CN201844872U - Differential strain type suspension type belt scale with optical fiber Bragg grating - Google Patents
Differential strain type suspension type belt scale with optical fiber Bragg grating Download PDFInfo
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- CN201844872U CN201844872U CN2010205957736U CN201020595773U CN201844872U CN 201844872 U CN201844872 U CN 201844872U CN 2010205957736 U CN2010205957736 U CN 2010205957736U CN 201020595773 U CN201020595773 U CN 201020595773U CN 201844872 U CN201844872 U CN 201844872U
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- optical fiber
- fiber bragg
- equi intensity
- intensity cantilever
- bragg raster
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 41
- 239000000725 suspension Substances 0.000 title abstract 2
- 238000005303 weighing Methods 0.000 claims abstract description 14
- 238000005259 measurement Methods 0.000 claims abstract description 8
- 230000003068 static effect Effects 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 description 14
- 238000006073 displacement reaction Methods 0.000 description 6
- 230000001133 acceleration Effects 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000006467 substitution reaction Methods 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
- 238000001514 detection method 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
- 239000000835 fiber Substances 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 238000005272 metallurgy 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 utility model relates to a differential strain type suspension type belt scale with an optical fiber Bragg grating, which comprises a static beam, a weighing support roller, fixing screws, optical fiber Bragg gratings, a constant-strength cantilever beam and a dynamic beam, wherein the dynamic beam and a fixed seat of the weighing support roller are connected into one body, the stress end of the constant-strength cantilever beam is connected with the dynamic beam and is fastened through the fixing screw, the fixed end of the constant-strength cantilever beam is fixed on the static beam through the fixing screw, the upper surface and the lower surface of the constant-strength cantilever beam are respectively pasted with the optical fiber Bragg gratings, the pasting positions are symmetrical center lines of the constant-strength cantilever beam, and a differential temperature compensating method is adopted for eliminating the influence of the temperature on measuring results, so the precise measurement on the weight is realized. The real-time weighing of the belt scale can be realized, the simultaneous measurement on the temperature and the pressure can be realized, and the anti-jamming capability is strong.
Description
Technical field
The present invention relates to a kind of suspended belt scale of differential strain type optical fiber Bragg raster, 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.
Summary of the invention
The suspended belt scale that the purpose of this invention is to provide a kind of differential strain type optical fiber Bragg raster has been realized weighing in real time of belt conveyer scale, measures when can realize temperature and pressure, and antijamming capability is strong.
The object of the present invention is achieved like this: the suspended belt scale of differential strain type optical fiber Bragg raster comprises static beam, weighing carrier roller, fixed screw, optical fiber Bragg raster, equi intensity cantilever, dynamic beam, dynamically the holder of beam and weighing carrier roller fuses, the force side of equi intensity cantilever links to each other with dynamic beam, and it is fastening with fixed screw, the stiff end of equi intensity cantilever is fixed on the static beam with fixed screw, on equi intensity cantilever, lower surface posts optical fiber Bragg raster respectively, paste position is on the equi intensity cantilever symmetrical center line, and adopt the differential temperature penalty method to eliminate the influence of temperature, thereby realize accurate measurement to weight to measurement result.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, according to otherness, carries out information compensation.
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, 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 principle that the suspended belt scale of differential strain type optical fiber Bragg raster of the present invention is measured quality of material is: material passes to dynamic beam 6 to the pressure of belt by weighing carrier roller during mass transport, dynamically beam 6 passes to pressure equi intensity cantilever 5 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 free end displacement, and optical fiber Bragg raster is with equi intensity cantilever deformation, if in the measuring process temperature variation Δ T, the wavelength-shift amount Δ λ of the optical fiber Bragg raster 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 5 on static beam 1 and the dynamic beam 6, optical fiber Bragg raster 4 sticks on the equi intensity cantilever 5, 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.
The invention will be further described below in conjunction with drawings and Examples, but embodiment is not a limitation of the invention.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is a detection system synoptic diagram of the present invention.
Embodiment
Among Fig. 1 and Fig. 2: static beam 1, weighing carrier roller 2, fixed screw 3, optical fiber Bragg raster 4, equi intensity cantilever 5, dynamic beam 6, parallel leaf spring 7, band conveyor longeron 8.
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.
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 (8), the response sensitivity of the Bragg wavelength-shift of optical fiber Bragg raster quality of material M during to mass transport is:
Bring known quantity into formula (9), 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, the suspended belt scale of this kind differential strain type optical fiber Bragg raster 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 beam (6) fuses with the holder of weighing carrier roller (2), the force side of equi intensity cantilever (5) links to each other with dynamic beam (6), and it is fastening with fixed screw (3), the stiff end of equi intensity cantilever (5) is fixed on the static beam (1), center line along the upper and lower surface of equi intensity cantilever (5) is respectively pasted an optical fiber Bragg raster (4), and optical fiber Bragg raster (4) is connected with signal processing apparatus light.
2. the suspended belt scale of the described differential strain type optical fiber Bragg raster of root a tree name claim 1, it is characterized in that: all paste optical fiber Bragg raster at equi intensity cantilever (5) upper and lower faces, paste position is on equi intensity cantilever (5) symmetrical center line, and adopt the differential temperature penalty method to eliminate the influence of temperature, thereby realize accurate measurement to weight to measurement result.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205957736U CN201844872U (en) | 2010-11-08 | 2010-11-08 | Differential strain type suspension type belt scale with optical fiber Bragg grating |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205957736U CN201844872U (en) | 2010-11-08 | 2010-11-08 | Differential strain type suspension type belt scale with optical fiber Bragg grating |
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| Publication Number | Publication Date |
|---|---|
| CN201844872U true CN201844872U (en) | 2011-05-25 |
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| CN2010205957736U Expired - Fee Related CN201844872U (en) | 2010-11-08 | 2010-11-08 | Differential strain type suspension type belt scale with optical fiber Bragg grating |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103267547A (en) * | 2013-04-27 | 2013-08-28 | 昆明理工大学 | Micro flow sensor based on fiber Bragg grating |
| CN103644955A (en) * | 2013-12-03 | 2014-03-19 | 大连大学 | Differential-motion strain fiber Bragg grating suspension-type belt weigher |
| CN111521248A (en) * | 2020-05-09 | 2020-08-11 | 珠海任驰光电科技有限公司 | Fiber grating vehicle dynamic weighing sensor, device and method |
-
2010
- 2010-11-08 CN CN2010205957736U patent/CN201844872U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103267547A (en) * | 2013-04-27 | 2013-08-28 | 昆明理工大学 | Micro flow sensor based on fiber Bragg grating |
| CN103267547B (en) * | 2013-04-27 | 2015-11-18 | 昆明理工大学 | A kind of microflow sensor based on optical fiber Bragg raster counting |
| CN103644955A (en) * | 2013-12-03 | 2014-03-19 | 大连大学 | Differential-motion strain fiber Bragg grating suspension-type belt weigher |
| CN111521248A (en) * | 2020-05-09 | 2020-08-11 | 珠海任驰光电科技有限公司 | Fiber grating vehicle dynamic weighing sensor, device and method |
| CN111521248B (en) * | 2020-05-09 | 2021-07-06 | 珠海任驰光电科技有限公司 | Fiber grating vehicle dynamic weighing sensor, device and method |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110525 Termination date: 20131108 |