CN113418939A - Microwave resonance structure and system for measuring concentration of solutions such as rubber latex - Google Patents
Microwave resonance structure and system for measuring concentration of solutions such as rubber latex Download PDFInfo
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- CN113418939A CN113418939A CN202110745003.8A CN202110745003A CN113418939A CN 113418939 A CN113418939 A CN 113418939A CN 202110745003 A CN202110745003 A CN 202110745003A CN 113418939 A CN113418939 A CN 113418939A
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- rubber latex
- concentration
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- cavity
- microwave resonance
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- 229920000126 latex Polymers 0.000 title claims abstract description 44
- 239000000523 sample Substances 0.000 claims abstract description 23
- 238000005259 measurement Methods 0.000 claims description 12
- 230000003321 amplification Effects 0.000 claims description 5
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 4
- 238000010030 laminating Methods 0.000 claims 1
- 239000007788 liquid Substances 0.000 abstract description 13
- 238000000034 method Methods 0.000 abstract description 12
- 229910052751 metal Inorganic materials 0.000 abstract description 5
- 239000002184 metal Substances 0.000 abstract description 5
- 230000008859 change Effects 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000002955 isolation Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 238000012271 agricultural production Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000011796 hollow space material Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000004816 latex Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000009774 resonance method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 238000000196 viscometry Methods 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- 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
-
- 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
Abstract
The invention discloses a microwave resonance structure and a microwave resonance system for measuring the concentration of solutions such as rubber latex and the like, and the microwave resonance structure and the microwave resonance system comprise a cylindrical cavity, wherein the top of the cylindrical cavity is provided with an opening, the bottom of the cylindrical cavity is provided with a round hole, the inner cavity of the round hole is provided with a coaxial probe, the outer edge of the coaxial probe is sleeved with an insulating medium, the rubber latex is filled in the whole space of the cylindrical cavity, and compared with a resonant cavity perturbation method for measuring the measured liquid, the influence of the measured liquid on the resonance frequency of a resonant cavity is large, so that the dielectric constant change of the measured liquid can be measured more sensitively and more accurately; the opening on the top surface of the cylindrical cavity is arranged, so that the measured liquid is convenient to pour and pour, and the measuring process is convenient and quick; the coaxial structure formed by the metal probe and the metal cylinder is used for feeding the resonant cavity, common coaxial structures such as an SMA connector, an N-type connector and a BNC structure can be used for feeding, and the coaxial structure is convenient to realize and connect and low in cost.
Description
Technical Field
The invention relates to the technical field of microwave resonance, in particular to a microwave resonance structure and a microwave resonance system for measuring the concentration of solutions such as rubber latex.
Background
The measurement of the concentration of the liquid mixture has wide requirements in the fields of agricultural production, chemical industry, medicine, life and the like. Methods for measuring concentration are also available, such as drying, evaporative curing measurements, density methods, viscometry, conductivity methods, optics, microwave transmittance methods, optical refractive index methods, and the like. Each mode has own advantages and disadvantages, and has the disadvantages of long measuring time, complex measurement, high measuring cost, limited application range and the like.
The principle of measuring the dielectric constant of liquid by using a microwave resonance method is also applied in scientific measuring instruments for a long time, and the dielectric constant of the liquid is related to the concentration (mass or volume percentage) of a substance, so that the method for measuring the concentration of the liquid by using the microwave has various modes; meanwhile, a small part of solution to be measured is placed in a closed container and then placed in a cavity to meet the requirements of the perturbation method, and the concentration of the substance is measured through the change of the resonant frequency.
Disclosure of Invention
The invention solves the technical problems of inconvenience in solution entering, low sensitivity and accuracy in measurement, single joint use and the like in the prior art, and provides a microwave resonance structure and a microwave resonance system for measuring the concentration of solutions such as rubber latex and the like. The microwave resonance structure and the system for measuring the concentration of the solution such as the rubber latex have the characteristics of convenience for solution entering, more sensitive and accurate measurement and capability of adopting common coaxial structures such as an SMA connector, an N-type connector and a BNC structure for feeding.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a microwave resonance structure and system for measuring solution concentration such as rubber latex, includes cylinder type cavity, cylinder type cavity top is the opening setting, and it is half open setting, the round hole has been seted up to cylinder type cavity bottom, the round hole inner chamber is equipped with coaxial probe, coaxial probe outside edge cover is equipped with insulating medium, the insulating medium outside is laminated with the round hole is inside, the bottom of cylinder type cavity is equipped with coaxial signal feed-in structure.
Preferably, the round hole is matched with the insulating medium.
Preferably, the coaxial signal feed-in structure is composed of a coaxial probe and a cylindrical cavity.
Preferably, the coaxial probe and the top end of the insulating medium extend to the inner cavity of the cylindrical cavity body together.
Preferably, the insulating medium is arranged in a cylindrical shape, and the insulating medium is matched with the coaxial probe.
Preferably, the cross section of the cylindrical cavity is not limited to a cylinder, and can be in a rectangular, spherical, trapezoidal or other structure.
Preferably, the position of the circular hole on the cylindrical cavity is not limited to the central position of the cylindrical cavity.
A microwave resonance system for measuring the concentration of a solution such as rubber latex comprises the following steps:
s1: pouring rubber latex with different concentrations into the cylindrical cavity;
s2: then measuring an echo signal of the resonant cavity through the sweep frequency source module;
s3: echo signals of the resonant cavity are reflected back to a C2 port of the directional coupler through a coaxial feed end and are coupled to a detection amplifying circuit through a C3 port;
s4: obtaining a fitting curve of the corresponding relation between the resonant frequency and the rubber latex concentration through a directional coupler module and an analog amplification module;
s5: then, inquiring a fitting curve, and quickly measuring the concentration of the rubber latex;
s6: the existing scientific principle shows that the principle formula of the measurement is to measure the concentration of the rubber latex by the measurement principle that the dielectric constants of different media are different and the resonant frequencies are different.
Compared with the prior art, the invention has the beneficial effects that:
1. when the device is used, the column-shaped cavity is arranged in a semi-open mode, so that the rubber latex can be filled in the whole space of the column-shaped cavity, and compared with a resonant cavity perturbation method for measuring the liquid to be measured, the resonant cavity resonance frequency is greatly influenced by the liquid to be measured, and therefore the dielectric constant change of the liquid to be measured can be measured more sensitively and more accurately;
2. when the liquid pouring device is used, the liquid to be measured is poured and poured conveniently through the opening on the top surface of the cylindrical cavity, and the measuring process is convenient and quick;
3. when the coaxial feed-type resonant cavity is used, the coaxial structure formed by the metal probe and the metal cylinder is used for feeding the resonant cavity, common coaxial structures such as an SMA connector, an N-type connector and a BNC structure can be adopted for feeding, and the coaxial feed-type resonant cavity is convenient to realize and connect and low in cost.
Drawings
FIG. 1 is a schematic structural view of a cylindrical chamber according to the present invention;
FIG. 2 is a system composition diagram of the present invention;
FIG. 3 is a plot of the resonant frequency of a sweep frequency according to the present invention;
FIG. 4 is a graph of the resonant frequency versus concentration according to the present invention.
Reference numbers in the figures: 1. a coaxial probe; 2. an insulating medium; 3. a cylindrical cavity; 4. a coaxial signal feed-in structure; 5. a rubber latex container; 6. a sweep frequency source module; 7. a directional coupler module; 8. an analog amplification module; 9. an information processor.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-4, the present invention provides a technical solution: a microwave resonance structure and system for measuring the concentration of solutions such as rubber latex and the like comprises a cylindrical cavity 3, the cross section of the cylindrical cavity 3 is not limited to a cylindrical shape and can be a rectangle, a sphere, a trapezoid and the like, the top of the cylindrical cavity 3 is provided with an opening and is arranged in a semi-open manner, a round hole is formed in the bottom of the cylindrical cavity 3, the position of the round hole in the cylindrical cavity 3 is not limited to the central position of the cylindrical cavity 3, a coaxial probe 1 is arranged in the round hole inner cavity, an insulating medium 2 is sleeved on the outer side edge of the coaxial probe 1, the outer side of the insulating medium 2 is attached to the inside of the round hole, the coaxial probe 1 and the top end of the insulating medium 2 jointly extend to the inner cavity of the cylindrical cavity 3, the round hole is matched with the insulating medium 2, the installation of the insulating medium 2 and the round hole is more stable through the arrangement, the insulating medium 2 is arranged in a cylindrical manner, and the insulating medium 2 is matched with the coaxial probe 1, the bottom of the cylindrical cavity 3 is provided with a coaxial signal feed-in structure 4, and the coaxial signal feed-in structure 4 is composed of a coaxial probe 1 and the cylindrical cavity 3.
A microwave resonance system for measuring the concentration of a solution such as rubber latex comprises the following steps:
s1: pouring rubber latex with different concentrations into the cylindrical cavity 3;
s2: then measuring an echo signal of the resonant cavity through the sweep frequency source module 6;
s3: echo signals of the resonant cavity are reflected back to a C2 port of the directional coupler 7 through a coaxial feed end and are coupled to a detection amplifying circuit through a C3 port;
s4: obtaining a fitting curve of the corresponding relation between the resonant frequency and the rubber latex concentration through the directional coupler module 7 and the analog amplification module 8;
s5: then, inquiring a fitting curve, and quickly measuring the concentration of the rubber latex;
s6: the existing scientific principle shows that the principle formula of the measurement is to measure the concentration of the rubber latex by the measurement principle that the dielectric constants of different media are different and the resonant frequencies are different.
According to fig. 1 and 2: designing a resonant cavity structure, wherein the structural parameters are as follows, Dc =40mm, Hc =30mm, Lp =10mm, La =12mm, Dp =1.3mm and Df =4.2 mm; wherein the cylindrical cavity is made of aluminum, the metal probe is made of copper, and the insulating dielectric material is teflon; the coaxial connector of the resonant cavity adopts an SMA connector, and the cylindrical cavity 3 is immersed in the rubber latex container 5, so that the rubber latex is immersed in the hollow space inside the cylindrical cavity 3; the directional coupler module 7 in fig. 2 adopts a classical microstrip 4-port directional coupler, wherein C1 and C2 are input and output ends of the directional coupler, C3 is a coupling end of a C2 port and an isolation end of a C1 port, and C4 is a coupling end of a C1 port and an isolation end of a C2 port, where the C4 port is connected with a 50 ohm load; in fig. 2, the swept frequency source module 6 is connected to the input port C1 of the directional coupler module 7 through a coaxial cable, and is connected to the C2 port of the directional coupler on the SMA joint, and the microwave signal is fed through the C2 port. The sweep frequency range of the sweep frequency source covers the frequency ranges corresponding to the rubber latex with different concentrations. The frequency sweeping source can be realized by using various chips or structures such as DDS, VCO and the like, and the scheme is realized by using a VCO chip with PLL (phase locked loop), as shown in figure 2. The scanning frequency range is 1GHz-3GHz, and the scanning frequency interval is 1 MHz. The swept frequency power need not be too high, with the goal that the echo power is above the power detection sensitivity of the detector. Considering that the resonant peak at the resonant frequency is possibly-40 dB, the sensitivity of the detector is-60 dBm, the coupling degree of the directional coupler is-20 dB, considering a certain system margin, the emission power of the sweep frequency source is more than 0dBm, and the process introduces a feeding and detecting mode of a certain single frequency. In the aspect of system implementation, the ARM single chip microcomputer controls the VCO to realize frequency scanning, the output frequency of the frequency scanning chip is changed one by one, and the wave detector acquires the amplitude of the echo signal.
According to the illustration in fig. 3: the resonant frequency is typically a power low point and an extreme point. Because the measured data has noise and fluctuation, the measured curve is firstly filtered to smoothly filter the noise. Then, a power criterion is used for finding a point lower than the set power, and then whether the points on the left side and the right side of the point are higher than the point is judged, and if yes, the point is judged to be an effective point. When the number of points is not large, the resonance point found in fig. 3 is around 1.49GHz as the value of the resonance point frequency, which is the average of the number of points.
According to FIG. 4: by measuring the resonant frequency curve of a series of rubber latex with known concentration, a series of data of the rubber latex concentration versus resonant frequency can be formed. Fitting the curve by a quadratic polynomial to obtain a function curve of the corresponding relation between the resonance frequency and the concentration.
The working principle is as follows: when the device is used, rubber latex with different concentrations is poured into the cylindrical cavity 3, so that the inside of the cylindrical cavity 3 is filled with solution, then the echo signals of the resonant cavity are measured through the sweep frequency source module 6, the resonant frequencies of the latex with different concentrations can be obtained, the rubber latex with standard concentration is selected out from the resonant frequencies to measure the resonant frequency of the cavity, and a fitting curve of the corresponding relation between the resonant frequency and the rubber latex concentration is obtained through the directional coupler module 7 and the analog amplification module 8, so that the resonant frequency is obtained through measurement for the rubber latex with unknown concentration, and then the fitting curve is inquired, so that the concentration of the rubber latex can be quickly measured.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A microwave resonance structure and system for measuring solution concentration such as rubber latex, including cylinder type cavity (3), its characterized in that: the utility model discloses a coaxial probe, including cylinder type cavity (3), round hole, coaxial probe (1), insulating medium (2), the round hole is seted up to cylinder type cavity (3) top for the opening setting, and it is half open setting, the round hole has been seted up to cylinder type cavity (3) bottom, the round hole inner chamber is equipped with coaxial probe (1), coaxial probe (1) outside edge cover is equipped with insulating medium (2), the laminating inside insulating medium (2) outside and the round hole, the bottom of cylinder type cavity (3) is equipped with coaxial signal feed-in structure (4).
2. The microwave resonance structure and system for measuring the concentration of a solution such as a rubber latex according to claim 1, wherein: the round holes are matched with the insulating medium (2).
3. The microwave resonance structure and system for measuring the concentration of a solution such as a rubber latex according to claim 1, wherein: the coaxial signal feed-in structure (4) is composed of a coaxial probe (1) and a cylindrical cavity (3).
4. The microwave resonance structure and system for measuring the concentration of a solution such as a rubber latex according to claim 1, wherein: the coaxial probe (1) and the top end of the insulating medium (2) extend to the inner cavity of the cylindrical cavity (3) together.
5. The microwave resonance structure and system for measuring the concentration of a solution such as a rubber latex according to claim 1, wherein: the insulating medium (2) is arranged in a cylindrical mode, and the insulating medium (2) is matched with the coaxial probe (1).
6. The microwave resonance structure and system for measuring the concentration of a solution such as a rubber latex according to claim 1, wherein: the cross section of the cylindrical cavity (3) is not limited to be cylindrical, and can be in a rectangular, spherical, trapezoidal and other structures.
7. The microwave resonance structure and system for measuring the concentration of a solution such as a rubber latex according to claim 1, wherein: the position of the round hole on the cylindrical cavity (3) is not limited to the central position of the cylindrical cavity (3).
8. The microwave resonance system for measuring the concentration of a solution such as a rubber latex according to claim 1, comprising the steps of:
s1: pouring rubber latex with different concentrations into the cylindrical cavity 3;
s2: then measuring an echo signal of the resonant cavity through the sweep frequency source module 6;
s3: echo signals of the resonant cavity are reflected back to a C2 port of the directional coupler 7 through a coaxial feed end and are coupled to a detection amplifying circuit through a C3 port;
s4: obtaining a fitting curve of the corresponding relation between the resonant frequency and the rubber latex concentration through the directional coupler module 7 and the analog amplification module 8;
s5: then, inquiring a fitting curve, and quickly measuring the concentration of the rubber latex;
s6: the existing scientific principle shows that the principle formula of the measurement is to measure the concentration of the rubber latex by the measurement principle that the dielectric constants of different media are different and the resonant frequencies are different.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110745003.8A CN113418939A (en) | 2021-07-01 | 2021-07-01 | Microwave resonance structure and system for measuring concentration of solutions such as rubber latex |
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| CN202110745003.8A CN113418939A (en) | 2021-07-01 | 2021-07-01 | Microwave resonance structure and system for measuring concentration of solutions such as rubber latex |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4423623A (en) * | 1981-08-24 | 1984-01-03 | Rockwell International Corporation | Microwave meter for fluid mixtures |
| US5389883A (en) * | 1992-10-15 | 1995-02-14 | Gec-Marconi Limited | Measurement of gas and water content in oil |
| US5397993A (en) * | 1990-02-10 | 1995-03-14 | Tews; Manfred | Method for measuring the material moisture content of a material under test using microwaves |
| US20030011386A1 (en) * | 2001-05-30 | 2003-01-16 | Schlumberger Technology Corporation | Methods and apparatus for estimating on-line water conductivity of multiphase mixtures |
| CN102698683A (en) * | 2012-06-25 | 2012-10-03 | 电子科技大学 | Adjustable-frequency resonance microwave reaction chamber with open top |
| CN102809572A (en) * | 2012-08-08 | 2012-12-05 | 天津大学 | System for measuring solution concentration by using perturbation method |
| US20160169720A1 (en) * | 2014-12-16 | 2016-06-16 | Schlumberger Technology Corporation | Compact Microwave Water-Conductivity Probe With Integral Second Pressure Barrier |
| CN106099301A (en) * | 2016-07-19 | 2016-11-09 | 电子科技大学 | A kind of coaxial resonant cavity and application thereof |
-
2021
- 2021-07-01 CN CN202110745003.8A patent/CN113418939A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4423623A (en) * | 1981-08-24 | 1984-01-03 | Rockwell International Corporation | Microwave meter for fluid mixtures |
| US5397993A (en) * | 1990-02-10 | 1995-03-14 | Tews; Manfred | Method for measuring the material moisture content of a material under test using microwaves |
| US5389883A (en) * | 1992-10-15 | 1995-02-14 | Gec-Marconi Limited | Measurement of gas and water content in oil |
| US20030011386A1 (en) * | 2001-05-30 | 2003-01-16 | Schlumberger Technology Corporation | Methods and apparatus for estimating on-line water conductivity of multiphase mixtures |
| CN102698683A (en) * | 2012-06-25 | 2012-10-03 | 电子科技大学 | Adjustable-frequency resonance microwave reaction chamber with open top |
| CN102809572A (en) * | 2012-08-08 | 2012-12-05 | 天津大学 | System for measuring solution concentration by using perturbation method |
| US20160169720A1 (en) * | 2014-12-16 | 2016-06-16 | Schlumberger Technology Corporation | Compact Microwave Water-Conductivity Probe With Integral Second Pressure Barrier |
| CN106099301A (en) * | 2016-07-19 | 2016-11-09 | 电子科技大学 | A kind of coaxial resonant cavity and application thereof |
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Application publication date: 20210921 |
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