CN109238554A - Using the pressure sensor of fiber grating - Google Patents
Using the pressure sensor of fiber grating Download PDFInfo
- Publication number
- CN109238554A CN109238554A CN201811258229.XA CN201811258229A CN109238554A CN 109238554 A CN109238554 A CN 109238554A CN 201811258229 A CN201811258229 A CN 201811258229A CN 109238554 A CN109238554 A CN 109238554A
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- China
- Prior art keywords
- copper
- fiber grating
- bent pipe
- fiber
- hollow bent
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- 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.)
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Classifications
-
- 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
Abstract
Using the pressure sensor of fiber grating, it 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 present invention relates to pressure sensors, change fiber grating strain more particularly, to by liquid or gas pressure change
The pressure sensor using fiber grating.
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,
Open the novel Fiber Grating Pressure Sensing System with High Accuracy of mound [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 the present invention is to provide the use optical fiber for changing fiber grating strain by liquid or gas pressure change
The pressure sensor of grating.
Unless otherwise noted, fiber grating of the present invention refers both to Fiber Bragg Grating.
The present invention be 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 be located at copper hollow bent pipe, pipe joint,
The periphery of copper metal block, upper metal protection protector, lower metal protection protector and fiber grating, the copper hollow bent pipe connect with pipeline
Mouth is connected, and upper metal protection protector and lower metal protection protector are connect with copper hollow bent pipe end and copper metal block respectively；Light
Fine 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 sensor guarantor
The top of protective case.
The pipe joint of the size pipeline of M14 × 1.5 interface or other specifications can be used in the pipe joint.
After the present invention accesses tested point, testing liquid or gas are entered in copper hollow bent pipe by pipe joint, work as copper
When pressure is continuously increased in hollow bent pipe processed, copper hollow bent pipe has the trend that deformation stretches, to drive fiber grating
It stretches, causes the variation of optic fiber grating wavelength, demodulate the variation of pressure in copper hollow bent pipe, the present invention passes through liquid or gas
The strain of body pressure change change fiber grating.Compared with the method for pasting fiber grating directly on elastic strain material, this
Invention can more preferably guarantee the linear change of strain path raster center wavelength without the scheme of stickup, more accurately be measured
Value.
Detailed description of the invention
Fig. 1 is the structure composition schematic diagram of the embodiment of the present invention.
Fig. 2 is the typical measurement curve of the embodiment of the present invention.
Specific embodiment
Following embodiment will the present invention is further illustrated in conjunction with attached drawing.
As illustrated in fig. 1 and 2, the embodiment of the present invention is equipped with sensor protection shell 1, copper hollow bent pipe 2, the specification of M14 × 1.5
Pipe joint 3, copper metal block 4, upper metal protection protector 5, lower metal protection protector 6, Fiber Bragg Grating 7 and fiber boot
8；The sensor protection shell 1 is located at copper hollow bent pipe 2, pipe joint 3, copper metal block 4, upper metal protection protector 5, lower gold
Belong to the periphery of protective case 6 and Fiber Bragg Grating 7, the copper hollow bent pipe 2 is connected with pipe joint 3, and upper metal is protected
Sheath 5 and lower metal protection protector 6 are connect with 2 end of copper hollow bent pipe and copper metal block 4 respectively；Fiber Bragg Grating 7
It is connect respectively with one end of the upper port of copper hollow bent pipe 2 and copper metal block 4, fiber boot 8 is located at sensor protection
The top of shell 1.
Fig. 2 provides the typical measurement curve of the embodiment of the present invention, in use, after the present invention accesses 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 pressure is not in copper hollow bent pipe 2
When disconnected increase, copper hollow bent pipe 2 has the trend that deformation stretches and causes light to drive the stretching of Fiber Bragg Grating 7
The variation of fine 7 wavelength of Bragg grating, demodulates the variation of pressure in copper hollow bent pipe 2, is become by liquid or gas pressure
Change the strain for changing Fiber Bragg Grating 7.
Claims (2)
1. using the pressure sensor of fiber grating, it is characterised in that connect equipped with sensor protection shell, copper hollow bent pipe, pipeline
Mouth, copper metal block, upper metal protection protector, lower metal protection protector, fiber grating and fiber boot；The sensor protection shell
It is located at the outer of copper hollow bent pipe, pipe joint, copper metal block, upper metal protection protector, lower metal protection protector and fiber grating
Week, the copper hollow bent pipe are connected with pipe joint, and upper metal protection protector and lower metal protection protector are hollow with copper respectively
Bend pipe end is connected with copper metal block；Fiber grating one end with the upper port of copper hollow bent pipe and copper metal block respectively
Connection, fiber optic protection are set in the top of sensor protection shell.
2. as described in claim 1 use fiber grating pressure sensor, it is characterised in that the pipe joint using M14 ×
1.5 or other specifications pipe joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811258229.XA CN109238554A (en) | 2018-10-26 | 2018-10-26 | Using the pressure sensor of fiber grating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811258229.XA CN109238554A (en) | 2018-10-26 | 2018-10-26 | Using the pressure sensor of fiber grating |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109238554A true CN109238554A (en) | 2019-01-18 |
Family
ID=65082442
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811258229.XA Pending CN109238554A (en) | 2018-10-26 | 2018-10-26 | Using the pressure sensor of fiber grating |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109238554A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4502336A (en) * | 1982-09-14 | 1985-03-05 | United Technologies Corporation | Pressure measuring device |
| DD272128A1 (en) * | 1988-05-09 | 1989-09-27 | Berlin Treptow Veb K | OPTICAL DEVICE FOR REMOTE MEASUREMENT OF PRESSURE ON THE TUBE FEEDER |
| JP2001033325A (en) * | 1999-07-22 | 2001-02-09 | Hitachi Cable Ltd | Optical pressure sensor |
| CN107462348A (en) * | 2017-09-30 | 2017-12-12 | 南阳理工学院 | For temperature, blast, measuring wind speed multi-parameter optical fiber optical grating sensor |
| CN107907252A (en) * | 2017-10-23 | 2018-04-13 | 沈阳建筑大学 | A kind of lever fiber bragg grating pressure sensor |
| CN208998991U (en) * | 2018-10-26 | 2019-06-18 | 厦门大学 | A kind of pressure sensor using fiber grating |
-
2018
- 2018-10-26 CN CN201811258229.XA patent/CN109238554A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4502336A (en) * | 1982-09-14 | 1985-03-05 | United Technologies Corporation | Pressure measuring device |
| DD272128A1 (en) * | 1988-05-09 | 1989-09-27 | Berlin Treptow Veb K | OPTICAL DEVICE FOR REMOTE MEASUREMENT OF PRESSURE ON THE TUBE FEEDER |
| JP2001033325A (en) * | 1999-07-22 | 2001-02-09 | Hitachi Cable Ltd | Optical pressure sensor |
| CN107462348A (en) * | 2017-09-30 | 2017-12-12 | 南阳理工学院 | For temperature, blast, measuring wind speed multi-parameter optical fiber optical grating sensor |
| CN107907252A (en) * | 2017-10-23 | 2018-04-13 | 沈阳建筑大学 | A kind of lever fiber bragg grating pressure sensor |
| CN208998991U (en) * | 2018-10-26 | 2019-06-18 | 厦门大学 | A kind of pressure sensor using fiber grating |
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