CN109520903A - A kind of double light path laser forward scattering measuring concentration of granules in certain device - Google Patents
A kind of double light path laser forward scattering measuring concentration of granules in certain device Download PDFInfo
- Publication number
- CN109520903A CN109520903A CN201811562577.6A CN201811562577A CN109520903A CN 109520903 A CN109520903 A CN 109520903A CN 201811562577 A CN201811562577 A CN 201811562577A CN 109520903 A CN109520903 A CN 109520903A
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- optical fiber
- laser
- sleeve
- lens barrel
- light path
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- 239000008187 granular material Substances 0.000 title claims abstract description 11
- 239000013307 optical fiber Substances 0.000 claims abstract description 44
- 230000003287 optical effect Effects 0.000 claims abstract description 34
- 238000005259 measurement Methods 0.000 claims abstract description 30
- 239000011148 porous material Substances 0.000 claims abstract description 18
- 238000013532 laser treatment Methods 0.000 claims abstract description 15
- 238000010926 purge Methods 0.000 claims description 12
- 238000013500 data storage Methods 0.000 claims description 4
- 239000002245 particle Substances 0.000 abstract description 3
- 239000013618 particulate matter Substances 0.000 description 17
- 239000000428 dust Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 239000000809 air pollutant Substances 0.000 description 2
- 231100001243 air pollutant Toxicity 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical class [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000000149 argon plasma sintering Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000000796 flavoring agent Substances 0.000 description 1
- 235000019634 flavors Nutrition 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 206010022000 influenza Diseases 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
-
- G01N15/075—
Abstract
The present invention provides a kind of double light path laser forward scattering measuring concentration of granules in certain device, including electric unit box, measurement feeler lever and reception box, the electric unit box are equipped with laser emitter and laser treatment device；The measurement feeler lever includes sleeve and optical path protection pipe, the inside of the rear end of the sleeve is equipped with optical splitter, the optical splitter includes spectroscope and two lens barrels, the front end of the lens barrel is equipped with protection eyeglass, the front end of the sleeve is equipped with fixed lid, the middle part of the sleeve is equipped with retainer plate, the fixed lid and the retainer plate are equipped with protection pore and optical fiber pore, optical fiber tube is equipped in the optical fiber pore, laser pickoff is equipped in the reception box, the laser pickoff is equipped with receiver board, optical fiber is connected between the laser pickoff and the laser treatment device, the present invention measures particle concentration using double light path forward scattering, there is calibration light path calibration, measurement result is more accurate.
Description
Technical field
The present invention relates to a kind of double light path laser forward scattering measuring concentration of granules in certain devices.
Background technique
On September 12nd, 2014, National Development and Reform Committee, State Ministry of Environmental Protection, National Energy Board dispatch a joint document, and " about printing and distributing, " coal is electric
Energy-saving and emission-reduction upgrading with transformation action plan (2014-the year two thousand twenty) " notice " in require, move forward steadily 300,000 kilowatts of active service and
The above public Thermal generation unit and conditional 300,000 kilowatts following public Thermal generation unit implementation Air Pollutant Emissions
Concentration basically reaches the environmental transformation of gas turbine group emission limit.Thermal generation unit Air Pollutant Emission concentration reaches substantially
It is flue dust, sulfur dioxide, discharged nitrous oxides concentration point under the conditions of benchmark oxygen content 6% to gas turbine group emission limit
It Bu Gaoyu not 10,35,50mg/m3.
Now common particle concentration on-line monitoring equipment is mostly scattering principle after the laser of monochromatic light road in the market, and principle is
Beam of laser is injected into flue, the particulate matter in light beam and flue gas generates scattering, and the power for scattering light is directly proportional with scattering section,
When particulate matter increases, the scattering optical cross-section of particulate matter increases, and scattering light enhancing is further measured by the power of scattering light
The concentration of particulate matter.
Back scattering particulate matter on-line monitoring equipment is in the case where existing ring requires to protect i.e. minimum discharge operating condition with there are all
More defects:
1. under minimum discharge operating condition, the discharge limit of dust is 5mg/m3, instrument is scattered after the laser of existing monochromatic light road
Required precision is much not achieved in measurement accuracy, is unable to measure the dust of low concentration；
2. scatter instrument after the laser of existing monochromatic light road, when being measured under minimum discharge operating condition by the flues such as aqueous vapor environment because
The influence of element causes measurement inaccuracy；
3. scattering instrument after the laser of existing monochromatic light road uses original flavor mounting means, measure is not pre-processed, in ultralow row
It is easy under the high humidity low temperature environment put by flue gas corrosion, maintenance is big, need to often clean camera lens.
Summary of the invention
In order to overcome drawbacks described above, the present invention provides a kind of double light path laser forward scattering measuring concentration of granules in certain device,
Particle concentration is measured using double light path forward scattering, has calibration light path calibration, measurement result is more accurate.
The present invention provides the following technical solutions:
A kind of double light path laser forward scattering measuring concentration of granules in certain device, including electric unit box, measurement feeler lever and
Box is received, the electric unit box is equipped with laser emitter and laser treatment device；The front side of the electric unit box is equipped with through-hole；
The measurement feeler lever includes sleeve and the optical path protection pipe set on the sleeve inner, and the rear end of the sleeve is fixed
Ground is sheathed on the inside edge of the through-hole, and the inside of the rear end of the sleeve is equipped with optical splitter, and the optical splitter includes spectroscope
The lens barrel of the spectroscope front end is set to two, the emission port of the laser emitter is corresponding with the spectroscope position, institute
The front end for stating lens barrel is equipped with protection eyeglass, and the lens barrel includes measurement lens barrel and calibration lens barrel, and the front end of the sleeve is equipped with solid
Fixed lid, the middle part of the sleeve are equipped with retainer plate, and the fixed lid and retainer plate are equipped with protection pore and optical fiber pore, described
Optical path protection pipe is fixed in the protection pore, and the position of the optical path protection pipe is corresponding with the calibration lens barrel position, institute
It states and is equipped with optical fiber tube in optical fiber pore, the rear end of the optical fiber tube is stretched in the electric unit box, before the optical fiber tube
End is stretched at the cartridge exterior and connects the reception box；
Laser pickoff is equipped in the reception box, the laser pickoff is equipped with receiver board, the position of the receiver board
Corresponding with optical path protection pipe position, the position of the measurement lens barrel connects tabula rasa position, the laser pickoff higher than described
Optical fiber is connected between the laser treatment device, the optical fiber is set in the optical fiber tube；
The fixed lid is additionally provided with loophole, and the loophole is corresponding with two lens barrel positions, the reception box
Rear end connects unthreaded hole equipped with corresponding with the loophole.
Preferably, the sleeve is equipped with purging interface corresponding with the protection lens position, the purging interface connection
There is blower, the optical fiber tube body is equipped with air port corresponding with the purging interface position.
Preferably, the laser treatment device is equipped with digital analog converter and data storage.
Preferably, the inside edge of the through-hole is equipped with the first screw thread, and the outside of the rear end of the sleeve is equipped with and described the
Matched second screw thread of one screw thread.
Preferably, the spectroscope is prism, the measurement lens barrel and the calibration lens barrel with the prism position
Set correspondence.
The beneficial effects of the present invention are: lens barrel can collapse deflecting light beams, so that generating relatively clearly between two light beams
Boundary, improves the intensity and quality of light beam, and protection eyeglass can prevent extraneous particulate matter from entering inside lens barrel；Protect pore and
Optical fiber pore is respectively used to fixed optical path protection pipe and optical fiber tube, and optical path protection pipe collapses calibration beam for second protection, makes
The direction and intensity for obtaining calibration beam are more in line with alignment requirements；The presence of optical fiber tube, which is connected to, receives box and measurement feeler lever, real
Now being fixedly connected between the two；The position of receiver board is corresponding with optical path protection pipe position, so that calibration beam can be existed with direct projection
On receiver board, the position for measuring lens barrel, which is higher than, connects tabula rasa position, so that measuring beam is only scattered being irradiated to particulate matter
When, the forward scattering light of generation can just be received plate reception, be connected in the rear end of sleeve and electric unit box, facilitate Laser emission
Device reflects measuring beam and calibration beam by Laser emission to spectroscope, and by spectroscope, and calibration beam direct projection is to receiving
On plate, the forward scattering light that measuring beam only passes through particulate matter can be just mapped on receiver board, have receiver board to receive calibration beam
With the forward scattering light of measuring beam, and optical signal is sent to laser treatment device by optical fiber, completes the transmission of signal.
Detailed description of the invention
Attached drawing is used to provide further understanding of the present invention, and constitutes part of specification, with reality of the invention
It applies example to be used to explain the present invention together, not be construed as limiting the invention.In the accompanying drawings:
Fig. 1 is schematic structural view of the invention；
Fig. 2 is measuring beam and calibration beam schematic diagram of the present invention；
In the figure, it is marked as 1, electric unit box；11, laser emitter；12, laser treatment device；2, sleeve；21, optical splitter；
22, optical path protection pipe；23, retainer plate；24, fixed lid；25, measuring beam；26, calibration beam；3, box is received；31, laser connects
Receive device；4, optical fiber tube；41, optical fiber；5, particulate matter.
Specific embodiment
As depicted in figs. 1 and 2, the present invention and the present embodiment with from measurement feeler lever to receive box 3 direction be before, with
After the direction of measurement feeler lever direction to electric unit box 1 is, the present invention includes electric unit box 1, measurement feeler lever and reception box
3, electric unit box 1 is equipped with laser emitter 11 and laser treatment device 12；The front side of electric unit box 1 is equipped with through-hole；
Measuring feeler lever includes sleeve 2 and the optical path protection pipe 22 inside sleeve 2, and the rear end of sleeve 2 is fixedly arranged
In the inside edge of through-hole, the inside of the rear end of sleeve 2 is equipped with optical splitter 21, and optical splitter 21 includes that spectroscope and two are set to light splitting
The lens barrel of mirror front end, lens barrel can collapse deflecting light beams, so that generating clearly boundary relatively between two light beams, improve light beam
The emission port of intensity and quality, laser emitter 11 is corresponding with spectroscope position, and the front end of lens barrel is equipped with protection eyeglass, protective glass
Piece can prevent extraneous particulate matter 5 from entering inside lens barrel, and lens barrel includes measurement lens barrel and calibration lens barrel, and the front end of sleeve 2 is set
There is fixed lid 24, the middle part of sleeve 2 is equipped with retainer plate 23, and fixed lid 24 and retainer plate 23 are equipped with protection pore and optical fiber tube
Hole, optical path protection pipe 22 are fixed in protection pore, and the position of optical path protection pipe 22 is corresponding with calibration lens barrel position, protect pore
It is respectively used to fixed optical path protection pipe 22 and optical fiber tube 4 with optical fiber pore, optical path protection pipe 22 collapses calibration for second protection
Light beam 26, so that the direction of calibration beam 26 and intensity are more in line with alignment requirements；Optical fiber tube 4, optical fiber are equipped in optical fiber pore
The rear end of pipe 4 is stretched in electric unit box 1, and the front end of optical fiber tube 4, which is stretched at 2 outside of sleeve and connects, receives box 3, optical fiber
The presence of pipe 4, which is connected to, receives box 3 and measurement feeler lever, realizes being fixedly connected between the two；
It receives and is equipped with laser pickoff 31 in box 3, laser pickoff 31 is equipped with receiver board, and the position of receiver board and optical path are protected
22 position of pillar is corresponding, so that the position that calibration beam 26 with direct projection on receiver board, can measure lens barrel, which is higher than, connects tabula rasa position,
So that measuring beam 25, only when being irradiated to particulate matter 5 and scattering, the forward scattering light of generation can just be received plate reception,
Optical fiber 41 is connected between laser pickoff 31 and laser treatment device 12, optical fiber 41 is transmitted for signal, and optical fiber 41 is set to optical fiber
In pipe 4；
Fixed lid 24 is additionally provided with loophole, and loophole is corresponding with two lens barrel positions, and the rear end for receiving box 3 is equipped with and light transmission
Hole is corresponding to connect unthreaded hole.Be connected in the rear end of sleeve 2 and electric unit box 1, facilitates laser emitter 11 by Laser emission to dividing
On light microscopic, and measuring beam 25 and calibration beam 26 are reflected by spectroscope, in 26 direct projection to receiver board of calibration beam, measures light
Beam 25 only can be just mapped on receiver board by the forward scattering light of particulate matter 5, have receiver board to receive calibration beam 26 and measurement
The forward scattering light of light beam 25, and optical signal is sent to laser treatment device 12 by optical fiber 41, complete the transmission of signal；
Specifically, sleeve 2 is equipped with purging interface corresponding with protection lens position, purging interface is connected with blower, optical fiber
4 ontology of pipe is equipped with air port corresponding with purging interface position, facilitates purging protection eyeglass, and laser treatment device 12 is equipped with digital-to-analogue conversion
Device and data storage, convenient that light data are converted and stored, the inside edge of through-hole is equipped with the first screw thread, sleeve 2
The outside of rear end be equipped with matched second screw thread of the first screw thread, spectroscope is prism, measurement lens barrel and calibrate lens barrel with
Prism position is corresponding.
The principle of the present invention and the course of work are as follows: be powered to the present invention, laser emitter 11 emits laser, by trigone
Mirror, light are injected from the one side of prism, are projected from another face, while to third face deviation, generating the parallel light beam of twice,
Twice light beam is projected from measurement lens barrel and calibration lens barrel to loophole respectively, is respectively formed measuring beam 25 and calibration beam 26,
The effect of lens barrel at this time mainly concentrates twice light beam, it is made to retain the consistent light of the depth of parallelism as far as possible, collapses because of trigone
The refraction of mirror and the scattering light of entanglement formed, convection light, guarantee the consistency of light beam light, so that it is clear to obtain relative limit
Clear twice light beam, in the present embodiment, measuring beam 25 is located at eminence, and calibration beam 26 is relatively low, and calibration beam 26 arrives
Optical path protection pipe 22 can be passed through before up to loophole, avoided in the distance in calibration lens barrel to loophole, light weakens,
Gathering processing further is carried out to calibration beam 26, to guarantee the intensity of calibration beam 26；
Measuring beam 25 by loophole and connects the measured zone between unthreaded hole, is measuring after projecting from measurement lens barrel
When light beam 25 is irradiated to the particulate matters 5 such as dust, it may occur that scattering, scattering at this time are comprehensive light scatterings, but due to
The position of measurement lens barrel is above the position for connecing tabula rasa, thus from measurement lens barrel the measuring beam 25 that projects will not direct projection to
It connects on tabula rasa, is only radiated at a part of forward scattering light generated on particulate matter 5 and can be mapped to and connect on tabula rasa, and optical path is protected
The position of pipe 22 is corresponding with the position of receiver board, so calibration beam 26 is in direct projection to receiver board；
Receiver board is transmitted to laser treatment device 12 from light after receiving light beam, by information, by the analog signal of light intensity
Digital signal is converted to by digital analog converter, and is stored in data storage, which can also be reached and this
Associated with device in computer, data processing is carried out using computer；
During work measurement, purging interface accesses blower, prevents protective glass on piece to be infected with particulate matter 5, causes light beam
Scattering, has an impact final measurement, and optical fiber tube 4 is equipped with air port corresponding with purging interface position, facilitates gas
Stream so that also there is free flow of air before receiver board, is not easy to be infected with particulate matter 5, due to logical from being flowed into optical fiber tube 4 in reception box 3
The effect for entering air-flow is only prevented from the contamination of particulate matter 5, so only needing minimum air-flow, therefore air-flow will not cause to survey
Measure the variation of 5 concentration of regions particulate object.
Advantage of the invention are as follows: calibration beam 26 is after optical path protection pipe 22, in direct projection to receiver board, calibration beam 26
Intensity is guaranteed, so that measuring beam 25 after being irradiated to particulate matter 5 only before generating with more referring to and calibrating meaning
Plate can be just received to scattering light to receive, the main body light of measuring beam 25 itself will not have an impact receiver board, so surveying
Dose-effect fruit could more precisely.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, although referring to aforementioned reality
Applying example, invention is explained in detail, for those skilled in the art, still can be to aforementioned each implementation
Technical solution documented by example is modified or equivalent replacement of some of the technical features.It is all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (5)
1. a kind of double light path laser forward scattering measuring concentration of granules in certain device, which is characterized in that including electric unit box, measurement
Feeler lever and reception box, the electric unit box are equipped with laser emitter and laser treatment device；The front side of the electric unit box
Equipped with through-hole；
The measurement feeler lever includes sleeve and the optical path protection pipe set on the sleeve inner, and the rear end of the sleeve fixedly covers
Set on the inside edge of the through-hole, the inside of the rear end of the sleeve is equipped with optical splitter, and the optical splitter includes spectroscope and two
A lens barrel set on the spectroscope front end, the emission port of the laser emitter is corresponding with the spectroscope position, the mirror
The front end of cylinder is equipped with protection eyeglass, and the lens barrel includes measurement lens barrel and calibration lens barrel, and the front end of the sleeve is equipped with fixed lid,
The middle part of the sleeve is equipped with retainer plate, and the fixed lid and the retainer plate are equipped with protection pore and optical fiber pore, described
Optical path protection pipe is fixed in the protection pore, and the position of the optical path protection pipe is corresponding with the calibration lens barrel position, institute
It states and is equipped with optical fiber tube in optical fiber pore, the rear end of the optical fiber tube is stretched in the electric unit box, before the optical fiber tube
End is stretched at the cartridge exterior and connects the reception box；
Laser pickoff is equipped in the reception box, the laser pickoff is equipped with receiver board, the position of the receiver board and institute
It states optical path protection pipe position to correspond to, the position of the measurement lens barrel meets tabula rasa position, the laser pickoff and institute higher than described
It states and is connected with optical fiber between laser treatment device, the optical fiber is set in the optical fiber tube；
The fixed lid is additionally provided with loophole, and the loophole is corresponding with two lens barrel positions, the rear end for receiving box
Unthreaded hole is connect equipped with corresponding with the loophole.
2. a kind of double light path laser forward scattering measuring concentration of granules in certain device according to claim 1, which is characterized in that
The sleeve is equipped with purging interface corresponding with the protection lens position, and the purging interface is connected with blower, the optical fiber
Tube body is equipped with air port corresponding with the purging interface position.
3. a kind of double light path laser forward scattering measuring concentration of granules in certain device according to claim 1, which is characterized in that
The laser treatment device is equipped with digital analog converter and data storage.
4. a kind of double light path laser forward scattering measuring concentration of granules in certain device according to claim 1, which is characterized in that
The inside edge of the through-hole is equipped with the first screw thread, and the outside of the rear end of the sleeve is equipped with and first screw thread matched second
Screw thread.
5. a kind of double light path laser forward scattering measuring concentration of granules in certain device according to claim 1, which is characterized in that
The spectroscope is prism, and the measurement lens barrel and the calibration lens barrel are corresponding with the prism position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811562577.6A CN109520903A (en) | 2018-12-20 | 2018-12-20 | A kind of double light path laser forward scattering measuring concentration of granules in certain device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811562577.6A CN109520903A (en) | 2018-12-20 | 2018-12-20 | A kind of double light path laser forward scattering measuring concentration of granules in certain device |
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Family
ID=65795546
Family Applications (1)
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| CN201811562577.6A Pending CN109520903A (en) | 2018-12-20 | 2018-12-20 | A kind of double light path laser forward scattering measuring concentration of granules in certain device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110487688A (en) * | 2019-09-06 | 2019-11-22 | 宁波方太厨具有限公司 | The particulate matter detection means and detection method of kitchen ventilator |
| CN111175250A (en) * | 2019-04-08 | 2020-05-19 | 南京林业大学 | Real-time measurement method and device for explosion grade of wood dust |
| CN111665173A (en) * | 2020-07-07 | 2020-09-15 | 南京大得科技有限公司 | Forward scattering type dust concentration measuring instrument |
| CN114324098A (en) * | 2022-03-10 | 2022-04-12 | 南京波瑞自动化科技有限公司 | Double-light-path laser forward scattering particulate matter concentration measuring device |
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| CN110487688A (en) * | 2019-09-06 | 2019-11-22 | 宁波方太厨具有限公司 | The particulate matter detection means and detection method of kitchen ventilator |
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| CN114324098A (en) * | 2022-03-10 | 2022-04-12 | 南京波瑞自动化科技有限公司 | Double-light-path laser forward scattering particulate matter concentration measuring device |
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