Dual-coaxial microstrip antenna sensing system for measuring related speed of horizontal oil-water two-phase flow

Abstract

The invention relates to a dual-coaxial microstrip antenna sensing system for measuring the related speed of a horizontal oil-water two-phase flow, which comprises a test pipeline, a central insertion body and two coaxial microstrip antenna sensors which are respectively fixed at the upstream and the downstream of the test pipeline and have the same structure, the coaxial microstrip antenna sensor comprises a receiving microstrip antenna tightly attached to the outside of the test pipeline and a transmitting microstrip antenna installed in the center insertion body, the receiving microstrip antenna comprises a receiving antenna grounding polar plate, a receiving antenna radiation polar plate and a receiving antenna port, and the receiving antenna grounding polar plate and the receiving antenna radiation polar plate are coaxial; the receiving antenna grounding polar plate is positioned on the outer side of the receiving antenna radiation polar plate; the transmitting microstrip antenna comprises a transmitting antenna radiation polar plate, a transmitting antenna grounding polar plate and a transmitting antenna port, the transmitting antenna grounding polar plate and the receiving antenna radiation polar plate are coaxial, and the transmitting antenna grounding polar plate is located on the inner side of the transmitting antenna radiation polar plate. The method can meet the requirement for high-precision flow velocity detection under a complex flow pattern.

Description

Technical Field

[0001] This invention relates to a horizontal oil-water two-phase flow velocity measurement device in the field of industrial fluid measurement technology. Background Technology

[0002] Horizontal oil-water two-phase flow is widely used in oil extraction, chemical production, and environmental monitoring. Accurate measurement of its flow parameters is crucial for optimizing process flow and improving resource utilization. Due to gravity, oil-water two-phase flow in horizontal pipelines easily forms complex flow patterns such as stratified flow and dispersed flow, resulting in uneven velocity distribution. Traditional measurement methods, such as turbine flow meters and differential pressure flow meters, are difficult to accurately capture local velocity changes.

[0003] Existing microwave sensors mostly employ single-point or array designs. While they can indirectly reflect water-holding capacity through changes in dielectric constant, their ability to directly measure flow velocity is limited. The inventors' prior patent application CN120195239A provides a coaxial microstrip antenna structure for water-holding capacity measurement. This insert design acts as a flow collector, contributing to the standardization of fluid flow structures. Furthermore, the strong electric field in the annular space lays the foundation for designing a velocity sensor based on this structure. Cross-correlation velocimetry calculates flow velocity by analyzing the time delay between upstream and downstream sensor signals. However, existing sensor designs suffer from poor structural adaptability, weak anti-interference capabilities, high flow pattern sensitivity, and difficulty in full-range measurement. For example, the inventors' dissertation, "Research on Microwave Sensor Flow Measurement Method for Inclined Oil-Water Two-Phase Flow," proposes a non-contact dual-ring microwave sensor. However, the electric field strength gradually weakens from the inner wall of the pipe to the center, resulting in reduced sensitivity at the center, which is unfavorable for velocity measurement of complex fluids in horizontal pipes. Therefore, developing a sensor that adapts to horizontal flow fields, is anti-interference, and can stably measure total flow velocity across the entire range is of significant engineering importance. Summary of the Invention

[0004] The purpose of this invention is to provide a dual-coaxial microstrip antenna sensing system for measuring the correlation velocity of horizontal oil-water two-phase flow, used for correlation velocity measurement under complex flow patterns. The specific technical solution is as follows: A dual-coaxial microstrip antenna sensing system for measuring the correlation velocity of horizontal oil-water two-phase flow is characterized by comprising a test pipe 4 made of insulating material, a central insert 9, and two identical coaxial microstrip antenna sensors fixed upstream and downstream of the test pipe 4, respectively. The central insert 9 is coaxial with the test pipe 4. The coaxial microstrip antenna sensors include a receiving microstrip antenna attached to the outside of the test pipe 4 and a transmitting microstrip antenna installed inside the central insert 9. The receiving microstrip antenna includes a receiving antenna ground plate 2, a receiving antenna radiating plate 3, and a receiving antenna port 1. The receiving antenna ground plate 2 is located outside the receiving antenna radiating plate 3. The transmitting microstrip antenna... The microstrip antenna includes a transmitting antenna radiating plate 6, a transmitting antenna grounding plate 7, and a transmitting antenna port 8. The transmitting antenna grounding plate 7 is located inside the transmitting antenna radiating plate 6. The four plates—receiving antenna grounding plate 2, receiving antenna radiating plate 3, transmitting antenna grounding plate 7, and transmitting antenna radiating plate 6—are coaxial. The two grounding plates of the coaxial microstrip antenna sensor have equal lengths, and the two radiating plates also have equal lengths. The ratio of the length of the radiating plate to the length of the grounding plate is between 1 / 18 and 1 / 14. The ratio of the length of the radiating plate to the distance between the two coaxial microstrip antenna sensors located upstream and downstream is between 1 / 35 and 1 / 25.

[0005] Furthermore, the ratio of the length of the radiating electrode to the length of the grounding electrode is 1 / 16.

[0006] Furthermore, the length of the radiating plate is 1 / 30 of the distance between the two coaxial microstrip antenna sensors located upstream and downstream, respectively.

[0007] Furthermore, flow pattern simulation was used to optimize the parameters of the radiating plate length. Stratified flow was selected as the simulation object, and the water holding capacity was changed by altering the height of the water layer to establish a stratified flow simulation model.

[0008] Furthermore, during the simulation, the range of variation of the radiating plate length and the range of variation of the water holding rate were set. For different radiating plate lengths, the mean and standard deviation of the response were calculated based on the phase shift caused by the change in water holding rate. The response characteristics under the change in water holding rate were analyzed to evaluate the sensitivity and measurement stability of the coaxial microstrip antenna sensor and determine the optimized parameters of the radiating plate.

[0009] Furthermore, the electric field distribution of the sensor and its response signal to changes in the medium were simulated under different grounding plate lengths and radiating plate lengths. The optimal parameter combination of the coaxial microstrip antenna sensor was determined through field strength and sensitivity analysis.

[0010] Furthermore, the test pipe was made of acrylic material.

[0011] Furthermore, the central insert is made of resin.

[0012] Because of the above technical solutions, this invention has the following measurement advantages: (1) The coaxial design of the present invention forms a stable signal transmission structure by coaxially arranging the inner and outer microstrip antennas, reducing external electromagnetic interference and improving measurement stability.

[0013] (2) By optimizing the length of the grounding plate and the radiation plate through simulation, the sensor’s sensitivity to changes in water holding capacity and measurement consistency are significantly improved while ensuring the independence of the electromagnetic field, thus meeting the high-precision flow velocity detection requirements under complex flow patterns.

[0014] (3) By combining cross-correlation algorithm to analyze the phase delay of upstream and downstream sensors, it can accurately capture the local motion characteristics of fluid, has strong anti-interference ability, high time resolution, and exhibits excellent velocity measurement repeatability and reliability in different flow patterns and flow ranges. Attached Figure Description

[0015] Figure 1 This is a structural diagram of a dual coaxial microstrip antenna sensing system.

[0016] Figure 2 The structure is a coaxial microstrip antenna sensor: (a) and (b) are the side view and cross-sectional view of the coaxial microstrip antenna sensor structure, respectively.

[0017] Figure 3 The electric field distribution under different grounding electrode lengths: (a), (b), and (c) represent the electric field distribution under different grounding electrode lengths. l = 240mm l = 200 mm l Electric field distribution at 160 mm.

[0018] Figure 4 It is a layered flow simulation model.

[0019] Figure 5 It represents the mean and standard deviation of the sensor's response to changes in water holding capacity under different radiating electrode lengths.

[0020] Figure 6 This is a schematic diagram of the oil plug movement.

[0021] Figure 7 It is the phase response of the upstream and downstream sensors when the oil plug passes through.

[0022] Figure 8 The following are the calculation results of the output signals and cross-correlation functions of the dual coaxial microstrip antenna sensing system corresponding to the six flow patterns: (a) ST, Q m =15m 3 / d, Kw =50%; (b) ST&MI, Q m =35m 3 / d, K w =50%; (c) DW / O&DO / W, Q m =50m 3 / d, K w =60%; (d) DO / W&W, Q m =35m 3 / d, K w =85%; (e) DO / W, Q m =45m 3 / d, K w =90%; (f)DW / O, Q m =55m 3 / d, K w =15%. Among them, Q m For total flow and K w This refers to the moisture content.

[0023] Figure 9 These are the results of velocity calculations related to horizontal oil-water two-phase flow.

[0024] Figure 10 This is a schematic diagram of a microwave sensor measurement system.

[0025] Explanation of icon numbers: 1. Receiving antenna port; 2. Receiving antenna grounding plate; 3. Receiving antenna radiating plate; 4. Test pipe; 5. Fluid flow area; 6. Transmitting antenna radiating plate; 7. Transmitting antenna grounding plate; 8. Transmitting antenna port; 9. Center insert. Detailed Implementation

[0026] This invention aims to design a dual-coaxial microstrip antenna sensing system to measure the correlation velocity of horizontal oil-water two-phase flow. By detecting the phase information of upstream and downstream sensors, the correlation velocity under different operating conditions is obtained through cross-correlation. The specific implementation process of the method is described below with reference to the accompanying drawings: (1) The structure of the dual coaxial microstrip antenna sensing system is as follows: Figure 1As shown, the test includes two sensors: an upstream sensor and a downstream sensor, installed upstream and downstream of the test pipe respectively, with a fixed spacing of 300 mm. Both the upstream and downstream sensors have identical structures, being coaxial microstrip antenna sensors, belonging to the microwave sensor category. The two microstrip antennas are coaxially arranged inside and outside the test pipe, forming a stable signal transmission structure (e.g., ...). Figure 2 As shown in the figure, the test pipe is made of acrylic material with an outer radius of 15mm and an inner radius of 10mm. A central insert 9, coaxial with the test pipe, is installed in the middle of the test pipe, forming an annular fluid flow area 5 around the central insert 9. The coaxial microstrip antenna sensor structure includes a receiving microstrip antenna attached to the outer wall of the test pipe: receiving antenna port 1, receiving antenna grounding plate 2, and receiving antenna radiating plate 3; and a transmitting microstrip antenna embedded in the central insert 9 within the test pipe: transmitting antenna radiating plate 6, transmitting antenna grounding plate 7, and transmitting antenna port 8. The transmitting microstrip antenna is responsible for transmitting microwave signals, while the receiving microstrip antenna installed outside the test pipe is used to receive microwave signals. To reduce the influence of the fluid environment on sensor performance, the transmitting microstrip antenna is encapsulated in the central insert 9 made of polyethylene (PE) resin material, thereby avoiding direct contact with the fluid and effectively reducing interference caused by particulate matter deposition and oil droplet adhesion in the fluid.

[0027] When a microwave signal transmitted by a microstrip antenna travels through a mixed fluid, the propagation characteristics of the microwave signal are affected to varying degrees by the different structures of the mixed fluid, resulting in a phase shift during transmission. By measuring the phase shift response signal of the microwave signal and then performing cross-correlation calculations on the signals from the upstream and downstream sensors, the correlation velocity of the mixed fluid can be obtained.

[0028] (2) In this embodiment, the distance between the upstream and downstream sensors was first determined to be 300mm. The length of the sensor's grounding plate... l Optimization is required. The grounding plate not only serves as the grounding structure for the microstrip antenna but also functions to shield against external environmental interference signals. Therefore, the choice of its length directly affects the degree of electromagnetic interference between the upstream and downstream sensors.

[0029] From the working principle of microstrip antennas, the grounding plate area should be as large as possible to ensure the transmission of microwave signals on the antenna. However, for this sensor, a larger grounding plate area results in a longer grounding plate length, bringing the upstream and downstream sensors closer together. This could potentially lead to signal interference between the upstream and downstream sensors, affecting their measurement independence. Therefore, in the simulation, a relatively long grounding plate length is initially set, and then gradually shortened. The electromagnetic field distribution of the upstream and downstream sensors is analyzed to determine whether interference exists between them. Figure 3 Simulation results show that when l When the distance is 160 mm, the electromagnetic field distributions of the upstream and downstream sensors are almost identical and do not interfere with each other, meaning that signal independence and anti-interference capability reach their optimal state. Therefore, the optimal length of the grounding electrode was ultimately determined to be 160 mm.

[0030] (3) Regarding the length of the radiating plates L The flow pattern simulation was used to optimize it. A typical characteristic of horizontal oil-water two-phase flow is significant stratification; therefore, stratified flow was selected as the simulation object. This was achieved by changing the height of the water layer. h By changing the water-holding capacity, a stratified flow simulation model is established, such as... Figure 4 As shown in the figure. During the simulation, the length of the radiating electrode was set to vary from 10 mm to 80 mm, with a step size of 2 mm. The water holding capacity was set to vary from 10% to 90%, with a step size of 10%. For different radiating electrode lengths, the response characteristics under varying water holding capacity were analyzed to evaluate the sensor's sensitivity and measurement stability.

[0031] The sensor has nine phase outputs as the water holding capacity changes from 10% to 90%. The difference between adjacent phases This represents the phase shift change corresponding to each 10% increase in water holding capacity; calculate these 8 phase differences. mean Mean with standard deviation std To evaluate the response characteristics of the sensor under different radiating electrode lengths.

[0032] The mean (mean) represents the sensor's average response to changes in water holding capacity. A larger mean indicates higher sensitivity to these changes. The standard deviation (std) reflects the consistency and stability of the response. A smaller standard deviation indicates a more consistent response and better measurement stability for this structure. After optimizing the grounding electrode length, the radiating electrode length was further optimized: the mean and standard deviation of the response for different radiating electrode lengths are shown below. Figure 5 As shown, in LWhen the length of the radiating electrode plate is 10 mm, the sensor exhibits the highest average response to changes in water holding capacity. Although the standard deviation is also the highest, it remains within an acceptable range, indicating good measurement stability. Therefore, the final length of the radiating electrode plate for this sensor was determined to be 10 mm.

[0033] Converted into ratios, the optimal combination of structural parameters for the dual coaxial microstrip antenna sensing system of the present invention for measuring the correlation velocity of horizontal oil-water two-phase flow is as follows: the ratio of the length of the radiating plate to the length of the grounding plate is 1 / 16; and the ratio of the length of the radiating plate to the spacing between the two coaxial microstrip antenna sensors distributed upstream and downstream is 1 / 30.

[0034] (4) In order to further verify the applicability of the sensor in the detection of correlated velocity in mixed fluids, the present invention conducted simulation analysis on the correlated velocity response characteristics of the sensor.

[0035] In the simulation modeling process, the entire test area within the test pipe is first set to water. Then, an oil plug is placed upstream of the test pipe and programmed to move axially along the pipe to simulate the movement of oil droplets or plugs in the fluid. The oil plug's moving speed is set to 1 m / s, and it passes sequentially through upstream and downstream sensors, such as... Figure 6 As shown.

[0036] During the measurement process, upstream and downstream sensors respectively acquire the phase changes of microwave signals caused by fluid motion to evaluate the sensor's sensitivity to fluid motion. This setup achieves the following objectives: verifying whether the sensor can accurately capture the movement information of the oil plug; analyzing the phase signal change characteristics to verify the measurement consistency between the upstream and downstream sensors; and further deriving the fluid velocity by calculating the phase response time difference.

[0037] The phase response signal curves of the upstream and downstream sensors to the oil plug movement are as follows: Figure 7 As shown, the following phenomena can be observed: when the oil plug passes the upstream sensor, its phase signal exhibits significant fluctuations, indicating that the sensor successfully captured the oil plug's passage. After a certain time delay, the phase signal of the downstream sensor shows similar fluctuations to that of the upstream sensor, indicating that the sensor has a stable sensing capability for the oil plug's movement. The response curves of the upstream and downstream sensors are basically consistent, and there are no significant differences in signal amplitude and shape, indicating that the measurement performance and consistency of the upstream and downstream sensors are high.

[0038] Furthermore, the waveform of the phase curve shows that when the oil plug passes through the sensor measurement area, the phase signal changes drastically, exhibiting a clear signal abrupt change phenomenon, indicating that the sensor can sensitively detect the local motion characteristics inside the fluid; the stable amplitude of the phase change signal indicates that the sensor has strong anti-interference ability and the measurement results have high repeatability.

[0039] from Figure 7 The phase response curves show a significant time delay between the peak phase signals of the upstream and downstream sensors. A cross-correlation algorithm is used to calculate the correlation velocity of the oil plug for the upstream and downstream phase signals, allowing... s ( t ), r ( t If ) is a wave signal, then the cross-correlation function of the two wave signals is... The calculation formula is: (1) here, τ It's a time delay. By calculating different time delays... τ By using the cross-correlation function, we can find the point of maximum correlation of the signal and thus estimate the time delay of the signal.

[0040] By calculating the cross-correlation function under different time delays, the location of the maximum value of the cross-correlation function can be obtained. The time delay corresponding to this location is then determined. This reflects the displacement of the target. Specifically, the time delay. This can be determined by finding the peak of the cross-correlation function: (2) This means finding the cross-correlation function The maximum value point, at this point τ This is the signal propagation delay.

[0041] Given the time delay In this case, the relative velocity of the target can be calculated. Based on the speed of signal propagation, the target's velocity... U cc It can be calculated using the following formula: (3) in, d It is the displacement of the target. This represents the signal propagation delay.

[0042] By calculating this time delay The installation spacing between the upstream and downstream sensors is 300 ms. d = 300mm, relevant velocity U ccThe calculated result was 1 m / s, which was completely consistent with the preset oil plug speed, verifying the accuracy of the sensor's speed measurement.

[0043] (5) Experimental verification and results: A dual-coaxial microstrip antenna sensing system was applied to a dynamic experiment of oil-water two-phase flow to investigate its dynamic measurement performance. The dynamic experiment was conducted using a multiphase flow loop device and sensor system at Tianjin University. The water phase in the fluid medium was tap water, and the oil phase was No. 3 industrial white oil (density 801 kg / m³). 3 The viscosity is 2.8 mPa·s. An integer N-division synthesizer MAX2870 with an output frequency ranging from 23.5 MHz to 6000 MHz is used as the signal source for the microwave sensor. A phase detection circuit is used to measure the phase of the dual-coaxial microstrip antenna sensing system, and the phase values ​​are finally recorded by a host computer. This invention's dual-coaxial microstrip antenna sensing system belongs to the category of microwave sensors, and the measurement system is as follows... Figure 10 As shown.

[0044] A total of 130 operating conditions were set up under different flow rates and moisture contents. The total flow rate range was 10 m³ / s. 3 / day-55 m 3 / day, set interval 5 m 3 / day; the moisture content varies in three ranges: 5%-20%, with 5% increments; 20%-80%, with 10% increments; and 80%-95%, with 5% increments. In sensor detection, due to the different dielectric constants of the oil and water phases, the output response voltage of the coaxial microstrip antenna sensor, acting as a microwave sensor, differs depending on the flow conditions when the oil-water two-phase flow enters the test pipeline. Therefore, the amplitude and phase signal fluctuations and output voltage values ​​acquired by the coaxial microstrip antenna sensor show significant differences depending on the flow structure.

[0045] The flow patterns of horizontal oil-water two-phase flow are classified as: ST, ST&MI, DW / O&DO / W, DO / W&W, DO / W and DW / O.

[0046] Experimental results show that the output fluctuation of microwave signals is mainly affected by the fluctuation of the oil-water interface, the distribution of dispersed phase droplets, and the overall spatial distribution of oil and water, and these factors exhibit different characteristics with changes in flow rate.

[0047] For stratified flow (ST) flow patterns, signal fluctuations are primarily influenced by interfacial fluctuations. Due to the relatively stable oil-water interface, the sensor output signal exhibits small variations, resulting in a generally stable signal. In mixed-interface stratified flow (ST&MI) flow patterns, the presence of dispersed phase droplets causes random disturbances during microwave propagation, leading to enhanced signal fluctuations and more pronounced short-period fluctuations. Since the dispersed droplets in mixed-interface stratified flow (ST&MI) flow patterns are fewer and concentrated near the oil-water interface, the dominant factor in signal fluctuations remains the fluctuations at the oil-water interface.

[0048] For the upper oil-in-water and lower water-in-oil flow patterns (DW / O & DO / W), the dispersed phase droplets are not only numerous but also uniformly distributed in the continuous phase. This distribution characteristic leads to uneven distribution of the oil and water phases, which exacerbates the complexity of the microwave signal propagation path and thus expands the range of signal amplitude jumps.

[0049] For the top-water-in-oil and bottom-water laminar flow pattern (DO / W&W), the oil droplets are distributed at the top of the test pipe, which is a non-uniform flow pattern. In contrast, the oil droplets in the water-in-oil (DO / W) flow pattern are distributed throughout the entire test pipe, making it closer to a uniform flow pattern. Therefore, the output signal amplitude of DO / W&W has a larger range of fluctuations, while the output signal amplitude of DO / W is smaller. For the oil-in-water emulsion (DW / O) flow pattern, the oil phase constitutes the majority of the test pipe, while water droplets are distributed throughout the pipe, resulting in an output signal fluctuation similar to that of DO / W.

[0050] Further analysis of the signal correlation between upstream and downstream sensors reveals that microwave signals exhibit strong correlation under different flow patterns. Regardless of the flow pattern, the signals from upstream and downstream sensors maintain a consistent overall trend, indicating that both sensors can reliably capture the dynamic changes in the oil-water structure. Even under relatively stable flow patterns (such as ST, ST&MI, etc.), the correlation between upstream and downstream signals remains good, demonstrating that the microstrip antenna sensor can effectively capture fluctuations at the oil-water interface. In the more complex DO / W and DW / O flow patterns, the correlation between upstream and downstream signals is good. The fluctuation pattern of microwave signals may be affected by local eddies or turbulence, resulting in a certain phase shift. These large signal fluctuations facilitate the calculation of the correlation between upstream and downstream signals. Based on formulas (1) to (3), the corresponding correlation velocity results for each operating point are calculated as follows: Figure 9 As shown in the figure. It can be seen from the graph that when the moisture content... When fixed, the relevant velocity measured by the sensor With mixing speed The increase is due to the increase in flow patterns, and this increasing trend remains unchanged under different flow patterns, that is, it is not affected by the evolution of flow patterns.

Claims

1. A dual-coaxial microstrip antenna sensing system for measuring the correlation velocity of horizontal oil-water two-phase flow, characterized in that, The test tube (4) is made of insulating material, a central insert (9), and two identical coaxial microstrip antenna sensors fixed upstream and downstream of the test tube (4), respectively. The central insert (9) is coaxial with the test tube (4). The coaxial microstrip antenna sensor includes a receiving microstrip antenna attached to the outside of the test tube (4) and a transmitting microstrip antenna installed inside the central insert (9). The receiving microstrip antenna includes a receiving antenna ground plate (2), a receiving antenna radiating plate (3), and a receiving antenna port (1). The receiving antenna ground plate (2) is located outside the receiving antenna radiating plate (3). The transmitting microstrip antenna includes a transmitting antenna radiating plate (6). The transmitting antenna ground plate (7) and transmitting antenna port (8) are located inside the transmitting antenna radiating plate (6). The four plates of the receiving antenna ground plate (2), receiving antenna radiating plate (3), transmitting antenna ground plate (7) and transmitting antenna radiating plate (6) are coaxial. The two ground plates of the coaxial microstrip antenna sensor are of equal length, and the two radiating plates are also of equal length. The ratio of the length of the radiating plate to the length of the ground plate is between 1 / 18 and 1 / 14. The ratio of the length of the radiating plate to the distance between the two coaxial microstrip antenna sensors distributed upstream and downstream is between 1 / 35 and 1 / 25.

2. The dual coaxial microstrip antenna sensing system for measuring the correlation velocity of horizontal oil-water two-phase flow according to claim 1, characterized in that, The ratio of the length of the radiating electrode to the length of the grounding electrode is 1 / 16.

3. The dual coaxial microstrip antenna sensing system for measuring the correlation velocity of horizontal oil-water two-phase flow according to claim 1, characterized in that, The ratio of the length of the radiating plate to the distance between the two coaxial microstrip antenna sensors located upstream and downstream is 1 / 30.

4. The dual-coaxial microstrip antenna sensing system for measuring the correlation velocity of horizontal oil-water two-phase flow according to claim 1, characterized in that, The parameters of the radiating plate length were optimized using flow pattern simulation. Stratified flow was selected as the simulation object, and the water holding capacity was changed by altering the height of the water layer to establish a stratified flow simulation model.

5. The dual coaxial microstrip antenna sensing system for measuring the correlation velocity of horizontal oil-water two-phase flow according to claim 4, characterized in that, During the simulation, the range of variation of the radiating plate length and the range of variation of the water holding rate were set. For different radiating plate lengths, the mean and standard deviation of the response were calculated based on the phase shift caused by the change in water holding rate. The response characteristics under the change in water holding rate were analyzed to evaluate the sensitivity and measurement stability of the coaxial microstrip antenna sensor and determine the optimized parameters of the radiating plate.

6. The dual coaxial microstrip antenna sensing system for measuring the correlation velocity of horizontal oil-water two-phase flow according to claim 5, characterized in that, The electric field distribution and response signal to changes in the medium of the sensor are simulated under different grounding plate lengths and radiating plate lengths. The optimal parameter combination of the coaxial microstrip antenna sensor is determined by field strength and sensitivity analysis.

7. The dual coaxial microstrip antenna sensing system for measuring the correlation velocity of horizontal oil-water two-phase flow according to claim 1, characterized in that, The test pipe is made of acrylic.

8. The dual coaxial microstrip antenna sensing system for measuring the correlation velocity of horizontal oil-water two-phase flow according to claim 1, characterized in that, The central insert is made of resin.

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