CN-121978133-A - Method and system for measuring bubble air content in micro-nano bubble solution

CN121978133ACN 121978133 ACN121978133 ACN 121978133ACN-121978133-A

Abstract

The invention provides a method and a system for measuring the bubble air content in a micro-nano bubble solution, which relate to the technical field of fluid measurement, and the method comprises the steps of collecting time domain reflection waveform signals and the solution temperature of the micro-nano bubble solution; the method comprises the steps of extracting characteristic parameters of a micro-nano bubble solution based on a time domain reflection waveform signal, constructing a bubble air content measuring model, calibrating system parameters of the bubble air content measuring model to obtain a bubble air content measuring model calibrated by the system parameters, inputting the characteristic parameters and the solution temperature into the bubble air content measuring model calibrated by the system parameters, and outputting a bubble air content measuring result for on-line monitoring. The invention can effectively improve the measurement precision and stability of the bubble air content in the micro-nano bubble solution and realize the on-line monitoring of the bubble air content.

Inventors

GUO YUAN
WU JINGWEI
JIANG DASHUANG
LI BINGCHENG

Assignees

中山大学

Dates

Publication Date: 20260505
Application Date: 20260403

Claims (10)

1. The method for measuring the bubble air content in the micro-nano bubble solution is characterized by comprising the following steps of: s1, acquiring a time domain reflection waveform signal and the solution temperature of a micro-nano bubble solution; s2, extracting characteristic parameters of the micro-nano bubble solution based on the time domain reflection waveform signals; S3, constructing a bubble air content measuring model, and calibrating system parameters of the bubble air content measuring model to obtain a bubble air content measuring model with calibrated system parameters; s4, inputting the characteristic parameters and the solution temperature into a bubble air content measuring model calibrated by the system parameters, and outputting a bubble air content measuring result for on-line monitoring.
2. The method for measuring the bubble air content of the micro-nano bubble solution according to claim 1, wherein the extracting the characteristic parameters of the micro-nano bubble solution based on the time domain reflection waveform signal comprises: S21, determining an incident step forward inflection point and a first far-end reflection echo starting trip point of the time domain reflection waveform signal; S22, reading an abscissa t 1 of the incident step forward inflection point and an abscissa t 2 of the far-end reflection echo starting trip point, and calculating the propagation time delta t=t 2 -t 1 of electromagnetic waves in a probe sensitive section according to an abscissa t 1 of the incident step forward inflection point and an abscissa t 2 of the far-end reflection echo starting trip point; s23, calculating the equivalent dielectric constant of the micro-nano bubble solution based on the propagation time delta t The equivalent dielectric constant is calculated As the characteristic parameter.
3. The method for measuring the air bubble void fraction in a micro-nano bubble solution according to claim 2, wherein the equivalent dielectric constant of the micro-nano bubble solution is calculated based on the propagation time Δt The following are provided: Wherein, the The speed of light is indicated as being the speed of light, Representing the length of the sensitive segment of the probe.
4. The method for measuring the air bubble content in the micro-nano bubble solution according to claim 2, wherein the expression for constructing the air bubble content measuring model is as follows: Wherein, the The calculated air content of micro-nano bubbles is represented, Expressed in standard reference temperature The dielectric constant of the lower pure water, T, represents the solution temperature measured in real time, A first calibration coefficient is indicated and is used, A second calibration coefficient is indicated and is used to represent, Representing a third calibration factor.
5. The method for measuring the air content of bubbles in the micro-nano bubble solution according to claim 4, wherein the system parameters comprise a first calibration coefficient, a second calibration coefficient and a third calibration coefficient, and the calibrating the system parameters of the air content measuring model comprises: S31, determining that the first calibration coefficients are all used for Second calibration coefficient And a third calibration coefficient The first calibration condition, the second calibration condition and the third calibration condition are calibrated; S32, respectively inputting the first calibration condition, the second calibration condition and the third calibration condition into the bubble air-content measuring model to respectively obtain a corresponding first bubble air-content measuring model, a corresponding second bubble air-content measuring model and a corresponding third bubble air-content measuring model; S33, simplifying the first bubble gas content measuring model and the second bubble gas content measuring model, and combining the first bubble gas content measuring model and the third bubble gas content measuring model to obtain a ternary equation set; S34, performing first calibration coefficient on the ternary equation set Second calibration coefficient And a third calibration coefficient Solving to obtain a calibrated first calibration coefficient Second calibration coefficient And a third calibration coefficient 。
6. The method for measuring the bubble void fraction in a micro-nano bubble solution according to claim 5, wherein the first calibration condition is the void fraction in the micro-nano bubbles Solution temperature measured in real time in solution=0 The calculated equivalent dielectric constant The second calibration condition is the air content of micro-nano bubbles = Measured in real time in solution The calculated equivalent dielectric constant The third calibration condition is the air content of micro-nano bubbles = Measured in real time in solution The calculated equivalent dielectric constant 。
7. The method for measuring the bubble gas content of the micro-nano bubble solution according to claim 6, wherein the expression of the first bubble gas content measurement model is as follows: the expression of the second bubble air content measurement model is as follows: the expression of the third bubble air content measurement model is as follows: 。
8. the method for measuring the air-bubble content of a micro-nano bubble solution according to claim 7, wherein the first air-bubble air-content measuring model, the second air-bubble air-content measuring model and the third air-bubble air-content measuring model are simplified and combined to obtain a ternary equation set as follows: 。
9. The method for measuring the bubble gas content of the micro-nano bubble solution according to any one of claims 1 to 8, wherein the outputting the bubble gas content measurement result for on-line monitoring comprises: and constructing a dynamic curve of the air bubble air content measurement result changing along with time, wherein the abscissa of the dynamic curve is the running time of the air bubble generator, the ordinate is the air bubble air content measurement result, and the dynamic curve is utilized to monitor the air bubble air content measurement result on line.
10. The utility model provides a bubble air content rate measurement system in micro-nano bubble solution which characterized in that includes: The bubble generation module is used for generating bubbles in the test solution to form a micro-nano bubble solution; the temperature acquisition module is used for acquiring the solution temperature of the micro-nano bubble solution; The measuring module is used for collecting the time domain reflection waveform signals; The signal processing module is used for extracting characteristic parameters of the micro-nano bubble solution according to the time domain reflection waveform signals, constructing a bubble air content measuring model, calibrating system parameters of the bubble air content measuring model to obtain a bubble air content measuring model with calibrated system parameters, inputting the characteristic parameters and the solution temperature into the bubble air content measuring model, and outputting a bubble air content measuring result by the bubble air content measuring model.

Description

Method and system for measuring bubble air content in micro-nano bubble solution Technical Field The invention relates to the technical field of fluid measurement, in particular to a method and a system for measuring the bubble air content in a micro-nano bubble solution. Background The micro-nano bubble technology is widely applied to the fields of environmental protection water treatment, aquaculture oxygenation, fine chemical reaction enhancement, semiconductor precise cleaning and the like by virtue of high-efficiency gas-liquid mass transfer efficiency and unique physicochemical characteristics. The bubble gas content, namely the gas volume fraction, is used as a core performance index of the micro-nano bubble solution, the application effect of the micro-nano bubble solution is directly determined, the measurement of the bubble gas content is realized, and the method has important significance for the optimization of related processes, the control of processes and the scientific research. The current micro-nano bubble solution gas content measuring method mainly comprises an off-line sampling analysis method, an optical imaging method and an acoustic attenuation method, wherein the off-line sampling analysis method is used for sampling and detecting a solution, such as a volume method and a pressure dissolution method, can destroy continuity of a flow field, cannot realize real-time on-line monitoring, is easy to generate gas dissipation in the measuring process, introduces larger measuring errors, the optical imaging method is used for collecting bubble images by means of high-speed camera equipment, counting the number and size distribution of bubbles through image processing, the method is high in equipment cost, has strict requirements on transparency of a measured water body and on-site illumination conditions, is difficult to adapt to actual working conditions of an industrial site when high-concentration bubble groups are overlapped, and the acoustic attenuation method is used for inverting the gas content according to attenuation rules after ultrasonic waves pass through the bubble water body, is easy to be subjected to multiple interference of bubble size distribution and environmental noise, and has complex inversion model and complicated on-site calibration flow, and limited practicality. However, the Time Domain Reflectometry (TDR) technology has the advantages of non-invasive detection, high response speed, small disturbance to a detected medium and the like, is well-developed in the fields of soil moisture content, solution concentration detection and the like, is a gas-liquid two-phase mixed medium, has obvious correlation between equivalent dielectric constants and bubble gas content, and can realize gas content measurement through the TDR technology. Disclosure of Invention In order to solve the problems that in the prior art, the measurement accuracy of the air bubble content in the micro-nano bubble solution is low, the stability is poor, and the online monitoring of the air bubble content is difficult to realize, the invention provides a method and a system for measuring the air bubble content in the micro-nano bubble solution, which can effectively improve the measurement accuracy and the stability of the air bubble content in the micro-nano bubble solution, and realize the online monitoring of the air bubble content. In order to achieve the technical effects, the technical scheme of the invention is as follows: a method for measuring the air content of bubbles in a micro-nano bubble solution comprises the following steps: s1, acquiring a time domain reflection waveform signal and the solution temperature of a micro-nano bubble solution; s2, extracting characteristic parameters of the micro-nano bubble solution based on the time domain reflection waveform signals; S3, constructing a bubble air content measuring model, and calibrating system parameters of the bubble air content measuring model to obtain a bubble air content measuring model with calibrated system parameters; s4, inputting the characteristic parameters and the solution temperature into a bubble air content measuring model calibrated by the system parameters, and outputting a bubble air content measuring result for on-line monitoring. Preferably, the extracting the characteristic parameters of the micro-nano bubble solution based on the time domain reflection waveform signal includes: S21, determining an incident step forward inflection point and a first far-end reflection echo starting trip point of the time domain reflection waveform signal; S22, reading an abscissa t 1 of the incident step forward inflection point and an abscissa t 2 of the far-end reflection echo starting trip point, and calculating the propagation time delta t=t 2-t1 of electromagnetic waves in a probe sensitive section according to an abscissa t 1 of the incident step forward inflection point and an abscissa t 2 of the far-end reflection echo st