CN108693079A - Particle flow parameter measuring apparatus and method based on laser backscatter method - Google Patents
Particle flow parameter measuring apparatus and method based on laser backscatter method Download PDFInfo
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- CN108693079A CN108693079A CN201810341652.XA CN201810341652A CN108693079A CN 108693079 A CN108693079 A CN 108693079A CN 201810341652 A CN201810341652 A CN 201810341652A CN 108693079 A CN108693079 A CN 108693079A
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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
Abstract
The invention discloses a kind of particle flow parameter measuring apparatus and method based on laser backscatter method.Wherein measuring device includes:One fibre-optical probe sends out the laser for being irradiated to soot region and acquires the scattering light of soot region;The optical signal of the reference light and scattering light is converted to electric signal by one photoelectric switching circuit;The particle flow parameter of soot region is calculated according to the electric signal that power conversion circuit obtains for one computer.The present invention eliminates multi-laser and works the asynchronous negative effect brought using the sonde configuration of single laser fiber branch, while drawing light all the way and be used as and referring to light, improves the accuracy of measurement of system.Opto-electronic conversion and signal processing circuit convert the collected rear orientation light comprising particle flow information to electric signal, realize that granule density measures.Meanwhile the flow velocity degree of particle is calculated using binary channels cross correlation algorithm.To realize flow particles speed, concentration and the integrated measuring of flow.
Description
Technical field
The invention belongs to particle flow field of measuring technique, and in particular to a kind of particle stream based on laser backscatter method
Dynamic parameter measuring apparatus and method.
Background technology
Particle flow system is widely present in multiple industrial circles such as the energy, chemical industry and metallurgy.Realize Dual-Phrase Distribution of Gas olid stream
Online, the accurate measurement of amount realizes that energy conservation and environmental protection is of great significance to improving industrial production efficiency.Particle flow parameter
Measurement is frequently accompanied by severe measuring condition, such as vibration, high temperature, high pressure, these factors are to particle flow parameter accurate
It measures and equipment installation brings very big difficulty.With the development of sensing technology, miscellaneous sensor is widely used
In the measurement of multiphase flow, there is great progress in terms of measuring apparatus accuracy and stability.However, industrial production is automatic
Change, intelligent level is also improved constantly, these equipment due to the limitation in its measurement method and hardware design not
The measurement standard of requirements at the higher level can be met.
Laser backward scattered light method have many advantages, such as it is non-contact, be quick on the draw, required parameter is few, measurement range is big,
In on-line checking applied to Dual-Phrase Distributions of Gas olid such as Flue dusts.The basic principle of laser backscatter method is to work as laser irradiation
It can be scattered to all directions after solid particle group, by being received to position to scattered light signal rear and doing corresponding analysis
Processing goes out the concentration of particle according to the intensity Real-time Feedback of scattering light.Meanwhile it being calculated by the method for multi channel signals cross-correlation
Go out particle swarm flowing velocity, to realize gas-solid rolling particles flowing velocity, concentration and flow integrated measuring.
Scattering method particle flow parameter measurement system mostly uses greatly lens, grating etc. as original light path adjustment and corrected
Part causes light path coupling centering difficult, and light path easily shifts.The measuring system of even now sometimes may be used in experimental study
To obtain more satisfactory measurement result, however under the severe measuring condition such as the vibrations in industry spot, high temperature, high pressure, easily
There is phenomena such as system drifting, light path offset, laser power is unstable, measurement is produced bigger effect or even made to measurement result
As a result it fails.Currently, some the back-scatteringme thod particle flow parameter measurement equipments developed in the market, under certain condition may be used
To measure the speed, concentration and flow of particle flow.However, these equipment are in light path and hardware design and optical component type selecting
Etc. the reason of have some limitations.It is mainly reflected in:The offset of light path easily occurs in long-term use for optical system
With the drift of system, measurement accuracy is seriously affected;More lenticulation etc. has been used in light path design design, has been improved into
This, while reducing the stability of measuring system;Optic probe volume is larger, there is certain influence to reduce to measurement object
Measurement accuracy;The speed and concentration of particle flow fail realize integrated measuring, most equipment can only solely measuring speed or
Person's concentration.
Invention content
Technical problem:
The technical problem to be solved by the present invention is in view of the deficiency of the prior art, and provide a kind of stability
Good and side particle flow parameter measuring apparatus and method with high accuracy based on laser backscatter method.
Technical solution:
In order to solve the above technical problems, the technical solution adopted by the present invention is:
A kind of particle flow parameter measuring apparatus based on laser backscatter method, which is characterized in that including:
One fibre-optical probe sends out the laser for being irradiated to soot region and acquires the scattering light of soot region, including:Swash
Light device, one point of three fiber optic bundle, optical fiber pass light beam and GRIN Lens;The laser sends out beam of laser;Described one point three
A branch of measurement laser is divided into reference light to fiber optic bundle and two beams measure light;The optical fiber passes light beam and is used for transmission the measurement
The rear orientation light of light and particle;The GRIN Lens carries out two-way optical coupling to the measurement light and scattering light;
The optical signal of the reference light and scattering light is converted to electric signal by one photoelectric switching circuit;
The particle flow parameter of soot region is calculated according to the electric signal that power conversion circuit obtains for one computer.
Optical fiber passes light beam by inner ring fiber optic bundle, outer ring fiber optic bundle and the gold between inner ring fiber optic bundle and outer ring fiber optic bundle
Belong to isolated tube composition;Inner ring fiber optic bundle is used to collect and transmit the rear orientation light of particle, and outer ring fiber optic bundle is used for transmission measurement
Light.
It is passed in light beam in the optical fiber and is additionally provided with air intake passage, passing light beam end in the optical fiber is additionally provided with outlet air
Ring, it is described go out vane side on be provided with V-arrangement blowing mouth, the V-arrangement blowing mouth is connected to the air intake passage.
The particle flow parameter includes granule density, and granule density is:
Two channel detections of probe are converted into particle rear orientation light and the reference light separated through photodiode
Electric signal, and after being handled by modulation circuit, the signal sequence x (t) changed over time is collected by data acquisition circuit respectively,
Y (t), I (t);Wherein x (t) is the signal sequence in channel one, and y (t) is the signal sequence in channel two, and I (t) is the letter of reference light
Number sequence;C1, C2Respectively x (t) and the values of y (t) at a time, I0For I (t) values at the moment;
By moment reference light I0As benchmark, collected Particle Concentration Signals indicate as follows:
In formula, i=1,2;
Step 2: being calculate by the following formula out the local concentration β of pipeline section particle1,β2And mean concentration
βi=f (hi) (2)
In formula, f () is the h demarcatediWith βiBetween relation function, determined by experimental calibration.
Demarcate hiWith βiBetween relation function method, i.e., it is right respectively experimentally to measure one group of granule density β
The voltage signal h answered, and relation function f () between the two is obtained out by the method for curve matching, belong to this field
Routine techniques can refer to pertinent literature in detail:Zhang H, Johnston P M, Zhu J X, et al.A novel
calibration procedure for a fiber optic solids concentration probe[J].Powder
Technology, 1998,100 (2-3):260-272. (a kind of novel calibration process of optical fiber solid particle probe).
The particle flow parameter further includes particle speed, and particle speed is:
Two channels of probe are arranged in the upstream and downstream in particle flow direction, and the signal detected is put through overmodulated circuit
After big filtering, the upstream and downstream signal of powder flowing at any time is collected by data acquisition circuit:X (t) and y (t), mutually
Function is closed to be represented by:
Wherein, R (τ) is the cross-correlation function of x (t) and y (t), and τ is delay time, and T is the signal period;Cross-correlation function
Delay time corresponding to maximum value is τ0, then the particle speed v of fibre-optical probe measured zone be:
V=L/ τ0 (5)
In formula, L is the axially spaced-apart of upstream and downstream optical channel.
The particle flow parameter further includes grain flux, particle mass flow rate QM:
Wherein, A is the area in particle flow section, and ρ is the density of particle.
A method of measuring granule density, which is characterized in that
Two channel detections of probe are converted into particle rear orientation light and the reference light separated through photodiode
Electric signal, and after being handled by modulation circuit, the signal sequence x (t) changed over time is collected by data acquisition circuit respectively,
Y (t), I (t);Wherein x (t) is the signal sequence in channel one, and y (t) is the signal sequence in channel two, and I (t) is the letter of reference light
Number sequence;C1, C2Respectively x (t) and the values of y (t) at a time, I0For the reference light value at I (t) moment;
By reference light I0As benchmark, the Particle Concentration Signals of output indicate as follows:
In formula, i=1,2;
Step 2: being calculate by the following formula out the local concentration β of pipeline section particle1, β2And mean concentration
βi=f (hi) (2)
In formula, f () is the h demarcatediWith βiBetween relation function, determined by experimental calibration.
A method of measuring particle speed, which is characterized in that
Two channel detections of probe are converted into particle rear orientation light and the reference light separated through photodiode
Electric signal, and after being handled by modulation circuit, the signal sequence x (t) changed over time is collected by data acquisition circuit respectively,
Y (t), I (t));Wherein x (t) is the signal sequence in channel one, and y (t) is the signal sequence in channel two, and I (t) is the letter of reference light
Number sequence;C1, C2Respectively x (t) and the values of y (t) at a time, I0For I (t)) the reference light value at the moment;
By reference light I0As benchmark, the Particle Concentration Signals of output indicate as follows:
In formula, i=1,2;
It is calculate by the following formula out the local concentration β of pipeline section particle1, β2And mean concentration
βi=f (hi) (2)
In formula, f () is the h demarcatediWith βiBetween relation function, determined by experimental calibration;
The signal that two channel detections of probe arrive is acquired after overmodulated circuit amplification filtering by data acquisition circuit
To the upstream and downstream signal x (t) and y (t) of powder flowing, cross-correlation function is represented by:
Wherein, R (τ) is the cross-correlation function of x (t) and y (t), and τ is delay time, and T is the signal period;Cross-correlation function
Delay time corresponding to maximum value is τ0, then the particle speed v of fibre-optical probe measured zone be:
V=L/ τ0 (5)
In formula, L is the axially spaced-apart of upstream and downstream light people having a common goal.
A method of measuring particle mass flow rate, which is characterized in that
Two channel detections of probe are converted into particle rear orientation light and the reference light separated through photodiode
Electric signal, and after being handled by modulation circuit, the signal sequence x (t) changed over time is collected by data acquisition circuit respectively,
Y (t), I (t);Wherein x (t) is the signal sequence in channel one, and y (t) is the signal sequence in channel two, and I (t) is the letter of reference light
Number sequence;C1, C2Respectively x (t) and the values of y (t) at a time, I0For the reference light value at I (t) moment;
By reference light I0As benchmark, the Particle Concentration Signals of output indicate as follows:
I=1,2;
It is calculate by the following formula out the local concentration β of pipeline section particle1, β2And mean concentration
βi=f (hi) (2)
In formula, f () is the h demarcatediWith βiBetween relation function, determined by experimental calibration;
The signal that two channel detections of probe arrive is acquired after overmodulated circuit amplification filtering by data acquisition circuit
To the upstream and downstream signal x (t) and y (t) of powder flowing, cross-correlation function is represented by:
Wherein, R (τ) is the cross-correlation function of x (t) and y (t), and τ is delay time.Corresponding to cross-correlation function maximum value
Delay time be τ0, then the particle speed v of fibre-optical probe measured zone be:
V=L/ τ0 (5)
In formula, L is the axially spaced-apart of upstream and downstream light people having a common goal;
Granule partial mean concentration is calculatedAfter powder flow rate v, particle mass flow rate can be calculated according to the following formula
QM:
Wherein A is the area in particle flow section, and ρ is the density of particle.
The present invention a kind of particle flow parameter measuring apparatus and method based on laser backscatter method, have reliability
High and low cost, it is safe the advantages that, and can realize non-contact forecasting, be suitable for severe industry spot condition.It thinks substantially
Lu Shi:The laser that single laser is sent out is uniformly divided into three tunnels using one point of three fiber optic bundle first, wherein two-way is used as two
In addition the measurement in channel is drawn all the way as with reference to light.The scattered light signal that two Measurement channels obtain is using reference light as ginseng
According to obtaining the mean concentration of particle by the method for experimental calibration;Secondly computing cross-correlation is done to the signal in two channels to obtain
Take the flowing velocity of particle.To realize the integrated measuring of Particle Velocity, concentration, flow.Improve laser method flowing
The precision and stability of particle sizing.
The transmission of the incident light and scattering light of measuring device of the present invention is completed in closed fiber optic bundle, optical energy loss
Small, there is no the optical centering problems in lens barrel, optical apparatus.Meanwhile fiber optic bundle can arbitrarily be bent come cooperating equipment structure and
Industry spot.
Each channel of fibre-optical probe is all made of the fiber optic bundles of inside and outside coil structures and is coupled with GRIN Lens in device.
Advantageous effect:
Compared with prior art, the invention has the advantages that:Using the design of single laser branch, two-way measurement is separated
Reference light is drawn while light, effectively reduces the unstable and system drifting of laser system;Measuring system is right in structure
Particle flow parameter measurement belongs to contactless measurement without influence, has the characteristics that experimental provision is simple, reliable, practical;
GRIN Lens is coordinated using fiber optic bundle in optical system, while laser and scattering light are completed in closed optical fiber, are had
Higher optical efficiency.
Description of the drawings
Fig. 1 is laser backscatter method particle flow parameter measurement system flow chart;
Fig. 2 is laser backscatter method particle flow parameter measuring apparatus schematic diagram;
Fig. 3 is that the optical fiber used in probe passes beam arrangement schematic diagram;
Fig. 4 is the end view of Fig. 3;
Fig. 5 is probe distal end structural schematic diagram;
Fig. 6 is the end view of Fig. 5.
Wherein, 1-635nm semiconductor lasers, 2- mono- divide three fiber optic bundles, 3- optical fiber to pass light beam, 4- GRIN Lens, 5-
Dusty space, 6- photodiodes;7- modulation circuits, 8- air blasting passages mouth, 9- computers, 10-USB interfaces, 11- candidate particles
Group;The outer rings 12- fiber optic bundle, 13- metals isolated tube, 14- inner rings fiber optic bundle, the outer rings 15- fiber optic bundle tail optical fiber, 16- inner ring fiber optic bundles
Tail optical fiber, 17-V shape blowing mouths;18- air intake passages.
Specific implementation mode
Below in conjunction with the accompanying drawings, it elaborates to the present invention:
A kind of particle flow parameter measuring apparatus based on laser backscatter method of the present invention, as shown in Figure 1 and Figure 2, packet
It includes:
Device for measuring particle flow parameter includes 1, one point of three fiber optic bundle 2 of 635nm semiconductor lasers, optical fiber biography
Light beam 3, GRIN Lens 4, dusty space 5, photodiode 6, modulation circuit plate 7, soot blower 8 and computer 9.Wherein
Soot blower 8 and computer 9 are external equipments, and other equipment is enclosed in a tube structure.As shown in Fig. 2, front end is light
Learn probe;Rear end is cabinet, and system power supply, laser generation, opto-electronic conversion, Signal sampling and processing are all partially completed at this.
Probe is the core of optical system, is illustrated in figure 2 the structure diagram of probe, internal optical element of popping one's head in
It is encapsulated in stainless steel cylinder body case.Distribution is disposed with GRIN Lens there are two optical window on window on probe tip face
To realize two-way optical coupling.
Laser and transmission of stray light between probe and cabinet pass light beam by two optical fiber and realize.In order to keep system whole
Optical property and mechanical dimension reach requirement, optical fiber in system, which passes light beam 3, has size and special construction, such as Fig. 3, figure
Shown in 4.Optical fiber passes light beam and is made of inner ring fiber optic bundle 14, outer ring fiber optic bundle 12 and metal isolated tube 13.
The compressed air of dried and clean is sent into probe distal end by soot blower system via air blasting passage mouth 8 and air blasting passage 18.
As shown in Figure 5 and Figure 6, wherein arrow direction is gas flow direction.In order to keep outlet pressure uniform, air blasting passage is horizontally disposed
In the middle part of probe, uniformly dried to the camera lens on both sides by the V-type gas outlet on probe tip face.To prevent dust adhesion, protect
Demonstrate,prove the precision of optical measurement.
Particle flow parameter can be measured using the measuring device of the present invention, wherein particle flow parameter includes
Grain concentration, particle speed and particle mass flow rate.
Particle flow measurement method of parameters based on laser backscatter method, step include as follows:
1) first, laser sends out laser and is divided into three tunnels by one point of three fiber optic bundle, two channel detections of probe to
Grain rear orientation light and the reference light that separates, electric signal is converted into through photodiode, and after being handled by modulation circuit, point
The signal sequence x (t) changed over time, y (t), I (t) are not collected by data acquisition circuit;Wherein x (t) is the letter in channel one
Number sequence, y (t) are the signal sequence in channel two, and I (t) is the signal sequence of reference light;C1, C2Respectively x (t) and y (t) are at certain
The value at one moment, I0For I (t)) the reference light value at the moment;
In order to reduce the unstable influence of laser works, by reference light I0As benchmark, collected granule density letter
Number expression is as follows:
I=1,2;
2) it is calculate by the following formula out the local concentration β of pipeline section particle1,β2And mean concentration
βi=f (hi) (2)
In formula, f () is the h demarcatediWith βiBetween relation function, determined by experimental calibration.
3) signal that two channel detections of probe arrive is acquired after overmodulated circuit amplification filtering by data acquisition circuit
The upstream and downstream signal x (t) and y (t) of particle flow are obtained, cross-correlation function is represented by:
Wherein, R (τ) is the cross-correlation function of x (t) and y (t), and τ is delay time.Corresponding to cross-correlation function maximum value
Delay time be τ0.The axially spaced-apart of known upstream and downstream light people having a common goal is L, then the particle speed v of fibre-optical probe measured zone is:
V=L/ τ0 (5)
4) granule partial mean concentration is calculatedAfter particle flow velocity v, granular mass stream can be calculated according to the following formula
Measure QM:
Wherein A is the area in particle flow section, and ρ is the density of particle.
5) as shown in Fig. 2, system is equipped with soot blower, clean compressed air passes through the soot blowing gas pipeline among cylinder
Probe distal end is reached, V-type gas outlet 17 as shown in Figure 4 is blown to the optical window on both sides, prevents window surface dust from sticking.
The present invention is reduced using fiber optic bundle as the medium of incident light and scattering light conduction in traditional optical measuring apparatus
Optical element quantity, centering is difficult and the loss of luminous energy transmission, increase the measurement distance of device.Meanwhile laser is sent out
Light be divided evenly into three tunnels through one point of three fiber optic bundle, wherein all the way draw as refer to light, eliminate laser works not
Negative effect of the stability to measurement result.The utilization of GRIN Lens and Internal and external cycle fiber optic bundle plays two-way optical coupling
Effect increases the acquisition intensity of scattering light, substantially increases the efficiency of system entirety while reducing probe size.By light
The optical signal that electric coupler captures can be transferred in computer and analyze calculating in real time, online.Meanwhile blowing device
Can constantly to optical window clean, ensure that equipment can in the environment of high dirt long-term steady operation.
Claims (9)
1. a kind of particle flow parameter measuring apparatus based on laser backscatter method, which is characterized in that including:
One fibre-optical probe sends out the laser for being irradiated to soot region and acquires the scattering light of soot region, including:Laser
Device, one point of three fiber optic bundle, optical fiber pass light beam and GRIN Lens;The laser sends out beam of laser;One point of three light
A branch of measurement laser is divided into reference light to fine beam and two beams measure light;The optical fiber passes light beam and is used for transmission the measurement light
And the rear orientation light of particle;The GRIN Lens carries out two-way optical coupling to the measurement light and scattering light;
The optical signal of the reference light and scattering light is converted to electric signal by one photoelectric switching circuit;
The particle flow parameter of soot region is calculated according to the electric signal that power conversion circuit obtains for one computer.
2. particle flow parameter measuring apparatus according to claim 1, which is characterized in that optical fiber passes light beam by inner ring optical fiber
Beam, outer ring fiber optic bundle and the metal isolated tube composition between inner ring fiber optic bundle and outer ring fiber optic bundle;Inner ring fiber optic bundle is used for
The rear orientation light of particle is collected and transmits, outer ring fiber optic bundle is used for transmission measurement light.
3. particle flow parameter measuring apparatus according to claim 2, which is characterized in that passed in light beam also in the optical fiber
Be provided with air intake passage, passing light beam end in the optical fiber is additionally provided with out vane, it is described go out vane side on be provided with V-arrangement
Blowing mouth, the V-arrangement blowing mouth are connected to the air intake passage.
4. according to any particle flow parameter measuring apparatus of claim 1-3, which is characterized in that the particle flow ginseng
Number includes granule density, and granule density is:
Two channel detections of probe are converted into telecommunications to particle rear orientation light and the reference light separated through photodiode
Number, and after being handled by modulation circuit, the signal sequence x (t) changed over time, y are collected by data acquisition circuit respectively
(t), I (t);Wherein x (t) is the signal sequence in channel one, and y (t) is the signal sequence in channel two, and I (t) is the signal of reference light
Sequence;C1, C2Respectively x (t) and the values of y (t) at a time, I0For I (t) values at the moment;
By moment reference light I0As benchmark, collected Particle Concentration Signals indicate as follows:
In formula, i=1,2;
Step 2: being calculate by the following formula out the local concentration β of pipeline section particle1,β2And mean concentration
βi=f (hi) (2)
In formula, f () is the h demarcatediWith βiBetween relation function, determined by experimental calibration.
5. particle flow parameter measuring apparatus according to claim 4, which is characterized in that the particle flow parameter is also wrapped
Particle speed is included, particle speed is:
Two channels of probe are arranged in the upstream and downstream in particle flow direction, and the signal detected amplifies through overmodulated circuit to be filtered
After wave, the upstream and downstream signal of powder flowing at any time is collected by data acquisition circuit:X (t) and y (t), cross-correlation letter
Number is represented by:
Wherein, R (τ) is the cross-correlation function of x (t) and y (t), and τ is delay time, and T is the signal period;Cross-correlation function is maximum
Value corresponding delay time is τ0, then the particle speed v of fibre-optical probe measured zone be:
V=L/ τ0 (5)
In formula, L is the axially spaced-apart of upstream and downstream optical channel.
6. particle flow parameter measuring apparatus according to claim 5, which is characterized in that the particle flow parameter is also wrapped
Include grain flux, particle mass flow rate QM:
Wherein, A is the area in particle flow section, and ρ is the density of particle.
7. a kind of method measuring granule density based on any particle flow parameter measuring apparatus of claim 1-6, feature exist
In two channel detections of probe are converted into telecommunications to particle rear orientation light and the reference light separated through photodiode
Number, and after being handled by modulation circuit, the signal sequence x (t) changed over time, y are collected by data acquisition circuit respectively
(t), I (t);Wherein x (t) is the signal sequence in channel one, and y (t) is the signal sequence in channel two, and I (t) is the signal of reference light
Sequence;C1, C2Respectively x (t) and the values of y (t) at a time, I0For the reference light value at I (t) moment;
By reference light I0As benchmark, the Particle Concentration Signals of output indicate as follows:
In formula, i=1,2;
Step 2: being calculate by the following formula out the local concentration β of pipeline section particle1, β2And mean concentration
βi=f (hi) (2)
In formula, f () is the h demarcatediWith βiBetween relation function, determined by experimental calibration.
8. a kind of method measuring particle speed based on any particle flow parameter measuring apparatus of claim 1-6, feature exist
In,
Two channel detections of probe are converted into telecommunications to particle rear orientation light and the reference light separated through photodiode
Number, and after being handled by modulation circuit, the signal sequence x (t) changed over time, y are collected by data acquisition circuit respectively
(t), I (t);Wherein x (t) is the signal sequence in channel one, and y (t) is the signal sequence in channel two, and I (t) is the signal of reference light
Sequence;C1, C2Respectively x (t) and the values of y (t) at a time, I0For the reference light value at I (t) moment;
By reference light I0As benchmark, the Particle Concentration Signals of output indicate as follows:
In formula, i=1,2;
It is calculate by the following formula out the local concentration β of pipeline section particle1, β2And mean concentration
βi=f (hi) (2)
In formula, f () is the h demarcatediWith βiBetween relation function, determined by experimental calibration;
The signal that two channel detections of probe arrive collects powder after overmodulated circuit amplification filtering by data acquisition circuit
The upstream and downstream signal x (t) and y (t) of body flowing, cross-correlation function are represented by:
Wherein, R (τ) is the cross-correlation function of x (t) and y (t), and τ is delay time, and T is the signal period;Cross-correlation function is maximum
Value corresponding delay time is τ0, then the particle speed v of fibre-optical probe measured zone be:
V=L/ τ0 (5)
In formula, L is the axially spaced-apart of upstream and downstream light people having a common goal.
9. a kind of method measuring particle mass flow rate based on any particle flow parameter measuring apparatus of claim 1-6, special
Sign is,
Two channel detections of probe are converted into telecommunications to particle rear orientation light and the reference light separated through photodiode
Number, and after being handled by modulation circuit, the signal sequence x (t) changed over time, y are collected by data acquisition circuit respectively
(t), I (t);Wherein x (t) is the signal sequence in channel one, and y (t) is the signal sequence in channel two, and I (t) is the signal of reference light
Sequence;C1, C2Respectively x (t) and the values of y (t) at a time, I0For the reference light value at I (t) moment;
By reference light I0As benchmark, the Particle Concentration Signals of output indicate as follows:
I=1,2;
It is calculate by the following formula out the local concentration β of pipeline section particle1, β2And mean concentration
βi=f (hi) (2)
In formula, f () is the h demarcatediWith βiBetween relation function, determined by experimental calibration;
The signal that two channel detections of probe arrive collects powder after overmodulated circuit amplification filtering by data acquisition circuit
The upstream and downstream signal x (t) and y (t) of body flowing, cross-correlation function are represented by:
Wherein, R (τ) is the cross-correlation function of x (t) and y (t), and τ is delay time.Prolonging corresponding to cross-correlation function maximum value
The slow time is τ0, then the particle speed v of fibre-optical probe measured zone be:
V=L/ τ0 (5)
In formula, L is the axially spaced-apart of upstream and downstream light people having a common goal;
Granule partial mean concentration is calculatedAfter powder flow rate v, particle mass flow rate Q can be calculated according to the following formulaM:
Wherein A is the area in particle flow section, and ρ is the density of particle.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109554292A (en) * | 2019-01-28 | 2019-04-02 | 长沙爱扬医药科技有限公司 | Manifold Light Way device and microorganism high-pass culture and detection device |
| CN112285165A (en) * | 2020-10-23 | 2021-01-29 | 天津大学 | Calibration system for flow velocity and concentration of pipeline multiphase flow based on electrical chromatography technology |
| CN112326519A (en) * | 2020-10-15 | 2021-02-05 | 上海北分科技股份有限公司 | Detection method and detection device of laser scattering dust meter |
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