CN105823593A - Fiber grating air pressure sensor - Google Patents
Fiber grating air pressure sensor Download PDFInfo
- Publication number
- CN105823593A CN105823593A CN201610275143.2A CN201610275143A CN105823593A CN 105823593 A CN105823593 A CN 105823593A CN 201610275143 A CN201610275143 A CN 201610275143A CN 105823593 A CN105823593 A CN 105823593A
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- stainless steel
- air pressure
- grating
- diaphragm
- rustless steel
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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
Abstract
The invention discloses a fiber grating air pressure sensor which includes a stainless steel outer cylinder, a stainless steel top cover, a stainless steel bottom cover, a beryllium bronze diaphragm, a stainless steel capillary, a temperature compensated grating, a strain grating and an optical fiber. The stainless steel outer cylinder is packaged with the beryllium bronze diaphragm therein for measuring air pressure and is packaged with the stainless steel capillary for measuring temperature changes, constituting a core sensing part of an air pressure sensor. The beryllium bronze diaphragm is connected to the stainless steel top cover through a diaphragm support, the strain grating, and the stainless steel support. When changes occur to ambient air pressure, flexibility changes that occur to the beryllium bronze diaphragm cause the strain grating to generate axial acting force so as to influence central wavelength changes of the strain grating in order to measure changes to the ambient air pressure. According to the invention, the sensor has the advantages of simple structure, small and light design, and easy use. The sensor can eliminate effect on measuring errors imposed by ambient temperature changes, and has great practical value in monitoring fluids, such as air pressure and hydraulic pressure.
Description
Technical field
Patent of the present invention relates to a kind of baroceptor, particularly relates to apply the fiber grating air pressure sensor in change in fluid pressure such as civil engineering surveying air pressure, hydraulic pressure.
Technical background
At present, sensor technology based on Fiber Bragg Grating FBG (FBG) principle is rapidly developed, fiber grating has advantages such as preventing electromagnetic interference, non-electric detection, anti-lightning, and fiber grating air pressure sensor is applied in measuring such as pipeline gas pressure, underground water level measurement, ground hole water level monitoring and other industrial fluids pressure measxurements.
Owing to field engineering-environment is complicated, when running into vile weather, structure temperature change is fast, it is desirable to baroceptor must possess good heat conductivity energy real-time temperature compensation, to eliminate the variations in temperature impact on pressure measurement；Meanwhile, different engineer applied application requirements pressure measurement precision are high；This sensor construction is novel in design, utilizes fiber grating principle can realize different range high accuracy pressure measurement according to thickness and the diameter of beryllium-bronze diaphragm；Stainless steel capillary can quickly realize temperature conduction, it is ensured that temperature survey does not has hysteresis quality, and greatly eliminating variations in temperature affects the error of pressure measurement.
Patent of invention content
Patent of the present invention provides the deficiency that in measuring, precision is inadequate and temperature-compensating error is big for fluid pressures such as existing technical atmosphere measurements, it is proposed that a kind of fiber grating air pressure sensor.
The technical scheme that patent of the present invention uses is as follows: a kind of fiber grating air pressure sensor, including rustless steel urceolus, stainless steel upper cover, rustless steel lower cover, beryllium-bronze diaphragm, stainless steel capillary, temperature compensation grating, strain grating and optical fiber composition；Described rustless steel urceolus encapsulates beryllium-bronze diaphragm for barometric surveying, encapsulate stainless steel capillary and measure as variations in temperature, collectively constitute the core transducing part of baroceptor；Beryllium-bronze diaphragm is connected with stainless steel upper cover with stainless steel stent by diaphragm support, strain grating；Rustless steel lower cover and rustless steel lower cover are fixed on rustless steel urceolus two ends by screw thread.
The two ends of described strain grating are bonded on stainless steel stent and diaphragm support respectively by 353ND glue, and diaphragm support point is welded on beryllium-bronze diaphragm.
After ambient pressure changes, the amount of deflection change that beryllium-bronze diaphragm produces can cause straining grating and produce axial force, thus affects strain raster center wavelength change to measure the change of ambient pressure.
Described temperature compensation grating is adhesive in stainless steel capillary two ends, measures change of temperature field in rustless steel urceolus, thus eliminates the wavelength change impact of variations in temperature correspondence darkening grid.
Described stainless steel upper cover, rustless steel lower cover, rustless steel urceolus, stainless steel stent, diaphragm support and stainless steel capillary use 304 stainless steel materials to make, to prevent sensor corrosion in life-time service.
Described beryllium-bronze diaphragm uses beryllium-bronze material to make, and is fixed on the inwall of rustless steel urceolus by 353ND glue and rubber o-ring, to play sealing function.
In an assembling process, the first step assembles transducing part, is first welded on beryllium-bronze diaphragm by diaphragm support point；Then by 353ND glue, strain grating being cemented in diaphragm support and the lower end of stainless steel stent and dry, strain grating is placed in the middle.
Temperature compensation grating is through in the middle of stainless steel capillary by second step, keeps pre-stretch-draw 1nm state, and two ends 353ND is gluing solid and dries, and afterwards, and is dried on stainless steel stent by effective for Stainless Steel Capillary 353ND glue bond.
Beryllium-bronze diaphragm 353ND glue bond and is dried on the inwall of rustless steel urceolus by the 3rd step, is embedded in groove by rubber o-ring afterwards；Afterwards, load permeable stone at rustless steel urceolus lower end inside, and rustless steel lower cover is rotated with in rustless steel urceolus lower end by screw thread.
Stainless steel upper cover is first rotated with in rustless steel urceolus upper end by the 4th step, then by the lid centre bore on stainless steel of stainless steel stent card jail, need to adjust stainless steel stent during card jail so that strain grating is in tightens pre-tensile state, and strain raster center wavelength should pre-stretch-draw 1-2nm scope.
Armored end fiber sleeve pipe is rotated with and covers on stainless steel by the 5th step, protects the optical fiber pigtail drawn from stainless steel stent.
After assembling, fiber grating air pressure sensor is carried out temperature calibration and pressure calibration；Temperature calibration area requirement, from-20 DEG C to 85 DEG C, rises gentleness cooling and respectively does twice, every 5 DEG C of records once strain grating wavelength and temperature compensation grating wavelength data, after temperature calibration terminates, calculates the temperature compensation coefficient of this sensor；During pressure calibration, it is desirable to carry out in isoperibol, it is connected with pressure source by the centre bore of rustless steel lower cover, once strains grating wavelength data every 1/20th range record, after pressure calibration terminates, calculate the pressure change coefficient of this sensor.
During engineering uses, it is connected with detected fluid pipeline by rustless steel lower cover centre bore, it is also possible to fiber grating air pressure sensor is directly rendered in tested gas.
Patent structure of the present invention is simple, assembles, easy for installation, is effectively increased the accuracy and sensitivity of pressure measurement, effectively eliminates the ambient temperature change impact on measurement error, have the highest practical value in the fluid pressure monitoring such as air pressure, hydraulic pressure.
Accompanying drawing explanation
Fig. 1 is the principle schematic of patent of the present invention；In figure: 1: optical fiber, 2: armored end fiber sleeve pipe, 3: stainless steel upper cover, 4: rustless steel urceolus, 5: stainless steel stent, 6:353ND glue, 7: temperature compensation grating, 8: stainless steel capillary, 9:353ND glue, 10: strain grating, 11: diaphragm support, 12: beryllium-bronze diaphragm, 13: rubber o-ring, 14: permeable stone, 15: rustless steel lower cover.
Detailed description of the invention
For making the purpose of patent of the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing, patent working mode of the present invention is described in detail.
As shown in Figure 1, a kind of fiber grating air pressure sensor, including rustless steel urceolus (4), stainless steel upper cover (3), rustless steel lower cover (15), beryllium-bronze diaphragm (12), stainless steel capillary (8), temperature compensation grating (7), strain grating (10) and optical fiber composition；Described rustless steel urceolus (4) encapsulates beryllium-bronze diaphragm (12) and is used for barometric surveying, encapsulate stainless steel capillary (8) and measure as variations in temperature, collectively constitute the core transducing part of baroceptor；Beryllium-bronze diaphragm (12) is connected with stainless steel upper cover (3) with stainless steel stent (5) by diaphragm support (11), strain grating (10)；Rustless steel lower cover (15) and rustless steel lower cover (15) are fixed on rustless steel urceolus (4) two ends by screw thread.
The two ends of described strain grating (10) are bonded on stainless steel stent (5) and diaphragm support (11) respectively by 353ND glue (9), and diaphragm support (11) point is welded on beryllium-bronze diaphragm (12).
After ambient pressure changes, the amount of deflection change that beryllium-bronze diaphragm (12) produces can cause straining grating (10) and produce axial force, thus affects strain grating (10) center wavelength variation to measure the change of ambient pressure.
Described temperature compensation grating (7) is adhesive in stainless steel capillary (8) two ends, measures rustless steel urceolus (4) interior change of temperature field, thus eliminates the wavelength change impact of variations in temperature correspondence darkening grid (10).
Described stainless steel upper cover (3), rustless steel lower cover (15), rustless steel urceolus (4), stainless steel stent (5), diaphragm support (11) and stainless steel capillary (8) use 304 stainless steel materials to make, to prevent sensor corrosion in life-time service.
Described beryllium-bronze diaphragm (12) uses beryllium-bronze material to make, and is fixed on the inwall of rustless steel urceolus (4) by 353ND glue and rubber o-ring (13), to play sealing function.
In an assembling process, the first step assembles transducing part, is first welded on beryllium-bronze diaphragm (12) by diaphragm support (11) point；Then strain grating (10) being cemented in diaphragm support (11) and the lower end of stainless steel stent (5) by 353ND glue (9) and dried, strain grating (10) is placed in the middle.
Temperature compensation grating (7) is through in the middle of stainless steel capillary (8) by second step, keep pre-stretch-draw 1nm state, two ends 353ND glue (6) cementation is also dried, afterwards, stainless steel capillary (8) 353ND glue bond above and is dried at stainless steel stent (5).
Beryllium-bronze diaphragm (12) and is dried on the inwall of rustless steel urceolus (4) by the 3rd step with 353ND glue bond, is embedded in groove by rubber o-ring (13) afterwards；Afterwards, load permeable stone (14) at rustless steel urceolus (4) lower end inside, and rustless steel lower cover (15) is rotated with in rustless steel urceolus (4) lower end by screw thread.
Stainless steel upper cover (3) is first rotated with in rustless steel urceolus (4) upper end by the 4th step, then stainless steel stent (5) card jail is covered in (3) centre bore on stainless steel, need to adjust stainless steel stent (5) during card jail, strain grating (10) being in and tightens pre-tensile state, strain grating (10) centre wavelength should pre-stretch-draw 1-2nm scope.
Armored end fiber sleeve pipe (2) is rotated with by the 5th step to be covered on (3) on stainless steel, protects optical fiber (1) tail optical fiber drawn from stainless steel stent (5).
After assembling, fiber grating air pressure sensor is carried out temperature calibration and pressure calibration；Temperature calibration area requirement is from-20 DEG C to 85 DEG C, rise gentleness cooling respectively to do twice, once strain grating (10) wavelength and temperature compensation grating (7) wavelength data every 5 DEG C of records, after temperature calibration terminates, calculate the temperature compensation coefficient of this sensor；During pressure calibration, require to carry out in isoperibol, be connected with pressure source by the centre bore of rustless steel lower cover (15), once strain grating (10) wavelength data every 1/20th range record, after pressure calibration terminates, calculate the pressure change coefficient of this sensor.
During engineering uses, it is connected with detected fluid pipeline by rustless steel lower cover (15) centre bore, it is also possible to fiber grating air pressure sensor is directly rendered in tested gas.
The foregoing is only the preferable embodiment of patent of the present invention, not in order to limit patent of the present invention, within all spirit in patent of the present invention and principle, any modification, equivalent substitution and improvement etc. made, within should be included in the protection domain of patent of the present invention.
Claims (5)
1. a fiber grating air pressure sensor, it is characterised in that: include rustless steel urceolus, stainless steel upper cover, rustless steel lower cover, beryllium-bronze diaphragm, stainless steel capillary, temperature compensation grating, strain grating and optical fiber composition；Described rustless steel urceolus encapsulates beryllium-bronze diaphragm for barometric surveying, encapsulate stainless steel capillary and measure as variations in temperature, collectively constitute the core transducing part of baroceptor；Beryllium-bronze diaphragm is connected with stainless steel upper cover with stainless steel stent by diaphragm support, strain grating；Rustless steel lower cover and rustless steel lower cover are fixed on rustless steel urceolus two ends by screw thread.
A kind of fiber grating air pressure sensor the most according to claim 1, it is characterised in that: the two ends of described strain grating are bonded on stainless steel stent and diaphragm support respectively by 353ND glue, and diaphragm support point is welded on beryllium-bronze diaphragm.
A kind of fiber grating air pressure sensor the most according to claim 1, it is characterized in that: described temperature compensation grating is adhesive in stainless steel capillary two ends, measure change of temperature field in rustless steel urceolus, thus eliminate the wavelength change impact of variations in temperature correspondence darkening grid.
A kind of fiber grating air pressure sensor the most according to claim 1, it is characterized in that: described stainless steel upper cover, rustless steel lower cover, rustless steel urceolus, stainless steel stent, diaphragm support and stainless steel capillary use 304 stainless steel materials to make, to prevent sensor corrosion in life-time service.
A kind of fiber grating air pressure sensor the most according to claim 1, it is characterised in that: described beryllium-bronze diaphragm uses beryllium-bronze material to make, and is fixed on the inwall of rustless steel urceolus by 353ND glue and rubber o-ring, to play sealing function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610275143.2A CN105823593A (en) | 2016-04-28 | 2016-04-28 | Fiber grating air pressure sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610275143.2A CN105823593A (en) | 2016-04-28 | 2016-04-28 | Fiber grating air pressure sensor |
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| CN105823593A true CN105823593A (en) | 2016-08-03 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110174047A (en) * | 2018-10-25 | 2019-08-27 | 山东理工大学 | A kind of back pressure type U-tube gas electric transducer |
| CN110186589A (en) * | 2019-05-15 | 2019-08-30 | 中国葛洲坝集团第一工程有限公司 | A kind of fiber grating temperature sensor and assembly method of high water pressure resistant |
| CN111121716A (en) * | 2020-03-03 | 2020-05-08 | 南通装配式建筑与智能结构研究院 | Fiber grating static level |
| 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 |
| CN113804348A (en) * | 2021-09-22 | 2021-12-17 | 中国核动力研究设计院 | Optical fiber FBG sensor and system for measuring pressure of high-energy pipeline of nuclear power device |
-
2016
- 2016-04-28 CN CN201610275143.2A patent/CN105823593A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110174047A (en) * | 2018-10-25 | 2019-08-27 | 山东理工大学 | A kind of back pressure type U-tube gas electric transducer |
| CN110186589A (en) * | 2019-05-15 | 2019-08-30 | 中国葛洲坝集团第一工程有限公司 | A kind of fiber grating temperature sensor and assembly method of high water pressure resistant |
| CN111121716A (en) * | 2020-03-03 | 2020-05-08 | 南通装配式建筑与智能结构研究院 | Fiber grating static level |
| 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 |
| CN113804348A (en) * | 2021-09-22 | 2021-12-17 | 中国核动力研究设计院 | Optical fiber FBG sensor and system for measuring pressure of high-energy pipeline of nuclear power device |
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Application publication date: 20160803 |