CN103674319B - A kind of gas pressure type Fiber Bragg Grating Temperature sensor and using method thereof - Google Patents
A kind of gas pressure type Fiber Bragg Grating Temperature sensor and using method thereof Download PDFInfo
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- CN103674319B CN103674319B CN201310666709.0A CN201310666709A CN103674319B CN 103674319 B CN103674319 B CN 103674319B CN 201310666709 A CN201310666709 A CN 201310666709A CN 103674319 B CN103674319 B CN 103674319B
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- temperature
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Abstract
The present invention relates to a kind of gas pressure type Fiber Bragg Grating Temperature sensor and using method thereof, belong to technical field of photoelectron measurement components.Including gas pressure temperature sensing device and optical fiber Bragg raster pressure conversion device, gas pressure temperature sensing device is connected capillary tube and interlayer diaphragm by the variations in temperature pressure sensitive bag sealed；The main body of optical fiber Bragg raster pressure conversion device is to be provided with the equi intensity cantilever of optical fiber Bragg raster, the pressure that one end of equi intensity cantilever is sensed by interlayer diaphragm transmission gas pressure temperature sensing device.Variations in temperature pressure sensitive bag is positioned under the temperature environment needing to measure, according to the test environment temperature set upTWith optical fiber Bragg raster wavelength-shift Δλ B1,2Between mathematical model, it is achieved the real time on-line monitoring to dut temperature.
Description
Technical field
The present invention relates to a kind of gas pressure type Fiber Bragg Grating Temperature sensor and using method thereof, belong to photoelectron
Measure device arts.
Background technology
Temperature is to describe the state parameter of material thermal property.Along with the development of science and technology and entering of modern industrial technology
Step, in industrial many fields, constantly improves thermometric requirement.Particularly high-risk to oil, chemical industry etc.
Temperature detection in environment, it is desirable to temperature sensor has the features such as high security, good insulating properties, electromagnetism interference.Pass
The temperature sensor based on signal of telecommunication transmission of system is difficult to the application needs meeting in high-risk environment.Intrinsic safety characteristic due to optical fiber
Become the thermometric study hotspot of high-risk environment.
With the present invention closest to temperature sensor be that " a kind of gas thermometer " (sees document: Mao Chen, " a kind of gas
Thermometer body ", patent of invention description, on August 10th, 2012, Authorization Notice No.: CN 102798478A).This technology utilizes storage
The expanded by heating of balloon interior gas drives the motion of its internal thin skin, the motion of the motion of thin skin driven rod therewith,
Laser instrument is installed on bar, utilizes laser instrument by spot projection to graduated disc, it is achieved the measurement to temperature.Owing to it is rotating
Laser instrument is installed on bar so that it is use inflammable at oil, chemical industry etc., hazardous applications is restricted.
Summary of the invention
The present invention provides a kind of gas pressure type Fiber Bragg Grating Temperature sensor and using method, range of application
Extensively, apparatus structure is simple.
Sensor of the invention structure is: include gas pressure temperature sensing device and the conversion of optical fiber Bragg raster pressure
Device, gas pressure temperature sensing device is connected capillary tube 8 and interlayer diaphragm 6 by the variations in temperature pressure sensitive bag 10 sealed；
The main body of optical fiber Bragg raster pressure conversion device is to be provided with the equi intensity cantilever 1 of optical fiber Bragg raster 2, and equal strength is hanged
The pressure that gas pressure temperature sensing device senses is transmitted, by interlayer diaphragm 6, in one end of arm beam 1；Optical fiber Bragg raster 2 with
External optical cable 13 connects the signal that transmission senses.
Being rigidly connected by pressure transmission bar 4 between described equi intensity cantilever 1 and interlayer diaphragm 6, interlayer diaphragm 6 passes through capillary
Pipe adaptor 6 is tightly connected with capillary tube 8.
Having housing 3 outside described optical fiber Bragg raster pressure conversion device, optical fiber Bragg raster 2 is internal by housing 3
Fairlead 12 be connected with external optical cable 13, with epoxy resin, fairlead 12 is sealed.Equi intensity cantilever 1 is by propping up
Frame 5 is fixed on housing 3.
Described variations in temperature pressure sensitive bag 10 is tightly connected with capillary tube 8 by nipple 9.
Described optical fiber Bragg raster 2 is pasted onto on the central axis of equi intensity cantilever 1 upper and lower surface.
The using method of the gas pressure type Fiber Bragg Grating Temperature sensor of the present invention is:
(1) variations in temperature pressure sensitive bag 10 is positioned over need measure temperature environment under, the gas in thermometer bulb due to
Expand with heat and contract with cold and cause air pressure inside to change, obtain acting on interlayer diaphragm 6 according to The Ideal-Gas Equation PV=nRT
Pressure F1 be:
In formula, P is the pressure of working gas, and S is the area bearing pressure, and V is Instrument package closed system volume, and R is pervasive
Gas constant (R=8.3114 m3*pa/mol*K), T is working gas temperature, is approximately equal to measured medium
Temperature；N is the amount of the material of gas in thermometer bulb；
(2) the pressure F on interlayer diaphragm 6 is acted on due to one end of pressure transmission bar 41Be applied to equi intensity cantilever 1
On power F2Being equivalent, the relation thus obtaining equi intensity cantilever axial strain Δ ε and temperature T is:
Eliminate the impact of ambient temperature, the wavelength-shift of the optical fiber Bragg raster of upper and lower surface is subtracted each other, obtains by thermometric
Degree T and optical fiber Bragg raster centre wavelength shifts delta λB12Relation be:
In formula, SεFor strain sensitive coefficient；STFor temperature-sensitivity coefficient；Δ ε is axial strain variable quantity；Δ T is that temperature becomes
Change amount；λBFor optical fiber Bragg raster centre wavelength；L: for the length of equi intensity cantilever.
The measuring principle of gas pressure type Fiber Bragg Grating Temperature sensor of the present invention is: due to gas in thermometer bulb
Amount is definite value, according to The Ideal-Gas Equation:
(1)
Wherein, the pressure of P: working gas；V: Instrument package closed system volume；R: universal gas constant (R=8.3114 m3*
Pa/mol*K)；T: working gas temperature, is approximately equal to the temperature of measured medium；N: the amount of the material of gas in thermometer bulb.
When thermometer bulb is placed in the temperature environment needing to measure, the gas in thermometer bulb causes internal gas owing to expanding with heat and contract with cold
Pressure changes, and according to The Ideal-Gas Equation PV=nRT, transmits through capillary tube, acts on the pressure on interlayer diaphragm
F1For:
(2)
One end of pressure transmission bar is rigidly connected with interlayer diaphragm, and the other end is rigidly connected with equi intensity cantilever free end, makees
The pressure F being used on interlayer diaphragm1Transmit through pressure transmission bar, be applied to the free end of equi intensity cantilever, be its generation etc.
The directed force F of value2
F1=F2 (3)
When one power F of equi intensity cantilever free end effect2Time, its axial strain Δ ε and power F2Relation be:
(4)
Wherein, the elastic modelling quantity of E: equi intensity cantilever；b0: equi intensity cantilever fixes the width of end；H: equal strength is hanged
The thickness of arm beam；L: for the length of equi intensity cantilever.
Due to F1=F2, so formula (4) can be equivalent to:
(5)
Formula (2) is substituted into formula (5) relation of equi intensity cantilever axial strain and temperature T can be obtained and be:
(6)
Optical fiber Bragg raster is with equi intensity cantilever deformation, if variations in temperature Δ T during Ce Lianging, then strain and temperature
The wavelength-shift amount Δ λ of the optical fiber Bragg raster that degree causesBFor
(7)
Wherein Sε: strain sensitive coefficient；ST: temperature-sensitivity coefficient；Δ ε: axial strain variable quantity；Δ T: variations in temperature
Amount；λB: optical fiber Bragg raster centre wavelength.
The optical fiber Bragg raster of two same models that will be pasted onto on equi intensity cantilever upper and lower centre of surface axis
Wavelength-shift subtract each other, the impact of ambient temperature can be eliminated, obtain only effects of strain time optical fiber Bragg raster centre wavelength move
Position is:
(8)
Wherein Δ λB1,2: the wavelength-shift difference of two optical fiber Bragg rasters of the upper and lower surface mount of equi intensity cantilever；
ΔλB1With Δ λB2It is respectively the wavelength-shift of two optical fiber Bragg rasters of the upper and lower surface mount of equi intensity cantilever.
Formula (8) is substituted into formula (4) equi intensity cantilever free end directed force F can be obtained2With optical fiber Bragg raster
The relation of centre wavelength displacement is:
(9)
Formula (8) is substituted into the available dut temperature T of formula (6) and optical fiber Bragg raster centre wavelength shifts delta λB1,2
Relation be:
(10)
Formula (10) indicates test environment temperature T and optical fiber Bragg raster wavelength-shift Δ λB1,2Between mathematical model,
Test environment temperature just can be calculated by measuring optical fiber Bragg raster wavelength-shift.
The invention has the beneficial effects as follows:
(1) can remote temperature measurement.Owing to using capillary tube to connect temperature measuring unit and pneumatic converting unit, can be according to various
The length of the capillary tube that different requirements is reasonable in design, avoids optical fiber Bragg raster and tested extreme temperature close contact, from
And reduce the impact on actual thermometric of the tested extreme temperature；
(2) different types of thermometer bulb can be selected according to different thermometric conditions, it is achieved measure scope, sensitivity of thermometry
Adjustable；
(3) this temperature sensor itself is without any signal of telecommunication, is applicable to the inflammable and explosive temperature waited in high-risk environment
Detection.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the partial schematic diagram that moderate strength cantilever beam of the present invention connects.
In figure: 1-equi intensity cantilever, 2-optical fiber Bragg raster, 3-housing, 4-pressure transmission bar, 5-support, 6-interlayer film
Sheet, 7-capillary tube adaptor, 8-capillary tube, 9-nipple, 10-variations in temperature pressure sensitive bag, 11-screw, 12-draw
Hole, the external optical cable of 13-.
Detailed description of the invention
Below in conjunction with the accompanying drawings and detailed description of the invention, the invention will be further described.
Embodiment one: as it is shown in figure 1, the structure of the gas pressure type Fiber Bragg Grating Temperature sensor of the present invention:
Including gas pressure temperature sensing device and optical fiber Bragg raster pressure conversion device, gas pressure temperature sensing device is by close
The variations in temperature pressure sensitive bag 10 of envelope connects capillary tube 8 and interlayer diaphragm 6；The master of optical fiber Bragg raster pressure conversion device
Body is the equi intensity cantilever 1 being provided with optical fiber Bragg raster 2, and one end of equi intensity cantilever 1 is transmitted by interlayer diaphragm 6
The pressure that gas pressure temperature sensing device senses；Optical fiber Bragg raster 2 is connected the letter that transmission senses with external optical cable 13
Number.Being rigidly connected by pressure transmission bar 4 between equi intensity cantilever 1 and interlayer diaphragm 6, interlayer diaphragm 6 is by capillary tube adaptor 6
It is tightly connected with capillary tube 8.Housing 3, optical fiber Bragg raster 2 is had to pass through housing outside optical fiber Bragg raster pressure conversion device
Fairlead 12 within 3 is connected with external optical cable 13, seals fairlead 12 with epoxy resin.Equi intensity cantilever 1
It is fixed on housing 3 by support 5.Variations in temperature pressure sensitive bag 10 is tightly connected with capillary tube 8 by nipple 9.Light
Fiber Bragg grating 2 is pasted onto on the central axis of equi intensity cantilever 1 upper and lower surface.
The using method of the gas pressure type Fiber Bragg Grating Temperature sensor of the present invention is:
(1) variations in temperature pressure sensitive bag 10 is positioned over need measure temperature environment under, the gas in thermometer bulb due to
Expand with heat and contract with cold and cause air pressure inside to change, obtain acting on interlayer diaphragm 6 according to The Ideal-Gas Equation PV=nRT
Pressure F1 be:
In formula, P is the pressure of working gas, and S is the area bearing pressure, and V is Instrument package closed system volume, and R is pervasive
Gas constant (R=8.3114 m3*pa/mol*K), T is working gas temperature, is approximately equal to measured medium
Temperature；N is the amount of the material of gas in thermometer bulb；
(2) the pressure F on interlayer diaphragm 6 is acted on due to one end of pressure transmission bar 41Be applied to equi intensity cantilever 1
On power F2Being equivalent, the relation thus obtaining equi intensity cantilever axial strain Δ ε and temperature T is:
Eliminate the impact of ambient temperature, the wavelength-shift of the optical fiber Bragg raster of upper and lower surface is subtracted each other, obtains by thermometric
Degree T and optical fiber Bragg raster centre wavelength shifts delta λB12Relation be:
In formula, SεFor strain sensitive coefficient；STFor temperature-sensitivity coefficient；Δ ε is axial strain variable quantity；Δ T is that temperature becomes
Change amount；λBFor optical fiber Bragg raster centre wavelength；L: for the length of equi intensity cantilever
The design parameter that the present invention relates to is: degree cantilever beam dimensional parameters is: l=50 mm, h=0.3 mm, b0=20 mm；
Equi intensity cantilever material parameter is: Young ' the s modulus of 45# steel is E=200 GPa；Thermometer bulb dimensional parameters: Φ 14*150 mm
Cylinder；The technical parameter of optical fiber Bragg raster is: central wavelength lambdaB=1551 nm, strain sensitive coefficient Sε=0.78*10-6
με-1, temperature-sensitivity coefficient ST=6.0*10-6℃-1；
Being shown by the Theoretical Calculation of above-mentioned formula, the temperature control of this temperature sensor is 10.2pm/ DEG C；Work as optical fiber
When the wavelength discrimination of Bragg grating demodulation instrument is 1pm, the temperature resolving power of this sensor is 0.098 DEG C.
Embodiment two: as it is shown in figure 1, the structure of the gas pressure type Fiber Bragg Grating Temperature sensor of the present invention:
Including gas pressure temperature sensing device and optical fiber Bragg raster pressure conversion device, gas pressure temperature sensing device is by close
The variations in temperature pressure sensitive bag 10 of envelope connects capillary tube 8 and interlayer diaphragm 6；The master of optical fiber Bragg raster pressure conversion device
Body is the equi intensity cantilever 1 being provided with optical fiber Bragg raster 2, and one end of equi intensity cantilever 1 is transmitted by interlayer diaphragm 6
The pressure that gas pressure temperature sensing device senses；Optical fiber Bragg raster 2 is connected the letter that transmission senses with external optical cable 13
Number.Being rigidly connected by pressure transmission bar 4 between equi intensity cantilever 1 and interlayer diaphragm 6, interlayer diaphragm 6 is by capillary tube adaptor 6
It is tightly connected with capillary tube 8.Housing 3, optical fiber Bragg raster 2 is had to pass through housing outside optical fiber Bragg raster pressure conversion device
Fairlead 12 within 3 is connected with external optical cable 13, seals fairlead 12 with epoxy resin.Equi intensity cantilever 1
It is fixed on housing 3 by support 5.Optical fiber Bragg raster 2 is pasted onto on the central axis of equi intensity cantilever 1 upper and lower surface.
The using method of the gas pressure type Fiber Bragg Grating Temperature sensor of the present invention is:
(1) variations in temperature pressure sensitive bag 10 is positioned over need measure temperature environment under, the gas in thermometer bulb due to
Expand with heat and contract with cold and cause air pressure inside to change, obtain acting on interlayer diaphragm 6 according to The Ideal-Gas Equation PV=nRT
Pressure F1 be:
In formula, P is the pressure of working gas, and S is the area bearing pressure, and V is Instrument package closed system volume, and R is pervasive
Gas constant (R=8.3114 m3*pa/mol*K), T is working gas temperature, is approximately equal to measured medium
Temperature；N is the amount of the material of gas in thermometer bulb；
(2) the pressure F on interlayer diaphragm 6 is acted on due to one end of pressure transmission bar 41Be applied to equi intensity cantilever 1
On power F2Being equivalent, the relation thus obtaining equi intensity cantilever axial strain Δ ε and temperature T is:
Eliminate the impact of ambient temperature, the wavelength-shift of the optical fiber Bragg raster of upper and lower surface is subtracted each other, obtains by thermometric
Degree T and optical fiber Bragg raster centre wavelength shifts delta λB12Relation be:
In formula, SεFor strain sensitive coefficient；STFor temperature-sensitivity coefficient；Δ ε is axial strain variable quantity；Δ T is that temperature becomes
Change amount；λBFor optical fiber Bragg raster centre wavelength；L: for the length of equi intensity cantilever
Above in association with accompanying drawing, the detailed description of the invention of the present invention is explained in detail, but the present invention is not limited to above-mentioned
Embodiment, in the ken that those of ordinary skill in the art are possessed, it is also possible to before without departing from present inventive concept
Put that various changes can be made.
Claims (1)
1. a using method for gas pressure type Fiber Bragg Grating Temperature sensor, this gas pressure type fiber Bragg light
Grid temperature sensor includes gas pressure temperature sensing device and optical fiber Bragg raster pressure conversion device, gas pressure temperature
Induction installation is connected capillary tube (8) and interlayer diaphragm (6) by variations in temperature pressure sensitive bag (10) sealed；Fiber Bragg light
The main body of grid voltage power conversion device is to be provided with the equi intensity cantilever (1) of optical fiber Bragg raster (2), equi intensity cantilever (1)
One end by interlayer diaphragm (6) the transmission pressure that senses of gas pressure temperature sensing device；Optical fiber Bragg raster (2) with
External optical cable (13) connects the signal that transmission senses, it is characterised in that:
Step 1, variations in temperature pressure sensitive bag (10) is positioned over need measure temperature environment under, variations in temperature pressure sensitive
Gas in bag causes air pressure inside to change owing to expanding with heat and contract with cold, and is made according to The Ideal-Gas Equation PV=nRT
The pressure F1 being used on interlayer diaphragm (6) is:
In formula, P is the pressure of working gas, and S is the area bearing pressure, and V is Instrument package closed system volume, and R is common gas
Constant, T is working gas temperature, is approximately equal to the temperature of measured medium；N is the material of gas in variations in temperature pressure sensitive bag
Amount；
Step 2, one end due to pressure transmission bar (4) act on the pressure F on interlayer diaphragm (6)1Be applied to equi intensity cantilever
(1) power F on2Being equivalent, the relation thus obtaining equi intensity cantilever axial strain Δ ε and temperature T is:
Eliminate the impact of ambient temperature, the wavelength-shift of the optical fiber Bragg raster of upper and lower surface is subtracted each other, obtains dut temperature T
With optical fiber Bragg raster centre wavelength shifts delta λB12Relation be:
In formula, SεFor strain sensitive coefficient；STFor temperature-sensitivity coefficient；Δ ε is axial strain variable quantity；Δ T is variations in temperature
Amount；λBFor optical fiber Bragg raster centre wavelength；L: for the length of equi intensity cantilever；The elastic modelling quantity of E: equi intensity cantilever；
b0: equi intensity cantilever fixes the width of end；The thickness of h: equi intensity cantilever.
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| CN110530548B (en) * | 2019-08-02 | 2020-08-18 | 西安交通大学 | Fiber grating detection method and device for measuring pressure and temperature parameters |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87213747U (en) * | 1987-09-24 | 1988-06-15 | 富阳仪表厂 | Flat spring tube pressure type thermometer |
| CN2476803Y (en) * | 2001-05-11 | 2002-02-13 | 华军 | Capillary tube of pressure thermometer |
| CN1948914A (en) * | 2005-10-13 | 2007-04-18 | 中国科学院半导体研究所 | Optical fibre grating sensor based on Bourdon tube as energy changer and method thereof |
| CN102798478A (en) * | 2012-08-10 | 2012-11-28 | 毛陈 | Gas thermometer |
| CN203758643U (en) * | 2013-12-11 | 2014-08-06 | 昆明理工大学 | Gas pressure type optical fiber Bragg grating temperature sensor |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU3111900A (en) * | 1998-12-04 | 2000-06-19 | Cidra Corporation | Pressure-isolated bragg grating temperature sensor |
| JP2001155268A (en) * | 1999-11-25 | 2001-06-08 | Hitachi Cable Ltd | Optical type temperature and fire sensor |
-
2013
- 2013-12-11 CN CN201310666709.0A patent/CN103674319B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87213747U (en) * | 1987-09-24 | 1988-06-15 | 富阳仪表厂 | Flat spring tube pressure type thermometer |
| CN2476803Y (en) * | 2001-05-11 | 2002-02-13 | 华军 | Capillary tube of pressure thermometer |
| CN1948914A (en) * | 2005-10-13 | 2007-04-18 | 中国科学院半导体研究所 | Optical fibre grating sensor based on Bourdon tube as energy changer and method thereof |
| CN102798478A (en) * | 2012-08-10 | 2012-11-28 | 毛陈 | Gas thermometer |
| CN203758643U (en) * | 2013-12-11 | 2014-08-06 | 昆明理工大学 | Gas pressure type optical fiber Bragg grating temperature sensor |
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