CN218726770U - Device and system for detecting concentration of absolute ethyl alcohol based on microwave resonance technology - Google Patents
Device and system for detecting concentration of absolute ethyl alcohol based on microwave resonance technology Download PDFInfo
- Publication number
- CN218726770U CN218726770U CN202222877898.3U CN202222877898U CN218726770U CN 218726770 U CN218726770 U CN 218726770U CN 202222877898 U CN202222877898 U CN 202222877898U CN 218726770 U CN218726770 U CN 218726770U
- Authority
- CN
- China
- Prior art keywords
- resonant cavity
- microwave
- pipeline
- cylindrical
- metal cover
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model provides an absolute ethyl alcohol concentration detection device and system based on microwave resonance technique, relates to an absolute ethyl alcohol concentration check out test set, and the device includes: the liquid which is connected in series in sequence flows into the main trunk, the stirring device, the detection resonant cavity assembly and the outflow main trunk; a third electric control valve is arranged on the liquid inflow main channel; a first electric control valve and a second electric control valve are respectively arranged at two ends of the detection resonant cavity assembly; the detection resonant cavity mechanism comprises an upper pipeline, a lower pipeline, an upper metal cover, a lower metal cover, a cylindrical resonant cavity, a sample cavity, an emission SMA interface, a microwave emission probe, a reception SMA interface and a microwave reception probe. The device has the advantages of small volume, low cost, accurate measurement, high detection speed, easy installation and wide application range.
Description
Technical Field
The utility model relates to an absolute ethyl alcohol concentration detection equipment, concretely relates to absolute ethyl alcohol concentration detection device and system based on microwave resonance technology.
Background
The absolute ethyl alcohol is a common industrial raw material and chemical reagent, and has wide application in the fields of medical treatment and health, food, chemical industry and the like, and the absolute ethyl alcohol with the concentration of more than 99.5 percent can be used as fuel ethyl alcohol and can also be applied to chemical experiments. With the increasing demand of the current social production and life for the anhydrous ethanol, the quality requirement for the anhydrous ethanol also becomes high. Wherein the concentration of absolute ethyl alcohol is one of the important parameters for evaluating the quality of absolute ethyl alcohol. Under the national standard, the concentration of the absolute ethyl alcohol is higher than 99.5 percent, and the concentration of the superior absolute ethyl alcohol is as high as 99.8 percent. If the absolute ethyl alcohol does not meet the quality requirement, the application effect and the experimental result are influenced. Therefore, the online absolute ethyl alcohol concentration detection technology has important significance in industrial production and chemical application, and meanwhile, the detection efficiency can be improved.
Among the conventional methods for detecting the concentration of a liquid, the measurement methods commonly used for detecting the concentration of ethanol mainly include: chemical titration and liquid chromatography. Both methods are off-line sampling to detect ethanol concentration. With the development of the economic and social intelligence, the online detection of the ethanol concentration is required in the actual production and application processes, and the online detection of the ethanol concentration has important significance in industrial production. Meanwhile, with the development of science and technology, more and more liquid concentration detection methods such as a capacitance method, a ray method, an ultrasonic method and a microwave resonance method appear, and the methods can detect the concentration of ethanol on line. The capacitance method realizes the detection of the concentration of the solution according to the characteristic that the change of the dielectric constant of the solution in the capacitor influences the capacitance value, but the detection precision of the method is low; the ray method is to measure the absorption capacity of the solution to rays to obtain the concentration of the solution, but the method has high detection cost and large equipment volume; the ultrasonic method measures acoustic characteristic parameters of different liquids by analyzing the propagation characteristics of ultrasonic waves in a liquid medium, so as to measure the liquid concentration.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an anhydrous alcohol concentration detection device and system based on microwave resonance technique to solve the detection precision that current check out test set exists low, with high costs, detect the complicated, the loaded down with trivial details problem of data processing of parameter.
The utility model discloses a solve the technical scheme that technical problem adopted as follows:
the utility model discloses an anhydrous alcohol concentration detection device based on microwave resonance technique, include: the liquid which is connected in series in sequence flows into the main trunk, the stirring device, the detection resonant cavity assembly and the outflow main trunk; a third electric control valve is arranged on the liquid inflow main channel; a first electric control valve and a second electric control valve are respectively arranged at two ends of the detection resonant cavity assembly;
the detection resonant cavity assembly comprises:
the first electric control valve is arranged on the upper pipeline;
a cylindrical resonant cavity fixedly connected with the upper pipeline;
the second electric control valve is arranged on the lower pipeline, and the outflow main pipeline is connected with the lower pipeline;
a sample cavity disposed in the cylindrical resonant cavity;
the upper metal cover and the lower metal cover are respectively embedded into two ends of the cylindrical resonant cavity, and holes are formed in the upper metal cover and the lower metal cover;
the transmitting SMA interface and the receiving SMA interface are arranged on the cylindrical resonant cavity;
the microwave transmitting probe is arranged at the front end of the transmitting SMA interface and penetrates through the cylindrical resonant cavity to be inserted into the sample cavity;
a microwave receiving probe arranged at the front end of the receiving SMA interface; the microwave receiving probe penetrates through the cylindrical resonant cavity and is inserted into the sample cavity; the microwave transmitting probe and the microwave receiving probe are in orthogonal distribution.
Furthermore, the upper pipeline, the cylindrical resonant cavity and the lower pipeline are all cylinders; the inner radiuses of the upper pipeline, the cylindrical resonant cavity and the lower pipeline are the same; the outer radiuses of the upper pipeline, the cylindrical resonant cavity and the lower pipeline are the same; the upper pipeline, the cylindrical resonant cavity and the lower pipeline are all made of copper materials.
Furthermore, the inner radius of the cylindrical resonant cavity is 9 mm-10 mm, the outer radius is 17 mm-20 mm, and the height is 23 mm-26 mm.
Furthermore, the microwave transmitting probe and the microwave receiving probe are both made of gold-plated materials; the lengths of the microwave transmitting probe and the microwave receiving probe are both 3mm; the radiuses of the microwave transmitting probe and the microwave receiving probe are both 0.25 mm-0.5 mm.
Furthermore, the upper metal cover and the lower metal cover are both made of copper materials; the thicknesses of the upper metal cover and the lower metal cover are both 5 mm-7 mm; the number of the holes on the upper metal cover and the lower metal cover is 5, and the radius of all the holes is 3-3.5 mm; the 5 holes on the upper metal cover are communicated with each other and are distributed in a centrosymmetric way; the 5 holes on the lower metal cover are communicated with each other and the 5 holes are distributed in a central symmetry mode.
Further, an upper pipeline flange is arranged at the lower end of the upper pipeline, a resonant cavity upper flange and a resonant cavity lower flange are respectively arranged at the upper end and the lower end of the cylindrical resonant cavity, and a lower pipeline flange is arranged at the upper end of the lower pipeline; the upper pipeline flange at the lower end of the upper pipeline is fastened with the upper flange of the resonant cavity at the upper end of the cylindrical resonant cavity through screws and nuts, and the lower flange of the resonant cavity at the lower end of the cylindrical resonant cavity is fastened with the lower pipeline flange at the upper end of the lower pipeline through screws and nuts, so that the upper pipeline, the cylindrical resonant cavity and the lower pipeline form a whole which is communicated up and down.
Furthermore, the inner wall of the cylindrical resonant cavity is set to be a smooth surface, and the microwave transmitting probe and the microwave receiving probe do not directly contact with the inner wall of the cylindrical resonant cavity when penetrating through the cylindrical resonant cavity; the microwave transmitting probe and the microwave receiving probe are both positioned at the position with the highest electric field intensity in the cylindrical resonant cavity.
The utility model discloses an anhydrous alcohol concentration detection system based on microwave resonance technology, include an anhydrous alcohol concentration detection device based on microwave resonance technology, still include: the device comprises a microwave emission source, a microwave signal processor, a single chip microcomputer detection unit, a PC end and a high-frequency coaxial line; the rear end of an emission SMA interface in the detection resonant cavity assembly is connected with a microwave emission source through a high-frequency coaxial line, and the rear end of a receiving SMA interface in the detection resonant cavity assembly is connected with a microwave signal processor through a high-frequency coaxial line; the microwave emission source and the microwave signal processor are both connected with the single chip microcomputer detection unit; the single chip microcomputer detection unit is connected with the PC end.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the detection precision is high: proved through the test the utility model discloses can detect thousandth moisture, improve the precision that absolute ethyl alcohol concentration detected.
2. Small volume and low cost: the utility model discloses the whole volume of detection resonant cavity mechanism that adopts is less, and cylindrical resonant cavity size is little, and cylindrical resonant cavity inserts as a part of pipeline, does not have the influence to whole transmission line pipeline fluid, has advantages such as small, the integrated equipment of being convenient for, easily installation, can solve current check out test set volume too big, the loaded down with trivial details problem is dismantled in the installation.
3. The utility model discloses it is fast to detect, only needs several minutes can accomplish, has improved data processing speed.
4. The utility model discloses can not only detect anhydrous alcohol concentration, can also be used for detecting other organic matter concentrations of dissolving in water, application scope is extensive, and detection range is wide.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is the structural schematic diagram of the absolute ethyl alcohol concentration detection device based on the microwave resonance technology of the present invention.
Fig. 2 is a schematic structural diagram of a detection resonant cavity mechanism.
FIG. 3 is a top view of the interior of the detection cavity mechanism.
Fig. 4 is a block diagram of the absolute ethyl alcohol concentration detection system based on the microwave resonance technology.
FIG. 5 is a graph of simulated resonance curves for absolute ethanol concentrations of 99.5%, 99.6%, 99.7%, 99.8%, 99.9%, and 100%.
In the figure: 1. the device comprises a microwave emission source, 2, a detection resonant cavity mechanism, 3, a microwave signal processor, 4, a single chip microcomputer detection unit, 5, a PC end, 6, a high-frequency coaxial line, 7, a screw, 8, an upper pipeline, 9, a lower pipeline, 10, a lower metal cover, 11, an upper metal cover, 12, a cylindrical resonant cavity, 13, a sample cavity, 14, a transmission SMA interface, 15, a microwave transmission probe, 16, a reception SMA interface, 17, a microwave reception probe, 18, a nut, 19, a stirring device, 20, a first electric control valve, 21, a second electric control valve, 22, a liquid inflow trunk channel, 23, an outflow trunk channel, 24 and a third electric control valve.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the utility model discloses an anhydrous alcohol concentration detection device based on microwave resonance technology mainly includes: the device comprises a detection resonant cavity mechanism 2, a stirring device 19, a first electronic control valve 20, a second electronic control valve 21, a liquid inflow main channel 22, a liquid outflow main channel 23 and a third electronic control valve 24. The liquid inflow main trunk 22 is provided with a third electric control valve 24, the liquid inflow main trunk 22 is connected with a liquid inlet of the stirring device 19, the liquid outlet of the stirring device 19 is connected with one end of the detection resonant cavity mechanism 2 through a pipeline and the first electric control valve 20, and the other end of the detection resonant cavity mechanism 2 is connected with the outflow main trunk 23 through a pipeline and the second electric control valve 21.
As shown in fig. 2 and 3, the detection cavity mechanism 2 mainly includes: the device comprises a screw 7, an upper pipeline 8, a lower pipeline 9, a lower metal cover 10, an upper metal cover 11, a cylindrical resonant cavity 12, a sample cavity 13, a transmitting SMA interface 14, a microwave transmitting probe 15, a receiving SMA interface 16, a microwave receiving probe 17 and a nut 18.
The upper end of the upper pipeline 8 is connected with a liquid outlet of the stirring device 19, and a first electric control valve 20 is arranged on the upper pipeline 8; the lower end of the lower pipeline 9 is connected with an outflow main pipeline 23, and a second electric control valve 21 is arranged on the lower pipeline 9; an upper pipeline flange 801 is arranged at the lower end of the upper pipeline 8, a resonant cavity upper flange 250 and a resonant cavity lower flange 251 are respectively arranged at the upper end and the lower end of the cylindrical resonant cavity 12, and a lower pipeline flange 901 is arranged at the upper end of the lower pipeline 9, wherein the upper pipeline flange 801 at the lower end of the upper pipeline 8 is fastened with the resonant cavity upper flange 250 at the upper end of the cylindrical resonant cavity 12 through a screw 7 and a nut 18, and the resonant cavity lower flange 251 at the lower end of the cylindrical resonant cavity 12 is fastened with the lower pipeline flange 901 at the upper end of the lower pipeline 9 through a screw 7 and a nut 18, so that the upper pipeline 8, the cylindrical resonant cavity 12 and the lower pipeline 9 form a whole body which is communicated up and down.
A sample cavity 13 is arranged inside the cylindrical resonant cavity 12, and the sample cavity 13 is used for containing a sample to be measured. The volume of the stirring chamber in the stirring device 19 should be much larger than the volume of the sample chamber 13, so as to ensure that the liquid flowing through the sample chamber 13 is uniformly distributed during the detection process.
The upper metal cover 11 is embedded into the upper end of the cylindrical resonant cavity 12, the lower metal cover 10 is embedded into the lower end of the cylindrical resonant cavity 12, and the upper metal cover 11 and the lower metal cover 10 are respectively positioned at the upper end and the lower end of the sample cavity 13; all be provided with the hole of the same quantity, the same specification and the same mode of arrangement on last metal covering 11 and the metal covering 10 down, all be provided with 5 circular through-holes that become central symmetric distribution on last metal covering 11 and the metal covering 10 down promptly, 1 circular through-hole sets up at last metal covering 11 center, and other 4 circular through-hole equipartitions are in the circular through-hole outer lane in center, and these 4 circular through-holes all are linked together with the circular through-hole in center, as shown in fig. 2.
The microwave emission probe 15 is installed at the front end of the emission SMA interface 14, the front end of the emission SMA interface 14 extends into the cylindrical resonant cavity 12 from outside to inside, and the microwave emission probe 15 penetrates through the cylindrical resonant cavity 12 and is inserted into the sample cavity 13; the microwave receiving probe 17 is installed at the front end of the receiving SMA interface 16, the front end of the receiving SMA interface 16 extends into the cylindrical resonant cavity 12 from outside to inside, and the microwave receiving probe 17 penetrates through the cylindrical resonant cavity 12 to be inserted into the sample cavity 13. Since the inner wall of the cylindrical cavity 12 is extremely smooth, the microwave transmitting probe 15 and the microwave receiving probe 17 do not directly contact the inner wall of the cylindrical cavity 12 when passing through the cylindrical cavity 12. The microwave transmitting probe 15 is used for realizing the transmission of microwave signals, and the microwave receiving probe 17 is used for realizing the reception of microwave signals. The microwave transmitting probe 15 and the microwave receiving probe 17 are both located at the place where the electric field intensity is the strongest in the cylindrical resonant cavity 12, and the microwave transmitting probe 15 and the microwave receiving probe 17 are in orthogonal distribution.
In the utility model, the upper pipeline 8, the cylindrical resonant cavity 12 and the lower pipeline 9 are all cylinders, and the inner radius and the outer radius of the cylinders are the same, namely the inner radius is 9 mm-10 mm, and the outer radius is 17 mm-20 mm; the upper pipe 8, the cylindrical resonant cavity 12 and the lower pipe 9 are all made of copper materials.
In the utility model, the height of the cylindrical resonant cavity 12 is 23 mm-26 mm.
The utility model discloses in, the material of microwave emission probe 15 and microwave receiving probe 17 all adopts the gilding material, and length is 3mm, and the radius is 0.25mm ~ 0.5mm.
The utility model discloses in, the material of going up metal covering 11 and metal covering 10 down all adopts the copper product matter, and thickness is 5mm ~ 7mm.
The utility model discloses in, respectively set up 5 circular through-holes on last metal covering 11 and the lower metal covering 10, the radius of these circular through-holes is 3mm ~ 3.5mm.
In the present invention, the stirring device 19 is preferably an ultrasonic stirring device of AUTOSCIENCE AS-7240B, but not limited thereto.
The utility model discloses a simulation design and the whole structure and the size that detect resonant cavity mechanism 2 of optimization adjustment to and the material of probe position and each part is selected, makes the detection resonant cavity mechanism 2 that best accords with the high accuracy and detect, thereby realizes the purpose that high accuracy and wide range detected, makes its resonant frequency's offset more better.
As shown in fig. 4, the utility model discloses an anhydrous alcohol concentration detection system based on microwave resonance technology adopts foretell anhydrous alcohol concentration detection device based on microwave resonance technology to realize, specifically includes: the device comprises a detection device, a microwave emission source 1, a microwave signal processor 3, a singlechip detection unit 4, a PC end 5 and a high-frequency coaxial line 6; in the detection device, the rear end of an emission SMA interface 14 in a detection resonant cavity mechanism 2 is connected with a microwave emission source 1 through a high-frequency coaxial line 6, and the rear end of a receiving SMA interface 16 in the detection resonant cavity mechanism 2 is connected with a microwave signal processor 3 through the high-frequency coaxial line 6; the microwave emission source 1 and the microwave signal processor 3 are both connected with the single chip microcomputer detection unit 4; the single chip microcomputer detection unit 4 is connected with the PC end 5; the microwave emission source 1 emits high-frequency electromagnetic waves, the high-frequency electromagnetic waves are fed through the high-frequency coaxial line 6 and the microwave emission probe 15 to be transmitted into the cylindrical resonant cavity 12, the high-frequency electromagnetic waves oscillate back and forth in the cylindrical resonant cavity 12, when the wavelength of the input high-frequency electromagnetic waves is matched with the size of the cylindrical resonant cavity 12, a resonance phenomenon occurs, and at the moment, the energy stored in the cylindrical resonant cavity 12 is maximum; the microwave receiving probe 17 transmits the received high-frequency electromagnetic wave to the microwave signal processor 3 through the high-frequency coaxial line 6, and outputs a microwave signal after being detected by the microwave signal processor 3; meanwhile, the single chip microcomputer detection unit 4 measures the high-frequency electromagnetic wave frequency signal emitted by the microwave emission source 1 and the microwave signal output by the microwave signal processor 3, and the acquisition and data processing of each detection parameter are realized through the single chip microcomputer detection unit 4.
In the present invention, the microwave emitting source 1 may preferably be a broadband microwave source, but is not limited thereto.
In the present invention, the microwave signal processor 3 may preferably employ a detector, but is not limited thereto.
Utilize the utility model discloses an absolute ethyl alcohol concentration detection system carries out on-line measuring time measuring to absolute ethyl alcohol concentration based on microwave resonance technology, its concrete step as follows:
opening the third electric control valve 24, closing the first electric control valve 20 at the same time, allowing the detected anhydrous ethanol to flow into the stirring cavity of the stirring device 19 from the liquid inflow main trunk 22, and stirring the detected anhydrous ethanol by using the stirring device 19 to ensure that the detected anhydrous ethanol is uniformly distributed; then, opening the first electronic control valve 20, and simultaneously closing the third electronic control valve 24, so that the detected anhydrous ethanol flows into the cylindrical resonant cavity 12 of the detection resonant cavity mechanism 2 from the stirring cavity of the stirring device 19, and since the cylindrical resonant cavity 12 is an open cylindrical resonant cavity, the detected anhydrous ethanol can flow from the upper pipeline 8 to the lower pipeline 9 through the sample cavity 13;
the microwave emission source 1 emits high-frequency electromagnetic waves, the high-frequency electromagnetic waves are fed through the high-frequency coaxial line 6 and the microwave emission probe 15 to be transmitted into the cylindrical resonant cavity 12, the high-frequency electromagnetic waves oscillate back and forth in the cylindrical resonant cavity 12, when the wavelength of the input high-frequency electromagnetic waves is matched with the size of the cylindrical resonant cavity 12, a resonance phenomenon can occur, and at the moment, the energy stored in the cylindrical resonant cavity 12 is maximum; the microwave receiving probe 17 transmits the received high-frequency electromagnetic wave to the microwave signal processor 3 through the high-frequency coaxial line 6, and outputs a microwave signal after being detected by the microwave signal processor 3; meanwhile, the single chip microcomputer detection unit 4 measures the high-frequency electromagnetic wave frequency signal emitted by the microwave emission source 1 and the microwave signal output by the microwave signal processor 3, and the acquisition and data processing of each detection parameter are realized through the single chip microcomputer detection unit 4. The single chip microcomputer detection unit 4 performs data processing on the received high-frequency electromagnetic wave frequency signal to obtain the resonant frequency of the cylindrical resonant cavity 12, the single chip microcomputer detection unit 4 performs data processing on the received microwave signal output by the microwave signal processor 3 to obtain the microwave power of the cylindrical resonant cavity 12, and the concentration of the absolute ethyl alcohol is calculated by utilizing the parameters; the detection parameters and the calculation result can be displayed through the PC terminal 5.
The dielectric constant of the measured liquid can be obtained according to the existing resonant cavity perturbation method. If there is a small dielectric perturbation (small change in the concentration of the liquid in the sample chamber 13) and the actual field is not significantly different from the original field, the resulting change in the resonant frequency can be expressed by equation (1):
in the formula (f) 1 、f 2 Respectively the resonance frequencies before and after disturbance; epsilon and mu are respectively the dielectric constant and the magnetic conductivity of the liquid to be measured in the undisturbed sample cavity 13; i E 1 I and I H 1 I is the original electric field intensity and magnetic field intensity respectively; v c Is the volume of the sample chamber 13;Δ ε and Δ μ are the changes in permittivity and permeability, respectively, within the sample chamber 13.
Because cylindrical cavity 12 will be higher than the Q value of rectangle cavity, the bandwidth will be narrow relatively, consequently, the utility model discloses in adopt cylindrical cavity 12 can further improve the detection precision. The utility model discloses in, cylindrical cavity 12's mode of operation is TE011 mode, and TE011 mode is the high order mode in the cylindrical cavity, compares with other modes, and under the same output, the heat loss of TE011 mode is minimum. Therefore, the resonance wavelength at the TE011 mode in the cylindrical resonant cavity 12 can be represented by formula (2):
λ＝1.64R (2)
where λ is the resonant wavelength of the cylindrical resonant cavity 12 and R is the inner radius of the cylindrical resonant cavity 12.
The resonant frequency of the cylindrical resonant cavity 12 in the TE011 mode can be represented by formula (3):
wherein c is the speed of light in vacuum,. Epsilon r Dielectric constant of the liquid to be measured, mu r Is magnetic permeability.
The formula (4) can be obtained by combining the formula (1), the formula (2) and the formula (3):
and (3) obtaining a relation (6) of the resonant frequency f and the measured liquid concentration beta according to the formula (4) and a mixed dielectric constant formula, namely the Bluggeman formula (5).
In the formula, epsilon water Is the dielectric constant of water,. Epsilon alcohol Is the dielectric constant of alcohol,. Epsilon mix Is the dielectric constant of the mixture.
Application examples
Utilize according to above-mentioned method the utility model discloses an absolute ethyl alcohol concentration detection system carries out on-line measuring to absolute ethyl alcohol concentration based on microwave resonance technology. Firstly, absolute ethyl alcohol (without water) is added into a sample cavity 13 of the cylindrical resonant cavity 12 for detection, and the corresponding resonant frequency f is read through the PC end 5 o (ii) a Then, absolute ethyl alcohol with different concentrations is added for detection, and the corresponding resonance frequency is read through the PC end 5.
In order to measure the concentration of the absolute ethyl alcohol, the absolute ethyl alcohol with different concentrations is prepared for testing on the basis of the standard that the concentration of the absolute ethyl alcohol is qualified:
sample 1: ethanol with a concentration of 99.9%;
sample 2: ethanol with a concentration of 99.8%;
sample 3: ethanol with a concentration of 99.7%;
sample 4: ethanol with a concentration of 99.6%;
sample 5: absolute ethyl alcohol with a concentration of 99.5%.
The 5 samples are respectively added into the sample cavity 13 of the cylindrical resonant cavity 12, and the resonant frequency f of each sample can be respectively read at the PC end 5 1 、f 2 、f 3 、f 4 、f 5 (ii) a And (4) according to the resonant frequency values of the ethanol with different concentrations, calculating by using the formulas (4), (5) and (6) to obtain the concentration of the detected absolute ethanol.
Absolute ethyl alcohol with the purity higher than 99.9 percent is used as a calibration value, and the resonance frequency of the detected sample is f 0 =4.9019GHz (curve a in fig. 5); according to simulation experiments, the detection accuracy of the cylindrical resonant cavity 12 is 0.1%, namely, every time the concentration of the absolute ethyl alcohol changes by 0.1%, the frequency change value is about Δ f =30 MHz.
The above test results are shown in fig. 5:
when a sample 1 is added to the sample cavity 13 of the cylindrical resonant cavity 12, the corresponding resonanceVibration frequency f 1 =4.8979GHz (curve b in fig. 5), the concentration of sample 1 was calculated to be 99.9%;
when a sample 2 is added to the sample cavity 13 of the cylindrical resonant cavity 12, the corresponding resonant frequency f 2 =4.8949GHz (curve c in fig. 5), the concentration of sample 1 was calculated to be 99.8%;
when a sample 3 is added to the sample cavity 13 of the cylindrical resonant cavity 12, the corresponding resonant frequency f 3 =4.8919GHz (curve d in fig. 5), the concentration of sample 1 was calculated to be 99.7%.
When a sample 4 is added to the sample cavity 13 of the cylindrical resonant cavity 12, the corresponding resonant frequency f 4 =4.8889GHz (curve e in fig. 5), the concentration of sample 1 was calculated to be 99.6%.
When a sample 5 is added to the sample cavity 13 of the cylindrical resonant cavity 12, the corresponding resonant frequency f 5 =4.8859GHz (curve f in fig. 5), the concentration of sample 1 was calculated to be 99.5%.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. The utility model provides an anhydrous alcohol concentration detection device based on microwave resonance technique which characterized in that includes: the liquid which is connected in series in sequence flows into the main trunk, the stirring device, the detection resonant cavity assembly and the outflow main trunk; a third electric control valve is arranged on the liquid inflow main channel; a first electric control valve and a second electric control valve are respectively arranged at two ends of the detection resonant cavity assembly;
the detection resonant cavity assembly comprises:
the first electric control valve is arranged on the upper pipeline;
a cylindrical resonant cavity fixedly connected with the upper pipeline;
the second electric control valve is arranged on the lower pipeline, and the outflow main pipeline is connected with the lower pipeline;
a sample cavity disposed in the cylindrical resonant cavity;
the upper metal cover and the lower metal cover are respectively embedded into two ends of the cylindrical resonant cavity, and holes are formed in the upper metal cover and the lower metal cover;
the transmitting SMA interface and the receiving SMA interface are arranged on the cylindrical resonant cavity;
the microwave transmitting probe is arranged at the front end of the transmitting SMA interface and penetrates through the cylindrical resonant cavity to be inserted into the sample cavity;
a microwave receiving probe arranged at the front end of the receiving SMA interface; the microwave receiving probe penetrates through the cylindrical resonant cavity and is inserted into the sample cavity; the microwave transmitting probe and the microwave receiving probe are in orthogonal distribution.
2. The absolute ethyl alcohol concentration detection device based on the microwave resonance technology as claimed in claim 1, wherein the upper pipeline, the cylindrical resonant cavity and the lower pipeline are all cylinders; the inner radiuses of the upper pipeline, the cylindrical resonant cavity and the lower pipeline are the same; the outer radiuses of the upper pipeline, the cylindrical resonant cavity and the lower pipeline are the same; the upper pipeline, the cylindrical resonant cavity and the lower pipeline are all made of copper materials.
3. The device for detecting the concentration of absolute ethyl alcohol based on the microwave resonance technology as claimed in claim 2, wherein the cylindrical resonant cavity has an inner radius of 9mm to 10mm, an outer radius of 17mm to 20mm, and a height of 23mm to 26mm.
4. The absolute ethyl alcohol concentration detection device based on the microwave resonance technology as claimed in claim 1, wherein the microwave transmitting probe and the microwave receiving probe are made of gold-plated materials; the lengths of the microwave transmitting probe and the microwave receiving probe are both 3mm; the radiuses of the microwave transmitting probe and the microwave receiving probe are both 0.25 mm-0.5 mm.
5. The absolute ethyl alcohol concentration detection device based on the microwave resonance technology as claimed in claim 1, wherein the upper metal cover and the lower metal cover are both made of copper material; the thicknesses of the upper metal cover and the lower metal cover are both 5 mm-7 mm; the number of the holes on the upper metal cover and the lower metal cover is 5, and the radius of all the holes is 3-3.5 mm; the 5 holes on the upper metal cover are communicated with each other and are distributed in a centrosymmetric way; the 5 holes on the lower metal cover are communicated with each other and are distributed in a central symmetry way.
6. The absolute ethanol concentration detection device based on the microwave resonance technology as claimed in claim 1, wherein an upper pipe flange is arranged at the lower end of the upper pipe, a resonant cavity upper flange and a resonant cavity lower flange are respectively arranged at the upper end and the lower end of the cylindrical resonant cavity, and a lower pipe flange is arranged at the upper end of the lower pipe; the upper pipeline flange at the lower end of the upper pipeline is fastened with the upper flange of the resonant cavity at the upper end of the cylindrical resonant cavity through screws and nuts, and the lower flange of the resonant cavity at the lower end of the cylindrical resonant cavity is fastened with the lower pipeline flange at the upper end of the lower pipeline through screws and nuts, so that the upper pipeline, the cylindrical resonant cavity and the lower pipeline form a whole which is communicated up and down.
7. The absolute ethyl alcohol concentration detection device based on the microwave resonance technology as claimed in claim 1, wherein the inner wall of the cylindrical resonant cavity is provided with a smooth surface, and the microwave transmitting probe and the microwave receiving probe do not directly contact with the inner wall of the cylindrical resonant cavity when passing through the cylindrical resonant cavity; the microwave transmitting probe and the microwave receiving probe are both positioned at the position with the highest electric field intensity in the cylindrical resonant cavity.
8. An absolute ethanol concentration detection system based on microwave resonance technology, characterized in that, it comprises an absolute ethanol concentration detection device based on microwave resonance technology of any one of claims 1-7, and it also comprises: the device comprises a microwave emission source, a microwave signal processor, a single chip microcomputer detection unit, a PC (personal computer) end and a high-frequency coaxial line; the rear end of an emission SMA interface in the detection resonant cavity assembly is connected with a microwave emission source through a high-frequency coaxial line, and the rear end of a receiving SMA interface in the detection resonant cavity assembly is connected with a microwave signal processor through a high-frequency coaxial line; the microwave emission source and the microwave signal processor are both connected with the single chip microcomputer detection unit; the single chip microcomputer detection unit is connected with the PC end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222877898.3U CN218726770U (en) | 2022-10-31 | 2022-10-31 | Device and system for detecting concentration of absolute ethyl alcohol based on microwave resonance technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222877898.3U CN218726770U (en) | 2022-10-31 | 2022-10-31 | Device and system for detecting concentration of absolute ethyl alcohol based on microwave resonance technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218726770U true CN218726770U (en) | 2023-03-24 |
Family
ID=85594734
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222877898.3U Active CN218726770U (en) | 2022-10-31 | 2022-10-31 | Device and system for detecting concentration of absolute ethyl alcohol based on microwave resonance technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218726770U (en) |
-
2022
- 2022-10-31 CN CN202222877898.3U patent/CN218726770U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Gennarelli et al. | A microwave resonant sensor for concentration measurements of liquid solutions | |
| Gregory et al. | A review of RF and microwave techniques for dielectric measurements on polar liquids | |
| Folgero et al. | A broad-band and high-sensitivity dielectric spectroscopy measurement system for quality determination of low-permittivity fluids | |
| CN111856148B (en) | High-sensitivity microwave sensor for measuring dielectric constant of liquid | |
| CN102590230A (en) | Microwave resonant cavity sensor and measurement system for measuring concentration of solution | |
| Otto et al. | Improved calibration of a large open-ended coaxial probe for dielectric measurements | |
| CN111912885A (en) | Water content monitoring device and method | |
| Kaatze et al. | A new automated waveguide system for the precise measurement of complex permittivity of low-to-high-loss liquids at microwave frequencies | |
| CN109613026B (en) | Device for detecting water content of granular solid sample by utilizing microwave | |
| CN108169573A (en) | Small sample dielectric property detection device based on microchannel electric-field enhancing | |
| CN111948462B (en) | Coaxial structure broadband quantum microwave measuring device and method | |
| US5256978A (en) | Microwave moisture content analyzer | |
| CN218726770U (en) | Device and system for detecting concentration of absolute ethyl alcohol based on microwave resonance technology | |
| CN109959668A (en) | A kind of microwave remote sensor, microwave signal process system and detection method | |
| CN100412531C (en) | Microwave pottery materials fast detection device and method | |
| CN110398636A (en) | Liquid dielectric Sensors & Application based on miniaturization medium resonator antenna | |
| Skresanov et al. | Improved differential Ka band dielectrometer based on the wave propagation in a quartz cylinder surrounded by high loss liquid under test | |
| CN210294108U (en) | Microwave sensor and microwave signal processing system | |
| CN112014461A (en) | Detection system and method for multi-index analysis of milk | |
| Meyne et al. | Corrugated coplanar transmission-line sensor for broadband liquid sample characterization | |
| CN114002237A (en) | Microwave technology-based oil water content online detection system and detection method thereof | |
| CN105203564A (en) | Device and method for detecting trace water in oil by using microwaves | |
| Nacke et al. | Application of high frequency sensors for contactless monitoring in disposable bioreactors | |
| Wei et al. | Void fraction measurement using the coaxial line phase sensor in the vertical gas-liquid slug flow | |
| CN112268913B (en) | Oil-gas-water three-phase flow microwave water holding rate measuring method capable of eliminating influence of water mineralization degree |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |