CN109163843A - A kind of fiber bragg grating pressure sensor being controllably pre-stretched - Google Patents
A kind of fiber bragg grating pressure sensor being controllably pre-stretched Download PDFInfo
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- CN109163843A CN109163843A CN201811136582.0A CN201811136582A CN109163843A CN 109163843 A CN109163843 A CN 109163843A CN 201811136582 A CN201811136582 A CN 201811136582A CN 109163843 A CN109163843 A CN 109163843A
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- round tube
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- 239000000835 fiber Substances 0.000 title claims abstract description 40
- 230000005540 biological transmission Effects 0.000 claims abstract description 19
- 238000006243 chemical reaction Methods 0.000 claims abstract description 6
- 230000035945 sensitivity Effects 0.000 claims abstract description 5
- 230000004224 protection Effects 0.000 claims description 17
- 239000007788 liquid Substances 0.000 claims description 12
- 239000013307 optical fiber Substances 0.000 claims description 12
- 238000012360 testing method Methods 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 150000002739 metals Chemical class 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- 239000010935 stainless steel Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 8
- 238000006073 displacement reaction Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000010923 batch production Methods 0.000 abstract 1
- 230000007797 corrosion Effects 0.000 abstract 1
- 238000005260 corrosion Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
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- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
- G01L11/02—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00 by optical means
- G01L11/025—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00 by optical means using a pressure-sensitive optical fibre
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
- Optical Transform (AREA)
Abstract
The invention belongs to fiber grating sensing technology fields, are related to a kind of fiber bragg grating pressure sensor being controllably pre-stretched.The pressure sensor is mainly made of shell, pretensioning system, power conversion device and sensing arrangement, using convoluted diaphragm under inside and outside differential pressure effect, center point generates the vertical displacement directly proportional to pressure difference, and transmission rod converts the measurement of center vertical displacement to the measurement of fiber grating strain.Sensing arrangement passes through fixed link, realizes that the pre-stretching of fiber grating controls by turning nut in end, making sensing arrangement, fiber grating is in tension state always under pressure.The thermos have the advantages that the sensor structure is simple, easy to make, corrosion-resistant, electromagnetism interference, long-time stability are good, high sensitivity；Pre-stretching control may be implemented, be suitable for the advantages that batch production in batches.
Description
Technical field
The invention belongs to fiber grating sensing technology fields, are related to a kind of fiber grating pressure sensing being controllably pre-stretched
Device.
Background technique
In recent years, the serious accident in the fields such as water conservancy, petroleum, chemical industry takes place frequently, cause huge economic loss and
Ecological environment destruction, the indirect losses such as social environment influence are even more that can not estimate.And pressure is the neck such as water conservancy, petroleum, chemical industry
The important parameter of domain monitoring and security evaluation.Therefore, pressure sensor is one of sensor mostly important in industrial production.
It is mechanical and electromagnetism class pressure mostly currently used for the pressure sensor of liquids and gases pressure measurement or monitoring
Sensor.Mechanical pressure sensors are chiefly used in the measurement of single point pressure, and measurement data, which can not be transferred in computer, is divided
Analysis processing；Electromagnetism class pressure sensor anti-electromagnetic interference capability is poor, can not be in the adverse circumstances such as inflammable, explosive, strong electromagnetic
Lower long-term safety reliably working, measuring signal are difficult to realize transmit at a distance, can not be concatenated between sensor.Existing optical fiber light
Grid voltage force snesor, the long-term stability that measures is poor, and packaging technology complicated difficult is in laboratory stage mostly, needs to be multiplexed
Further research.
Therefore, the fiber bragg grating pressure sensor that development process is simple, sensitive high, long-time stability are suitble to well engineer application
It is of great significance.
Summary of the invention
To solve the above problems, the invention proposes the fiber bragg grating pressure sensors that one kind is controllably pre-stretched.The sensing
Device realizes fiber grating and is controllably pre-stretched, and solves the measurement stability problem of sensor fiber grating under pressure,
And encapsulation is simple, is suitable for mass production.
Technical solution of the present invention:
A kind of fiber bragg grating pressure sensor being controllably pre-stretched, mainly by shell, pretensioning system, power conversion device and
Sensing arrangement 14 forms；
The shell is mainly made of press-in connection structure 8, perforated sleeve 9 and round tube 10；The press-in connection knot
Structure 8 and perforated sleeve 9 are separately mounted to the both ends of round tube 10, are threadedly coupled with round tube 10, form cylindrical drum enclosed construction；It is described
Press-in connection structure 8 be equipped with hole, the inflow for testing liquid；The perforated sleeve 9 is equipped with hole, is used for tail optical fiber 13
It is connected with fiber Bragg grating (FBG) demodulator；
The power conversion device is mainly made of convoluted diaphragm 1 and transmission rod 2；1 right angle setting of convoluted diaphragm
On the inner wall of round tube 10, round tube 10 is divided for two chambers, and to the junction between 10 inner wall of convoluted diaphragm 1 and round tube into
Row sealing；Testing liquid enters right chamber from the hole in press-in connection structure 8；The transmission rod 2 is located at left chamber, and
One end is fixed on the center of convoluted diaphragm 1；The side wall of transmission rod 2 is equipped with hole, for passing through for tail optical fiber 13；
The pretensioning system, positioned at the left chamber of round tube 10, mainly by fixture nut 4, pre-stretching nut 5, solid
Fixed pole 6 and disk 7 form；The disk 7 is vertically fixedly mounted on the inner wall of round tube 10, and disk 7 is equipped with through-hole in
Heart hole is respectively used to the installation of tail optical fiber 13 passed through with fixed link 6；The fixed link 6 is hollow threaded rod, fixed link 6
Centre bore on disk 7, fixture nut 4 and pre-stretching nut 5 are located at the two sides of disk 7, pass through 4 He of fixture nut
Fixed link 6 is fixed on disk 7 by pre-stretching nut 5；
The sensing arrangement 14 is mainly made of hollow support pipe, fiber grating 3 and protection pipe 12；The optical fiber
Grating 3 is located in protection pipe 12, and the both ends of protection pipe 12 are equipped with hollow support pipe, and fiber grating 3 passes through two hollow support pipes；
One end of two hollow support pipes is separately fixed at the both ends of protection pipe 12, and the other end of one of hollow support pipe is fixed on
In fixed link 6, the other end of another hollow support pipe is fixed in transmission rod 2, the hollow support pipe outside protection pipe 12
It is packaged on outer wall by package metals material；Between fixed link 6 and transmission rod 2, three is located at same protection pipe 12
On horizontal line；Two tail optical fibers 13 of fiber grating 3, are each passed through fixed link 6 and transmission rod 2, then pass through on perforated sleeve 9
Hole is finally connected with fiber Bragg grating (FBG) demodulator.
Diameter, corrugated shape and the wave height of the convoluted diaphragm 1 are according to the requirement of Sensitivity in Pressure Sensors and range
It is chosen.
The material of the round tube 10 and protection pipe 12 is stainless steel.
Effect and benefit of the invention: the present invention realizes fiber grating and is controllably pre-stretched, and improves light under pressured state
Fiber grating sensor measures stability；Its sensor production is simple, high sensitivity, electromagnetism interference, long transmission distance, Ke Yishi
The now series connection between sensor can design different sensitivity and range as needed.
Detailed description of the invention
Fig. 1 is fiber bragg grating pressure sensor schematic diagram of the invention.
Fig. 2 is sensing arrangement schematic diagram.
In figure: 1 convoluted diaphragm；2 transmission rods；3 fiber gratings；4 fixture nuts；5 pre-stretching nuts；6 fixed links；7 disks；
8 press-in connection structures；9 perforated sleeves；10 round tubes；11 package metals materials；12 protection pipes；13 tail optical fibers；14 sensing arrangements.
Specific embodiment
A specific embodiment of the invention is described in detail below in conjunction with technical solution and attached drawing.
As depicted in figs. 1 and 2, a kind of fiber bragg grating pressure sensor being controllably pre-stretched, mainly by shell, pre-stretching system
System, power conversion device and sensing arrangement 14 form.
The both ends of sensing arrangement 14 are packaged using hollow support pipe and package metals material 11, and centre uses protection pipe
One end of fiber grating 3 is passed through transmission rod 2 by 12 protections, and transmission rod 2 is fixed at 1 center of convoluted diaphragm and seals, to prevent wave
The testing liquid leakage of 1 right chamber of line diaphragm influences measurement result；The other end passes through both ends and is equipped with fixture nut 4 and prestretching
The fixed link 6 of nut 5 is stretched, and is fixed；By the 13 incoming fiber optic grating demodulation instrument of tail optical fiber of fiber grating 3, fixed link 6 is turned
The pre-stretching nut 5 of side is pre-stretched sensing arrangement 14, controls 3 wave of fiber grating according to the reading of fiber Bragg grating (FBG) demodulator
Long incrementss.Under pressure, convoluted diaphragm 1 generates the vertical displacement that is directly proportional to the pressure, by transmission rod 2 by ripple
The measurement of vertical displacement is converted into the measurement of the strain of fiber grating 3 at 1 center of diaphragm.
Sensing arrangement 14 is connect with fiber Bragg grating (FBG) demodulator, testing liquid enters from the hole of press-in connection structure 8, and will
Press-in connection structure 8 and testing liquid press-in connection position seal.At this point, testing liquid pressure P suffered by 1 right side of convoluted diaphragm
As testing liquid pressure.Under fluid pressure P effect, transmission rod 2 generates direction and testing liquid pressure side to convoluted diaphragm 1
To opposite concentrated force F, then for sensing arrangement 14 by identical as the direction fluid pressure P, size is the concentrated force of F.Therefore, pass through
The wavelength change for measuring fiber grating 3, can measure testing liquid pressure value.
Claims (3)
1. the fiber bragg grating pressure sensor that one kind is controllably pre-stretched, which is characterized in that the optical fiber light being controllably pre-stretched
Grid voltage force snesor is mainly made of shell, pretensioning system, power conversion device and sensing arrangement (14)；
The shell is mainly made of press-in connection structure (8), perforated sleeve (9) and round tube (10)；The press-in connection
Structure (8) and perforated sleeve (9) are separately mounted to the both ends of round tube (10), are threadedly coupled with round tube (10), form cylindrical drum envelope
Close structure；The press-in connection structure (8) is equipped with hole, the inflow for testing liquid；It is set on the perforated sleeve (9)
There is hole, is connected for tail optical fiber (13) with fiber Bragg grating (FBG) demodulator；
The power conversion device is mainly made of convoluted diaphragm (1) and transmission rod (2)；The convoluted diaphragm (1) is vertically pacified
On the inner wall of round tube (10), round tube (10) is divided into two chambers, and between convoluted diaphragm (1) and round tube (10) inner wall
Junction be sealed；Testing liquid enters right chamber from the hole on press-in connection structure (8)；The transmission rod (2)
Positioned at left chamber, and one end is fixed on the center of convoluted diaphragm (1)；The side wall of transmission rod (2) is equipped with hole, is used for tail
Fine (13) pass through；
The pretensioning system, be located at round tube (10) left chamber, mainly by fixture nut (4), pre-stretching nut (5),
Fixed link (6) and disk (7) composition；The disk (7) is vertically fixedly mounted on the inner wall of round tube (10), on disk (7)
Equipped with through-hole and centre bore, it is respectively used to the installation of tail optical fiber (13) passed through with fixed link (6)；During the fixed link (6) is
Empty threaded rod, fixed link (6) pass through the centre bore on disk (7), and fixture nut (4) and pre-stretching nut (5) are located at
Fixed link (6) is fixed on disk (7) by the two sides of disk (7) by fixture nut (4) and pre-stretching nut (5)；
The sensing arrangement (14) is mainly made of hollow support pipe, fiber grating (3) and protection pipe (12)；The light
Fine grating (3) is located in protection pipe (12), and the both ends of protection pipe (12) are equipped with hollow support pipe, and fiber grating (3) passes through two
Hollow support pipe；One end of two hollow support pipes is separately fixed at the both ends of protection pipe (12), one of hollow support pipe
The other end be fixed in fixed link (6), the other end of another hollow support pipe is fixed in transmission rod (2), protection pipe
(12) it is packaged on the outer wall of external hollow support pipe by package metals material (11)；Protection pipe (12) is located at fixed link
(6) between transmission rod (2), three is located in same horizontal line；Two tail optical fibers (13) of fiber grating (3) are each passed through solid
Fixed pole (6) and transmission rod (2), then pass through the hole on perforated sleeve (9), are finally connected with fiber Bragg grating (FBG) demodulator.
2. the fiber bragg grating pressure sensor that one kind according to claim 1 is controllably pre-stretched, which is characterized in that described
Diameter, corrugated shape and the wave height of convoluted diaphragm (1) are chosen according to the requirement of Sensitivity in Pressure Sensors and range.
3. the fiber bragg grating pressure sensor that one kind according to claim 1 or 2 is controllably pre-stretched, which is characterized in that institute
The material of the round tube (10) and protection pipe (12) stated is stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811136582.0A CN109163843B (en) | 2018-09-28 | 2018-09-28 | Fiber grating pressure sensor with controllable pre-stretching function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811136582.0A CN109163843B (en) | 2018-09-28 | 2018-09-28 | Fiber grating pressure sensor with controllable pre-stretching function |
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| Publication Number | Publication Date |
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| CN109163843A true CN109163843A (en) | 2019-01-08 |
| CN109163843B CN109163843B (en) | 2024-02-06 |
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| CN201811136582.0A Active CN109163843B (en) | 2018-09-28 | 2018-09-28 | Fiber grating pressure sensor with controllable pre-stretching function |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110715764A (en) * | 2019-10-24 | 2020-01-21 | 中互电气(江苏)有限公司 | Sensor with strong moisture-proof capability |
| CN112461417A (en) * | 2020-10-29 | 2021-03-09 | 江苏法尔胜光电科技有限公司 | Mounting structure of fiber grating cable force sensor |
| CN117490003A (en) * | 2024-01-02 | 2024-02-02 | 福伦瑞生科技(苏州)有限公司 | Oil-sensing optical fiber sensing system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1334920A (en) * | 1998-12-04 | 2002-02-06 | 塞德拉公司 | Bragg grating pressure sensor |
| US20020141700A1 (en) * | 2001-02-22 | 2002-10-03 | Teraxion Inc. | Adjustable athermal package for optical fiber devices |
| CN103017950A (en) * | 2012-11-26 | 2013-04-03 | 山东大学 | High-sensitivity fiber bragg grating earth pressure gauge |
| CN103033308A (en) * | 2012-12-17 | 2013-04-10 | 中国船舶重工集团公司第七一五研究所 | Fiber grating pressure sensor with temperature real-time fine compensation |
| CN203396446U (en) * | 2013-08-07 | 2014-01-15 | 无锡成电光纤传感科技有限公司 | High-sensitivity fiber bragg grating (FBG) liquid level sensor capable of removing temperature effect |
-
2018
- 2018-09-28 CN CN201811136582.0A patent/CN109163843B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1334920A (en) * | 1998-12-04 | 2002-02-06 | 塞德拉公司 | Bragg grating pressure sensor |
| US20020141700A1 (en) * | 2001-02-22 | 2002-10-03 | Teraxion Inc. | Adjustable athermal package for optical fiber devices |
| CN103017950A (en) * | 2012-11-26 | 2013-04-03 | 山东大学 | High-sensitivity fiber bragg grating earth pressure gauge |
| CN103033308A (en) * | 2012-12-17 | 2013-04-10 | 中国船舶重工集团公司第七一五研究所 | Fiber grating pressure sensor with temperature real-time fine compensation |
| CN203396446U (en) * | 2013-08-07 | 2014-01-15 | 无锡成电光纤传感科技有限公司 | High-sensitivity fiber bragg grating (FBG) liquid level sensor capable of removing temperature effect |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110715764A (en) * | 2019-10-24 | 2020-01-21 | 中互电气(江苏)有限公司 | Sensor with strong moisture-proof capability |
| CN110715764B (en) * | 2019-10-24 | 2021-05-25 | 中互电气(江苏)有限公司 | Sensor with strong moisture-proof capability |
| CN112461417A (en) * | 2020-10-29 | 2021-03-09 | 江苏法尔胜光电科技有限公司 | Mounting structure of fiber grating cable force sensor |
| CN117490003A (en) * | 2024-01-02 | 2024-02-02 | 福伦瑞生科技(苏州)有限公司 | Oil-sensing optical fiber sensing system |
| CN117490003B (en) * | 2024-01-02 | 2024-03-12 | 福伦瑞生科技(苏州)有限公司 | Oil-sensing optical fiber sensing system |
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| CN109163843B (en) | 2024-02-06 |
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