CN107860822A - A kind of online non-invasive inspection methods of mixing quality ultrasound - Google Patents
A kind of online non-invasive inspection methods of mixing quality ultrasound Download PDFInfo
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- CN107860822A CN107860822A CN201710975345.2A CN201710975345A CN107860822A CN 107860822 A CN107860822 A CN 107860822A CN 201710975345 A CN201710975345 A CN 201710975345A CN 107860822 A CN107860822 A CN 107860822A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/02—Analysing fluids
- G01N29/032—Analysing fluids by measuring attenuation of acoustic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/11—Analysing solids by measuring attenuation of acoustic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/30—Arrangements for calibrating or comparing, e.g. with standard objects
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N2291/015—Attenuation, scattering
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention belongs to ultrasonic detecting technology field, discloses a kind of online non-invasive inspection methods of mixing quality ultrasound, comprises the following steps：In the uniform n groups ultrasonic transducer of stainless steel surrounding；Each transmitting ultrasonic transducer sends ultrasonic wave under the triggering of excitation module, and the blended side wall of container one of ultrasonic wave, container inside and another side wall are received by reception ultrasonic transducer, are then collected module collection；Pure water and correct mixture are sequentially placed into stainless steel, acquisition module records ultrasonic signal successively；Testing mixture is put into stainless steel, acquisition module records ultrasonic signal in real time；Calculate the relative damping coefficient of each group ultrasonic transducer；Local and global mixture admixture situation of change and mixing quality are judged according to single group and multigroup ultrasonic transducer relative damping coefficient.The non-intrusion type on-line checking of the mixing quality information such as the present invention achievable uniformity of mixture, uniformity, have the advantages that to be easily achieved, cost is low, response is fast.
Description
Technical field
The invention belongs to ultrasonic detecting technology field, more particularly, to a kind of online non-intrusion type of mixing quality ultrasound
Detection method.
Background technology
Solid-liquid or liquid liquid mixture are widely used in the fields such as building, food, pharmacy and Aero-Space, such as medicine slurry, are mixed
Solidifying soil, solid propellant etc..Mixing quality is the important evaluation index for reflecting final products production status, and mixing quality is examined online
Survey is one of important content for ensureing product quality and production efficiency.Such as pharmacy corporation, medicine slurry mixing quality quality will
The drug effect of finished medicines is directly influenced, partly has the uniformity of side effect composition even more important.And for solid propellant, mixing
Quality directly affects the processing characteristics, mechanical property and combustibility of solid propellant, and then influences pushing away for rocket or guided missile
Power stability.
Detection to mixture mixing quality, most of at present is in the different parts sampling progress laboratory of mixture
Analysis is tested, mixing effect is judged by a certain performance (such as combustibility) or physical attribute (density of such as sample) of slurry indirectly
Fruit, ageing extreme difference can not caused quality problems carry out real-time tracking in preparation process to mixture.It is current mixed to ensure
The mixing quality of compound, generally realized using the method for extending preparation time, but so do and not only greatly reduce production effect
Rate, and mixing quality also cannot be guaranteed.Simultaneously with the development of continuous production technology, the online inspection of mixture mixing quality
Survey turns into its essential link.Under the overall background that existing production technology and Future Technologies develop, there is an urgent need to mixed
The new method of the mixing quality on-line checking of compound.
Ultrasonic detecting technology is the technology that various detections and measurement are carried out using ultrasonic wave.Compared to the survey of other principles
Amount method such as electric induction method, image method, light scattering method etc., ultrasonic wave has strong penetration power, in optically opaque medium or height
Under concentration of particles test condition, ultrasound has obvious advantage.Contain abundant reflection material in ultrasonic signal
The information of composition, structure and property.The characteristic quantities such as material and composition difference, the velocity of sound that ultrasonic wave is propagated wherein and decay are not
Together, by analyzing the ultrasonic feature signals of different Mixed Zones, it can be determined that mixing quality.But because ultrasonic signal is with mixing matter
Relation is complicated between amount, it is difficult to directly judges mixing quality simply by ultrasonic signal, needs badly and propose for mixing quality
Ultrasonic on-line detecting method.
The content of the invention
For the disadvantages described above or Improvement requirement of prior art, non-invade the invention provides a kind of mixing quality ultrasound is online
Enter formula detection method, it is intended to overcome the problem of mixture mixing quality detection method is present in the prior art, mixed by measuring
The ultrasonic signal of the multiple positions of container is closed, the data analysis to multiple ultrasonic signals, uniformity difference, product in container is judged and lacks
The quality information such as sunken and abnormal, realize the purpose of ultrasonic quick detection mixture mixing quality.
To achieve the above object, the present invention proposes a kind of online non-invasive inspection methods of mixing quality ultrasound, and it is wrapped
Include following steps：
(1) transmitting ultrasonic transduction is included in the uniform n groups ultrasonic transducer of surrounding of stainless steel, every group of ultrasonic transducer
Device and ultrasonic transducer is received, transmitting ultrasonic transducer in every group of ultrasonic transducer and receive ultrasonic transducer with mixing appearance
The outside wall surface contact of device, and be symmetrically arranged；
(2) the transmitting ultrasonic transducer in each group ultrasonic transducer sends same frequency rate and work(under the triggering of excitation module
The ultrasonic wave of rate, ultrasonic wave pass through the stainless steel wall being in contact with transmitting ultrasonic transducer, stainless steel inside and with connecing
The stainless steel wall that ultrasonic transducer is in contact is received, is finally received by corresponding reception ultrasonic transducer, each ultrasound that receives is changed
The ultrasonic signal that energy device receives is collected module and recorded in real time；
(3) pure water is put into stainless steel, acquisition module record receives the ultrasonic signal that ultrasonic transducer receives, its
Ultrasound signal signatures value is designated as pi0, the group of i expression reception ultrasonic transducers, it is then discharged out pure water；
(4) repetition rate and power of excitation module triggering transmitting ultrasonic transducer are kept, mark is put into stainless steel
Quasi- mixture, acquisition module record receive the ultrasonic signal that ultrasonic transducer receives, and its ultrasound signal signatures value is designated as pis, so
Heel row goes out correct mixture；
(5) repetition rate and power of excitation module triggering transmitting ultrasonic transducer are kept, is put into and treats in stainless steel
Mixture is surveyed, acquisition module records in real time receives the ultrasonic signal that ultrasonic transducer receives, and its ultrasound signal signatures value is designated as
pi(t)；
(6) it is calculated as follows the relative damping coefficient α of each group ultrasonic transduceri(t)：
Wherein, liIt is i-th group of reception ultrasonic transducer and launches the distance between ultrasonic transducer, pi(t) it is acquisition module
The ultrasound signal signatures value received by i-th group of reception ultrasonic transducer of testing mixture gathered in real time, pi0It is collection
The ultrasound signal signatures value received by i-th group of reception ultrasonic transducer during pure water of module collection；
(7) detection zone according to corresponding to the relative damping coefficient judge single group ultrasonic transducer that single group ultrasonic transducer obtains
The admixture situation of change and mixing quality of mixture in domain；The relative ultrasonic attenuation system obtained according to multigroup ultrasonic transducer
Number judges the admixture situation of change and mixing quality of mixture in whole detection zone.
As it is further preferred that the relative damping coefficient obtained according to single group ultrasonic transducer judges single group ultrasonic transduction
The admixture situation of change of mixture and mixing quality are specially in detection zone corresponding to device：
(a) the admixture situation of change of mixture passes through the coefficient of stability in detection zone corresponding to single group ultrasonic transducer
γi(t) judged, its calculation expression is：
Wherein, T is to judge the cycle, coefficient of stability γi(t) value is bigger, and admixture change is fiercer；
(b) mixing quality of mixture passes through quality coefficient δ in detection zone corresponding to single group ultrasonic transduceri(t) enter
Row is judged, and its calculation expression is：
Wherein,Quality coefficient δi(t) value is smaller shows that mixing quality is better.
As it is further preferred that the relative ultrasonic attenuation coefficient obtained according to multigroup ultrasonic transducer judges whole detection
The admixture situation of change of mixture and mixing quality are specially in region：
(a) the mixed stability property coefficient σ that the admixture situation of change of mixture passes through the overall situation in whole detection zoneγ
(t) judged, its calculation expression is：
Wherein,σγ(t) admixture in the smaller whole detection zone of explanation of value more becomes
In stable；
(b) the mixing quality factor sigma that the mixing quality of mixture passes through the overall situation in whole detection zoneδ(t) judged,
Its calculation expression is：
Wherein, σδ(t) it is smaller to show that mixing quality is better.
In general, by the contemplated above technical scheme of the present invention compared with prior art, mainly possess following
Technological merit：
1. the present invention can realize that the non-intrusion type of the mixing quality information such as uniformity of mixture, uniformity is examined online
Survey, be the offer guidances such as industrial automation and Optimizing Process Parameters.
2. the present invention can carry out on-line checking, while detection object is extensive, can penetrate metal, plastic or other material, fits
The detection of light blocking medium is closed, contactless on-line checking can be realized.
3. present invention sensor in detection process need not move, adjustment position, with preferable stability and reliably
Property, suitable for severe industrial environment.
4. the present invention is easily achieved, cost is relatively low, response is fast, harmless, and industrial process will not be produced additional
Adverse effect.
Brief description of the drawings
Fig. 1 is a kind of flow chart of online non-invasive inspection methods of mixing quality ultrasound provided in an embodiment of the present invention；
Fig. 2 is the structural representation of detecting system provided in an embodiment of the present invention.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in each embodiment of invention described below
Conflict can is not formed each other to be mutually combined.
As shown in figure 1, a kind of online non-invasive inspection methods of mixing quality ultrasound provided in an embodiment of the present invention, it is wrapped
Include following steps：
(1) it is to arrange test device, the specifically uniform n groups ultrasonic transducer of surrounding in stainless steel first, n >=2, often
Group ultrasonic transducer includes transmitting ultrasonic transducer and receives ultrasonic transducer, and the transmitting ultrasound in every group of ultrasonic transducer is changed
Energy device and reception ultrasonic transducer contact with the outside wall surface of stainless steel, and are symmetrically arranged, i.e. every group of ultrasonic transduction
Transmitting ultrasonic transducer and reception ultrasonic transducer in device are divided into the left side and right side of stainless steel, opposite to arrange, and
In same level, with this so that by the ultrasonic signal of the transmitting ultrasonic transducer in every group just by connecing in same group
Receive ultrasonic transducer to receive, transmitting ultrasonic transducer is connected with excitation module, receives ultrasonic transducer and with acquisition module is connected, adopts
Collection module is transmitted to data analysis module after gain amplification, filtering noise reduction are carried out to ultrasonic signal, and data analysis module is to ultrasound
Signal carries out data analysis, draws mixing quality information；
(2) the transmitting ultrasonic transducer in each group ultrasonic transducer sends same frequency rate and work(under the triggering of excitation module
The ultrasonic wave of rate, ultrasonic wave passes through the stainless steel wall being in contact with transmitting ultrasonic transducer, stainless steel inside (mixes
Material region) and with receiving the stainless steel wall that is in contact of ultrasonic transducer, finally connect by corresponding reception ultrasonic transducer
Receive, the ultrasonic signal that each reception ultrasonic transducer receives is collected module and recorded in real time；
(3) pure water is put into stainless steel, acquisition module record receives the ultrasonic signal that ultrasonic transducer receives, its
Ultrasound signal signatures value is designated as pi0, the group of i expression reception ultrasonic transducers, discharge pure water；
(4) repetition rate and power of excitation module triggering transmitting ultrasonic transducer are kept, mark is put into stainless steel
Quasi- mixture, acquisition module record receive the ultrasonic signal that ultrasonic transducer receives, and its ultrasound signal signatures value is designated as pis, its
Plays mixture refers to consistent with testing mixture formula, but mixing quality has reached stable and to be optimal, discharges standard
Mixture；
(5) repetition rate and power of excitation module triggering transmitting ultrasonic transducer are kept, is put into and treats in stainless steel
Mixture is surveyed, acquisition module records in real time receives the ultrasonic signal that ultrasonic transducer receives, and its ultrasound signal signatures value is designated as
pi(t), t is the time, and wherein testing mixture can be the mixture for being stirred, being flowed in static or pipeline；
(6) data analysis module calculates the relative damping coefficient of each ultrasonic signal of acquisition module input respectively, and i-th group surpasses
The relative damping coefficient calculation expression of sonic transducer is：
Wherein, liIt is i-th group of reception ultrasonic transducer and launches the distance between ultrasonic transducer, pi(t) it is acquisition module
The ultrasound signal signatures value received by i-th group of reception ultrasonic transducer of mixture gathered in real time, pi0It is acquisition module
The ultrasound signal signatures value received by i-th group of reception ultrasonic transducer during pure water of collection；Wherein, features described above value can
To be temporal signatures variable or the ultrasonic signals such as maximum amplitude, average value, mean-square value and the root-mean-square value of ultrasonic signal
Maximum amplitude, average value, mean-square value and root-mean-square value of frequency-region signal obtained by fast Fourier change etc.；
(7) detection zone according to corresponding to the relative damping coefficient judge single group ultrasonic transducer that single group ultrasonic transducer obtains
The admixture situation of change and mixing quality of domain (i.e. regional area) interior mixture：
For i-th group of ultrasonic transducer, its relative damping coefficient changing rule reflects i-th group of ultrasonic transducer detection zone
The admixture situation of change in domain, the relative damping coefficient variation tendency of i-th group of ultrasonic transducer measured zone pass through stability series
Number is judged, and its calculation expression is：
Wherein, T is to judge the cycle, for being stirred, can use the time that blade rotates 1 circle, coefficient of stability γi(t) value
Bigger, admixture change is fiercer, as coefficient of stability γi(t) when tending to be reduced to 0, show detection zone mixing quality by
Gradually in a certain stable state；
Use the quality of the difference of relative damping coefficient and standard attenuation coefficient reflection mixing quality, i-th group of ultrasonic transduction
The quality coefficient calculation expression of device measured zone is：
Wherein, αisFor standard attenuation coefficient,δi(t) value is smaller, and mixing quality is better；
(8) the relative ultrasonic attenuation coefficient obtained according to multigroup ultrasonic transducer judges the mixing matter of whole Mixed Zone
Amount, using mean square deviation come the admixture and mixing quality of the whole Mixed Zone of Comprehensive Evaluation：
Global mixed stability property coefficient calculation expression is：
Wherein,N be whole Mixed Zone ultrasonic transducer group number, σγ(t) value is got over
It is small, illustrate that the state in whole Mixed Zone more tends towards stability, when Existence of Global Stable factor sigmaγ(t) when tending to be reduced to 0, detection zone
Domain mixing quality gradually tends to a certain stable state, now, limited to the improvement result of mixing quality by the postponement production time；
Global mixing quality coefficient calculation expression is：
Wherein, σδ(t) it is smaller, show that current mixing quality and standard quality difference are smaller, work as σδ(t) when close to 0, table
Bright mixing quality reaches expected mixed effect, and mixing terminal reaches.
Fig. 2 is the detecting system schematic diagram for carrying out the online Noninvasive testing of mixing quality ultrasound, as shown in Fig. 2
Detecting system is made up of excitation module 2, acquisition module 3, data analysis module 4, controller 5 and n group ultrasonic transducers, and every group surpasses
Sonic transducer includes receiving ultrasonic transducer 11 and transmitting ultrasonic transducer 12, launches ultrasonic transducer 12 and receives ultrasonic transduction
Device 11 is coaxially arranged in opposite directions.Wherein, encourage module 2 to be connected with transmitting ultrasonic transducer 12, transmitting ultrasound is controlled by excitation module 2
Sensor 12 sends ultrasonic signal；Acquisition module 3 is connected with receiving ultrasonic transducer 11, and acquisition module 3 is to receiving ultrasonic transduction
The ultrasonic signal that device 11 receives carries out gain, filtering and noise reduction；Data analysis module 4 is connected with acquisition module 3, receives and passes through
Ultrasonic signal after the processing of acquisition module 3, data analysis module 4 carry out analysis calculating to ultrasonic signal, obtain local and global
The coefficient of stability and quality coefficient, export to controller 5, controller 5 carries out result and shown and output.
Further, launch ultrasonic transducer 12 and receive ultrasonic transducer 11 and use broadband planar ultrasonic transducer, hair
Penetrate ultrasonic transducer 12 and receive ultrasonic transducer 11 and be connected by couplant with stainless steel outside wall surface, the arrangement is non-
The detection mode of intrusive mood, available for solid-liquid two-phase mixture uniformity in monitoring pipeline or tank diameter, and mixing is not disturbed
Process.
Further, launching ultrasonic transducer 12 and receiving ultrasonic transducer 11 can also be inserted directly into inside stainless steel,
The arrangement structure is the simplest, has that stable performance, repeatability be high, reflection loss is small in measurement process and echo-signal is strong
Spend the advantages that big.
Further, receive ultrasonic transducer 11 to may be designed as functioning simultaneously as sounding and receive ultrasonic wave energy, that is, connect
The internal loopback model of ultrasonic transducer 11 is received, cancels transmitting ultrasonic transducer 12.Ultrasonic transduction is received under excitation module triggering
Device 11 sends ultrasonic wave, after container wall and solidliquid mixture to be detected, is reflected by the container wall on opposite, and received
Ultrasonic transducer 11 receives.
During detection, excitation module 2 is sent into hair by certain repetition rate (such as 100Hz) transmitting electric pulse, electric impulse signal
Penetrate in sonac 12, and then trigger transmitting ultrasonic transducer 12 and send ultrasonic wave；Transmitting ultrasonic transducer 12 is sent super
Sound wave passes through the stainless steel wall being in contact with transmitting ultrasonic transducer 12, mixed material region, changed with receiving ultrasound successively
The stainless steel wall that energy device 11 is in contact, is received by the corresponding reception ultrasonic transducer 11 in same group；Module 2 is encouraged to each
The repetition rate and electrical pulse power of individual transmitting ultrasonic transducer are consistent, and each transmitting ultrasonic transducer 12 sends same frequency
The ultrasonic wave of rate, excitation module 2 ensure the triggered time phase of each transmitting ultrasonic transducer 12 by the synchronizing signal of controller 5
Together, in whole measurement process, keep the repetition rate of the excitation triggering transmitting transducer 12 of module 2 and power constant；It is each to connect
Ultrasonic signal difference real-time Transmission to acquisition module 3, the ultrasonic signal that ultrasonic transducer 11 receives is received to put by acquisition module 3
Greatly, transmitted after filtering and noise reduction to data analysis module 4, the running parameter of acquisition module 3 is (as amplified in whole measurement process
Multiple, filtering mode etc.) it is consistent.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, all any modification, equivalent and improvement made within the spirit and principles of the invention etc., all should be included
Within protection scope of the present invention.
Claims (3)
1. the online non-invasive inspection methods of a kind of mixing quality ultrasound, it is characterised in that comprise the following steps：
(1) in the uniform n groups ultrasonic transducer of surrounding of stainless steel, every group of ultrasonic transducer include transmitting ultrasonic transducer and
Receive ultrasonic transducer, the transmitting ultrasonic transducer and reception ultrasonic transducer in every group of ultrasonic transducer with stainless steel
Outside wall surface contacts, and is symmetrically arranged；
(2) the transmitting ultrasonic transducer in each group ultrasonic transducer sends same frequency rate and power under the triggering of excitation module
Ultrasonic wave, ultrasonic wave pass through the stainless steel wall being in contact with transmitting ultrasonic transducer, stainless steel inside and surpassed with receiving
The stainless steel wall that sonic transducer is in contact, finally received by corresponding reception ultrasonic transducer, respectively receive ultrasonic transducer
The ultrasonic signal received is collected module and recorded in real time；
(3) pure water is put into stainless steel, acquisition module record receives the ultrasonic signal that ultrasonic transducer receives, its ultrasound
Signal characteristic value is designated as pi0, the group of i expression reception ultrasonic transducers, it is then discharged out pure water；
(4) repetition rate and power of excitation module triggering transmitting ultrasonic transducer are kept, being put into standard in stainless steel mixes
Compound, acquisition module record receive the ultrasonic signal that ultrasonic transducer receives, and its ultrasound signal signatures value is designated as pis, Ran Houpai
Go out correct mixture；
(5) repetition rate and power of excitation module triggering transmitting ultrasonic transducer are kept, is put into stainless steel to be measured mixed
Compound, acquisition module records in real time receives the ultrasonic signal that ultrasonic transducer receives, and its ultrasound signal signatures value is designated as pi
(t)；
(6) it is calculated as follows the relative damping coefficient α of each group ultrasonic transduceri(t)：
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The ultrasound signal signatures value received by i-th group of reception ultrasonic transducer of testing mixture of collection, pi0It is acquisition module
The ultrasound signal signatures value received by i-th group of reception ultrasonic transducer during pure water of collection；
(7) according to corresponding to the relative damping coefficient judge single group ultrasonic transducer that single group ultrasonic transducer obtains in detection zone
The admixture situation of change and mixing quality of mixture；Commented according to the relative ultrasonic attenuation coefficient that multigroup ultrasonic transducer obtains
Sentence the admixture situation of change and mixing quality of mixture in whole detection zone.
2. the online non-invasive inspection methods of a kind of mixing quality ultrasound as claimed in claim 1, it is characterised in that according to list
The relative damping coefficient that group ultrasonic transducer obtains judges the mixing of mixture in detection zone corresponding to single group ultrasonic transducer
State change situation and mixing quality are specially：
(a) the admixture situation of change of mixture passes through coefficient of stability γ in detection zone corresponding to single group ultrasonic transduceri
(t) judged, its calculation expression is：
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(b) mixing quality of mixture passes through quality coefficient δ in detection zone corresponding to single group ultrasonic transduceri(t) commented
Sentence, its calculation expression is：
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Wherein,Quality coefficient δi(t) value is smaller shows that mixing quality is better.
3. the online non-invasive inspection methods of a kind of mixing quality ultrasound as claimed in claim 1, it is characterised in that according to more
The relative ultrasonic attenuation coefficient that group ultrasonic transducer obtains judges the admixture situation of change of mixture in whole detection zone
And mixing quality is specially：
(a) the mixed stability property coefficient σ that the admixture situation of change of mixture passes through the overall situation in whole detection zoneγ(t) enter
Row is judged, and its calculation expression is：
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Wherein,σγ(t) admixture in the smaller whole detection zone of explanation of value more tends to be steady
It is fixed；
(b) the mixing quality factor sigma that the mixing quality of mixture passes through the overall situation in whole detection zoneδ(t) judged, it is counted
Operator expression formula is：
<mrow>
<msub>
<mi>&sigma;</mi>
<mi>&delta;</mi>
</msub>
<mrow>
<mo>(</mo>
<mi>t</mi>
<mo>)</mo>
</mrow>
<mo>=</mo>
<msqrt>
<mrow>
<mfrac>
<mn>1</mn>
<mi>n</mi>
</mfrac>
<msubsup>
<mi>&Sigma;</mi>
<mrow>
<mi>i</mi>
<mo>=</mo>
<mn>1</mn>
</mrow>
<mi>n</mi>
</msubsup>
<msub>
<mi>&delta;</mi>
<mi>i</mi>
</msub>
<msup>
<mrow>
<mo>(</mo>
<mi>t</mi>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
</mrow>
</msqrt>
</mrow>
Wherein, σδ(t) it is smaller to show that mixing quality is better.
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| CN112230224A (en) * | 2020-11-09 | 2021-01-15 | 北京信息科技大学 | Ultrasonic convergence detection positioning device for magnesium alloy processing |
| CN112666250A (en) * | 2019-10-15 | 2021-04-16 | 中山大学 | Automatic measuring device and method for ultrasonic acoustic parameters of liquid |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108956781A (en) * | 2018-07-27 | 2018-12-07 | 国家海洋局第海洋研究所 | Deposit rate of sound and attenuation of sound measuring device and method |
| CN112666250A (en) * | 2019-10-15 | 2021-04-16 | 中山大学 | Automatic measuring device and method for ultrasonic acoustic parameters of liquid |
| CN111595735A (en) * | 2020-04-14 | 2020-08-28 | 江苏海宇机械有限公司 | Ultrasonic detection control method for improving powder uniformity of laser additive experiment |
| CN111595735B (en) * | 2020-04-14 | 2023-05-09 | 江苏海宇机械有限公司 | Ultrasonic detection control method for improving uniformity of laser additive experiment powder |
| CN112230224A (en) * | 2020-11-09 | 2021-01-15 | 北京信息科技大学 | Ultrasonic convergence detection positioning device for magnesium alloy processing |
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