阅读说明：本技术 一种非接触式溶液浓度无线测量装置 (Non-contact solution concentration wireless measuring device ) 是由 张允晶 李鹏 何兴理 窦玉江 李灵锋 于 2021-08-20 设计创作，主要内容包括：本发明公开了一种非接触式溶液浓度无线测量装置,其包括：测量机部分,包括垂直极化天线、水平极化天线和用于盛装待测溶液的非接触测量装置,非接触测量装置包括液体容器和微带缺陷地结构,液体容器设置于微带缺陷地结构上,微带缺陷地结构包括微带线和双开口缝隙谐振环,收发机部分,包括通信连接的收发机和双极化收发天线。本发明非接触式溶液浓度无线测量装置利用双开口缝隙谐振环结构来检测溶液浓度变化,其精度较高。本发明能够对溶液浓度的变化进行非接触的遥测测量,相比于传统微波非侵入测量方法,具有更高的灵敏度。(The invention discloses a non-contact solution concentration wireless measuring device, which comprises: the measuring machine part comprises a vertical polarization antenna, a horizontal polarization antenna and a non-contact measuring device used for containing a solution to be measured, the non-contact measuring device comprises a liquid container and a micro-strip defected ground structure, the liquid container is arranged on the micro-strip defected ground structure, the micro-strip defected ground structure comprises a micro-strip line and a double-opening gap resonance ring, and the transceiver part comprises a transceiver and a dual-polarization transceiver which are in communication connection. The non-contact solution concentration wireless measuring device utilizes the double-opening gap resonant ring structure to detect the solution concentration change, and the precision is higher. The invention can carry out non-contact telemetering measurement on the change of the solution concentration, and has higher sensitivity compared with the traditional microwave non-invasive measurement method.)

1. A non-contact solution concentration wireless measurement device, comprising:

the measuring machine part comprises a vertical polarization antenna, a horizontal polarization antenna and a non-contact measuring device for containing a solution to be measured, wherein the non-contact measuring device comprises a liquid container and a micro-strip defected ground structure, the liquid container is arranged on the micro-strip defected ground structure, the liquid container is provided with a sample inlet and a sample outlet, the micro-strip defected ground structure comprises a micro-strip line and a double-opening gap resonance ring, a first port and a second port are formed at two ends of the micro-strip line respectively, the vertical polarization antenna is connected with the first port, and the vertical polarization antenna is connected with the second port;

the transceiver part comprises a transceiver and a dual-polarized transceiving antenna which are in communication connection;

the transceiver transmits a vertical polarization continuous wave signal through the dual-polarization transceiving antenna, the vertical polarization antenna receives the vertical polarization continuous wave signal, the vertical polarization continuous wave signal is converted into a horizontal polarization continuous wave signal from the horizontal polarization antenna after passing through a solution to be tested, the dual-polarization transceiving antenna receives the horizontal polarization continuous wave signal to obtain a power ratio S21 of the horizontal polarization continuous wave signal to the vertical polarization continuous wave signal, and the concentration of the solution to be tested is calculated according to the change of a resonance point S21.

2. The wireless contactless solution concentration measuring device according to claim 1, wherein the slit width of the double-opening slit resonance ring is larger than the opening width.

3. The wireless noncontact solution concentration measuring device according to claim 2, wherein the gap width of said double-opening gap resonance ring is 0.1-0.5mm, and the opening width of said double-opening gap resonance ring is 0.05-0.1 mm.

4. The wireless contactless solution concentration measuring device according to claim 1, wherein the power of the horizontally polarized continuous wave signal is related to the telemetry distance as follows:

wherein R is the telemetering distance, lambda is the wavelength corresponding to the working frequency, P_tFor the power transmitted by the transceiver, G_tAnd G_rGain values, P, for the transceiver and the measuring machine antennas, respectively_sIs the lowest power at which the measuring machine can operate.

5. The wireless contactless solution concentration measuring device according to claim 1, wherein the frequency band of the vertically polarized continuous wave signal is 1 to 2 GHZ.

6. The wireless noncontact solution concentration measuring device according to claim 1, wherein the microstrip line has a width greater than the opening width of the double-opening slot resonant ring.

7. The wireless noncontact solution concentration measuring device according to claim 1, wherein the sample inlet and the sample outlet are symmetrically arranged on both sides of the liquid container.

8. The wireless noncontact solution concentration measuring device according to claim 1, wherein the characteristic impedance of said microstrip line is 50 ohms.

9. The wireless contactless solution concentration measuring device according to claim 1, wherein the liquid container is quartz glass.

10. A non-contact solution concentration wireless measurement device, comprising:

the measuring machine part comprises a vertical polarization antenna, a horizontal polarization antenna, a circulator, a load and a non-contact measuring device for containing a solution to be measured, wherein the non-contact measuring device comprises a liquid container and a micro-strip defected ground structure, the liquid container is arranged on the micro-strip defected ground structure, the liquid container is provided with a sample inlet and a sample outlet, the micro-strip defected ground structure comprises a micro-strip line and a double-opening gap resonance ring, the width of the micro-strip line is greater than the opening width of the double-opening gap resonance ring, a first port and a second port are formed at two ends of the micro-strip line respectively, the vertical polarization antenna and the vertical polarization antenna are connected with the first port through the circulator, and the second port is connected with the load;

the transceiver part comprises a transceiver and a dual-polarized transceiving antenna which are in communication connection;

the transceiver transmits a vertical polarization continuous wave signal through the dual-polarization transceiving antenna, the vertical polarization antenna receives the vertical polarization continuous wave signal, the vertical polarization continuous wave signal returns to the circulator after entering a solution to be tested through the circulator and is converted into a horizontal polarization continuous wave signal through the horizontal polarization antenna, the dual-polarization transceiving antenna receives the horizontal polarization continuous wave signal to obtain a power ratio S11 of the horizontal polarization continuous wave signal to the vertical polarization continuous wave signal, and the concentration of the solution to be tested is calculated according to the change of a resonance point S11.

Technical Field

The invention relates to the technical field of solution concentration measurement, in particular to a non-contact solution concentration wireless measurement device.

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 solution components, and the application range is limited. Although the ultrasonic method and the refractive index method can be well used for non-invasive detection, the precision depends on complex processing equipment, the cost is high, and the application frequency range is strongly limited.

Disclosure of Invention

The invention aims to provide a non-contact solution concentration wireless measuring device which can realize wireless measurement and has high sensitivity.

In order to solve the above problems, the present invention provides a wireless noncontact solution concentration measuring device, comprising:

the measuring machine part comprises a vertical polarization antenna, a horizontal polarization antenna and a non-contact measuring device for containing a solution to be measured, wherein the non-contact measuring device comprises a liquid container and a micro-strip defected ground structure, the liquid container is arranged on the micro-strip defected ground structure, the liquid container is provided with a sample inlet and a sample outlet, the micro-strip defected ground structure comprises a micro-strip line and a double-opening gap resonance ring, a first port and a second port are formed at two ends of the micro-strip line respectively, the vertical polarization antenna is connected with the first port, and the vertical polarization antenna is connected with the second port;

the transceiver part comprises a transceiver and a dual-polarized transceiving antenna which are in communication connection;

the transceiver transmits a vertical polarization continuous wave signal through the dual-polarization transceiving antenna, the vertical polarization antenna receives the vertical polarization continuous wave signal, the vertical polarization continuous wave signal is converted into a horizontal polarization continuous wave signal from the horizontal polarization antenna after passing through a solution to be tested, the dual-polarization transceiving antenna receives the horizontal polarization continuous wave signal to obtain a power ratio S21 of the horizontal polarization continuous wave signal to the vertical polarization continuous wave signal, and the concentration of the solution to be tested is calculated according to the change of a resonance point S21.

As a further improvement of the invention, the slot width of the double-opening slot resonance ring is larger than the opening width.

As a further improvement of the invention, the width of the gap of the double-opening gap resonance ring is 0.1-0.5mm, and the width of the opening of the double-opening gap resonance ring is 0.05-0.1 mm.

As a further improvement of the invention, the relation between the power of the horizontally polarized continuous wave signal and the telemetry distance is as follows:

wherein R is the telemetering distance, lambda is the wavelength corresponding to the working frequency, P_tFor the power transmitted by the transceiver, G_tAnd G_rGain values, P, for the transceiver and the measuring machine antennas, respectively_sIs the lowest power at which the measuring machine can operate.

As a further improvement of the invention, the frequency band of the vertically polarized continuous wave signal is 1-2 GHZ.

As a further improvement of the present invention, the width of the microstrip line is greater than the opening width of the dual-opening slot resonant ring.

As a further improvement of the invention, the liquid container is provided with a sample inlet and a sample outlet, and the sample inlet and the sample outlet are symmetrically arranged on two sides of the liquid container.

As a further improvement of the present invention, the characteristic impedance of the microstrip line is 50 ohms.

As a further development of the invention, the liquid container is quartz glass.

The invention also provides a non-contact solution concentration wireless measuring device, which comprises:

the measuring machine part comprises a vertical polarization antenna, a horizontal polarization antenna, a circulator, a load and a non-contact measuring device for containing a solution to be measured, wherein the non-contact measuring device comprises a liquid container and a micro-strip defected ground structure, the liquid container is arranged on the micro-strip defected ground structure, the liquid container is provided with a sample inlet and a sample outlet, the micro-strip defected ground structure comprises a micro-strip line and a double-opening gap resonance ring, the width of the micro-strip line is greater than the opening width of the double-opening gap resonance ring, a first port and a second port are formed at two ends of the micro-strip line respectively, the vertical polarization antenna and the vertical polarization antenna are connected with the first port through the circulator, and the second port is connected with the load;

the transceiver part comprises a transceiver and a dual-polarized transceiving antenna which are in communication connection;

the transceiver transmits a vertical polarization continuous wave signal through the dual-polarization transceiving antenna, the vertical polarization antenna receives the vertical polarization continuous wave signal, the vertical polarization continuous wave signal returns to the circulator after entering a solution to be tested through the circulator and is converted into a horizontal polarization continuous wave signal through the horizontal polarization antenna, the dual-polarization transceiving antenna receives the horizontal polarization continuous wave signal to obtain a power ratio S11 of the horizontal polarization continuous wave signal to the vertical polarization continuous wave signal, and the concentration of the solution to be tested is calculated according to the change of a resonance point S11.

The invention has the beneficial effects that:

the non-contact solution concentration wireless measuring device utilizes the double-opening gap resonant ring structure to detect the solution concentration change, and the precision is higher. The invention can carry out non-contact telemetering measurement on the change of the solution concentration, and has higher sensitivity compared with the traditional microwave non-invasive measurement method.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.

Drawings

FIG. 1 is a schematic structural diagram of a wireless noncontact solution concentration measuring device according to a first preferred embodiment of the present invention;

FIG. 2 is a schematic diagram of the external structure of a non-contact measuring device according to a first preferred embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a microstrip defected ground structure in a first preferred embodiment of the present invention;

FIG. 4 is an equivalent circuit diagram of the non-contact measuring device of the present invention;

FIG. 5 is a schematic structural diagram of a wireless noncontact solution concentration measuring device according to a second preferred embodiment of the present invention;

FIG. 6 is a graph showing the variation of S11 values for glucose solutions of different concentrations in a preferred embodiment of the present invention;

FIG. 7 is a graph showing the variation of the resonance point of S11 for glucose solutions of different concentrations in a preferred embodiment of the present invention;

FIG. 8 is a graph showing the variation of S21 values for glucose solutions of different concentrations in a preferred embodiment of the present invention;

FIG. 9 is a graph showing the variation of the resonance point of S21 for glucose solutions of different concentrations in the preferred embodiment of the present invention.

Description of the labeling: 10. a liquid container; 11. a sample inlet; 12. a sample outlet; 20. a microstrip defected ground structure; 21. a dielectric plate; 22. a microstrip line; 23. double open slot resonating rings.

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.

The dielectric constant ε of the solution concentration can be accurately characterized by the Debye model:

wherein ε' is the real part of the dielectric constant of the solution,. epsilon. "is the imaginary part of the dielectric constant,. epsilon._∞Is the dielectric constant at infinite frequency,. epsilon_sLet τ be the relaxation time of the solution, j be the imaginary unit, and ω be the angular frequency. When the concentration of the solution changes, the parameters and the concentration change present a linear relationship, so the change of the dielectric constant, that is, the change of the concentration of the solution is detected.

Example one

As shown in fig. 1 to 3, a non-contact solution concentration wireless measuring device according to a first embodiment of the present invention includes:

the measuring machine part comprises a vertical polarization antenna, a horizontal polarization antenna and a non-contact measuring device used for containing a solution to be measured, the non-contact measuring device comprises a liquid container 10 and a micro-strip defected ground structure 20, the liquid container 10 is arranged on the micro-strip defected ground structure 20, the liquid container 10 is provided with a sample inlet 11 and a sample outlet 12, the micro-strip defected ground structure 20 comprises a micro-strip line 22 and a double-opening gap resonance ring 23, a first port and a second port are formed at two ends of the micro-strip line 22 respectively, the vertical polarization antenna is connected with the first port, and the vertical polarization antenna is connected with the second port;

the transceiver part comprises a transceiver and a dual-polarized transceiving antenna which are in communication connection;

the transceiver transmits a vertical polarization continuous wave signal through the dual-polarization transceiving antenna, the vertical polarization antenna receives the vertical polarization continuous wave signal, the vertical polarization continuous wave signal is converted into a horizontal polarization continuous wave signal from the horizontal polarization antenna after passing through a solution to be tested, the dual-polarization transceiving antenna receives the horizontal polarization continuous wave signal to obtain a power ratio S21 of the horizontal polarization continuous wave signal to the vertical polarization continuous wave signal, and the concentration of the solution to be tested is calculated according to the change of a resonance point S21. The non-contact solution concentration wireless measuring device further comprises a processor, and the processor is used for calculating and processing the data.

Alternatively, the liquid container 10 is circular, and the radius and wall thickness thereof can be determined according to the requirement. The liquid to be measured enters the container from the sample inlet 11 and flows out from the sample outlet 12, so that an online measuring system is formed.

The equivalent circuit of the non-contact measuring device obtained by the microwave theory is shown in fig. 4. When the concentration of the solution changes, the equivalent capacitance Cs, the inductance Ls and the resistance Rs of the solution all change, and the equivalent capacitance Cr and the inductance Lr of the solution change correspondingly after the size of the gap of the double-opening gap resonance ring changes. Therefore, after the above values are optimized, the reflection of the equivalent circuit at a certain frequency point f in a certain frequency band is minimized, i.e., | S11| is minimized, or the loss is maximized, i.e., | S21| is minimized, and at this time, f is called as a transmission resonance point. At this time, when the solution concentration changes, the equivalent circuit value of the solution to be measured changes, so that the transmission resonance point changes by Δ f, and the change of the solution concentration can be measured through Δ f.

In the present embodiment, the characteristic impedance of the microstrip line 22 is 50 ohms. The microstrip line 22 is etched on the dielectric plate 21, and the width of the microstrip line 22 can be determined according to the dielectric constant of the dielectric plate 21.

As shown in fig. 3, the double-opening slot resonant ring 23 has an inner ring length of Li and an outer ring length of Le (the optimum value is about 0.05 times the operating wavelength).

The slit width s of the double-opening slit resonant ring 23 is greater than the opening width g. Optionally, the gap width s of the dual-opening gap resonance ring 23 is 0.1-0.5mm, and the opening width g of the dual-opening gap resonance ring 23 is 0.05-0.1 mm.

Preferably, the width W of the microstrip line 22 is greater than the opening width g of the double-opening slot resonant ring 23. The sensitivity of the double-open-slot resonant ring 23 is higher as g is smaller relative to W.

Wherein the relationship between the power of the horizontally polarized continuous wave signal and the telemetry distance is as follows:

wherein, R is the telemetry distance, the wavelength corresponding to the working frequency, the power transmitted by the transceiver, and the gain values of the transceiver and the antenna of the measuring machine, respectively, as the lowest power of the measuring machine.

Optionally, the frequency band of the vertically polarized continuous wave signal is 1-2 GHZ.

Optionally, the sample inlet 11 and the sample outlet 12 are symmetrically disposed on two sides of the liquid container 10.

Optionally, the liquid container 10 is quartz glass.

Example two

As shown in fig. 5, a non-contact solution concentration wireless measuring device in the second embodiment of the present invention includes:

the measuring machine part comprises a vertical polarization antenna, a horizontal polarization antenna, a circulator, a load and a non-contact measuring device for containing a solution to be measured, wherein the non-contact measuring device comprises a liquid container 10 and a micro-strip defected ground structure 20, the liquid container 10 is arranged on the micro-strip defected ground structure 20, the liquid container 10 is provided with a sample inlet 11 and a sample outlet 12, the micro-strip defected ground structure 20 comprises a micro-strip line 22 and a double-opening gap resonance ring 23, the width of the micro-strip line 22 is greater than the opening width of the double-opening gap resonance ring 23, a first port and a second port are formed at two ends of the micro-strip line 22 respectively, the vertical polarization antenna and the vertical polarization antenna are connected with the first port through the circulator, and the second port is connected with the load;

the transceiver part comprises a transceiver and a dual-polarized transceiving antenna which are in communication connection;

the transceiver transmits a vertical polarization continuous wave signal through the dual-polarization transceiving antenna, the vertical polarization antenna receives the vertical polarization continuous wave signal, the vertical polarization continuous wave signal returns to the circulator after entering a solution to be tested through the circulator and is converted into a horizontal polarization continuous wave signal through the horizontal polarization antenna, the dual-polarization transceiving antenna receives the horizontal polarization continuous wave signal to obtain a power ratio S11 of the horizontal polarization continuous wave signal to the vertical polarization continuous wave signal, and the concentration of the solution to be tested is calculated according to the change of a resonance point S11. The non-contact solution concentration wireless measuring device further comprises a processor, and the processor is used for calculating and processing the data.

In this embodiment, the load is 50 ohms.

The specific structure and principle of the non-contact measurement apparatus in this embodiment are the same as those in the first embodiment, and are not described herein again.

In one embodiment, the concentration of the glucose solution to be measured is 0, 100, 200, 300, 400, 500mg/dL respectively by using the wireless non-contact solution concentration measuring device of the present invention.

FIG. 6 is a graph showing the variation of S11 values of glucose solutions of different concentrations in a preferred embodiment of the present invention, and it can be seen that the resonance point of S11 occurs at about 1.39GHz when the solution is pure water (0mg/dL), and the resonance point increases as the concentration of glucose in the solution changes. FIG. 7 is a curve showing the variation of the resonance point of S11 for glucose solutions of different concentrations in the preferred embodiment of the present invention, and it can be seen that the measurement sensitivity of the present invention is up to 12MHz/(100mg/dL) on average, and the sensitivity of the present invention is superior to that of the conventional method.

FIG. 8 is a graph showing the variation of S21 value of glucose solutions of different concentrations in the preferred embodiment of the present invention, and it can be seen that the resonance point of S21 occurs at about 1.40GHz when the solution is pure water, and the resonance point increases with the change of the glucose concentration in the solution. FIG. 9 is a graph showing the variation of the resonance point of S21 for glucose solutions of different concentrations in the preferred embodiment of the present invention, and it can be seen that the measurement sensitivity of the present invention is up to 13MHz/(100mg/dL) on average, and the sensitivity of the present invention is superior to that of the conventional method.

The above embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.