CN208998991U - A pressure sensor using fiber grating - Google Patents
A pressure sensor using fiber grating Download PDFInfo
- Publication number
- CN208998991U CN208998991U CN201821746634.1U CN201821746634U CN208998991U CN 208998991 U CN208998991 U CN 208998991U CN 201821746634 U CN201821746634 U CN 201821746634U CN 208998991 U CN208998991 U CN 208998991U
- Authority
- CN
- China
- Prior art keywords
- copper
- fiber grating
- bent pipe
- hollow bent
- fiber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000000835 fiber Substances 0.000 title claims abstract description 42
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 44
- 229910052802 copper Inorganic materials 0.000 claims abstract description 44
- 239000010949 copper Substances 0.000 claims abstract description 44
- 239000002184 metal Substances 0.000 claims abstract description 39
- 229910052751 metal Inorganic materials 0.000 claims abstract description 39
- 230000001012 protector Effects 0.000 claims abstract description 22
- 230000001681 protective effect Effects 0.000 claims description 4
- 239000007788 liquid Substances 0.000 description 7
- 239000013307 optical fiber Substances 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000010892 electric spark Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Landscapes
- Measuring Fluid Pressure (AREA)
Abstract
A kind of pressure sensor using fiber grating, is related to pressure sensor.Equipped with sensor protection shell, copper hollow bent pipe, pipe joint, copper metal block, upper metal protection protector, lower metal protection protector, fiber grating and fiber boot；The sensor protection shell is located at the periphery of copper hollow bent pipe, pipe joint, copper metal block, upper metal protection protector, lower metal protection protector and fiber grating; the copper hollow bent pipe is connected with pipe joint, and upper metal protection protector and lower metal protection protector are connect with copper hollow bent pipe end and copper metal block respectively；Fiber grating is connect with one end of the upper port of copper hollow bent pipe and copper metal block respectively, and fiber optic protection is set in the top of sensor protection shell.The linear change that can more preferably guarantee strain path raster center wavelength without the scheme of stickup, obtains more accurate measured value.
Description
Technical field
The utility model relates to pressure sensors, change fiber grating more particularly, to by liquid or gas pressure change
A kind of pressure sensor using fiber grating of strain.
Background technique
Fiber grating is to introduce periodic variations in refractive index in fiber cores area by UV light to realize.Work as list
When the mode fiber core area variations in refractive index period is smaller, fl transmission basic mode can be made to couple with the basic mode of reverse transfers and shift big portion
Divide power, this fiber grating is referred to as optical fiber Bragg (fiber Bragg grating, FBG) grating, and meets this energy
The optical wavelength of amount conversion or resonance is referred to as that Fiber Bragg lattice wave is long or fiber bragg grating center wavelength.
Traditional gas or liquid pressure measurement device be by elastic element in pressure change change in shape, drive phase
Indicators turn is closed, or exports electronic type strain transducer mounted thereto and changes and realize.Pass through indicators turn
Pressure size can only be read relatively coarsely, and pressure value can not be acquired and be transmitted；Electronic pressure sensor signal needs
Corresponding circuit acquisition and transmission not can guarantee that power supply, environment electromagnetics interference is larger, the numerous wirings of number of sensors are multiple certain
Miscellaneous, inflammable and explosive environment, signal transmission distance farther out when, electronic pressure sensor has larger tired in practical applications
It is difficult.
There is fibre optical sensor sensing head can pass through one without power supply, not by environment electromagnetics wave interference, multiple sensors
Optical fiber series demultiplex, sensing head do not generate the advantages that electric spark is perfectly safe, can transmit at a distance, and application has in certain environments
Biggish advantage.Carrying out pressure sensing working principle using fiber grating is that fiber grating installation can be generated displacement by pressure
Or in the mechanical structure of strain.When pressure change, mechanical structure variation makes the strain of fiber grating change, to make light
The period of fine grating and central wavelength change, and ([1] Wu Yonghong, Qu Wenjun, Shao Changjiang, Zhou Wei, Cai Haiwen fiber grating is answered
Become sensor light-power conversion theoretical equation [J] Acta Optica, 2009,29 (08): 2067-2070；[2] Hu Zhixin, Zhu Jun,
The novel Fiber Grating Pressure Sensing System with High Accuracy of Zhang Ling [J] photonics journal, 2006 (05): 709-711).Due to light wave
Transmission loss very little in a fiber, therefore sensor and optical wavelength can be changed by the optical fiber of very long (several kilometers or longer)
Detecting instrument ((FBG) demodulator) connection, realizes remote recording and measurement.
Summary of the invention
The purpose of this utility model is to provide the one kind for changing fiber grating strain by liquid or gas pressure change
Using the pressure sensor of fiber grating.
Unless otherwise noted, fiber grating described in the utility model refers both to Fiber Bragg Grating.
The utility model is equipped with sensor protection shell, copper hollow bent pipe, pipe joint, copper metal block, upper metal and protects
Sheath, lower metal protection protector, fiber grating and fiber boot；The sensor protection shell is located at copper hollow bent pipe, pipeline
The periphery of interface, copper metal block, upper metal protection protector, lower metal protection protector and fiber grating, the copper hollow bent pipe with
Pipe joint is connected, and upper metal protection protector and lower metal protection protector connect with copper hollow bent pipe end and copper metal block respectively
It connects；Fiber grating is connect with one end of the upper port of copper hollow bent pipe and copper metal block respectively, and fiber optic protection is set in biography
The top of sensor protective shell.
The pipe joint of the size pipeline of M14 × 1.5 interface or other specifications can be used in the pipe joint.
After the utility model accesses tested point, testing liquid or gas are entered in copper hollow bent pipe by pipe joint,
When pressure is continuously increased in copper hollow bent pipe, copper hollow bent pipe has the trend that deformation stretches, to drive optical fiber light
The stretching of grid causes the variation of optic fiber grating wavelength, demodulates the variation of pressure in copper hollow bent pipe, and the utility model passes through
Liquid or gas pressure change change the strain of fiber grating.With the method for pasting fiber grating directly on elastic strain material
It compares, the utility model can more preferably guarantee the linear change of strain path raster center wavelength without the scheme of stickup, obtain
More accurate measured value.
Detailed description of the invention
Fig. 1 is the structure composition schematic diagram of the utility model embodiment.
Fig. 2 is the typical measurement curve of the utility model embodiment.
Specific embodiment
Following embodiment will be further described the utility model in conjunction with attached drawing.
As illustrated in fig. 1 and 2, the utility model embodiment is equipped with sensor protection shell 1, copper hollow bent pipe 2, M14 × 1.5
Size pipeline interface 3, copper metal block 4, upper metal protection protector 5, lower metal protection protector 6, Fiber Bragg Grating 7 and optical fiber are protected
Sheath 8；The sensor protection shell 1 be located at copper hollow bent pipe 2, pipe joint 3, copper metal block 4, upper metal protection protector 5,
The periphery of lower metal protection protector 6 and Fiber Bragg Grating 7, the copper hollow bent pipe 2 are connected with pipe joint 3, upper gold
Belong to protective case 5 and lower metal protection protector 6 is connect with 2 end of copper hollow bent pipe and copper metal block 4 respectively；Optical fiber Bragg light
Grid 7 are connect with one end of the upper port of copper hollow bent pipe 2 and copper metal block 4 respectively, and fiber boot 8 is located at sensor guarantor
The top of protective case 1.
Fig. 2 provides the typical measurement curve of the utility model embodiment, in use, after the utility model access tested point,
Testing liquid or gas can be entered in copper hollow bent pipe 2 by the size pipeline of M14 × 1.5 interface 3, when copper hollow bent pipe 2
When interior pressure is continuously increased, copper hollow bent pipe 2 has the trend that deformation stretches, to drive the drawing of Fiber Bragg Grating 7
It stretches, causes the variation of 7 wavelength of Fiber Bragg Grating, demodulate the variation of pressure in copper hollow bent pipe 2, pass through liquid or gas
The strain of body pressure change change Fiber Bragg Grating 7.
Claims (2)
1. a kind of pressure sensor using fiber grating, it is characterised in that be equipped with sensor protection shell, copper hollow bent pipe, pipe
Pipeline joint, copper metal block, upper metal protection protector, lower metal protection protector, fiber grating and fiber boot；The sensor is protected
Protective case is located at copper hollow bent pipe, pipe joint, copper metal block, upper metal protection protector, lower metal protection protector and fiber grating
Periphery, the copper hollow bent pipe is connected with pipe joint, upper metal protection protector and lower metal protection protector respectively with copper
Hollow bent pipe end is connected with copper metal block；Fiber grating respectively with the upper port of copper hollow bent pipe and copper metal block
One end connection, fiber optic protection are set in the top of sensor protection shell.
2. a kind of pressure sensor using fiber grating as described in claim 1, it is characterised in that the pipe joint uses
The pipe joint of the specification of M14 × 1.5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821746634.1U CN208998991U (en) | 2018-10-26 | 2018-10-26 | A pressure sensor using fiber grating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821746634.1U CN208998991U (en) | 2018-10-26 | 2018-10-26 | A pressure sensor using fiber grating |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208998991U true CN208998991U (en) | 2019-06-18 |
Family
ID=66805542
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821746634.1U Expired - Fee Related CN208998991U (en) | 2018-10-26 | 2018-10-26 | A pressure sensor using fiber grating |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208998991U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109238554A (en) * | 2018-10-26 | 2019-01-18 | 厦门大学 | Using the pressure sensor of fiber grating |
-
2018
- 2018-10-26 CN CN201821746634.1U patent/CN208998991U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109238554A (en) * | 2018-10-26 | 2019-01-18 | 厦门大学 | Using the pressure sensor of fiber grating |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190618 Termination date: 20201026 |