CN206710014U - FBG pressure sensors based on all-metalization encapsulation - Google Patents
FBG pressure sensors based on all-metalization encapsulation Download PDFInfo
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- CN206710014U CN206710014U CN201720150038.6U CN201720150038U CN206710014U CN 206710014 U CN206710014 U CN 206710014U CN 201720150038 U CN201720150038 U CN 201720150038U CN 206710014 U CN206710014 U CN 206710014U
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- optical fiber
- fbg
- temperature compensation
- compensation component
- strain measurement
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Abstract
The utility model discloses the FBG pressure sensors encapsulated based on all-metalization, including strain measurement part, temperature compensation component and optical fiber components, the temperature compensation component is arranged on strain measurement component upper ends, the optical fiber components are provided with optical fiber fairlead, optical fiber fairlead is inserted at the top of temperature compensation component, the lower end of the optical fiber fairlead passes through on optical fiber and the contiguous block of strain measurement feature bottom, the optical fiber passes through temperature compensation component and strain measurement part, the optical fiber, which is located in temperature compensation component, is provided with temperature survey grating, the FBG grating strings of metallization are provided with the strain measurement part, the FBG gratings string is arranged on optical fiber.The utility model provides a kind of FBG pressure sensors of metallization, and it has a high temperature high voltage resistant characteristic, big range, high accuracy, has an independent temperature compensation function, and can in oil gas well longtime running.
Description
Technical field
It the utility model is related to field of sensing technologies, more particularly to a kind of FBG pressure sensings based on all-metalization encapsulation
Device.
Background technology
Pressure sensor is that one kind has a wide range of application, the big sensor of demand.Disliked for HTHP, inflammable and explosive etc.
Bad environment, traditional pressure sensor can not meet to require.The sensor made using fiber grating is a kind of emerging sensing
Device, quick development is obtained because of the advantages of its is unique, wherein especially with Fiber Bragg Grating FBG（Fiber Bragg
Grating abbreviations FBG）Based on.FBG is a kind of refractive index of optical fiber fiber core along on the axial direction of optical fiber by periodically
Modulate and manufactured passive device.It optionally can reflect back the light of a certain narrowband wavelength in incident broad band light.Quilt
The centre wavelength of reflected light is referred to as bragg wavelength.Bragg wavelength is determined by the effective refractive index and screen periods of grating.And
They are again sensitive to the strain variation suffered by it and temperature change.The bragg wavelength reflected by detecting FBG fiber gratings
Variable quantity can be obtained by strain and temperature information suffered by fiber grating.FBG fibre optical sensors have the advantages of its is peculiar
Anticorrosive including electromagnetism interference, transmission range length, small volume is in light weight, and measurement signal is not influenceed by light loss, and
It can be multiplexed.But because naked FBG small volumes, diameter only have 125 microns, easily damaged in severe engineering-environment, and
Hydrogen phenomenon can occur in hot and humid environment, make FBG gratings that irreversible permanent damage occur, it is special to lose its sensing
Property.Such as patent No. CN200910229032 proposes one kind《Fiber bragg grating pressure sensor with temperature-compensating》, but its
In use high-temperature Resistance Adhesives so that it can not be used in the oil gas well of HTHP for a long time, so here,
We research and develop a kind of pressure sensor of all-metal, avoid the unstability of measurement brought by organic binder bond aging.
Utility model content
In order to overcome the above-mentioned deficiencies of the prior art, the utility model provides a kind of FBG pressure sensors of metallization,
It has high temperature high voltage resistant characteristic, big range, high accuracy, has independent temperature compensation function, and can be in oil gas
Longtime running in well.
Technical scheme is used by the utility model solves its technical problem：
Based on the FBG pressure sensors of all-metalization encapsulation, including strain measurement part, temperature compensation component and optical fiber portion
Part, the temperature compensation component are arranged on strain measurement component upper ends, and the optical fiber components are provided with optical fiber fairlead, and optical fiber is drawn
Pipe is inserted at the top of temperature compensation component, and the lower end of the optical fiber fairlead passes through optical fiber and the connection of strain measurement feature bottom
On block, the optical fiber passes through temperature compensation component and strain measurement part, and the optical fiber, which is located in temperature compensation component, is provided with temperature
Degree measurement grating, the interior FBG grating strings for being provided with metallization of the strain measurement part, the FBG gratings string are arranged on optical fiber.
As the improvement of above-mentioned technical proposal, the temperature compensation component and strain measurement part are equipped with using cast steel
Manufactured housing.
As the improvement of above-mentioned technical proposal, the optical fiber fairlead, which is located at the top of temperature compensation component, is set with fluorine silica gel
Pad.
As the improvement of above-mentioned technical proposal, the optical fiber fairlead, which is located in fluorine silicagel pad, is set with upper end cover, described
End cap bottom spins with temperature compensation component.
As the improvement of above-mentioned technical proposal, the optical fiber fairlead, which is located in fluorine silicagel pad, is set with upper end cover, described
End cap bottom spins with temperature compensation component.
As the improvement of above-mentioned technical proposal, the optical fiber is located at temperature compensation component top and is provided with the first gold-plated pipe end
Head, the optical fiber are located at strain measurement part top and are provided with the second gold-plated pipe end, the second gold-plated pipe end upper end installation
In the bottom of temperature compensation component.
As the improvement of above-mentioned technical proposal, the strain measurement feature bottom is provided with bottom, and is threadedly coupled with housing,
The contiguous block is arranged on bottom.
As the improvement of above-mentioned technical proposal, the FBG gratings string is provided with two groups, and is connected on optical fiber, the FBG light
Grid string is welded on optical fiber by high temperature scolding tin.
The beneficial effects of the utility model have：
The utility model provides a kind of high temperature high voltage resistant characteristic, big range, high accuracy and has independent temperature-compensating
The FBG pressure sensors of the metallization of function, it includes the Fiber Bragg Grating FBG of two metallization, is connected using gold-plated pipe end
Connect, using casting die steel as sensor housing, one end high temperature of one of metallized optical fibre Bragg grating
On second gold-plated pipe end of the sensing upper surface of scolding tin welding pressure sensor, the other end is fixed on the contiguous block of sensor
On, as pressure sensing grating, another grating is welded on the inner surface of sensor with high temperature scolding tin with free state, this knot
The sensor of structure is applied to HTHP, inflammable and explosive environment, not Keep away from radioactive, and electromagnetism interference, measurement range is big, measurement accuracy
Height, has temperature compensation function, and measurement result is not affected by temperature.
Brief description of the drawings
Below in conjunction with the accompanying drawings and specific embodiment the utility model is described in further detail, wherein：
Fig. 1 is the sectional view of the utility model embodiment.
Embodiment
Referring to Fig. 1, the FBG pressure sensors of the present utility model based on all-metalization encapsulation, including strain measurement part
1st, temperature compensation component 2 and optical fiber components 3, the temperature compensation component 2 and strain measurement part 1 are equipped with housing, and adopt
It is made of cast steel, cast steel has the advantages that thermal coefficient of expansion is small, and lower yield strength is big, and tensile strength is big, can be effective
Its structural stability under high temperature and high pressure environment is lifted, especially suitable in the working environment of Oil/gas Well.The temperature-compensating
Part 2 is screwed in the upper end of strain measurement part 1 by NPT screw threads, and we utilize this two parts the cone at NPT 60 ° of angles here
Shape pressure-resistant seal is threadedly coupled, in order to meet its use demand in the environment of HTHP.The optical fiber components 3 are provided with light
Fine fairlead 31, optical fiber fairlead 31 are inserted into the top of temperature compensation component 2, and the optical fiber fairlead 31 is located at temperature compensation division
The top of part 2 is set with fluorine silicagel pad 5, and for the gap of hermetic fiber fairlead 31 and temperature compensation component 2, the optical fiber is drawn
Pipe 31, which is located in fluorine silicagel pad 5, is set with end cap 6, and the bottom of end cap 6 spins with temperature compensation component 2, enters one using end cap 6
Step improves the sealing of whole device, while also protects fluorine silicagel pad 5 not corroded by the paint gas in oil gas well.
The lower end of the optical fiber fairlead 31 passes through temperature compensation component 2 by optical fiber 4, and is connected to strain measurement part
On the contiguous block 11 of 1 bottom, the bottom of strain measurement part 1 is provided with bottom 13, and is spun by screw thread and housing, the company
Connect block 11 to be arranged on bottom 13, be that dismounting fills a pressure sensor for convenience using bottom 13.The optical fiber 4 is located at temperature
The top of compensating unit 2 is provided with the first gold-plated pipe end 41, and it is gold-plated provided with second that the optical fiber 4 is located at the top of strain measurement part 1
Pipe end 42, the second gold-plated upper end of pipe end 42 are connected to the bottom of temperature compensation component 2.Connected using gold-plated pipe end
Connect different component so that the technique that different sections of optical fiber 4 welds is simplified, wherein gold-plated pipe end uses gold-plated capillary pipe support
Form.The optical fiber 4, which is located in temperature compensation component 2, is provided with temperature survey grating 21, and temperature survey grating 21 is provided with two groups, adopts
It is fiber bragg grating, then temperature survey grating 21 is welded on the madial wall of temperature compensation component 2, wherein temperature is surveyed
The scope for measuring the centre wavelength of grating 21 selects C-band 1525nm ~ 1565nm.
It is provided with the FBG gratings string 12 of metallization in the strain measurement part 1, the FBG gratings string 12 is provided with two groups, and
It is connected on optical fiber 4, the FBG gratings string 12 is welded on optical fiber 4 by high temperature scolding tin.The centre wavelength of FBG gratings string 12
Scope can also select C-band 1525nm ~ 1565nm, but the centre wavelength of itself and temperature survey grating 21 must have necessarily
Wavelength interval, avoid occur wavelength between aliasing, so that it cannot the parameter sensing required for drawing us.Welded with high temperature
Tin is welding compound, can effectively lift the pressure sensor in the service life of high temperature and high pressure environment and the stabilization of longtime running
Property.When there is the enhanced sensitivity film end face that pressure acts on pressure sensor, the center of its end face is the second gold-plated pipe end
42 positions fixed in end face can free largest deformation, so that extraneous pressure transmission realizes pressure to FBG gratings string 12
Detection function.
It is described above, simply better embodiment of the present utility model, but the utility model is not limited to above-mentioned reality
Example is applied, as long as it reaches technique effect of the present utility model with any same or similar means, should all belong to of the present utility model
Protection domain.
Claims (7)
1. the FBG pressure sensors based on all-metalization encapsulation, it is characterised in that：Including strain measurement part（1）, temperature-compensating
Part（2）And optical fiber components（3）, the temperature compensation component（2）Installed in strain measurement part（1）Upper end, the optical fiber portion
Part（3）Provided with optical fiber fairlead（31）, optical fiber fairlead（31）It is inserted into temperature compensation component（2）Top, the optical fiber are drawn
Pipe（31）Lower end pass through optical fiber（4）With strain measurement part（1）The contiguous block of bottom（11）On, the optical fiber（4）Through temperature
Spend compensating unit（2）With strain measurement part（1）, the optical fiber（4）Positioned at temperature compensation component（2）It is interior to be provided with temperature survey light
Grid（21）, the strain measurement part（1）The interior FBG grating strings for being provided with metallization（12）, the FBG gratings string（12）It is arranged on
Optical fiber（4）On.
2. the FBG pressure sensors according to claim 1 based on all-metalization encapsulation, it is characterised in that：The temperature
Compensating unit（2）With strain measurement part（1）It is equipped with and uses housing made of cast steel.
3. the FBG pressure sensors according to claim 1 based on all-metalization encapsulation, it is characterised in that：The optical fiber
Fairlead（31）Positioned at temperature compensation component（2）Top is set with fluorine silicagel pad（5）.
4. the FBG pressure sensors according to claim 3 based on all-metalization encapsulation, it is characterised in that：The optical fiber
Fairlead（31）Positioned at fluorine silicagel pad（5）On be set with upper end cover（6）, the end cap（6）Bottom and temperature compensation component（2）Rotation
Connect.
5. the FBG pressure sensors according to claim 1 based on all-metalization encapsulation, it is characterised in that：The optical fiber
（4）Positioned at temperature compensation component（2）Top is provided with the first gold-plated pipe end（41）, the optical fiber（4）Positioned at strain measurement part
（1）Top is provided with the second gold-plated pipe end（42）, the second gold-plated pipe end（42）Upper end is arranged on temperature compensation component（2）
Bottom.
6. the FBG pressure sensors according to claim 1 based on all-metalization encapsulation, it is characterised in that：The strain
Measuring part（1）Bottom is provided with bottom（13）, and be threadedly coupled with housing, the contiguous block（11）It is arranged on bottom（13）On.
7. the FBG pressure sensors according to claim 1 based on all-metalization encapsulation, it is characterised in that：The FBG light
Grid string（12）Provided with two groups, and it is connected on optical fiber（4）On, the FBG gratings string（12）Optical fiber is welded on by high temperature scolding tin（4）
On.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720150038.6U CN206710014U (en) | 2017-02-17 | 2017-02-17 | FBG pressure sensors based on all-metalization encapsulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720150038.6U CN206710014U (en) | 2017-02-17 | 2017-02-17 | FBG pressure sensors based on all-metalization encapsulation |
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| CN206710014U true CN206710014U (en) | 2017-12-05 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110542499A (en) * | 2019-10-10 | 2019-12-06 | 深圳市基础工程有限公司 | Fiber grating soil pressure sensor with temperature compensation function |
| CN112461436A (en) * | 2020-12-02 | 2021-03-09 | 南通装配式建筑与智能结构研究院 | Plain type fiber grating osmometer |
-
2017
- 2017-02-17 CN CN201720150038.6U patent/CN206710014U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110542499A (en) * | 2019-10-10 | 2019-12-06 | 深圳市基础工程有限公司 | Fiber grating soil pressure sensor with temperature compensation function |
| CN112461436A (en) * | 2020-12-02 | 2021-03-09 | 南通装配式建筑与智能结构研究院 | Plain type fiber grating osmometer |
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