CN101776473A - Differential strain type optical fiber Bragg raster-suspended belt scale - Google Patents
Differential strain type optical fiber Bragg raster-suspended belt scale Download PDFInfo
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- CN101776473A CN101776473A CN201010102151A CN201010102151A CN101776473A CN 101776473 A CN101776473 A CN 101776473A CN 201010102151 A CN201010102151 A CN 201010102151A CN 201010102151 A CN201010102151 A CN 201010102151A CN 101776473 A CN101776473 A CN 101776473A
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- optical fiber
- fiber bragg
- bragg raster
- equi intensity
- intensity cantilever
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 46
- 238000005303 weighing Methods 0.000 claims abstract description 13
- 230000003068 static effect Effects 0.000 claims abstract description 8
- 238000005259 measurement Methods 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 14
- 238000006073 displacement reaction Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000013590 bulk material Substances 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012777 electrically insulating material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000013341 scale-up Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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Abstract
The invention relates to a differential strain type optical fiber Bragg raster-suspended belt scale belonging to the technical field of photoelectronic measurement. A dynamic beam of the device and a fixed base of a weighing roller are connected into a whole, the stressed end of a constant-strength cantilever beam is fixedly connected with the dynamic beam, the fixed end of the constant-strength cantilever beam is fixed on a static beam, an optical fiber Bragg raster is respectively pasted along the upper and lower surfaces of the constant-strength cantilever beam, and the optical fiber Bragg raster is connected with a signal processing device by using a signal wire. The belt scale realizes real-time and precise weighing, can simultaneously measure temperature and pressure and has strong anti-electromagnetic interference capacity.
Description
Technical field
The present invention relates to a kind of differential strain type optical fiber Bragg raster-suspended belt scale, belong to the photoelectron field of measuring technique.
Background technology
Belt conveyer scale is a kind of metering outfit of in the band conveyor conveying solid substance bulk material process material being carried out consecutive weighings, and suspended belt scale has been widely used in the material metering of industries such as electric power, coal, metallurgy, mine, harbour, chemical industry, building materials.Because the inverting element of suspended belt scale adopts resistance strain gage mostly, measuring accuracy is subjected to the influence (Fang Yuanbai, " belted electronic balance ", Beijing: metallurgical industry publishing house, 2007) of electromagnetic interference (EMI).
The information that optical fiber Bragg raster monitors is by lightray propagation, has anti-electromagnetic interference capability (EMI) and at the intrinsic safety of inflammable and explosive occasion, therefore adopt the inverting element of optical fiber Bragg raster as LOAD CELLS in the suspended belt scale, can overcome electromagnetic interference (EMI), be applicable to industrial environments such as inflammable and explosive.But, in the belt conveyer scale device of the actual use in market, perhaps in patent documentation, also do not find the relevant art that optical fiber Bragg raster is combined with belt conveyer scale up to now.
Summary of the invention
The purpose of this invention is to provide a kind of differential strain type optical fiber Bragg raster-suspended belt scale, realized accurately weighing in real time of belt conveyer scale, measure in the time of can be to temperature and pressure, anti-electromagnetic interference capability is strong.
Realize that the technical scheme that above-mentioned purpose of the present invention is taked is: dynamically the firm banking of beam and weighing carrier roller fuses, the force side of equi intensity cantilever is fixedly linked with dynamic beam, the stiff end of equi intensity cantilever is fixed on the static beam, respectively paste an optical fiber Bragg raster along the upper and lower surface of equi intensity cantilever, optical fiber Bragg raster is connected with signal processing apparatus with signal wire.
The optical fiber Bragg raster that paste on the upper and lower surface of described equi intensity cantilever is positioned at position of center line, and the equi intensity cantilever two ends are adopted screw to connect to come respectively and fixed with static beam and dynamic beam.
Material passes to dynamic beam to the pressure of belt by weighing carrier roller during convey materials, and dynamically beam passes to equi intensity cantilever with power again, and equi intensity cantilever produces amount of deflection (deformation quantity) to be changed, thereby causes that the optical fiber Bragg raster wavelength shift changes.
The present invention pastes optical fiber Bragg raster at the equi intensity cantilever upper and lower faces, temperature variation causes that the change in displacement of two optical fiber Bragg rasters is identical, and stress causes that the change in displacement of two optical fiber Bragg rasters is that big or small equidirectional is opposite, thereby adopts the differential temperature compensation method to solve strain, temperature cross sensitivity problem that optical fiber Bragg raster causes owing to the temperature variation in the short time when strain measurement.
The principle that the differential strain type optical fiber Bragg raster-suspended belt scale is measured quality of material is: material passes to dynamic beam to the pressure of belt by weighing carrier roller during mass transport, dynamically beam passes to equi intensity cantilever with pressure again, according to the power transmission as can be known, during mass transport quality of material M and equi intensity cantilever free end the pass of stressed F be:
F＝Mg (1)
Wherein g is an acceleration of gravity.
Belt conveyer scale load causes equi intensity cantilever 5 free ends displacements, and optical fiber Bragg raster 4 is with equi intensity cantilever 5 deformation, if in the measuring process temperature variation Δ T, the wavelength-shift amount Δ λ of the optical fiber Bragg raster 4 that causes of load and temperature then
BFor:
Δλ
B＝(S
εΔε+S
TΔT)λ
B (2)
S wherein
εBe the strain sensitive coefficient; S
TBe temperature-sensitivity coefficient; Δ ε is the displacement of equi intensity cantilever free end; Δ T is a temperature variation; λ
BBe centre wavelength.
The wavelength-shift of upper and lower surperficial two optical fiber Bragg rasters of pasting of equi intensity cantilever is subtracted each other, eliminates the influence of environment temperature:
Δλ
B1，2＝Δλ
B1-Δλ
B2＝2S
εΔελ
B (3)
Δ λ wherein
B1,2Wavelength-shift difference for upper and lower surperficial two optical fiber Bragg rasters of pasting of equi intensity cantilever; Δ λ
B1With Δ λ
B2Be respectively the wavelength-shift of two optical fiber Bragg rasters of pasting on the upper and lower surface of equi intensity cantilever.
The pass of equi intensity cantilever free end shifts delta ε and the suffered stress F of equi intensity cantilever free end is:
Wherein L, h are respectively the length and the thickness of equi intensity cantilever; E is the Young modulus of equi intensity cantilever material; b
0Width for the equi intensity cantilever stiff end.
With formula (4) substitution formula (3), then the pass of the Bragg wavelength-shift of optical fiber Bragg raster and the suffered stress F of equi intensity cantilever free end is:
With formula (1) substitution formula (5), then the pass of quality of material M is when the Bragg wavelength-shift of optical fiber Bragg raster and mass transport:
Mathematical model when formula (6) has shown mass transport between quality of material M and the optical fiber Bragg raster wavelength-shift, the quality of material in the time of just can calculating mass transport by the displacement of measuring optical fiber Bragg grating wavelength.
The invention has the beneficial effects as follows:
1. realized weighing in real time of belt conveyer scale: the present invention is separately fixed at the stiff end and the free end of equi intensity cantilever on static beam and the dynamic beam, optical fiber Bragg raster sticks on the equi intensity cantilever, realizes weighing in real time of belt conveyer scale by the measurement that the amount of deflection of equi intensity cantilever is converted to the displacement of the centre wavelength of optical fiber Bragg raster.
2. utilization is pasted on the otherness of the sensing grating on the upper and lower surface of equi intensity cantilever to the temperature and pressure response, measures when can realize temperature and pressure.
3. antijamming capability is strong: because optical fiber Bragg raster is an electrically insulating material, therefore have anti-electromagnetic interference capability (EMI), optical fiber Bragg grating sensor is applicable to the belt balance weighing under the electromagnetic interference (EMI) situation.
Description of drawings
Fig. 1 is the structural representation of dismounting belt of the present invention.
Fig. 2 looks synoptic diagram for plan structure of the present invention.
Each label is represented successively among the figure: static beam 1, weighing carrier roller 2, screw 3, optical fiber Bragg raster 4, equi intensity cantilever 5, dynamic beam 6, parallel leaf spring 7, band conveyor longeron 8, signal processing apparatus 9.
Embodiment
Present embodiment is based on the BEP type belt conveyer scale of German Carl Schenck AG, and the equi intensity cantilever that adopts stainless steel material to make.Dynamically beam 6 fuses with the firm banking of weighing carrier roller 2, the force side of equi intensity cantilever 5 is with dynamically beam 6 usefulness screws 3 are fixing, the stiff end of equi intensity cantilever 5 is fixed on the static beam 1 with screw 3, upper and lower centre of surface line position along equi intensity cantilever is respectively pasted an optical fiber Bragg raster 4, and optical fiber Bragg raster 4 usefulness signal wires are connected with signal processing apparatus 9.
1, equi intensity cantilever, dimensional parameters is: L=250mm, h=5mm, b
0=200mm;
2, equi intensity cantilever, material parameter is: Young ' the s modulus of 45# steel is E=200GPa;
3, the technical parameter of optical fiber Bragg raster is: central wavelength lambda
B=1550.000nm, the strain sensitive coefficient S
ε=0.78;
4, acceleration of gravity is: g=9.8N/Kg;
5, press accompanying drawing 2 configuration experiments;
6, obtain the Bragg wavelength of optical fiber Bragg raster with the fiber grating analyser;
7, according to formula (6), the response sensitivity of the Bragg wavelength-shift of optical fiber Bragg raster quality of material M during to mass transport is:
With known quantity substitution formula (7), Theoretical Calculation shows that the sensitivity of the optical fiber Bragg raster LOAD CELLS in this belt conveyer scale is 35.54pm/Kg.Therefore, when the wavelength resolution of optical fiber Bragg raster (FBG) demodulator was 1pm, the resolution of this sensor was 0.028Kg.Comparative analysis is the result show, this kind differential strain type optical fiber Bragg raster-suspended belt weighing-appliance has high measurement resolution, and measuring error is little, advantages such as good reproducibility.
Claims (2)
1. differential strain type optical fiber Bragg raster-suspended belt scale, it is characterized in that: dynamically the firm banking of beam and weighing carrier roller fuses, the force side of equi intensity cantilever is fixedly linked with dynamic beam, the stiff end of equi intensity cantilever is fixed on the static beam, respectively paste an optical fiber Bragg raster along the upper and lower surface of equi intensity cantilever, optical fiber Bragg raster is connected with signal processing apparatus with signal wire.
2. by the described differential strain type optical fiber Bragg raster-suspended belt scale of claim 1, it is characterized in that: the optical fiber Bragg raster that paste on the upper and lower surface of equi intensity cantilever is positioned at position of center line, and the equi intensity cantilever two ends are adopted screw to connect to come respectively and fixed with static beam and dynamic beam.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010102151A CN101776473A (en) | 2010-01-28 | 2010-01-28 | Differential strain type optical fiber Bragg raster-suspended belt scale |
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|---|---|---|---|
| CN201010102151A CN101776473A (en) | 2010-01-28 | 2010-01-28 | Differential strain type optical fiber Bragg raster-suspended belt scale |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102072787A (en) * | 2010-10-29 | 2011-05-25 | 中国科学院上海光学精密机械研究所 | Temperature self-compensated fiber grating tension sensor |
| CN103644955A (en) * | 2013-12-03 | 2014-03-19 | 大连大学 | Differential-motion strain fiber Bragg grating suspension-type belt weigher |
| CN103728070A (en) * | 2014-01-10 | 2014-04-16 | 中国船舶重工集团公司第七0四研究所 | Torque testing system capable of automatically compensating temperature and bending moment influence |
| CN103822738A (en) * | 2014-01-03 | 2014-05-28 | 重庆大学 | Stress sensor based on fiber gratings |
| CN108759997A (en) * | 2018-07-18 | 2018-11-06 | 武汉理工大学 | It is a kind of to be used for the optical fiber sensing system and its monitoring method that petrochemical industry feed belt is weighed |
| CN108918003A (en) * | 2018-05-25 | 2018-11-30 | 河南科技大学 | A kind of differential type pressure-detecting device |
| CN110514329A (en) * | 2019-08-08 | 2019-11-29 | 西安中星测控有限公司 | A kind of passive two-dimensional code load transducer and preparation method thereof |
| CN110987137A (en) * | 2019-12-13 | 2020-04-10 | 武汉理工大学 | Mining vehicle weighing system and method based on fiber bragg grating sensor |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2127158A (en) * | 1982-09-14 | 1984-04-04 | Rospen Ind Limited | Batch weighing apparatus |
| RU2289797C1 (en) * | 2005-06-24 | 2006-12-20 | Закрытое акционерное общество "Энерпром-Электроникс" | Conveyor balance |
| CN2938032Y (en) * | 2006-06-26 | 2007-08-22 | 哈尔滨工业大学 | Fibre-optical raster osmometer |
| CN200972403Y (en) * | 2006-08-22 | 2007-11-07 | 江苏赛摩集团有限公司 | Electronci belt conveyer scale |
| CN201607269U (en) * | 2010-01-28 | 2010-10-13 | 昆明理工大学 | Differential-motion strain type optical-fiber Bragg grating suspending belt weigher |
-
2010
- 2010-01-28 CN CN201010102151A patent/CN101776473A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2127158A (en) * | 1982-09-14 | 1984-04-04 | Rospen Ind Limited | Batch weighing apparatus |
| RU2289797C1 (en) * | 2005-06-24 | 2006-12-20 | Закрытое акционерное общество "Энерпром-Электроникс" | Conveyor balance |
| CN2938032Y (en) * | 2006-06-26 | 2007-08-22 | 哈尔滨工业大学 | Fibre-optical raster osmometer |
| CN200972403Y (en) * | 2006-08-22 | 2007-11-07 | 江苏赛摩集团有限公司 | Electronci belt conveyer scale |
| CN201607269U (en) * | 2010-01-28 | 2010-10-13 | 昆明理工大学 | Differential-motion strain type optical-fiber Bragg grating suspending belt weigher |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102072787A (en) * | 2010-10-29 | 2011-05-25 | 中国科学院上海光学精密机械研究所 | Temperature self-compensated fiber grating tension sensor |
| CN103644955A (en) * | 2013-12-03 | 2014-03-19 | 大连大学 | Differential-motion strain fiber Bragg grating suspension-type belt weigher |
| CN103822738A (en) * | 2014-01-03 | 2014-05-28 | 重庆大学 | Stress sensor based on fiber gratings |
| CN103728070A (en) * | 2014-01-10 | 2014-04-16 | 中国船舶重工集团公司第七0四研究所 | Torque testing system capable of automatically compensating temperature and bending moment influence |
| CN108918003A (en) * | 2018-05-25 | 2018-11-30 | 河南科技大学 | A kind of differential type pressure-detecting device |
| CN108759997A (en) * | 2018-07-18 | 2018-11-06 | 武汉理工大学 | It is a kind of to be used for the optical fiber sensing system and its monitoring method that petrochemical industry feed belt is weighed |
| CN110514329A (en) * | 2019-08-08 | 2019-11-29 | 西安中星测控有限公司 | A kind of passive two-dimensional code load transducer and preparation method thereof |
| CN110987137A (en) * | 2019-12-13 | 2020-04-10 | 武汉理工大学 | Mining vehicle weighing system and method based on fiber bragg grating sensor |
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Application publication date: 20100714 |