CN113358708A - Non-contact measuring device and method for solution concentration - Google Patents
Non-contact measuring device and method for solution concentration Download PDFInfo
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- CN113358708A CN113358708A CN202110633323.4A CN202110633323A CN113358708A CN 113358708 A CN113358708 A CN 113358708A CN 202110633323 A CN202110633323 A CN 202110633323A CN 113358708 A CN113358708 A CN 113358708A
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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
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
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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
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/045—Circuits
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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
- G01N27/228—Circuits therefor
Abstract
The invention relates to a non-contact measuring device and a measuring method for solution concentration, which comprises a signal measuring unit, a resonance microstrip line circuit unit and a sample chamber filled with a solution to be measured, wherein the signal measuring unit, the resonance microstrip line circuit unit and the sample chamber are sequentially arranged; the signal measuring unit is connected with the resonance microstrip line circuit unit; the resonant microstrip line circuit unit is equivalent to a first RLC resonant circuit, and the part of the solution to be tested is equivalent to a second RLC resonant circuit; when the first RLC resonant circuit is coupled with the second RLC resonant circuit, the signal measuring unit detects parameter change of the first RLC resonant circuit and predicts concentration change of the solution to be measured according to the parameter change. The method can realize the accurate detection of the change of the solution concentration by constructing two coupled RLC resonance equivalent circuits; compared with the traditional non-invasive solution concentration detection implementation mode, the method provided by the invention does not need a complex device, and has the advantages of high sensitivity and wide application range.
Description
Technical Field
The invention relates to the technical field of solution concentration measurement, in particular to a non-contact measurement device and a measurement method for solution concentration.
Background
At present, methods for detecting the concentration of a solution include a pycnometry method, an optical rotation method, a spectrophotometry method, an ultrasonic method, and a refractive index method.
The hydrometric method has the highest precision, but is not suitable for rapid field detection. The optical rotation method is related to the composition of the solution, and the application range is limited. Although the ultrasonic method and the refractive index method can be used for non-invasive detection, the manufacturing cost is high, the precision depends on complex processing equipment, and the application frequency range is also strongly limited.
Therefore, there is a need for a new solution concentration non-contact measurement device and method.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a non-contact measuring device and a measuring method for solution concentration, which can realize the accurate detection of the change of the solution concentration by constructing two coupled RLC resonance equivalent circuits; compared with the traditional non-invasive solution concentration detection implementation mode, the method provided by the invention does not need a complex device, and has the advantages of high sensitivity and wide application range.
In order to solve the technical problem, the invention provides a non-contact measuring device and a measuring method for solution concentration, which comprises a signal measuring unit, a resonance microstrip line circuit unit and a sample chamber filled with a solution to be measured, wherein the signal measuring unit, the resonance microstrip line circuit unit and the sample chamber are sequentially arranged; the signal measuring unit is connected with the resonance microstrip line circuit unit; the resonant microstrip line circuit unit is equivalent to a first RLC resonant circuit, and the part of the solution to be tested is equivalent to a second RLC resonant circuit; when the first RLC resonant circuit is coupled with the second RLC resonant circuit, the signal measuring unit detects parameter change of the first RLC resonant circuit and predicts concentration change of the solution to be measured according to the parameter change.
Preferably, the distance between the sample chamber and the resonant microstrip line circuit unit is less than 10 mm.
Preferably, the sample chamber is a disc-shaped container.
Preferably, the signal measuring unit is a network analyzer to simplify the complexity of the circuit; and the resonance microstrip line circuit unit is connected with a port of the network analyzer.
Preferably, the sample chamber is made of a quartz glass material.
A method for non-contact measurement of solution concentration for detecting the concentration of a solution to be measured, preferably comprising the steps of: s1 and S1, providing a sample chamber, wherein the sample chamber is filled with a solution to be detected, and is electrified, and the solution to be detected forms a solution closed loop circuit; s2, arranging a resonance microstrip line circuit unit at one side of the sample chamber; s3, coupling between the solution closed-loop circuit and the resonant microstrip line circuit unit is achieved by adjusting the frequency of the solution closed-loop circuit and the frequency of the resonant microstrip line circuit unit; and S4, predicting the change of the concentration of the solution to be measured by measuring the parameter change of the resonant microstrip line circuit unit.
Preferably, in step S4, the parameters in the resonant microstrip line circuit unit include a resonant frequency and a reflection coefficient amplitude.
Preferably, in step S3, the solution closed loop circuit is equivalent to a second RLC resonance circuit, and the resonant microstrip line circuit unit is equivalent to a first RLC resonance circuit.
Preferably, in step S3, when the concentration of the solution to be measured changes, the capacitance, the inductance, and the resistance in the solution closed-loop circuit all change; when the frequency of the solution closed-loop circuit is close to that of the resonant microstrip line circuit unit, the first RLC resonant circuit and the second RLC resonant circuit are coupled.
Preferably, a signal measuring unit is disposed at one side of the resonant microstrip line circuit unit to detect a parameter change of the first RLC resonant circuit.
Compared with the prior art, the technical scheme of the invention has the following advantages:
1. the invention comprises a signal measuring unit, a resonance microstrip line circuit unit and a sample chamber filled with a solution to be measured; simple structure, no need of more complex device and low manufacturing cost.
2. The resonance microstrip line circuit unit and the sample chamber filled with the solution to be tested are respectively equivalent to a first RLC resonance circuit and a second RLC resonance circuit; the first RLC resonant circuit is coupled with the second RLC resonant circuit to enable the signal measuring unit to detect the concentration change of the solution to be detected. Compared with the traditional non-invasive solution concentration detection implementation mode, the method has higher sensitivity.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the present disclosure taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic diagram of the apparatus of the present invention;
FIG. 2 is a schematic diagram of the circuit structure of the present invention;
FIG. 3 is a diagram illustrating the coupling of a first RLC resonant circuit and a second RLC resonant circuit according to a second embodiment;
FIG. 4 is a graph showing the relationship between the concentration of the solution and the magnitude of the reflection coefficient in the second embodiment;
FIG. 5 is a diagram showing the relationship between the concentration of the solution and the resonant frequency in the second embodiment.
The specification reference numbers indicate: 1-resonance microstrip line circuit unit, 2-first RLC resonance circuit, 3-sample chamber, 4-solution to be tested, 5-second RLC resonance circuit.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
Referring to fig. 1 to 5, the present invention discloses a non-contact measurement apparatus and a measurement method for solution concentration, including:
the non-contact measuring device for the solution concentration is used for detecting the concentration of a solution 4 to be measured, and particularly comprises a signal measuring unit, a resonant microstrip line circuit unit 1 and a sample chamber 3 filled with the solution 4 to be measured which are adjacently arranged. Simple structure, no need of more complex device and low manufacturing cost.
The signal measuring unit is preferably a network analyzer in an actual measuring device to simplify the circuit principle and reduce the cost, and a port of the network analyzer is connected with the resonant microstrip line circuit unit 1.
According to the microwave principle, the resonance microstrip line circuit unit 1 is equivalent to a first RLC resonance circuit 2, and the part of the solution to be measured 4 is equivalent to a second RLC resonance circuit 5.
When the concentration of the solution 4 to be measured in the sample chamber 3 changes, the capacitance, inductance, and resistance of the second RLC resonant circuit 5 all change. When the frequencies of the first RLC resonant circuit 2 and the second RLC resonant circuit 5 are close to each other, a coupling effect occurs between the first RLC resonant circuit 2 and the second RLC resonant circuit 5, so that the resonant frequency of the first RLC resonant circuit 2 is greatly deviated along with the change of the concentration of the solution 4 to be measured, and the reflection coefficient amplitude of the first RLC resonant circuit 2 is also greatly changed, and the change of the concentration of the solution can be predicted through the change of the two values. Compared with the traditional non-invasive solution concentration detection implementation mode, the method has higher sensitivity.
Preferably, the sample chamber 3 is a disc-shaped container, and a liquid inlet and a liquid outlet are respectively formed at the top end and the bottom end of the sample chamber 3. The sample chamber 3 is made of quartz glass.
Further, the size of the resonant microstrip circuit unit 1 is determined by the size of the sample chamber 3 and the distance between the resonant microstrip circuit unit and the solution 4 to be measured. Preferably, the distance between the sample chamber 3 filled with the solution 4 to be measured and the resonant microstrip line circuit unit 1 is less than 10mm, so as to ensure the sensitivity of measurement.
A non-contact measurement method for solution concentration, which can accurately detect the change of the concentration of a solution 4 to be detected, comprises the following steps:
s1, providing a sample chamber 3, filling the sample chamber 3 with a solution 4 to be tested, and electrifying the sample chamber 3 to form a solution closed-loop circuit by the solution 4 to be tested. The dielectric constant epsilon of the concentration of the solution 4 to be tested can be accurately characterized by a Debye model. Establishing a Debye model for calculating the dielectric constant of the concentration of the solution to be measured 4:
wherein epsilon is the dielectric constant of the concentration of the solution 4 to be measured, epsilon 'is the real part of the dielectric constant of the concentration of the solution 4 to be measured, epsilon' is the imaginary part of the dielectric constant of the concentration of the solution 4 to be measured, and epsilon∞Dielectric constant, epsilon, of the concentration of the solution 4 to be measured at infinite frequencysIs the dielectric constant of the concentration of the solution 4 to be measured under the direct current electric field, tau is the relaxation time of the solution 4 to be measured, j is an imaginary unit, and omega is the angular frequency.
Preferably, when the concentration of the solution to be measured changes, the parameters in the Debye model and the change of the concentration of the solution to be measured have a linear relationship, and thus, the change of the concentration of the solution can be detected by detecting the change of the dielectric constant.
S2, arranging a resonance microstrip line circuit unit 1 at one side of the sample chamber 3.
And S3, according to the microwave principle, the resonant microstrip line circuit unit 1 is equivalent to a first RLC resonant circuit 2, and the solution closed loop circuit part is equivalent to a second RLC resonant circuit 5.
Specifically, when the concentration of the solution 4 to be measured changes, the capacitance, the inductance, and the resistance in the second RLC resonant circuit 5 all change. When the frequencies of the first RLC resonant circuit 2 and the second RLC resonant circuit are close to each other, a coupling effect occurs between the first RLC resonant circuit 2 and the second RLC resonant circuit. The coupling effect enables the resonant frequency of the first RLC resonant circuit 2 to generate larger frequency deviation along with the change of the concentration of the solution 4 to be detected and enables the reflection coefficient amplitude of the first RLC resonant circuit 2 to generate larger change.
And S4, obtaining the change of the concentration of the solution 4 to be measured through the change of the resonance frequency and the reflection coefficient amplitude.
Example two
The coupling coefficient between the first RLC resonant circuit 2 and the second RLC resonant circuit 5 is larger than the coupling coefficient occurring at the EP point between the resonant circuits to realize the occurrence of two resonance points.
The test solution 4 is selected to be a glucose solution. When the eigenfrequency between the first RLC resonant circuit 2 and the second RLC resonant circuit 5 is close, two resonance points occur by adjusting the distance between the resonant microstrip line circuit unit 1 and the sample chamber 3 containing the solution 4 to be measured so that the coupling coefficient between the first RLC resonant circuit 2 and the second RLC resonant circuit 5 is greater than 0.4. As shown in fig. 3, when the specific weight of the glucose solution is changed by 1% to 5%, the resonance frequencies of the first RLC resonance circuit 2 and the second RLC resonance circuit 5 are both shifted, and the reflection coefficient amplitude is also largely changed.
Referring to fig. 4, the reflection amplitude changes as the solution concentration changes. For one of the resonance point reflection coefficients, the sensitivity reaches 15dB/[10mg/mL ]. For another resonance point, especially when the concentration of the solution 4 to be tested is changed between 1% and 2%, the sensitivity reaches 25dB/[10mg/mL ]. The resonance frequency changes with the change of the solution concentration, and both resonance points can achieve a sensitivity of 10MHz/[10mg/mL ] as shown in FIG. 5. Compared with the traditional method, the coupling resonance testing method adopted by the scheme has excellent sensitivity no matter the resonance frequency offset of the slave port or the reflection coefficient amplitude variation.
The method can non-invasively measure the change of the concentration of the solution 4 to be measured, does not need a complex device compared with other microwave non-invasive measuring methods, and has higher sensitivity. The invention can be used for detecting the concentration change of the solution, can also be used in the detection field of the sugar content of fruits, the water content of materials and the like, and can be particularly applied to noninvasive blood sugar measurement, eye aqueous humor substance concentration and other applications.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (10)
1. A non-contact measuring device for solution concentration, which is used for detecting the concentration of a solution to be measured, is characterized by comprising:
the device comprises a signal measuring unit, a resonant microstrip line circuit unit and a sample chamber filled with a solution to be measured, which are arranged in sequence;
the signal measuring unit is connected with the resonance microstrip line circuit unit; the resonant microstrip line circuit unit is equivalent to a first RLC resonant circuit, and the part of the solution to be tested is equivalent to a second RLC resonant circuit;
when the first RLC resonant circuit is coupled with the second RLC resonant circuit, the signal measuring unit detects parameter change of the first RLC resonant circuit and predicts concentration change of the solution to be measured according to the parameter change.
2. The device according to claim 1, wherein the distance between the sample chamber and the resonant microstrip line circuit unit is less than 10 mm.
3. The device of claim 1, wherein the sample chamber is a disk-shaped container.
4. The device for non-contact measurement of solution concentration according to claim 1, wherein the signal measuring unit is a network analyzer.
5. The device of claim 1, wherein the sample chamber is made of a quartz glass material.
6. A non-contact measurement method for solution concentration is used for detecting the concentration of a solution to be detected, and is characterized by comprising the following steps:
s1, providing a sample chamber, wherein the sample chamber is filled with a solution to be detected, and is electrified, and the solution to be detected forms a solution closed loop circuit;
s2, arranging a resonance microstrip line circuit unit at one side of the sample chamber;
s3, coupling between the solution closed-loop circuit and the resonant microstrip line circuit unit is achieved by adjusting the frequency of the solution closed-loop circuit and the frequency of the resonant microstrip line circuit unit;
and S4, predicting the change of the concentration of the solution to be measured by measuring the parameter change of the resonant microstrip line circuit unit.
7. The method according to claim 6, wherein in step S4, the parameters in the resonant microstrip line circuit unit include a resonance frequency and a reflection coefficient amplitude.
8. The method according to claim 6, wherein in step S3, the solution closed loop circuit is equivalent to a second RLC resonant circuit, and the resonant microstrip line circuit unit is equivalent to a first RLC resonant circuit.
9. The method according to claim 8, wherein in step S3, when the concentration of the solution to be measured changes, the capacitance, inductance, and resistance of the solution closed loop circuit all change;
when the frequency of the solution closed-loop circuit is close to that of the resonant microstrip line circuit unit, the first RLC resonant circuit and the second RLC resonant circuit are coupled.
10. The method of claim 9, wherein a signal measuring unit is provided at one side of the resonant microstrip line circuit unit to detect a parameter change of the first RLC resonant circuit.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110633323.4A CN113358708A (en) | 2021-06-07 | 2021-06-07 | Non-contact measuring device and method for solution concentration |
| PCT/CN2021/099609 WO2022257096A1 (en) | 2021-06-07 | 2021-06-11 | Solution concentration non-contact measurement apparatus and measurement method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110633323.4A CN113358708A (en) | 2021-06-07 | 2021-06-07 | Non-contact measuring device and method for solution concentration |
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| CN113358708A true CN113358708A (en) | 2021-09-07 |
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| CN202110633323.4A Pending CN113358708A (en) | 2021-06-07 | 2021-06-07 | Non-contact measuring device and method for solution concentration |
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| WO (1) | WO2022257096A1 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4590424A (en) * | 1982-09-28 | 1986-05-20 | Pharmuka Laboratoires | Detection of ion concentration in a liquid |
| CN105067654A (en) * | 2015-09-11 | 2015-11-18 | 天津大学 | Single-mode resonant cavity sensor-based solution concentration measurement method |
| CN105866158A (en) * | 2016-03-31 | 2016-08-17 | 武汉大学 | Resonant magnetic coupling-based nondestructive solution concentration detection device and detection method |
| CN107356613A (en) * | 2017-08-28 | 2017-11-17 | 天津大学 | A kind of microwave resonant cavity sensor measurement of blood sugar concentration method |
| US20200209194A1 (en) * | 2017-09-07 | 2020-07-02 | Tyco Electronics Japan G.K. | Concentration Measuring Instrument |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60242702A (en) * | 1985-03-25 | 1985-12-02 | Hitachi Ltd | Microwave resonance circuit |
| CN111565639B (en) * | 2017-11-15 | 2023-06-06 | 新加坡科技设计大学 | Device and method for non-invasively monitoring blood glucose |
| CN108828014A (en) * | 2018-05-09 | 2018-11-16 | 上海交通大学 | Sensor chip, marker detection device and detection method |
-
2021
- 2021-06-07 CN CN202110633323.4A patent/CN113358708A/en active Pending
- 2021-06-11 WO PCT/CN2021/099609 patent/WO2022257096A1/en unknown
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4590424A (en) * | 1982-09-28 | 1986-05-20 | Pharmuka Laboratoires | Detection of ion concentration in a liquid |
| CN105067654A (en) * | 2015-09-11 | 2015-11-18 | 天津大学 | Single-mode resonant cavity sensor-based solution concentration measurement method |
| CN105866158A (en) * | 2016-03-31 | 2016-08-17 | 武汉大学 | Resonant magnetic coupling-based nondestructive solution concentration detection device and detection method |
| CN107356613A (en) * | 2017-08-28 | 2017-11-17 | 天津大学 | A kind of microwave resonant cavity sensor measurement of blood sugar concentration method |
| US20200209194A1 (en) * | 2017-09-07 | 2020-07-02 | Tyco Electronics Japan G.K. | Concentration Measuring Instrument |
Non-Patent Citations (1)
| Title |
|---|
| YUN JIE MAO: "a noncontact microwave sensor based on cylindrical resonator for detecting concentration of liquid solutions", 《IEEE》, 15 January 2021 (2021-01-15), pages 1208 - 1214 * |
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| WO2022257096A1 (en) | 2022-12-15 |
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