CN107064240A - A kind of on-line monitoring system based on dielectric property dynamic change - Google Patents
A kind of on-line monitoring system based on dielectric property dynamic change Download PDFInfo
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- CN107064240A CN107064240A CN201710231401.1A CN201710231401A CN107064240A CN 107064240 A CN107064240 A CN 107064240A CN 201710231401 A CN201710231401 A CN 201710231401A CN 107064240 A CN107064240 A CN 107064240A
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- moisture
- dielectric
- loss factor
- dielectric loss
- temperature
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/221—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance by investigating the dielectric properties
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2617—Measuring dielectric properties, e.g. constants
- G01R27/2623—Measuring-systems or electronic circuits
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2688—Measuring quality factor or dielectric loss, e.g. loss angle, or power factor
- G01R27/2694—Measuring dielectric loss, e.g. loss angle, loss factor or power factor
Abstract
The present invention relates to a kind of on-line monitoring system based on dielectric property dynamic change, pass through pre-entering come the real-time on-line checking for monitoring material dielectric property dynamic change value, carrying out dielectric property dynamic change for mathematical modeling.Its whole process is：Dielectric constant, dielectric loss factor and the moisture and the numerical relationship model of Temperature Distribution of material, set up the Mathematic Model Library that dielectric constant and dielectric loss factor change with temperature and moisture first under input certain frequency；By on-line real time monitoring moisture and temperature, the dynamic change value of on-line monitoring process intermediary electrical characteristics is realized.
Description
Technical field
The invention belongs to the on-line monitoring technique field in microwave processing process.It is related to a kind of based on dielectric property dynamically change
The online monitoring system of change, the system can reflect the dynamic change of material indices in real time, so that instead by on-line monitoring
Answer the carry out degree of microwave processing process.
Background technology
In recent years, the monitoring in the world to dielectric property has had some researchs, and domestic correlative study also increases year by year.
For example parallel-plate electrode technology is widely used in the detection of agricultural product raw material physical and chemical index, because precision is high, fast and easy and
The characteristics of with non-destructive and see it is many research report.Can be to electrical parameter such as impedance Z, equivalent capacity C, the product of raw-food material
Quality factor Q, permittivity ε etc. detected, for its physicochemical property, physiological status, quality assessment.
In terms of patent, patent (Publication No. CN104885243A) discloses self-inductance measurement dielectric elastomeric body device, and it is sent out
The bright circuit system and method provided for dielectric elastomeric body device (DED) self-inductance measurement.Patent (Publication No.
CN201060237 the capacitance pool for surveying pulverized specimen dielectric constant) is disclosed.Patent (Publication No. CN102393490A) is disclosed
A kind of dielectric materials high-temperature complex dielectric constant measurement apparatus.Patent (Publication No. CN105158578A) discloses a kind of based on electricity
Bridge method measures organism dielectric constant device.
On-line monitoring is the hot issue studied in recent years.Domestic and international each major company and research institution have developed based on light
The on-line monitoring sensor of the various physical principles such as nanofarads, electromagnetic method, infrared method, ray method, image-recognizing method and method.But
It is, the sensor that these on-line monitoring techniques are used, it is most complicated, complex operation, expensive.
The present invention proposes a kind of on-line monitoring system based on dielectric property dynamic change, it is therefore intended that
The dielectric property dynamic change of online, effective, fast slowdown monitoring material is realized, monitoring material is in microwave action mistake in real time
Moisture and profiling temperatures in journey.Compared to existing monitoring method, the present invention can be used for applied widely
A variety of on-line monitoring fields such as drying sterilizing, compensate for the deficiency of conventional equipment, and simple in construction, easy to operate, price is closed
Reason.
The content of the invention
In view of the above-mentioned problems existing in the prior art, the applicant is existed there is provided a kind of based on dielectric property dynamic change
Line monitoring system.The system can obtain dielectric loss factor and entirely doing by detecting the moisture and temperature change value of material
With time T variation rule curve during dry.
A kind of on-line monitoring system based on dielectric property dynamic change, the system includes microwave operational module, industry
Computer data library module, neural network identification module, data acquisition module；The control system utilizes Jie of raw material to be dried
The electrical loss factor and dielectric constant monitor the drying process of microwave.
The dielectric property of raw material to be dried is determined with dried material temperature and the changing value of moisture with Network Analyzer,
Data processing is carried out in industrial computer database module, dielectric property i.e. dielectric loss factor and the water by dry feedstock is obtained
Divide the mathematical modeling with temperature relation；The moisture refers to the weight and material to be dried gross weight of the water in material to be dried
Percentage.
The control system is come using obtained mathematical modeling, the i.e. changing value of dielectric loss factor and dielectric constant
Control the power of microwave and the action time of microwave drying.
Dielectric loss factor with being by the detection method of the moisture of dry feedstock and the mathematical modeling of temperature relation：Fixed frequency
Rate is respectively industrial microwave frequency i.e. 915MHz and domestic microwave frequency i.e. 2450MHz, is set using Network Analyzer coaxial cable
Under the conditions of under the standby different in moisture for determining material, the dielectric loss factor varied with temperature；
Using moisture content, temperature as independent variable, with dielectric loss factor ε " for dependent variable, test data is carried out using software
Binary regression is fitted, and is respectively obtained in the case where frequency is 915MHz and 2450MHz, dielectric loss ε " and moisture, the temperature of material are
The mathematical modeling of major influence factors is fitting formula；
The dielectric loss factor of the pending raw material is with moisture and the secondary mathematical modeling of Temperature Distribution：
ε'2450=A1+B1w+C1t-D1w2+E1t2-F1wt
ε'915=A2+B2w+C2t-D2w2+E2t2-F2wt
ε″2450=A3+B3w+C3t-D3w2+E3t2-F3wt
ε″915=A4+B4w+C4t-D4w2+E4t2-F4wt
The A1、B1、C1、D1、E1、F1It is pending raw material in the change in dielectric constant coefficient that frequency is 2450MHz；A2、
B2、C2、D2、E2、F2It is pending raw material in the change in dielectric constant coefficient that frequency is 915MHz；A3、B3、C3、D3、E3、F3It is to treat
Raw material is handled in the dielectric loss factor variation coefficient that frequency is 2450MHz；A4、B4、C4、D4、E4、F4It is pending raw material in frequency
Rate is 915MHz dielectric loss factor variation coefficient；Different pending raw materials, which needs to test in advance to determine and analyze, to be situated between
Electric constant variation coefficient and dielectric loss factor variation coefficient；W is the moisture of dry feedstock, and t is temperature
The mathematical modeling entering computer database mould that dielectric constant and dielectric loss factor are changed with temperature and moisture
After block, start the moisture and temperature of continuous detection material in microwave operational program, processing procedure, by material moisture and the number of temperature
Value is input in mathematical modeling, and calculating obtains dielectric constant, the dielectric loss factor changing rule with time T in whole process
Curve.
The method of the moisture of continuous detection material is the real-time weight by the material of data collecting module collected, by meter
Calculate, the real-time moisture of obtained material in the drying process.
Wherein, the output end of microwave operational module is connected with the data acquisition channel of electronic scale and fibre optical sensor, data
Acquisition module output end Connection Neural Network recognizes module input, neural network identification module output end and microwave operational module
Input is connected.
By Network Analyzer and coaxial cable technology test different water cut and at a temperature of material dielectric constant and Jie
The electrical loss factor, fixed frequency is 915MHz (industrial) and 2450MHz (family expenses), obtains dielectric constant under two kinds of microwave frequencies
With the sub- factor of dielectric loss with temperature and the secondary math equation of moisture, and the advance input different batches in industrial computer,
The dielectric constants of the materials such as the fruits and vegetables and medicinal material of kind, dielectric loss factor respectively with temperature and the numerical relationship model of moisture.
The present invention remarkable advantage be：
1st, the dielectric property dynamic change of online, effective, fast slowdown monitoring material can be realized, monitoring material is in microwave in real time
Moisture and profiling temperatures in mechanism.
2nd, it is applied widely, it can be used for a variety of on-line monitoring fields such as drying sterilizing, compensate for conventional equipment not
Foot.
3rd, dielectric property monitoring is a kind of brand-new, quick, advanced, feasible technological means, the number obtained with the method
It is more credible according to more precisely.
The present invention limitation be：Preliminary experiment is carried out, basic data is obtained.
Brief description of the drawings
Fig. 1：A kind of on-line monitoring system schematic diagram based on dielectric property dynamic change
Fig. 2：A kind of on-line monitoring system workflow diagram based on dielectric property dynamic change
Embodiment：
Below with reference to each embodiment shown in the drawings, the present invention will be described in detail.But these embodiments are not
The limitation present invention, structure that one of ordinary skill in the art is made according to these embodiments, method or change functionally
Change and be all contained in protection scope of the present invention.
Technical scheme is elaborated with reference to accompanying drawing.Fig. 1 is a kind of based on the online of dielectric property dynamic change
Monitoring system structured flowchart, including with lower module:
1st, microwave treatment module
Different materials is subjected to microwave treatment.Including handling the micro-wave oven of material, depositing the container of material sample.
2nd, industrial computer database module
Numerical relationship model by the dielectric constant and dielectric loss factor of different materials respectively with temperature and moisture is defeated
Enter in computer, form Mathematic Model Library in computer systems.
3rd, data acquisition module
By acquisition channel, the temperature gathered in real time and water uptake kinetics value are fed back in computer, by calling number
Data calculating analysis, which is carried out, according to model library obtains dielectric constant and dielectric loss factor in real time.
4th, neural network identification module
Data transfer after processing is modeled to neural network identifier by neural network identifier.Set up dielectric normal
Number and dielectric loss factor and the image of temperature moisture.
A kind of on-line monitoring system based on dielectric property dynamic change, fibre optical sensor is placed with micro-wave oven, is passed through
The change of temperature during sensor collection microwave action, while electronic scale can reflect the change of moisture content, feeds back in computer, leads to
Dielectric constant, the dielectric loss factor dynamic change value of computer output are crossed, is monitored in real time.
Different batches, the fruits and vegetables of kind and medicinal material have the mould of corresponding dielectric property and temperature and water relation
Type, before the material that microwave action is chosen, will input the mathematical modeling of material in advance.
Embodiment 1：Illustrate concrete operation step step by taking the Radix Astragali as an example：
(1) under conditions of being determined using Network Analyzer plumbing under the different in moisture of the Radix Astragali, vary with temperature
The dielectric loss factor of (fixed frequency is 2450MHz).Using moisture content, temperature as independent variable, with dielectric loss factor ε " be because
Variable, binary regression fitting is carried out using software to test data, obtains the dielectric loss ε " of the Radix Astragali in the case where frequency is 2450MHz
With moisture content, the mathematical modeling that temperature is major influence factors：
ε′2450=29.32+0.2827w+0.1586t+0.0032w2-0.0008t2-0.0036wt
ε″2450=20.4901-0.0053w+0.0459t-0.0021w2-0.000031t2+0.0004wt
(2) in advance in industrial computer input the Radix Astragali dielectric loss factor respectively with temperature and the mathematical relationship of moisture
Model.
(3) acquisition channel gathers microwave action time, temperature and moisture in microwave processing process in real time, and dielectric is monitored in real time
The dynamic change value of constant, dielectric loss factor.
(4) traditional on-line monitoring system is used, the time is longer, narrow application range, the data precision be not high.The system energy
The dielectric property dynamic change of online, effective, fast slowdown monitoring material is enough realized, monitoring material is during microwave action in real time
Moisture and profiling temperatures；It is applied widely, it can be used for a variety of on-line monitoring fields such as drying sterilizing, compensate in the past
The deficiency of equipment, is a kind of brand-new, quick, advanced, feasible technological means, and the data obtained with the method are more accurate, more
It is credible.
Embodiment 2：Illustrate concrete operation step step by taking ginkgo nut as an example：
(1) under conditions of being determined using Network Analyzer plumbing under the different in moisture of ginkgo nut, become with temperature
Change the dielectric loss factor of (fixed frequency is 915MHz).Using moisture content, temperature as independent variable, with dielectric loss factor ε " be because
Variable, binary regression fitting is carried out using software to test data, obtains the dielectric loss of the ginkgo nut in the case where frequency is 915MHz
ε " and moisture content, the mathematical modeling that temperature is major influence factors：
ε'915=41.5351+0.1023w+0.1012t+0.0042w2-0.0003t2-0.0039wt
ε″915=22.3817+0.0829w+0.1478t-0.0023w2+0.0007t2-0.0014wt
(2) mathematics of the dielectric loss factor of ginkgo nut respectively with temperature and moisture is inputted in industrial computer in advance to close
It is model.
(3) acquisition channel gathers microwave action time, temperature and moisture in microwave processing process in real time, and dielectric is monitored in real time
The dynamic change value of constant, dielectric loss factor
(4) (4) use traditional on-line monitoring system, and the time is longer, narrow application range, the data precision be not high.This is
System can realize the dielectric property dynamic change of online, effective, fast slowdown monitoring material, and monitoring material is in microwave action process in real time
In moisture and profiling temperatures；It is applied widely, it can be used for a variety of on-line monitoring fields such as drying sterilizing, compensate for
The deficiency of conventional equipment, is a kind of brand-new, quick, advanced, feasible technological means, the data obtained with the method are more smart
Standard, it is more credible.
Claims (6)
1. a kind of on-line monitoring system based on dielectric property dynamic change, the system includes microwave operational module, industry and calculated
Machine database module, neural network identification module, data acquisition module；Described microwave on-line monitoring system, it is characterised in that：
Dielectric property is mainly characterized by dielectric constant and dielectric loss factor.Monitor material dielectric property in real time in the course of the work
Dynamic change.
2. the preparation method of dielectric loss factor according to claim 1 and dielectric constant, it is characterised in that:Utilize collection
The changing value of module collection temperature and moisture, industrial computer database module carry out data processing, by database
The dielectric property of input obtains dielectric loss factor, the changing value of dielectric constant with moisture, the mathematical modeling of Temperature Distribution, realizes
On-line monitoring.The moisture refers to the weight of the water in material to be dried and the percentage of material to be dried gross weight.
3. control system according to claim 2, it is characterised in that：The control system utilizes obtained mathematical modulo
The changing value of type, i.e. dielectric loss factor and dielectric constant controls the power of microwave and the action time of microwave drying.
4. control system according to claim 2, it is characterised in that：Dielectric loss factor and the water by microwave treatment raw material
Point it is with the detection method of the mathematical modeling of temperature relation：Fixed frequency is respectively that industrial microwave frequency i.e. 915MHz and family expenses are micro-
Wave frequency rate is 2450MHz, under the conditions of being determined using Network Analyzer plumbing under the different in moisture of material, is become with temperature
The dielectric loss factor of change；
Using moisture content, temperature as independent variable, with dielectric loss factor ε " for dependent variable, binary is carried out to test data using software
Regression fit, is respectively obtained in the case where frequency is 915MHz and 2450MHz, and dielectric loss ε " and moisture, the temperature of material are main
The mathematical modeling of influence factor is fitting formula；
The dielectric loss factor of the pending raw material is with moisture and the secondary mathematical modeling of Temperature Distribution：
ε'2450=A1+B1w+C1t-D1w2+E1t2-F1wt
ε'915=A2+B2w+C2t-D2w2+E2t2-F2wt
ε″2450=A3+B3w+C3t-D3w2+E3t2-F3wt
ε″915=A4+B4w+C4t-D4w2+E4t2-F4wt
The A1、B1、C1、D1、E1、F1It is pending raw material in the change in dielectric constant coefficient that frequency is 2450MHz；A2、B2、C2、
D2、E2、F2It is pending raw material in the change in dielectric constant coefficient that frequency is 915MHz；A3、B3、C3、D3、E3、F3It is pending original
Expect in the dielectric loss factor variation coefficient that frequency is 2450MHz；A4、B4、C4、D4、E4、F4It is that pending raw material is in frequency
915MHz dielectric loss factor variation coefficient；Different pending raw materials, which needs to test in advance, determines and analyzes that to obtain dielectric normal
Number variation coefficient and dielectric loss factor variation coefficient；W is the moisture of dry feedstock, and t is temperature.
5. the monitoring system according to any one of claim 2~4, it is characterised in that：By dielectric loss factor with temperature and
After the mathematical modeling entering computer database module of moisture change, start and continuously detected in microwave operational program, processing procedure
The moisture and temperature of material, the numerical value of material moisture and temperature are input in dielectric loss factor mathematical modeling, calculating is obtained
Dielectric constant and dielectric loss factor in whole drying process with time T variation rule curve.
6. control system according to claim 5, it is characterised in that：The method of the moisture of continuous detection material is by data
The real-time weight of the material of acquisition module collection, by calculating, the real-time moisture of obtained material in the drying process.
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| CN108089063A (en) * | 2017-12-17 | 2018-05-29 | 江南大学 | A kind of dielectric property detection method of oil crops |
| CN108089105A (en) * | 2017-12-17 | 2018-05-29 | 江南大学 | A kind of dielectric property detection method of pine nut |
| CN108982603A (en) * | 2018-08-24 | 2018-12-11 | 西南交通大学 | A kind of test method of oil-immersed sleeve pipe dampness state |
| CN110082400A (en) * | 2019-04-26 | 2019-08-02 | 上海海洋大学 | A kind of method of content of starch in quick detection minced fillet |
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