CN108398441A - Online non-contact microwave radar Moisture Meter and its measurement method are realized - Google Patents
Online non-contact microwave radar Moisture Meter and its measurement method are realized Download PDFInfo
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- G01N22/00—Investigating or analysing materials by the use of microwaves or radio waves, i.e. electromagnetic waves with a wavelength of one millimetre or more
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Abstract
A kind of online non-contact microwave radar Moisture Meter, it is characterized in that at least but not limiting to 5 parts and forming, is shown in structure composition Fig. 1 for irregular molding static or movement blending agent real-time online moisture detection；1：Antenna module part (10), including at least a pair of of antenna (11) and (or) several to matrix antenna, RF coaxial relay, coaxial wire jumper, with pumping signal isolator (12), the acquisition of the main moisture information for completing measured point single-point or multiple spot；2：Multisensor assembly part (20), thermal module (21) for obtaining measured medium point, position module (22), thickness (23), ambient humidity (24), Media density (25) and other related sensor modules；3：Vector detection module part (30)；4：Multi-sensor Fusion part (40)；5：Moisture instrument (50) is both human-machine operation dialogue display window and the various terminations of contact with foreign countries.
Description
(1) technical field
It is to be applied to a new technology of shallow geological structure, lithology test in recent years that radar (Radar), which surveys water technology,
Feature is quick, lossless, continuous detection.Microwave radar moisture transducer theoretical, radar surveying principle according to electromagnetic wave propagation
And method determine in different medium the size of water content have in the air with it OFF signal phase and changed power it is corresponding
Relationship establishes model with this, and completes dynamic detection and the metering of media water-bearing amount size.The technology belongs to optical, mechanical and electronic integration
The mating moisture transducer and its analytical instrument instrument of Industry-oriented in field in high-performance, intelligent instrumentation.
(2) background technology
Microwave noncontact measurement belongs to the application category of low power microwave energy measuring, and basic principle is with microwave
As the medium that information is transmitted, radiation, reflection, transmission, scattering, interference, diffraction, resonance and more are had to microwave according to tested material
The physical characteristics such as Bu Le effects have the sensitive microwave moisture transducer responded to turn the non electrical quantity of object to be measured using to non electrical quantity
The variation for changing microwave electric parameter into measures.The biggest advantage is to medium can be passed through by way of space radiation for microwave
Inside, sensor can not be contacted with measured matter in measurement process, be very suitable for industrial on-line checking.For
Irregular static or moving medium moisture on-line monitoring, selects the obvious formula of microwave noncontact measurement necessary.Microwave
The precision of non-cpntact measurement is high, good reliability, strong antijamming capability, lossless, real-time, On-line rapid measurement easy to implement, again
Radiationless danger, operation and use are very safe, are applicable in the demand of industrial Internet of Things application, therefore microwave noncontact measurement has
Extremely wide application prospect.
(3) invention content
A kind of online non-contact microwave radar Moisture Meter of present invention proposition and its measurement method simultaneously realize products application.
Technical solution of the present invention：
1, a kind of online non-contact microwave radar Moisture Meter, hereinafter referred to as Moisture Meter are mainly used for irregular molding
It is static or movement blending agent real-time online moisture detection, it is characterized in that at least but do not limit to 5 part form,
See structure composition Fig. 1.1：Moisture signal acquisition part is also named in antenna module part (10), include at least a pair of of antenna (11) and
(or) several to matrix antenna, RF coaxial relay, coaxial wire jumper and pumping signal isolator (12), mainly complete measured point
The acquisition of the moisture information of single-point or multiple spot, i.e. the microwave physical parameter of output drive signal and acquisition penetrate after measured medium thoroughly
Penetrate the microwave physical parameter of loss；Output drive signal is exported by vector detection module, is sent to by radio frequency coaxial-cable wire jumper
Isolator, then RF coaxial relay is sent to by coaxial cable jumper, it is finally output to transmitting antenna, receives signal then by connecing
Antenna is received through coaxial cable jumper to RF coaxial relay, it is right then by coaxial cable jumper to vector detection module receiving terminal
Single-point detection for, direct coaxial cable jumper short circuit RF coaxial relay, complete moisture signal acquisition.2：Multisensor group
Part part (20), it is made of the thermal module (21) for obtaining measured medium point, position module multiple sensor assemblies
(22), thickness (23), ambient humidity (24), Media density (25) and other related sensor modules.3：Vector detection module
Partly (30) are made of microwave source and microwave signal process circuit, on one side by coaxial cable jumper and moisture signal acquisition part
Connection another side connect with circuit in moisture instrument, complete moisture signal acquisition process and signal excitation, by reception with
The comparison for sending microwave signal is found out and the relevant decaying size of moisture and phase size.4：Multi-sensor Fusion part (40),
Main to complete temperature, position, thickness, ambient humidity, the calibration and amendment of Media density and other relevant sensor signals are
Moisture instrument is provided, accurate signal is provided.5：Moisture instrument (50) is both human-machine operation dialogue display window and contact with foreign countries
Various terminations, include the circuits such as terminal board, measuring circuit plate, master control borad, display board and finger-board, middle-end in gauge outfit
Be also connected in addition to circuit and vector detection module part (30) and Multi-sensor Fusion part (40) connection in daughter board it is corresponding every
Quick-fried safe grid module, terminal board is external including but not limited at least 1 road power supply terminal, at least 1 tunnel pick-up leading-out terminal, until
Few 1 road communication terminal, at least 1 pair of moisture height alarm terminal etc.；A magnetic pen is also configured outside moisture instrument (50), for people
Machine operation dialogue uses.
2, the day line piece components (10) of the Moisture Meter, multisensor assembly part (20), common point is same
It works online for a long time in work condition environment, while detecting corresponding parameter, complete measurement, amendment or supplement to water parameters,
Accurate description for improving moisture analyser；Should be by pressure resistance, heatproof, acid and alkali-resistance is wear-resisting, and resistant material is constituted, when necessary
Sprayed protection crust has moisture-proof, dust-proof, the security protections such as thunder-lightning design.
3, the online immersion microwave radar Moisture Meter measurement method is with hereinafter abbreviation Moisture Meter measurement method,
It is characterized in that：It is received to by medium Excitation Electromagnetic Wave, while by antenna through dieletric reflection using one or more pairs of radar antennas
Echo, when being propagated in the medium using electromagnetic wave, path, electromagnetic field intensity and waveform by with by the electrical property of medium and
The variation of magnetic field properties, according to information such as phase of echo, the power magnitudes received, to detect medium by aqueous size shadow
Loud physical parameter simultaneously fits out the size containing water content.Its Moisture Meter measurement method is shown in Fig. 2；Its sensor real-time perception medium
Physical characteristic and pass to DSP be core signal processing circuit and fit moisture real time information and work information, moisture
Instrument is completed to overhaul positive sensor with regard to terrestrial reference by gauge outfit man machine operation interface, and the moisture value for obtaining sensor measurement is related to other
It is worth and shows；And/or communicated by the communication port and PC machine of Moisture Meter, and the pre- ICVS softwares in PC machine are to moisture
Instrument build mark and corrects, and will build in mark result storage to sensor, finally, PC machine can get sensor measurement moisture value and
Other values keep result of detection very clear, to measurement result analysis, interpretation intuitive and convenient, after postmenstruation expands application, and detection essence
It spends that higher, sampling point be closeer, working efficiency higher and the concern by every profession and trade, constantly expands in the application field of Internet of Things
Exhibition.
4, the Moisture Meter parameter phase and decaying are to be fitted into moisture by approximate true analysis.It is linearly marked
Formula (2), wherein W- moisture values are shown in definite opinion formula (1), a square calibration, A, B, C calibration coefficients, φ phases, D decaying, | φ |
Phase absolute value, | D | decaying absolute value, arg (φ) phase algebraic symbol, arg (D) decaying algebraic symbols.
W=A φ+BD+C (1)
W=A1·φ+(A2·|φ|2)·arg(φ)+B1·D+(B2·|D|2)·arg(D)+C (2)
The Moisture Meter parameter phase and decaying are to be fitted into moisture, above-mentioned formula by approximate true analysis
(1), formula (2) can be simplified to pure phase or attenuation measurement algorithm, only simply obtain phase or pad value without
Phase must be obtained simultaneously and decaying participates in operation.
5, the Moisture Meter causes measurement error big and introduces and density independent measurement to solve density unevenness
Algorithm, it is characterised in that known driving frequency F obtains wavelength X, detects phase (radian) φ, and decay D, detects medium distance d,
Media density is ρ, and α is attenuation constant, and β is phase constant, according to the relative theory and approximate condition of microwave incidence lossy dielectric,
Obtain following formula (3)：
And it finds out
In determining measurement medium kind, under the conditions of density p and frequency F
Relationship meet linear relation (4)
Slope A is calculated using least square methodfWith intercept k
Then
The ratio of the tangent value tan δ and density p that define loss angle δ are operator ξ,
Then
After simplification：
Also complex dielectric permittivity ε ' is acquiredp
εp=(ε 'p-ε”p)
Then complex dielectric permittivity ε 'pWithThere is relational expression (5)
By being found after the analysis to experimental dataWith the moisture W of medium, the approximately linear passes medium temperature T
System, sees formula (6)
Calculate constant a, b, c using least square method, according to determining parameter AfWith intercept k and a, b, c, and
The dielectric thickness d temperature T detected, phase (radian) φ, decay D, and it is unrelated with density to obtain complex dielectric permittivity through data processing
Amount operator ξ, the medium moisture W at line computation temperature T
That is formula (7)
This method is not required to the density of on-line checking medium, but derives corresponding relationship amount by off-line data, solves very well
Solid dielectric density is uneven, caused measurement error.
6, the online immersion microwave radar Moisture Meter measurement method is realized with hereinafter abbreviation Moisture Meter measurement side
Method is realized, it is characterised in that：The signal transmitting of microwave frequency band is constituted using phase-locked loop pll and auto level control ALC technologies
Device part, and receiving portion is to use superheterodyne mode；Entire circuit is formed by receiving and dispatching two parts, the new component of core be by
Circuit block transmitting-receiving phase demodulation, the amplitude discriminator of key component are embedded in entire transceiver module as a replaceable modules form
In, and the phase and amplitude measurement accuracy of vector parameters is also determined by these components, sees Fig. 3：Microwave source and signal processing electricity
Shown in the figure of road.The microwave excitation of the main scan frequency that microwave X wave bands 8-12GHZ is provided and the power adjustment of 20-30DB
Signal is completed at the same time the detection of reflected signal amplitude and phase change.
Advantage of the present invention:
Moisture Meter man-machine interface is realized with the industrial computer of standard, or industrial single board computer microcomputer system.One
Friendly user's operation catalogue can connect up to 128 measuring instruments at one in software package, by a control system
Manage device.For instrument, all test results are shown on a LCD monitor with big letter.It can at several meters
It is shown in the form of with figure, the table of display provides highly useful comparing function, for " online " observation production process
Stability.It can also be used for showing composite diagram in the no period, time interval can be from one hour to one month.Keeper or
Operator can be operated by remote control and regulation.More can by 4-20mA, RS232, RS485 or Profi-Bus in networking,
Wired or wireless teletransmission, or even support optical fiber transmission.
Mounting means is flexible:It may be mounted at different application environments, such as (nonmetallic) in pipeline, in container, funnel
And conveyer belt.Under normal circumstances, microwave moisture instrument needs to configure a non-contacting ultrasonic thickness compensation probe on medium
Side, the height change for compensating vehicle mounted material.
Application industry is extensive, is mainly used in wood industry, food service industry, paper industry, pharmaceutical industry, chemical industry,
Glass industry, power industry, petroleum industry.
It adapts to measure all lossy dielectrics：1) mineral products class, mine and metallurgy, sinter mixture, coke, coal cinder are burnt
Coal, mud coal, hot coal, coal dust, zinc ore, concentrate, copper mine, nickel minerals, aluminum sinter mine, pellet, Tu Kuang, mineral are husky, and bentonite is coloured
Metal, aluminium oxide copper, silver, lead, zinc abstraction, steel etc.；2) tobacco, cigarette packet, tobacco leaf, pipe tobacco, cigarette stem, offal etc.；3) food, breast
Junket, cream, artificial cheese, dilated food, natural cheeses, redrying, milk powder, copper meat products；4) grain processing, wheat, corn are high
Fine strain of millet, paddy product, flour, baked goods, bread, cake, biscuit, candy, granulated sugar, feed, 5) various biomass fuels, waste paper, rice
Shell, sawmilling, cotton, feed, rubbish etc..
Main feature：
1. using microwave radar Detection Techniques, do not influenced by color and work condition environment factor；
2. measuring in real time, speed is high, and response is fast (being less than bold and unconstrained second grade)；
3. built-in multiple sensors measure and multi-parameter Compensation amendment, it is convenient for high-acruracy survey；
4. using special process material, anti-corrosion, antirust is wear-resisting, anti-sticking；
5. without movable member, reduces and safeguard and improve reliability；
6. meet scene explosion-proof (Ex Ia/d IIC T4~T6Ga/Gb) and protect (IP68) grade, by CE,
IP68, RoHS certification；
7. built-in self diagnosis and warning function help quickly to determine instrument fault；
8. 16, at least 1 tunnel precision 4-20mA simulation outputs, optional SPST relays output；
9. at least 1 line RS-485 physical interfaces, ModBus-RTU communications protocol；
10. customizable multiple sensors specification meets various media applications requirements；
Band prompt facility and contactless, free of demolition operation interface, are easy to onsite application；
Platform wireless remote transmission, remote networking can be postponed, it is illustrated that and text is shown, record moisture variation is corresponding with temperature change
History instantaneous value, long-range modeling is provided and long-range mark inspection is supported.
(4) it illustrates
Attached drawing 1：Structure composition diagram；
Attached drawing 2：Instrument measurement method diagram；
Attached drawing 3：Microwave source and signal processing circuit diagram.
Claims (6)
1. a kind of online non-contact microwave radar Moisture Meter, hereinafter referred to as Moisture Meter are mainly used for irregular molding static
Or movement blending agent real-time online moisture detection, it is characterized in that at least but do not limit to 5 part form, see knot
Structure forms Fig. 1, and 1：Moisture signal acquisition part is also named in antenna module part (10), include at least a pair of of antenna (11) and (or)
It is several to matrix antenna, RF coaxial relay, coaxial wire jumper and pumping signal isolator (12), it is main to complete measured point single-point
Or the acquisition of the moisture information of multiple spot, i.e. the microwave physical parameter of output drive signal and acquisition transmit damage after penetrating measured medium
The microwave physical parameter of mistake；Output drive signal is exported by vector detection module, and isolation is sent to by radio frequency coaxial-cable wire jumper
Device, then RF coaxial relay is sent to by coaxial cable jumper, it is finally output to transmitting antenna, receives signal then by reception day
Line through coaxial cable jumper to RF coaxial relay, then by coaxial cable jumper to vector detection module receiving terminal, to single-point
For detection, direct coaxial cable jumper short circuit RF coaxial relay, complete moisture signal acquisition；2：Multisensor assembly portion
Divide (20), it is made of the thermal module (21) for obtaining measured medium point multiple sensor assemblies, and position module (22) is thick
It spends (23), ambient humidity (24), Media density (25) and other related sensor modules；3：Vector detection module part
(30), it is made of microwave source and microwave signal process circuit, is connected on one side with moisture signal acquisition part by coaxial cable jumper
Another side is connect with circuit in moisture instrument, acquisition process and the signal excitation of moisture signal is completed, by sending and receiving
The comparison of microwave signal is found out and the relevant decaying size of moisture and phase size；4：Multi-sensor Fusion part (40), mainly
Complete temperature, position, thickness, ambient humidity, the calibration and amendment of Media density and other relevant sensor signals, to provide
Moisture instrument provides accurate signal；5：Moisture instrument (50) be both human-machine operation dialogue display window and contact with foreign countries it is each
Kind termination, interior gauge outfit includes the circuits, wherein terminal board such as terminal board, measuring circuit plate, master control borad, display board and finger-board
It is interior that corresponding flame proof use is also connected in addition to circuit and vector detection module part (30) and Multi-sensor Fusion part (40) connect
Safe grid module, terminal board is external including but not limited at least 1 road power supply terminal, at least 1 tunnel pick-up leading-out terminal, and at least 1
Road communication terminal, at least 1 pair of moisture height alarm terminal etc.；A magnetic pen is also configured outside moisture instrument (50), confession is man-machine
Operation dialogue uses.
2. the day line piece components (10) of Moisture Meter described in, multisensor assembly part (20), common point is in same operating
It works online for a long time in environment, while detecting corresponding parameter, complete measurement, amendment or supplement to water parameters, be used for
Improve the accurate description of moisture analyser；Should be by pressure resistance, heatproof, acid and alkali-resistance is wear-resisting, and resistant material is constituted, and is sprayed when necessary
Crust is protected, there is moisture-proof, dust-proof, the security protections such as thunder-lightning design.
3. the online immersion microwave radar Moisture Meter measurement method is with hereinafter abbreviation Moisture Meter measurement method, feature
It is：The echo through dieletric reflection is received to by medium Excitation Electromagnetic Wave, while by antenna using one or more pairs of radar antennas,
When being propagated in the medium using electromagnetic wave, path, electromagnetic field intensity and waveform by with electrical property by medium and magnetic field
The variation of property is influenced detecting medium by aqueous size according to information such as phase of echo, the power magnitudes received
Physical parameter simultaneously fits out the size containing water content.Its Moisture Meter measurement method is shown in Fig. 2；The object of its sensor real-time perception medium
Reason characteristic simultaneously passes to DSP as the signal processing circuit of core and fits moisture real time information and work information, and Moisture Meter is logical
Gauge outfit man machine operation interface is crossed to complete the positive sensor of terrestrial reference maintenance to be obtained to the moisture value of sensor measurement and other correlations simultaneously
Display；And/or communicated by the communication port and PC machine of Moisture Meter, and the pre- ICVS softwares in PC machine to Moisture Meter into
Row is built mark and is corrected, and will build the storage of mark result in sensor, finally, PC machine can get sensor measurement moisture value and other
Value, keeps result of detection very clear, and to measurement result analysis, interpretation intuitive and convenient, after postmenstruation expands application, detection accuracy is more
It is high, sampling point is closeer, working efficiency higher and the concern by every profession and trade, the constantly extension in the application field of Internet of Things.
4. the Moisture Meter parameter phase and decaying are to be fitted into moisture by approximate true analysis, linear calibration sees
Formula (2), wherein W- moisture values are shown in formula (1), a square calibration, A, B, C calibration coefficients, φ phases, D decaying, | φ | phase
Absolute value, | D | decaying absolute value, arg (φ) phase algebraic symbol, arg (D) decaying algebraic symbols,
W=A φ+BD+C (1)
W=A1·φ+(A2·|φ|2)·arg(φ)+B1·D+(B2·|D|2)·arg(D)+C (2)
The Moisture Meter parameter phase and decaying are to be fitted into moisture by approximate true analysis, and above-mentioned formula (1) is public
Formula (2) can be simplified to pure phase or attenuation measurement algorithm, only simply obtain phase or pad value without simultaneously
It obtains phase and decaying participates in operation.
5. the Moisture Meter causes measurement error big and introducing and density independent Measurement Algorithm to solve density unevenness,
It is characterized in that known driving frequency F, obtains wavelength X, phase (radian) φ is detected, decay D, detects medium distance d, and medium is close
Degree be ρ, α is attenuation constant, and β is phase constant, according to the relative theory and approximate condition of microwave incidence lossy dielectric, obtain as
Lower formula (3)：
And it finds out
In determining measurement medium kind, under the conditions of density p and frequency F
Relationship meet linear relation (4)
Slope A is calculated using least square methodfWith intercept k
Then
The ratio of the tangent value tan δ and density p that define loss angle δ are operator ξ,
Then
After simplification：
Also complex dielectric permittivity ε ' is acquiredp
εp=(ε 'p-ε”p)
Then complex dielectric permittivity ε 'pWithThere is relational expression (5)
By being found after the analysis to experimental dataWith the moisture W of medium, the approximately linear relationships of medium temperature T are shown in
Formula (6)
Calculate constant a, b, c using least square method, according to determining parameter AfWith intercept k and a, b, c, and detect
Dielectric thickness d temperature T, phase (radian) φ, decay D, and obtaining complex dielectric permittivity and density independent amount through data processing calculates
Sub- ξ, the medium moisture W at line computation temperature T,
That is formula (7)
This method is not required to the density of on-line checking medium, but derives corresponding relationship amount by off-line data, solves solid very well
Medium density is uneven, caused measurement error.
6. the online immersion microwave radar Moisture Meter measurement method is realized with hereinafter abbreviation Moisture Meter measurement method reality
It is existing, it is characterised in that：The signal projector portion of microwave frequency band is constituted using phase-locked loop pll and auto level control ALC technologies
Point, and receiving portion is to use superheterodyne mode；Entire circuit is formed by receiving and dispatching two parts, and the new component of core is will be crucial
Partial circuit block receives and dispatches phase demodulation, amplitude discriminator is embedded in as a replaceable modules form in entire transceiver module, and
The phase and amplitude measurement accuracy of vector parameters is also determined by these components, sees Fig. 3：Microwave source and signal processing circuit figure institute
Show, the microwave excitation signal of the power adjustment of the main scan frequency that microwave X-band 8-12GHZ is provided and 20-30DB, together
When complete reflected signal amplitude and phase change detection.
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Cited By (8)
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| CN109187669A (en) * | 2018-09-25 | 2019-01-11 | 北京工商大学 | Flour based on dielectric method or the like detecting instrument for moisture content and measuring method |
| CN109470311A (en) * | 2018-12-17 | 2019-03-15 | 吉林大学 | A kind of double hidden probe-type silo grain multi-parameter RF on-line measuring device and detection methods |
| CN111189891A (en) * | 2020-01-10 | 2020-05-22 | 漳州英特捷自动化科技有限公司 | Radio frequency wave moisture measurement method and radio frequency wave moisture meter |
| RU2737068C1 (en) * | 2020-02-05 | 2020-11-24 | Общество с ограниченной ответственностью "МИРАГЛБЭКС" | Remote moisture meter |
| CN112268913A (en) * | 2020-09-18 | 2021-01-26 | 天津大学 | Oil-gas-water three-phase flow microwave water holding rate measuring method capable of eliminating influence of water mineralization degree |
| CN112666185A (en) * | 2020-10-27 | 2021-04-16 | 西安交通大学 | Remote crude oil water content measuring device based on microwave transmission method and measuring method thereof |
| CN113884512A (en) * | 2021-10-28 | 2022-01-04 | 山东瑞中智能科技有限公司 | Waste paper water content detecting system |
| CN116678832A (en) * | 2023-06-06 | 2023-09-01 | 北京益拓科技有限公司 | Carboxylate and polymer on-line detection equipment and method |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109187669A (en) * | 2018-09-25 | 2019-01-11 | 北京工商大学 | Flour based on dielectric method or the like detecting instrument for moisture content and measuring method |
| CN109470311A (en) * | 2018-12-17 | 2019-03-15 | 吉林大学 | A kind of double hidden probe-type silo grain multi-parameter RF on-line measuring device and detection methods |
| CN111189891A (en) * | 2020-01-10 | 2020-05-22 | 漳州英特捷自动化科技有限公司 | Radio frequency wave moisture measurement method and radio frequency wave moisture meter |
| CN111189891B (en) * | 2020-01-10 | 2023-06-27 | 漳州英特捷自动化科技有限公司 | Radio frequency wave moisture measuring method and radio frequency wave moisture meter |
| RU2737068C1 (en) * | 2020-02-05 | 2020-11-24 | Общество с ограниченной ответственностью "МИРАГЛБЭКС" | Remote moisture meter |
| CN112268913A (en) * | 2020-09-18 | 2021-01-26 | 天津大学 | Oil-gas-water three-phase flow microwave water holding rate measuring method capable of eliminating influence of water mineralization degree |
| CN112666185A (en) * | 2020-10-27 | 2021-04-16 | 西安交通大学 | Remote crude oil water content measuring device based on microwave transmission method and measuring method thereof |
| CN113884512A (en) * | 2021-10-28 | 2022-01-04 | 山东瑞中智能科技有限公司 | Waste paper water content detecting system |
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Application publication date: 20180814 |