CN106769737A - A kind of optical fiber type apparatus for measuring dust concentration - Google Patents
A kind of optical fiber type apparatus for measuring dust concentration Download PDFInfo
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- CN106769737A CN106769737A CN201710038146.9A CN201710038146A CN106769737A CN 106769737 A CN106769737 A CN 106769737A CN 201710038146 A CN201710038146 A CN 201710038146A CN 106769737 A CN106769737 A CN 106769737A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 88
- 239000000428 dust Substances 0.000 title claims abstract description 56
- 238000005259 measurement Methods 0.000 claims abstract description 103
- 238000006243 chemical reaction Methods 0.000 claims abstract description 28
- 230000003287 optical effect Effects 0.000 claims abstract description 25
- 238000012545 processing Methods 0.000 claims abstract description 13
- 238000012360 testing method Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 abstract description 7
- 239000000843 powder Substances 0.000 abstract description 4
- 238000009826 distribution Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 5
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000000265 homogenisation Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000009738 saturating Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 241001270131 Agaricus moelleri Species 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000000205 computational method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010892 electric spark Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009828 non-uniform distribution Methods 0.000 description 1
- 238000004204 optical analysis method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 210000002345 respiratory system Anatomy 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 238000007655 standard test method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- 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
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- 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—Investigating concentration of particle suspensions by optical means
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Abstract
The present invention relates to powder concentration measurement technical field, a kind of optical fiber type apparatus for measuring dust concentration is specifically disclosed, successively including light source part, input optical fibre, measurement part, output optical fibre, signal conversion part point and data processing section.Measurement portion point includes beam splitter and the first measurement zone being made up of the first transmitting terminal, the first decay area, the first receiving terminal, head rod and the second measurement zone being made up of the second transmitting terminal, the second decay area, the second receiving terminal, the second connecting rod.Laser is divided into by beam splitter and respectively enters the first measurement zone after the first light path and the second light path and measured with the second measurement zone, signal conversion part point is delivered to by output optical fibre after measurement and converts optical signal into electric signal, the electric signal that data processing section passes through to receive calculates laser attenuation coefficient.The present invention utilizes the method for double-optical path, calculus of differences to eliminate measurement error, improves certainty of measurement.
Description
Technical field
The present invention relates to powder concentration measurement field, more particularly to a kind of optical fiber type apparatus for measuring dust concentration.
Background technology
The measuring method of dust concentration mainly includes Optical Analysis Method and non-optical analytic approach, and non-optical analytic approach is due to inspection
Measurement equipment response speed is slow, treatment is complicated, it is difficult to carry out real-time monitoring to dust concentration.And it is based on the dust concentration of optical analysis
The features such as e measurement technology has detectivity high, selectivity strong, fast response time, is adapted to real time monitoring, and cost compared with
It is low, the Perfected process of powder concentration measurement after being.
Existing hand-held apparatus for measuring dust concentration necessarily requires operating personnel to measure at the scene, and similar to coal
In ore deposit mine dust concentration environment high, operating personnel must carry out dust prevention in measurement, can otherwise damage respiratory tract, shadow
Ring health.Existing chemical equation sensor of dust concentration, it is necessary to be acquired treatment to air-borne dust, with measurement time delay
Difference, it is impossible to measured in real time；Electric-type apparatus for measuring dust concentration security is poor, when mine dust concentration is too high, slightly
Electric spark can trigger the risk of mine explosion.And for optical fiber type sensor of dust concentration, enter traveling optical signal using optical fiber remote
Propagation, it is possible to achieve long-range measurement, but measuring instrument is located at soot region high, and rear instrument surface or instrument are used for a long time
Must dust deposit, influence certainty of measurement in device.
The content of the invention
For problems of the prior art, the present invention provides a kind of optical fiber type apparatus for measuring dust concentration, by light
Optical signal is spread out of, and missed by two-way photo measure fibre optical signal transmission to measured zone through optical fiber again after measurement
Difference is eliminated, and not only realizes long-range measurement, also improves certainty of measurement.
A kind of optical fiber type apparatus for measuring dust concentration that the present invention is provided, including light source part, measurement part turn with signal
Part is changed, light source part is connected with measurement part by input optical fibre, and measurement part passes through output optical fibre with signal conversion part point
Connection, wherein Measurement portion point include beam splitter and the first measurement zone and the second measurement zone, and beam splitter input is defeated with input optical fibre
Go out end to be fixedly connected, laser is divided into the first light path and the second light path by beam splitter, the first light path enters the first measurement zone, the second light
Road enters the second measurement zone；Measurement part is located at measure field, and measurement is partially away from light source part and signal conversion part point.
Further, light source part includes laser and coupler, and wherein laser launches laser and passes through coupler coupling
Transmitted after conjunction to input optical fibre.
Further, the first measurement zone includes the first transmitting terminal, the first decay area, the first receiving terminal, head rod, the
Two measurement zones include the second transmitting terminal, the second decay area, the second receiving terminal, the second connecting rod, wherein the first transmitting terminal and first
Receiving terminal is fixedly connected by head rod；Second transmitting terminal is fixedly connected with the second receiving terminal by the second connecting rod；First declines
Subtract area to be located between the first transmitting terminal and the first receiving terminal, the second decay area is located between the second transmitting terminal and the second receiving terminal,
The under test gas containing dust are in first decay area and the second decay；Light path of first light path in the first decay area is less than second
Light path of the light path in the second decay area.
Further, the first transmitting terminal includes first collimator and the first outgoing mirror, and the second transmitting terminal includes the second collimation
Device and the second outgoing mirror, wherein the distance between first collimator and the first outgoing mirror and the second collimater and the second outgoing mirror it
Between distance it is identical；First light path by the first outgoing mirror after first collimator by being irradiated to the first decay area, the second light path
By being irradiated to the second decay area by the second outgoing mirror after the second collimater, the first light path positioned at the first decay area be located at
Second light path of the second decay area is parallel.
Further, the first transmitting terminal also includes the first simple lens reshaper, and the second transmitting terminal also includes the second simple lens
Reshaper, wherein the first simple lens reshaper is arranged between first collimator and the first outgoing mirror, the first light path is by first
After collimater, then first will be irradiated to by the first outgoing mirror after laser energy uniform spatial distribution through the first simple lens reshaper
Decay area；Second simple lens reshaper is arranged between the second collimater and the second outgoing mirror, and the second light path is by the second collimation
After device, then the second decay will be irradiated to by the second outgoing mirror after laser energy uniform spatial distribution through the second simple lens reshaper
Area.
Further, the first receiving terminal includes the first input mirror and the 3rd collimater, and the second receiving terminal includes the second input
Mirror and the 4th collimater, the 3rd collimater is irradiated into after the first light path of the first decay area is irradiated into the first input mirror again,
The 4th collimater is irradiated into again after the second light path of the second decay area is irradiated into the second input mirror.
Further, first collimator is identical with the placement direction of the second collimater, the 3rd collimater and the 4th collimater
Placement direction is identical, and the placement direction of first collimator and the 3rd collimater is conversely, the second collimater and the 4th collimater are put
Put in opposite direction.
Further, output optical fibre includes the first output optical fibre and the second output optical fibre, wherein the first output optical fibre is defeated
Enter the output end of the first measurement zone of end connection, the input of the second input optical fibre connects the output end of the second measurement zone, and first is defeated
The output end for going out optical fiber and the second output optical fibre is all connected with signal conversion part point.
Further, signal conversion part point includes the first detector and the second detector, wherein the first detector and first
The output end connection of output optical fibre, the second detector is connected with the output end of the second output optical fibre；First detector is by the first light
The optical signal on road is converted into electric signal, and the optical signal of the second light path is converted into electric signal by the second detector.
Further, also including data processing section, data processing section is connected with signal conversion part point, signal conversion part
Divide to send electric signal to data processing section and processed.
A kind of optical fiber type apparatus for measuring dust concentration of the invention, has the advantages that：
1st, Measurement portion is divided into pure optical texture, is positioned over measure field very safe；
2nd, using optical fiber long-distance transmissions optical signal, long-range measurement dust concentration is realized；
3rd, double-optical path method, measurement error is eliminated using calculus of differences, improves certainty of measurement；
4th, set collimater to be expanded and shrink beam laser, make attenuation of the broad-beam lasers in decay area brighter
Aobvious, the laser after shrink beam is easy to Optical Fiber Transmission；
The 5th, simple lens reshaper is set by laser energy uniform spatial distribution so that for dust concentration measurement equal
The light of even distribution is carried out off field, can improve the non-uniform Distribution problem of dust concentration in the range of measurement space to measurement result not
Profit influence；
6th, the influence using measurement zone dust concentration for expanding light intensity loss is measured, and measurement process is entered with the light velocity
OK, in the absence of delay problem, can reach real-time measurement effect.
Brief description of the drawings
For clearer the explanation embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it is clear that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is optical fiber type apparatus for measuring dust concentration of the invention composition figure ()；
Fig. 2 is grouped into figure () for optical fiber type apparatus for measuring dust concentration Measurement portion of the invention；
Fig. 3 is that optical fiber type apparatus for measuring dust concentration light source part of the invention is grouped into figure with Measurement portion；
Fig. 4 is optical fiber type apparatus for measuring dust concentration of the invention composition figure (two)；
Fig. 5 is grouped into figure (two) for optical fiber type apparatus for measuring dust concentration Measurement portion of the invention；
Fig. 6 is optical fiber type apparatus for measuring dust concentration structure chart () of the invention；
Fig. 7 is optical fiber type apparatus for measuring dust concentration structure chart (two) of the invention；
In figure：1- light sources part, 2- input optical fibres, 3- measurements part, 4- output optical fibres, 5- signal conversion parts point, 6- divide
Beam device, the measurement zones of 7- first, the measurement zones of 8- second, the light paths of 9- first, the light paths of 10- second, 11- lasers, 12- couplers, 13-
First output optical fibre, the output optical fibres of 14- second, the transmitting terminals of 15- first, the receiving terminals of 16- first, 17- head rods, 18-
Two transmitting terminals, the receiving terminals of 19- second, the connecting rods of 20- second, 21- first collimators, the outgoing mirrors of 22- first, 23- second are collimated
Device, the outgoing mirrors of 24- second, the collimaters of 25- the 3rd, the inputs of 26- first mirror, the collimaters of 27- the 4th, the inputs of 28- second mirror, 29-
First detector, the detectors of 30- second, the first simple lenses of 31- reshaper, 32- the second simple lens reshapers.
Specific embodiment
Below in conjunction with the accompanying drawing in the present invention, clear, complete retouching is carried out to the technical scheme in the embodiment of the present invention
State, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Based on the present invention
In embodiment, all other reality that those skilled in the art is obtained on the premise of creative work is not made
Example is applied, protection scope of the present invention is belonged to.
It is as shown in figure 1, the optical fiber type apparatus for measuring dust concentration of first embodiment of the invention including light source part 1, defeated
Enter optical fiber 2, measurement part 3, output optical fibre 4 and signal conversion part point 5, light source part 1 passes through input optical fibre 2 with measurement part 3
Connection, measurement part 3 is connected with signal conversion part point 5 by output optical fibre 4, and connected mode the present embodiment is not specifically limited,
Preferably, connected from flange, similarly, the connected mode in the present invention between each part is not specifically limited.
Specifically, as shown in Fig. 2 measurement part 3 includes beam splitter 6, the first measurement zone 7 and the second measurement zone 8, beam splitter
6 inputs are fixedly connected with the output end of input optical fibre 2；Light beam can be divided into two beams or multi beam by beam splitter, there is 1 × N at present
With 2 × N two types, the present embodiment from 1 × 2 beam splitter 6, laser is divided into the first light path 9 and the second light path by beam splitter 6
10, the first light path 9 enters the first measurement zone 7, and the second light path 10 enters the second measurement zone 8, to reduce measurement error, from light splitting
The preferable beam splitter 6 of uniformity, makes the first light path 9 more equal with the luminous intensity of the second light path 10；Measurement part 3 is located at measurement
Changed with light source part 1 and signal due to measuring part 3 away from light source part 1 and signal conversion part point 5 scene, measurement part 3
Part 5 is connected by the optical fiber of long range, and operating personnel can be in the position operation light source part 1 away from scene and signal conversion part
Divide 5, the long-range measurement of dust concentration is realized with this.
Specifically as shown in figure 3, light source part 1 includes laser 11 and coupler 12, the transmitting laser of laser 11 is laggard
Enter coupler 12, because the laser of the transmitting of laser 11 is approximately directional light, coupler 12 is carried out laser after coupling focusing
Transmit to input optical fibre 2, the laser after coupling is sent to input optical fibre 2 beam splitter 6 in measurement part 3, beam splitter 6
Laser is split, the first light path 9 and the second light path 10 is produced.
Specifically as shown in figure 4, output optical fibre 4 includes the first output optical fibre 13 and the second output optical fibre 14, the first output
The input of optical fiber 13 connects the output end of the first measurement zone 7, and the input of the second input optical fibre 2 connects the second measurement zone 8
The output end of output end, the first output optical fibre 13 and the second output optical fibre 14 is all connected with signal conversion part point 5, signal conversion part point
The optical signal that first output optical fibre 13 and the second output optical fibre 14 are exported is converted into electric signal by 5.
It is specific as shown in figure 5, the first measurement zone 7 include the first transmitting terminal 15, the first decay area, the first receiving terminal 16,
Head rod 17, the second measurement zone 8 includes the second transmitting terminal 18, the second decay area, the second receiving terminal 19, the second connecting rod
20；First transmitting terminal 15 is fixedly connected with the first receiving terminal 16 by head rod 17, the second transmitting terminal 18 and the second receiving terminal
19 are fixedly connected by the second connecting rod 20；First decay area is located between the first transmitting terminal 15 and the first receiving terminal 16, and second declines
Subtract area to be located between the second transmitting terminal 18 and the second receiving terminal 19.Treating containing dust is in first decay area and the second decay area
Survey gas.Light path of first light path 9 in the first decay area is less than light path of second light path 10 in the second decay area.First light path 9
After being projected by the first transmitting terminal 15, the first decay area is irradiated into, the laser of the first light path 9 after the decay of under test gas by irradiating
Enter the first receiving terminal 16；After second light path 10 is projected by the second transmitting terminal 18, the second decay area is irradiated into, the second light path 10 swashs
Light is by being irradiated into the second receiving terminal 19 after the decay of under test gas；Because the purpose of this case is that the dust of measurement under test gas is dense
Degree, so the first transmitting terminal 15 and the first receiving terminal 16 are disposed as the stronger optical path transmission device of sealing, to enter one
Step improves certainty of measurement, is identical structure, the first receiving terminal 16 by the structure setting of the first transmitting terminal 15 and the second transmitting terminal 18
It is identical structure with the structure setting of the second receiving terminal 19, the light path due to the first light path 9 in the first decay area is less than the second light
Road 10 the second decay area light path, so the attenuation of the first light path 9 less than the second light path 10 attenuation.
Specifically as shown in fig. 6, the first transmitting terminal 15 includes the outgoing mirror 22 of first collimator 21 and first, the second transmitting terminal
18 include the second collimater 23 and the second outgoing mirror 24, and first collimator 21 is identical with the placement direction of the second collimater 23, is used for
The first measurement zone 7 of input is expanded with the laser of the second measurement zone 8, is become two beamwidth Shu Guang, the first light path 9 is changed into first
Wide beam light is irradiated into the first decay area by the first outgoing mirror 22, and the second light path 10 is changed into the second wide beam light by the second outgoing mirror
24 are irradiated into the second decay area, and the first wide beam light positioned at the first decay area is mutual with the second wide beam light for being located at the second decay area
It is parallel.First receiving terminal 16 includes the first input collimater 25 of mirror 26 and the 3rd, and the second receiving terminal 19 includes the second input mirror 28
With the 4th collimater 27, the 3rd collimater 25 is identical with the placement direction of the 4th collimater 27, but with first collimator 21 and second
The placement direction of collimater 23 conversely, be irradiated into again after the first input mirror 26 is injected in the first wide beam illumination of the first decay area
3rd collimater 25 carries out shrink beam focusing, is irradiated again after the second light path 10 of the second decay area is irradiated into the second input mirror 28
Entering the 4th collimater 27 carries out shrink beam focusing.The distance between first input collimater 25 of mirror 26 and the 3rd and the second input mirror 28
It is identical with the distance between the 4th collimater 27.The output end of the 3rd collimater 25 connects with the input of the first output optical fibre 13
Connect, the output end of the 4th collimater 27 is connected with the input of the second output optical fibre 14.Preferably, first collimator 21 and first
Outgoing mirror 22, the 3rd collimater 25, first are input into the geometric center of mirror 26 on same straight line, and with the first light path 9 the
Propagation path in one measurement zone 7 coincides, and the second collimater 23 and the second outgoing mirror 24, the 4th collimater 27, second are input into
On the same line, and propagation path with the second light path 10 in the second measurement zone 8 coincides the geometric center of mirror 28, makes
One light path 9 and the second light path 10 by the first measurement zone 7 and the second measurement zone 8, are reduced as far as laser and exist to greatest extent
Loss in transfer element, it is ensured that the first light path 9 and the second light path 10 have identical communication environments in transfer element, to improve
The precision of powder concentration measurement.
Measurement part 3 is pure Optical devices, installed in mine or easily occur in the measuring environment of accident security performance compared with
It is high.Signal conversion part points 5 includes the first detector 29 and the second detector 30, the first detector 29 and the first output optical fibre 13
Output end is fixedly connected, and the second detector 30 is fixedly connected with the output end of the second output optical fibre 14；First detector 29 is by
The optical signal of one light path 9 is converted into electric signal, and the optical signal of the second light path 10 is converted into electric signal by the second detector 30.
Specifically, a kind of optical fiber type apparatus for measuring dust concentration of the present embodiment also includes data processing section, at data
Reason part is connected with signal conversion part point 5, and electric signal is sent to data processing section and processed by signal conversion part point 5.Number
Calculated by the electric signal of the conveying of signal conversion part point 5 according to process part, finally drawn laser attenuation coefficient.
It is specific as shown in fig. 7, second embodiment optical fiber type apparatus for measuring dust concentration of the invention, in first reality
Apply on the basis of example, the first transmitting terminal 15 also includes the first simple lens reshaper 31, the second transmitting terminal 18 also includes that second is single saturating
Mirror reshaper 32.Because the laser transmitted to measurement part 3 by input optical fibre 2 is carried out after coupler 12 is coupled and focused on
Transmission, although first light path 9 is expanded with the second light path 10 with the second collimater 23 by first collimator 21, is become
First wide beam light and the second wide beam light, but the first wide beam light and the second wide beam just Gauss light, optical cross-section Energy distribution are uneven
Even, if shining directly into the first decay area carries out the decay of laser, it is larger to occur error when later data is analyzed, so
First simple lens reshaper 31 is arranged between the outgoing mirror 22 of first collimator 21 and first, the second simple lens reshaper 32 is pacified
Between the second collimater 23 and the second outgoing mirror 24, the first wide beam light is equal by laser energy through the first simple lens reshaper 31
After homogenizing, then it is irradiated to the first decay area and carries out laser attenuation, similarly, the second wide beam light will through the second simple lens reshaper 32
After laser energy homogenization, then it is irradiated into the second decay area and carries out laser attenuation.First simple lens reshaper 31 and second is single saturating
Mirror reshaper 32 selects identical aspherical lens, and depending on the design of lens surface is according to use environment, the present invention does not do specific
Limit, only need to reach the purpose that Gauss light is changed into flat-top light.To avoid unnecessary error, by first collimator 21
And first the distance between simple lens reshaper 31 be arranged between the second collimater 23 and the second simple lens reshaper 32
Apart from equal.The present embodiment sets the first simple lens reshaper 31 and the second simple lens reshaper 32 by laser energy spatial distribution
Homogenization, makes the first wide beam light and the second wide beam light more uniform with decay in the second decay area in the first decay area, and then
The result for processing later data is more accurate.
The present embodiment is measured respectively by two-way light under test gas, and calculates laser attenuation system according to measurement data
Number, because the dust concentration of attenuation coefficient and under test gas has certain proportionate relationship, just can be according to certain proportionate relationship meter
Calculate the dust concentration of under test gas.Its measurement process of the optical fiber type apparatus for measuring dust concentration of the present embodiment and laser attenuation system
Several specific algorithms is as follows：
The output light of laser 11 is divided into two-way by entering input optical fibre 2 after the coupling of coupler 12 by by beam splitter 6
Light is transmitted, and the first light path 9 is projected after being expanded into first collimator 21 from the first outgoing mirror 22, is set from the first outgoing mirror
22 laser intensities for projecting are I, and the second light path 10 projects after being expanded into the second collimater 23 from the second outgoing mirror 24, setting from
The laser intensity that second outgoing mirror 24 is projected is I ', and the first wide beam light is irradiated into the first input mirror after the first decay area is decayed
26 light intensity is I1, the light intensity that the second wide beam light is irradiated into the second input mirror 28 after the second decay area is decayed is I2, first is accurate
The distance of the straight collimater 25 of device 21 and the 3rd is l1, the distance of the second collimater 23 and the 4th collimater 27 is l2, setting decay system
Number is α, thenBecause the first light path 9 is equally divided into the second light path 10 by beam splitter 6
Two-beam, and first collimator 21 is identical with the second collimater 23, so I=I ', therefore calculate α=ln (I2/I1)/
(l1-l2).Apart from l1With l2During for fixed value, the light intensity I of the 3rd collimater 25 and the 4th collimater 27 is entered by measuring1With
I2, just can calculate attenuation coefficient α of the under test gas to laser.Declined because certain dust concentration correspond to certain laser
Subtract coefficient, and in actual applications, it is right between dust concentration and laser attenuation coefficient to be determined by standard test method
Should be related to, just dust concentration can be calculated according to experiment value in the measurements.
Preferably, 1 × 3 beam splitter 6 is can select, now needs to add the 3rd measurement zone and the 3rd detector, and the 3rd surveys
Amount area is identical with the light transmission device structure of the first measurement zone 7, the second measurement zone 8, and difference is the 3rd light path in the 3rd decay
The light path in the second decay area of light path, the second light path of the light path in area and the first light path in the first decay area is different, beam splitting
Again by being transmitted after the 3rd measurement zone to the 3rd detector, the 3rd detector converts optical signal into electricity to the 3rd light path that device is produced
Sent after signal to data processing section, its computational methods still using being averaged again after Difference Calculation method, Neng Gougeng
It is effective to improve certainty of measurement.
Whole optical fiber type apparatus for measuring dust concentration, on the basis of realizing that long-range measurement is set with simple lens reshaper,
Beam of laser is equally divided into two beams with beam splitter, two-beam is injected respectively path length not wait environment same to be measured in
Measure, after two-beam is through decay, exported to away from measurement two-beam by the first output optical fibre and the second output optical fibre
The signal conversion part in area point, signal conversion part point converts optical signals to electric signal, and electric signal is input into data processing division
Divide and calculated, finally draw the dust concentration of under test gas.Due to removing the first decay area in this programme with the second decay area
Beyond light path is unequal, other measuring environments are identical, so calculating laser using optical path difference in follow-up Difference Calculation
Attenuation coefficient, elimination is made the difference by all of error, and the calculated value degree of accuracy of gained is higher.
The present invention is further described by specific embodiment above, it should be understood that, here specifically
Description, should not be construed as the restriction to the spirit and scope of the invention, and one of ordinary skilled in the art is reading this explanation
The various modifications made to above-described embodiment after book, belong to the scope that the present invention is protected.
Claims (10)
1. a kind of optical fiber type apparatus for measuring dust concentration, it is characterised in that including light source part, measurement part and signal conversion part
Point, the light source part is connected with the measurement part by input optical fibre, described to measure part and the signal conversion part point
Connected by output optical fibre, wherein：
The Measurement portion point includes beam splitter and the first measurement zone and the second measurement zone, the beam splitter input and the input
Fiber-optic output is fixedly connected, and laser is divided into the first light path and the second light path by the beam splitter, and first light path enters institute
The first measurement zone is stated, second light path enters second measurement zone；
The measurement part is located at measure field, and the measurement is partially away from the light source part and the signal conversion part point.
2. a kind of optical fiber type apparatus for measuring dust concentration as claimed in claim 1, it is characterised in that the light source part includes
Laser and coupler, wherein：
The laser transmitting laser is simultaneously transmitted to the input optical fibre after the coupler is coupled.
3. a kind of optical fiber type apparatus for measuring dust concentration as claimed in claim 1, it is characterised in that the first measurement zone bag
Include the first transmitting terminal, the first decay area, the first receiving terminal, head rod, second measurement zone includes the second transmitting terminal, the
Two decay areas, the second receiving terminal, the second connecting rod, wherein：
First transmitting terminal is fixedly connected with first receiving terminal by the head rod；Second transmitting terminal and institute
The second receiving terminal is stated to be fixedly connected by second connecting rod；
First decay area is located between first transmitting terminal and first receiving terminal, and second decay area is located at institute
State between the second transmitting terminal and second receiving terminal, be containing dust in first decay area and second decay area
Under test gas；
Light path of first light path in first decay area is less than light path of second light path in second decay area.
4. a kind of optical fiber type apparatus for measuring dust concentration as claimed in claim 3, it is characterised in that the first transmitting terminal bag
First collimator and the first outgoing mirror are included, second transmitting terminal includes the second collimater and the second outgoing mirror, wherein：
The distance between the first collimator and described first outgoing mirror and second collimater and second outgoing mirror
The distance between it is identical；
First light path by first outgoing mirror after first collimator collimation by being irradiated to first decay
Area, second light path by second outgoing mirror after second collimating device collimation by being irradiated to second decay
Area, first light path positioned at first decay area is parallel with second light path positioned at second decay area.
5. a kind of optical fiber type apparatus for measuring dust concentration as claimed in claim 4, it is characterised in that first transmitting terminal is also
Including the first simple lens reshaper, second transmitting terminal also includes the second simple lens reshaper, wherein：
The first simple lens reshaper is arranged between the first collimator and first outgoing mirror, first light path
By the first collimator, then by first outgoing mirror after through the first simple lens reshaper, laser energy is homogenized
It is irradiated to first decay area；
The second simple lens reshaper is arranged between second collimater and second outgoing mirror, second light path
By second collimater, then by second outgoing mirror after through the second simple lens reshaper, laser energy is homogenized
It is irradiated to second decay area.
6. a kind of optical fiber type apparatus for measuring dust concentration as claimed in claim 5, it is characterised in that the first receiving terminal bag
The first input mirror and the 3rd collimater are included, second receiving terminal includes the second input mirror and the 4th collimater, wherein：
It is accurate that the described 3rd is irradiated into again after first light path of first decay area is irradiated into the first input mirror
Straight device, the 4th standard is irradiated into after second light path of second decay area is irradiated into the second input mirror again
Straight device.
7. a kind of optical fiber type apparatus for measuring dust concentration as claimed in claim 6, it is characterised in that the first collimator with
The placement direction of second collimater is identical, and the 3rd collimater is identical with the 4th collimater placement direction, described
The placement direction of first collimator and the 3rd collimater is conversely, the placement of second collimater and the 4th collimater
In the opposite direction.
8. a kind of optical fiber type apparatus for measuring dust concentration as claimed in claim 7, it is characterised in that the output optical fibre includes
First output optical fibre and the second output optical fibre, wherein：
The input of first output optical fibre connects the output end of first measurement zone, the input of second input optical fibre
The output end of end connection second measurement zone, first output optical fibre is all connected with the output end of second output optical fibre
The signal conversion part point.
9. a kind of optical fiber type apparatus for measuring dust concentration as claimed in claim 8, it is characterised in that the signal conversion part point
Including the first detector and the second detector, wherein：
First detector is connected with the output end of first output optical fibre, and second detector and described second is exported
The output end connection of optical fiber；
The optical signal of first light path is converted into electric signal by first detector, and second detector is by described second
The optical signal of light path is converted into electric signal.
10. a kind of optical fiber type apparatus for measuring dust concentration as described in any one of claim 1 to 9, it is characterised in that also include
Data processing section, wherein：
The data processing section and the signal conversion part point be connecteds, and the signal conversion part divides and sends to described electric signal
Data processing section is processed.
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