CN103674319A - Gas pressure type optical fiber Bragg grating temperature sensor and application method thereof - Google Patents
Gas pressure type optical fiber Bragg grating temperature sensor and application method thereof Download PDFInfo
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- CN103674319A CN103674319A CN201310666709.0A CN201310666709A CN103674319A CN 103674319 A CN103674319 A CN 103674319A CN 201310666709 A CN201310666709 A CN 201310666709A CN 103674319 A CN103674319 A CN 103674319A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 10
- 239000011229 interlayer Substances 0.000 claims abstract description 30
- 238000006243 chemical reaction Methods 0.000 claims abstract description 14
- 230000005540 biological transmission Effects 0.000 claims description 16
- 230000003287 optical effect Effects 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 7
- 239000003822 epoxy resin Substances 0.000 claims description 4
- 229920000647 polyepoxide Polymers 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 abstract description 4
- 238000013178 mathematical model Methods 0.000 abstract description 2
- 230000006698 induction Effects 0.000 abstract 2
- 238000012544 monitoring process Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 3
- 238000009529 body temperature measurement Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
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- 229910000831 Steel Inorganic materials 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
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Abstract
The invention relates to a gas pressure type optical fiber Bragg grating temperature sensor and an application method thereof and belongs to technical field of photoelectronic measuring devices. The gas pressure type optical fiber Bragg grating temperature sensor comprises a gas pressure temperature sensing device and an optical fiber Bragg grating pressure conversion device. A temperature variation pressure induction package is connected with a capillary tube and an interlayer diaphragm to form the gas pressure temperature sensing device. The optical fiber Bragg grating pressure conversion device mainly comprises a constant-strength cantilever beam provided with an optical fiber Bragg grating. One end of the constant-strength cantilever beam transmits pressure inducted by the gas pressure temperature sensing device through the interlayer diaphragm. The temperature variation pressure induction package is placed in a temperature environment to be measured, and then real-time online monitoring on the temperature to be measured can be achieved according to a mathematical model established between the environment temperature T to be measured and the displacement delta lambda B1 and B2 of the wave length of the optical fiber Bragg grating.
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 measuring element technical field.
Background technology
Temperature is to describe the state parameter of material thermal property.Along with scientific and technical development and the progress of modern industrial technology, in industrial many fields, thermometric requirement is constantly improved.Particularly, to the temperature detection in the high-risk environment such as oil, chemical industry, require temperature sensor to there is the features such as high security, good insulativity, anti-electromagnetic interference (EMI).Traditional temperature sensor based on electric signal transmission is difficult to meet the application needs in high-risk environment.Because the intrinsic safety characteristic of optical fiber becomes the study hotspot of high-risk ambient temperature measurement.
The temperature sensor the most approaching with the present invention is that " a kind of gas thermometer " is (referring to document: hair is old, " a kind of gas thermometer ", patent of invention instructions, on August 10th, 2012, Granted publication number: CN 102798478A).This technology utilizes the expanded by heating of gas storage ball internal gas to drive the motion of its inner thin skin, and the motion of thin skin is the motion of driven rod thereupon, and laser instrument is installed on bar, utilize laser instrument by spot projection to index dial, realize the measurement to temperature.Because it is provided with laser instrument on dwang, it is restricted in uses inflammable, explosive occasion such as oil, chemical industry.
Summary of the invention
The invention provides a kind of gas pressure type Fiber Bragg Grating Temperature sensor and using method thereof, have wide range of applications, apparatus structure is simple.
Sensor construction of the present invention is: comprise gaseous tension temperature sensing device and optical fiber Bragg raster pressure conversion device, gaseous tension temperature sensing device connects kapillary 8 and interlayer diaphragm 6 by the temperature variation pressure sensitive bag 10 sealing; The main body of optical fiber Bragg raster pressure conversion device is the equi intensity cantilever 1 that optical fiber Bragg raster 2 is installed, and the pressure that gaseous tension temperature sensing device senses is transmitted by interlayer diaphragm 6 in one end of equi intensity cantilever 1; Optical fiber Bragg raster 2 is connected the signal that transmission senses with external optical cable 13.
Between described equi intensity cantilever 1 and interlayer diaphragm 6, by pressure transmission bar 4, be rigidly connected, interlayer diaphragm 6 is tightly connected by kapillary adapter 6 and kapillary 8.
There is housing 3 described optical fiber Bragg raster pressure conversion device outside, and optical fiber Bragg raster 2 is connected with external optical cable 13 by the fairlead 12 of housing 3 inside, with epoxy resin, fairlead 12 is sealed.Equi intensity cantilever 1 is fixed on housing 3 by support 5.
Described temperature variation pressure sensitive bag 10 is tightly connected by threaded connector 9 and kapillary 8.
Described optical fiber Bragg raster 2 sticks on the central axis of equi intensity cantilever 1 upper and lower surface.
The using method of gas pressure type Fiber Bragg Grating Temperature sensor of the present invention is:
(1) temperature variation pressure sensitive bag 10 is positioned under the temperature environment that needs to measure, the gas in thermometer bulb causes air pressure inside to change owing to expanding with heat and contract with cold, and the pressure F1 that obtains acting on interlayer diaphragm 6 according to the Ideal-Gas Equation PV=nRT is:
In formula, the pressure that P is working gas, S is the area that bears pressure, and V is Instrument package closed system volume, and R is universal gas constant (R=8.3114 m3*pa/mol*K), and T is working gas temperature, is approximately equal to measured medium
Temperature; N is the amount of substance of gas in thermometer bulb;
(2) one end due to pressure transmission bar 4 acts on the pressure on interlayer diaphragm 6
f 1be applied to equi intensity cantilever 1
On power
f 2be equivalent, obtain thus equi intensity cantilever axial strain Δ
εwith the pass of temperature T be:
Eliminate the impact of environment temperature, the wavelength-shift of the optical fiber Bragg raster of upper and lower surface is subtracted each other, obtain dut temperature
twith optical fiber Bragg raster centre wavelength shifts delta
λ b12
pass be:
In formula,
s εfor strain sensitive coefficient;
s tfor temperature-sensitivity coefficient; Δ
εfor axial strain variable quantity; Δ
tfor temperature variation;
λ b for optical fiber Bragg raster centre wavelength;
l: be the length of equi intensity cantilever.
The measuring principle of gas pressure type Fiber Bragg Grating Temperature sensor of the present invention is: because the amount of gas in thermometer bulb is definite value, according to the Ideal-Gas Equation:
Wherein,
p: the pressure of 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 substance of gas in thermometer bulb.
When thermometer bulb is placed in the temperature environment that needs to measure, the gas in thermometer bulb causes air pressure inside to change owing to expanding with heat and contract with cold, according to the Ideal-Gas Equation
pV=nRTknown, through kapillary transmission, act on the pressure on interlayer diaphragm
f 1for:
One end of pressure transmission bar and interlayer diaphragm are rigidly connected, and the other end and equi intensity cantilever free end are rigidly connected, act on the pressure on interlayer diaphragm
f 1through pressure transmission bar, transmitting, be applied to the free end of equi intensity cantilever, is that it produces an equivalent acting force
f 2
F 1 =F 2 (3)
When power of equi intensity cantilever free end effect
f 2time, its axial strain Δ
εwith power
f 2pass be:
（4）
Wherein,
e: the elastic modulus of equi intensity cantilever;
b 0 : the width of equi intensity cantilever stiff end;
h: the thickness of equi intensity cantilever;
l: be the length of equi intensity cantilever.
Due to
f 1 =F 2so formula (4) can be equivalent to:
（5）
Formula (2) substitution formula (5) can be obtained to equi intensity cantilever axial strain and temperature
tpass be:
Optical fiber Bragg raster is with equi intensity cantilever deformation, if in measuring process temperature variation Δ
t, the wavelength-shift amount Δ of the optical fiber Bragg raster that strain and temperature cause
λ b for
Wherein
s ε: strain sensitive coefficient;
s t: temperature-sensitivity coefficient; Δ
ε: axial strain variable quantity; Δ
t: temperature variation
Amount;
λ b : optical fiber Bragg raster centre wavelength.
The wavelength-shift that sticks on the optical fiber Bragg raster of two same models on the upper and lower centre of surface axis of equi intensity cantilever is subtracted each other, can eliminate the impact of environment temperature, while obtaining only having effects of strain, the displacement of optical fiber Bragg raster centre wavelength is:
（8）
Δ wherein
λ b1,2
: the wavelength-shift difference of two optical fiber Bragg rasters that paste on the upper and lower surface of equi intensity cantilever; Δ
λ b1
and Δ
λ b2
be respectively the wavelength-shift of two optical fiber Bragg rasters of pasting on the upper and lower surface of equi intensity cantilever.
Formula (8) substitution formula (4) can be obtained to equi intensity cantilever free end acting force
f 2with the pass of optical fiber Bragg raster centre wavelength displacement be:
（9）
Formula (8) substitution formula (6) can be obtained to dut temperature
twith optical fiber Bragg raster centre wavelength shifts delta
λ b1,2
pass be:
(10)
Formula (10) has shown test environment temperature
twith optical fiber Bragg raster wavelength-shift Δ
λ b1,2
between mathematical model, by measuring optical fiber Bragg grating wavelength displacement, just can calculate test environment temperature.
The invention has the beneficial effects as follows:
(1) can remote temperature measurement.Owing to adopting kapillary to connect temperature measuring unit and pneumatic converting unit, can require length capillaceous reasonable in design according to various, avoid optical fiber Bragg raster and tested extreme temperature close contact, thereby reduce the impact of tested extreme temperature on actual thermometric;
(2) can select dissimilar thermometer bulb according to different thermometric conditions, realize the adjustable of measurement range, sensitivity of thermometry;
(3) this temperature sensor itself is not with any electric signal, applicable to the temperature detection in the high-risk environment such as inflammable and explosive.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the partial schematic diagram that medium tenacity semi-girder 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 diaphragm, 7-kapillary adapter, 8-kapillary, 9-threaded connector, 10-temperature variation pressure sensitive bag, 11-screw, 12-fairlead, the external optical cable of 13-.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
Embodiment one: as shown in Figure 1, the structure of gas pressure type Fiber Bragg Grating Temperature sensor of the present invention: comprise gaseous tension temperature sensing device and optical fiber Bragg raster pressure conversion device, gaseous tension temperature sensing device connects kapillary 8 and interlayer diaphragm 6 by the temperature variation pressure sensitive bag 10 sealing; The main body of optical fiber Bragg raster pressure conversion device is the equi intensity cantilever 1 that optical fiber Bragg raster 2 is installed, and the pressure that gaseous tension temperature sensing device senses is transmitted by interlayer diaphragm 6 in one end of equi intensity cantilever 1; Optical fiber Bragg raster 2 is connected the signal that transmission senses with external optical cable 13.Between equi intensity cantilever 1 and interlayer diaphragm 6, by pressure transmission bar 4, be rigidly connected, interlayer diaphragm 6 is tightly connected by kapillary adapter 6 and kapillary 8.There is housing 3 optical fiber Bragg raster pressure conversion device outside, and optical fiber Bragg raster 2 is connected with external optical cable 13 by the fairlead 12 of housing 3 inside, with epoxy resin, fairlead 12 is sealed.Equi intensity cantilever 1 is fixed on housing 3 by support 5.Temperature variation pressure sensitive bag 10 is tightly connected by threaded connector 9 and kapillary 8.Optical fiber Bragg raster 2 sticks on the central axis of equi intensity cantilever 1 upper and lower surface.
The using method of gas pressure type Fiber Bragg Grating Temperature sensor of the present invention is:
(1) temperature variation pressure sensitive bag 10 is positioned under the temperature environment that needs to measure, the gas in thermometer bulb causes air pressure inside to change owing to expanding with heat and contract with cold, and the pressure F1 that obtains acting on interlayer diaphragm 6 according to the Ideal-Gas Equation PV=nRT is:
In formula, the pressure that P is working gas, S is the area that bears pressure, and V is Instrument package closed system volume, and R is universal gas constant (R=8.3114 m3*pa/mol*K), and T is working gas temperature, is approximately equal to measured medium
Temperature; N is the amount of substance of gas in thermometer bulb;
(2) one end due to pressure transmission bar 4 acts on the pressure on interlayer diaphragm 6
f 1be applied to equi intensity cantilever 1
On power
f 2be equivalent, obtain thus equi intensity cantilever axial strain Δ
εwith the pass of temperature T be:
Eliminate the impact of environment temperature, the wavelength-shift of the optical fiber Bragg raster of upper and lower surface is subtracted each other, obtain dut temperature
twith optical fiber Bragg raster centre wavelength shifts delta
λ b12
pass be:
In formula,
s εfor strain sensitive coefficient;
s tfor temperature-sensitivity coefficient; Δ
εfor axial strain variable quantity; Δ
tfor temperature variation;
λ b for optical fiber Bragg raster centre wavelength;
l: be the length of equi intensity cantilever
The design parameter the present invention relates to is: degree semi-girder dimensional parameters is:
l=50 mm,
h=0.3 mm,
b 0 =20 mm; Equi intensity cantilever material parameter is: Young ' the s modulus of 45# steel is
e=200 GPa; Thermometer bulb dimensional parameters: the right cylinder of Φ 14*150 mm; The technical parameter of optical fiber Bragg raster is: central wavelength lambda
b=1551 nm, strain sensitive coefficient S
ε=0.78*10
-6μ ε
-1, temperature-sensitivity coefficient S
t=6.0*10
-6℃
-1;
By the theory of above-mentioned formula, calculated and shown, the temperature control of this temperature sensor is 10.2pm/ ℃; When the wavelength resolution power of optical fiber Bragg raster (FBG) demodulator is 1pm, the temperature resolving power of this sensor is 0.098 ℃.
Embodiment two: as shown in Figure 1, the structure of gas pressure type Fiber Bragg Grating Temperature sensor of the present invention: comprise gaseous tension temperature sensing device and optical fiber Bragg raster pressure conversion device, gaseous tension temperature sensing device connects kapillary 8 and interlayer diaphragm 6 by the temperature variation pressure sensitive bag 10 sealing; The main body of optical fiber Bragg raster pressure conversion device is the equi intensity cantilever 1 that optical fiber Bragg raster 2 is installed, and the pressure that gaseous tension temperature sensing device senses is transmitted by interlayer diaphragm 6 in one end of equi intensity cantilever 1; Optical fiber Bragg raster 2 is connected the signal that transmission senses with external optical cable 13.Between equi intensity cantilever 1 and interlayer diaphragm 6, by pressure transmission bar 4, be rigidly connected, interlayer diaphragm 6 is tightly connected by kapillary adapter 6 and kapillary 8.There is housing 3 optical fiber Bragg raster pressure conversion device outside, and optical fiber Bragg raster 2 is connected with external optical cable 13 by the fairlead 12 of housing 3 inside, with epoxy resin, fairlead 12 is sealed.Equi intensity cantilever 1 is fixed on housing 3 by support 5.Optical fiber Bragg raster 2 sticks on the central axis of equi intensity cantilever 1 upper and lower surface.
The using method of gas pressure type Fiber Bragg Grating Temperature sensor of the present invention is:
(1) temperature variation pressure sensitive bag 10 is positioned under the temperature environment that needs to measure, the gas in thermometer bulb causes air pressure inside to change owing to expanding with heat and contract with cold, and the pressure F1 that obtains acting on interlayer diaphragm 6 according to the Ideal-Gas Equation PV=nRT is:
In formula, the pressure that P is working gas, S is the area that bears pressure, and V is Instrument package closed system volume, and R is universal gas constant (R=8.3114 m3*pa/mol*K), and T is working gas temperature, is approximately equal to measured medium
Temperature; N is the amount of substance of gas in thermometer bulb;
(2) one end due to pressure transmission bar 4 acts on the pressure on interlayer diaphragm 6
f 1be applied to equi intensity cantilever 1
On power
f 2be equivalent, obtain thus equi intensity cantilever axial strain Δ
εwith the pass of temperature T be:
Eliminate the impact of environment temperature, the wavelength-shift of the optical fiber Bragg raster of upper and lower surface is subtracted each other, obtain dut temperature
twith optical fiber Bragg raster centre wavelength shifts delta
λ b12
pass be:
In formula,
s εfor strain sensitive coefficient;
s tfor temperature-sensitivity coefficient; Δ
εfor axial strain variable quantity; Δ
tfor temperature variation;
λ b for optical fiber Bragg raster centre wavelength;
l: be the length of equi intensity cantilever
Below by reference to the accompanying drawings the specific embodiment of the present invention is explained in detail, but the present invention is not limited to above-mentioned embodiment, in the ken possessing those of ordinary skills, can also under the prerequisite that does not depart from aim of the present invention, make various variations.
Claims (5)
1. a gas pressure type Fiber Bragg Grating Temperature sensor, it is characterized in that: comprise gaseous tension temperature sensing device and optical fiber Bragg raster pressure conversion device, gaseous tension temperature sensing device connects kapillary (8) and interlayer diaphragm (6) by the temperature variation pressure sensitive bag (10) sealing; The main body of optical fiber Bragg raster pressure conversion device is the equi intensity cantilever (1) that optical fiber Bragg raster (2) are installed, and the pressure that gaseous tension temperature sensing device senses is transmitted by interlayer diaphragm (6) in one end of equi intensity cantilever (1); Optical fiber Bragg raster (2) is connected the signal that transmission senses with external optical cable (13).
2. gas pressure type Fiber Bragg Grating Temperature sensor according to claim 1, it is characterized in that: between described equi intensity cantilever (1) and interlayer diaphragm (6), by pressure transmission bar (4), be rigidly connected, interlayer diaphragm (6) is tightly connected by kapillary adapter (6) and kapillary (8).
3. gas pressure type Fiber Bragg Grating Temperature sensor according to claim 1, it is characterized in that: there is housing (3) described optical fiber Bragg raster pressure conversion device outside, optical fiber Bragg raster (2) is connected with external optical cable (13) by the inner fairlead (12) of housing (3), with epoxy resin, fairlead (12) is sealed.
4. gas pressure type Fiber Bragg Grating Temperature sensor according to claim 1, is characterized in that: described optical fiber Bragg raster (2) sticks on the central axis of equi intensity cantilever (1) upper and lower surface.
5. a using method for gas pressure type Fiber Bragg Grating Temperature sensor, is characterized in that:
(1) temperature variation pressure sensitive bag (10) is positioned under the temperature environment that needs to measure, gas in thermometer bulb causes air pressure inside to change owing to expanding with heat and contract with cold, and the pressure F1 that obtains acting on interlayer diaphragm (6) according to the Ideal-Gas Equation PV=nRT is:
In formula, the pressure that P is working gas, S is the area that bears pressure, and V is Instrument package closed system volume, and R is
Universal gas constant, T is working gas temperature, is approximately equal to the temperature of measured medium; N is the amount of substance of gas in thermometer bulb;
(2) one end due to pressure transmission bar (4) acts on the pressure on interlayer diaphragm (6)
f 1be applied to equal strength arm
Power on beam 1
f 2be equivalent, obtain thus equi intensity cantilever axial strain Δ
εwith the pass of temperature T be:
Eliminate the impact of environment temperature, the wavelength-shift of the optical fiber Bragg raster of upper and lower surface is subtracted each other, obtain dut temperature
twith optical fiber Bragg raster centre wavelength shifts delta
λ b12
pass be:
In formula,
s εfor strain sensitive coefficient;
s tfor temperature-sensitivity coefficient; Δ
εfor axial strain variable quantity; Δ
tfor temperature variation;
λ b for optical fiber Bragg raster centre wavelength;
l: be the length of equi intensity cantilever.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110530548A (en) * | 2019-08-02 | 2019-12-03 | 西安交通大学 | A kind of fiber grating detection method and device that measurement pressure and temperature is two-parameter |
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|---|---|---|---|---|
| CN87213747U (en) * | 1987-09-24 | 1988-06-15 | 富阳仪表厂 | Flat spring tube pressure type thermometer |
| WO2000033034A1 (en) * | 1998-12-04 | 2000-06-08 | Cidra Corporation | Pressure-isolated bragg grating temperature sensor |
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| 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 |
-
2013
- 2013-12-11 CN CN201310666709.0A patent/CN103674319B/en not_active Expired - Fee Related
Patent Citations (7)
| 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 |
| WO2000033034A1 (en) * | 1998-12-04 | 2000-06-08 | 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 |
| 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110530548A (en) * | 2019-08-02 | 2019-12-03 | 西安交通大学 | A kind of fiber grating detection method and device that measurement pressure and temperature is two-parameter |
| 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 |
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| CN103674319B (en) | 2016-08-17 |
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