CN208751777U - 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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- CN208751777U CN208751777U CN201821588422.5U CN201821588422U CN208751777U CN 208751777 U CN208751777 U CN 208751777U CN 201821588422 U CN201821588422 U CN 201821588422U CN 208751777 U CN208751777 U CN 208751777U
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- round tube
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- stretched
- transmission rod
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Abstract
The utility model belongs to fiber grating sensing technology field, is 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 benefit of the utility model is: the sensor structure is simple, easy to make, corrosion-resistant, electromagnetism interference, and 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 utility model belongs to fiber grating sensing technology field, is related to a kind of fiber grating pressure biography being controllably pre-stretched
Sensor.
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.
Utility model content
The fiber bragg grating pressure sensor that one kind that in order to solve the above problems, the utility model proposes is controllably pre-stretched.It should
Sensor realizes fiber grating and is controllably pre-stretched, and the measurement stability for solving sensor fiber grating under pressure is asked
Topic, and encapsulate simply, it is suitable for mass production.
The technical solution of the utility model includes:
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.
The effect and benefit of the utility model: the utility model realizes fiber grating and is controllably pre-stretched, and improves compression
Fiber-optic grating sensor measures stability under state；Its sensor production is simple, high sensitivity, electromagnetism interference, transmission range
Far, the series connection between sensor may be implemented, different sensitivity and range can be designed as needed.
Detailed description of the invention
Fig. 1 is the fiber bragg grating pressure sensor schematic diagram of the utility model.
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
Specific embodiment of the present utility model 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 |
|---|---|---|---|
| CN201821588422.5U CN208751777U (en) | 2018-09-28 | 2018-09-28 | A kind of fiber bragg grating pressure sensor being controllably pre-stretched |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821588422.5U CN208751777U (en) | 2018-09-28 | 2018-09-28 | A kind of fiber bragg grating pressure sensor being controllably pre-stretched |
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| Publication Number | Publication Date |
|---|---|
| CN208751777U true CN208751777U (en) | 2019-04-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821588422.5U Expired - Fee Related CN208751777U (en) | 2018-09-28 | 2018-09-28 | A kind of fiber bragg grating pressure sensor being controllably pre-stretched |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114136349A (en) * | 2021-11-16 | 2022-03-04 | 西安交通大学 | High-temperature-resistant Bragg fiber grating sensor with variable sensing quantity and preparation method thereof |
-
2018
- 2018-09-28 CN CN201821588422.5U patent/CN208751777U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114136349A (en) * | 2021-11-16 | 2022-03-04 | 西安交通大学 | High-temperature-resistant Bragg fiber grating sensor with variable sensing quantity and preparation method thereof |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190416 Termination date: 20210928 |
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| CF01 | Termination of patent right due to non-payment of annual fee |