating sealing is solid and reliable.
Detailed description of the invention
Fig. 1 is a kind of structure composition schematic diagram of fiber grating fluid pressure sensor provided by the utility model.
Fig. 2 is the structural representation of upper flat diaphragm in a kind of fiber grating fluid pressure sensor provided by the utility model
Figure.
Description of symbols: 1, upper cover；2, upper flat diaphragm；3, pressure chamber；3-1, fluid inlet；4, lower flat diaphragm；5, under
Lid；6, connecting cylinder；7, fiber grating；8, adhesive.
Specific embodiment
With reference to the accompanying drawing and specific embodiment is described in detail the utility model, specific embodiment therein and says
It is bright to be only used to explain the utility model, but be not intended to limit the scope of the present invention.
As depicted in figs. 1 and 2, the utility model discloses a kind of fiber grating fluid pressure sensor, including upper cover 1,
Upper flat diaphragm 2, pressure chamber 3, lower flat diaphragm 4, lower cover 5, connecting cylinder 6, fiber grating 7 and adhesive 8；The upper cover 1 and lower cover 5
It is cylindrical shape open at one end, the two diameter is equal, and open end is opposite；The pressure chamber 3 is the cylindrical structure of both ends open,
Between upper cover 1 and lower cover 5, diameter is equal with the diameter of upper cover 1 and lower cover 5；The upper flat diaphragm 2 and lower flat diaphragm 4 are equal
For thin rounded flakes, outer diameter is equal with the outer diameter of pressure chamber 3, and center is equipped with through-hole；The upper surface of the upper flat diaphragm 2 and upper cover 1
The lower surface of open end is fixed, and the upper surface of the lower surface and pressure chamber 3 of upper flat diaphragm 2 is fixed；The upper table of the lower flat diaphragm 4
The lower surface in face and pressure chamber 3 is fixed, and the upper surface of the lower surface and 5 open end of lower cover of lower flat diaphragm 4 is fixed；The connecting cylinder
6 be cylindrical structure, and outer diameter is less than the internal diameter of pressure chamber 3, the outer surface of 6 upper and lower ends of connecting cylinder respectively with upper flat diaphragm 2 and under
The central through hole of flat diaphragm 4 is fixed with merging；The fiber grating 7 is located in the cavity inside connecting cylinder 6, the optical fiber warp at both ends
The upper and lower ends for being fixed on connecting cylinder 6 are pasted after stretching by adhesive 8.
Specifically, it is provided with an optical fiber hole on the side wall of the upper cover 1 and lower cover 5, is respectively used to draw optical fiber.
Specifically, it is provided with fluid inlet 3-1 on the side wall of the pressure chamber 3, enters pressure chamber 3 for external fluid
It is interior.
Embodiment
A kind of workflow of fiber grating fluid pressure sensor is as follows:
Firstly, fiber grating 7 is passed through connecting cylinder 6, so that then applying active force inside grid region merging connecting cylinder 6 and drawing
Fiber grating 7 is stretched, and after making wave length shift 1nm, fills in adhesive 8 at 6 both ends of connecting cylinder, after the solidification of adhesive 8, then is removed
Active force is removed, then fiber grating 7 is fixed inside connecting cylinder 6 and is in tensioned state；
Secondly, 6 upper end of connecting cylinder with fiber grating 7 is inserted into the through-hole at upper 2 center of flat diaphragm, and use laser
It is welded and fixed, the tail optical fiber of 7 upper end of fiber grating is then passed through into the optical fiber hole on 1 cylindrical wall of upper cover and is drawn, by the opening of upper cover 1
End and upper 2 concentric alignment of flat diaphragm, and use laser welding by the following table of 1 open end of the upper surface of flat diaphragm 2 and the upper cover
Face is fixed, then, by pressure chamber 3 and upper 2 concentric alignment of flat diaphragm, using laser welding by the lower surface of upper flat diaphragm 2 and institute
The upper surface for stating pressure chamber 3 is fixed；
Again, it adopts in a like fashion, 6 lower end of connecting cylinder is inserted into the through-hole at lower 4 center of flat diaphragm, meanwhile, it is natural
Ground, pressure chamber 3 and lower 4 concentric alignment of flat diaphragm, the lower surface of the upper surface and pressure chamber 3 that make lower flat diaphragm 4 are fixed, using sharp
Connecting cylinder 6 and lower flat diaphragm 4 and pressure chamber 3 and lower flat diaphragm 4 are fixed in photocoagulation；
It is drawn finally, the tail optical fiber of 7 lower end of fiber grating is passed through the optical fiber hole on 5 cylindrical wall of lower cover, by pressure chamber 3 under
4 concentric alignment of flat diaphragm is fixed the upper surface of 5 open end of the lower surface of lower flat diaphragm 4 and the lower cover using laser welding,
Complete sensor encapsulation manufacture.
Extraneous detected fluid is entered in pressure chamber 3 by fluid inlet 3-1, causes flat diaphragm 2 upwardly-deformed, and lower flat
Diaphragm 4 deforms downwards, to stretch connecting cylinder 6, and then stretches the fiber grating 7 that both ends are fixed therein portion, 7 wave of fiber grating
Length is drifted about.By test calibration in laboratory, wavelength shift and the direct functional relation of ambient pressure can be obtained,
When then carrying out in-site measurement, the wave length shift situation of fiber grating 7 is obtained, it, can be anti-in conjunction with functional relation obtained by calibrating
Release the pressure condition at the scene of being tested.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Made any modification, equivalent replacement and improvement etc., should be included in this reality within the spirit and spirit of utility model
Within novel protection scope.
Claims (3)
1. a kind of fiber grating fluid pressure sensor, including upper cover (1), upper flat diaphragm (2), pressure chamber (3), lower flat diaphragm
(4), lower cover (5), connecting cylinder (6), fiber grating (7) and adhesive (8), it is characterised in that: the upper cover (1) and lower cover (5)
It is cylindrical shape open at one end, the two diameter is equal, and open end is opposite；The pressure chamber (3) is the cylinder knot of both ends open
Structure, between upper cover (1) and lower cover (5), diameter is equal with the diameter of upper cover (1) and lower cover (5)；The upper flat diaphragm (2)
It is thin rounded flakes with lower flat diaphragm (4), outer diameter is equal with the outer diameter of pressure chamber (3), and center is equipped with through-hole；The upper flat diaphragm
(2) lower surface of upper surface and upper cover (1) open end is fixed, the lower surface of upper flat diaphragm (2) and the upper surface of pressure chamber (3)
It is fixed；The lower surface of the upper surface and pressure chamber (3) of the lower flat diaphragm (4) is fixed, the lower surface of lower flat diaphragm (4) and lower cover
(5) upper surface of open end is fixed；The connecting cylinder (6) is cylindrical structure, and outer diameter is less than the internal diameter of pressure chamber (3), connecting cylinder
(6) outer surface of upper and lower ends matches with the central through hole of upper flat diaphragm (2) and lower flat diaphragm (4) merge fixation respectively；The light
Fine grating (7) is located in the internal cavity of connecting cylinder (6), is pasted and is fixed on by adhesive (8) after the optical fiber drawn at both ends
The upper and lower ends of connecting cylinder (6).
2. a kind of fiber grating fluid pressure sensor according to claim 1, it is characterised in that: the upper cover (1) and
It is provided with an optical fiber hole on the side wall of lower cover (5), is respectively used to draw optical fiber.
3. a kind of fiber grating fluid pressure sensor according to claim 1, it is characterised in that: the pressure chamber (3)
Side wall on be provided with fluid inlet (3-1), enter in pressure chamber (3) for external fluid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821294201.7U CN208420261U (en) | 2018-08-13 | 2018-08-13 | A kind of fiber grating fluid pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821294201.7U CN208420261U (en) | 2018-08-13 | 2018-08-13 | A kind of fiber grating fluid pressure sensor |
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| Publication Number | Publication Date |
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| CN208420261U true CN208420261U (en) | 2019-01-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201821294201.7U Active CN208420261U (en) | 2018-08-13 | 2018-08-13 | A kind of fiber grating fluid pressure sensor |
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| CN (1) | CN208420261U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112362115A (en) * | 2020-09-09 | 2021-02-12 | 中国航空工业集团公司沈阳飞机设计研究所 | Small flow sensor based on fiber bragg grating and measuring system |
| CN112729400A (en) * | 2020-12-25 | 2021-04-30 | 武汉理工大学 | Dual-purpose sensor for flow velocity and liquid pressure |
-
2018
- 2018-08-13 CN CN201821294201.7U patent/CN208420261U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112362115A (en) * | 2020-09-09 | 2021-02-12 | 中国航空工业集团公司沈阳飞机设计研究所 | Small flow sensor based on fiber bragg grating and measuring system |
| CN112729400A (en) * | 2020-12-25 | 2021-04-30 | 武汉理工大学 | Dual-purpose sensor for flow velocity and liquid pressure |
| CN112729400B (en) * | 2020-12-25 | 2022-07-12 | 武汉理工大学 | Dual-purpose sensor for flow velocity and liquid pressure |
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