Apparatus and method for acoustic analysis of soft matter assembly structure uniformity

Abstract

The application relates to a soft matter assembly structure uniformity acoustic analysis device and a testing method, which comprises a test box, a sample pool for placing a sample, which is arranged in the interior of the test box, and standing wave tubes arranged on opposite sides of the sample pool, an acoustic wave generating device connected with one of the standing wave tubes, a detector connected with the other standing wave tube, and an analysis processing system connected with the detector. The sample is placed on a sample loading disc in the sample pool, the test box is closed before testing to achieve a good sound insulation effect, the acoustic wave generating device is used to emit acoustic waves to pass through the sample, the sound data of sampling points at different parts of the sample are collected for analysis, the uniformity of the sample can be rapidly and accurately evaluated, and the stability of the sample can be accurately evaluated through sampling analysis of the same part for a certain time.

Description

Technical Field

[0001] This invention relates to the field of analytical apparatus and equipment technology, and in particular to an acoustic analysis device and testing method for the structural uniformity of soft matter assemblies. Background Technology

[0002] Soft matter, proposed in 1991 by Nobel laureate in physics PG de Gennes, refers to substances that lie between solids and ideal fluids, including liquid crystals, polymers, colloids, films, foams, and particulate matter, which are widely present in nature, living organisms, daily life, and production.

[0003] Polysaccharides and proteins, widely used in the food industry, are considered soft condensed matter according to soft matter theory. Food components (such as proteins and polysaccharides) can form aggregates with different structures (liquid, semi-solid, and solid) through molecular assembly. These different aggregate structures determine the quality and grade of the food. The assembly structure and uniformity of these soft matter complex systems determine the microstructure and application quality of liquid, semi-solid, and solid foods. Characterizing the assembly structure and uniformity of soft matter components is a prerequisite for controlling food quality and a necessary application technology in the food industry. Therefore, accurate and rapid detection of the structural uniformity of soft matter assemblies is of great significance for the development of high-quality foods.

[0004] In related technologies, the determination of the uniformity of soft matter assembly structure mainly involves infrared spectroscopy imaging, Raman spectroscopy imaging, and low-field nuclear magnetic resonance (NMR) techniques. However, these instruments and equipment for assessing the uniformity of soft matter assembly structure are complex, time-consuming, and inefficient.

[0005] Therefore, it is necessary to propose a new acoustic analysis device and testing method for the structural uniformity of soft matter assemblies to solve the above problems. Summary of the Invention

[0006] This invention provides an acoustic analysis device and testing method for the structural uniformity of soft matter assemblies, in order to solve the problems of complex instruments and equipment, long experimental time, and low efficiency in the related technologies for uniformity assessment.

[0007] In a first aspect, an acoustic analysis device for the structural uniformity of soft matter assemblies is provided, comprising: a test chamber; a sample cell for placing a sample, disposed inside the test chamber, wherein standing wave tubes are provided on opposite sides of the sample cell; a sound wave generator connected to one of the standing wave tubes; a detector connected to the other standing wave tube, wherein the detector is connected to an analysis and processing system.

[0008] In some embodiments, the sample cell is mounted on a lifting mechanism that can drive the sample cell to move along the height direction.

[0009] In some embodiments, the sound wave generator and the detector are mounted on a lifting mechanism that can drive the sound wave generator and the detector to move along the height direction.

[0010] Secondly, a testing method for an acoustic analysis device for the structural uniformity of a soft matter assembly is provided, comprising the following steps: placing a sample into a sample cell and closing the test chamber; turning on a sound wave generator and using a detector to collect sound data from sampling points at different locations of the sample; using an analysis and processing system to analyze the sound absorption coefficient of the sample at different sampling points based on the sound data; and analyzing the uniformity of the sample based on the sound absorption coefficient of the sample at different sampling points.

[0011] In some embodiments, the step of collecting sound data from different sampling points of the sample using a detector includes: using a lifting mechanism to drive the sample cell to different designated positions, and using the detector to collect sound data of the sample at different designated positions.

[0012] In some embodiments, the step of collecting sound data from different sampling points of the sample using a detector includes: using a lifting mechanism to drive the sound wave generator and the detector to different designated positions, and using the detector to collect sound data of the sample at different designated positions.

[0013] In some embodiments, before activating the sound wave generator, the method further includes: acquiring the characteristic absorption frequency of the sample and adjusting the emission frequency of the sound wave generator to the characteristic absorption frequency.

[0014] In some embodiments, the step of using the analysis and processing system to analyze the sound absorption coefficient of the sample at different sampling points based on the sound data includes: recording the emission intensity of the sound wave before it passes through the sample cell and the received intensity after it passes through the sample cell; and calculating the sound absorption coefficient based on the emission intensity and the received intensity.

[0015] In some embodiments, analyzing the uniformity of the sample based on the sound absorption coefficients at different sampling points includes: comparing the sound absorption coefficients of the sample at different sampling points; if the sound absorption coefficients are within a preset range, it indicates that the uniformity of the sample is good.

[0016] In some embodiments, after analyzing the uniformity of the sample based on the sound absorption coefficients at different sampling points, the method further includes: turning on the sound wave generating device and collecting sound data of the same sampling point of the sample changing over time using the detector; analyzing the change of the sound waves absorbed at the same sampling point of the sample over time using an analysis and processing system; and analyzing the stability of the sample based on the change of the sound waves absorbed at the same sampling point of the sample over time.

[0017] The beneficial effects of the technical solution provided by this invention include:

[0018] This invention provides an acoustic analysis device and testing method for the structural uniformity of soft matter assemblies. By placing the sample on a sample tray in a sample cell and closing the test chamber before testing to achieve good sound insulation, a sound wave generator is used to emit sound waves that pass through the sample. By collecting and analyzing sound data from sampling points at different parts of the sample, the uniformity of the sample can be evaluated quickly and accurately. The equipment is simple and highly efficient. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic diagram of the overall structure of an acoustic analysis device for the uniformity of soft matter assembly structure provided in an embodiment of the present invention;

[0021] Figure 2 A schematic diagram of the sample cell of the acoustic analysis device for the uniformity of soft matter assembly structure provided in an embodiment of the present invention;

[0022] Figure 3 The height-sound absorption coefficient diagram of the KGM / S composite provided in Example 1 of this invention;

[0023] Figure 4 The height-sound absorption coefficient diagram of the K0.4G4 composite provided in Example 2 of the present invention;

[0024] Figure 5 The height-sound absorption coefficient diagram of the K0.4G2 composite provided in Example 2 of the present invention.

[0025] Numbering on the map:

[0026] 1. Test chamber; 2. Sample cell; 3. Standing wave tube; 4. Acoustic wave generator; 5. Detector; 6. Analysis and processing system; 7. Lifting mechanism. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] This invention provides an acoustic analysis device and testing method for the structural uniformity of soft matter assemblies, which can solve the problems of complex evaluation instruments and equipment, long experimental time, and low efficiency in related technologies.

[0029] See Figure 1 As shown, an acoustic analysis device for the structural uniformity of a soft matter assembly is provided in an embodiment of the present invention. It may include a test chamber 1, a sample cell 2, a standing wave tube 3, a sound wave generator 4, a detector 5, and an analysis and processing system 6.

[0030] The test chamber 1 includes an outer shell made of acrylic and an inner wall covered with sound-insulating material, which can effectively block external environmental noise interference.

[0031] The sample cell 2 is used to place the sample and is located inside the test chamber 1. The sample cell 2 is made of quartz glass or similar materials. A sample tray is set inside the sample cell 2. The sample tray can hold a sample with a thickness between 1 cm and 5 cm. A temperature controller can be set at the bottom of the sample cell 2 to maintain the temperature of the sample. Standing wave tubes 3 are set on both sides of the sample cell 2.

[0032] The sound wave generator 4 is connected to the standing wave tube 3 on one side. The sound wave generator 4 includes a sound source and a filter. The sound source can emit audio frequencies of 20-10000Hz that penetrate the sample cell 2. The filter and the standing wave tube 3 are located at the front end of the sample cell 2, which is beneficial for screening and focusing the audio.

[0033] Detector 5 is connected to the standing wave tube 3 on the other side. Detector 5 is also connected to the analysis and processing system 6. The standing wave tube 3 and detector 5 are located behind the sample cell to improve test stability. Detector 5 is used to measure the sound intensity after the assemblies formed by different soft matter components absorb sound waves. The probe wire of detector 5 passes through the hole on the right side of the test chamber 1 and is connected to the external analysis and processing system 6. By utilizing the different absorption degrees of different soft matter assembly gels for different frequencies of sound, the uniformity of their structure is characterized. This method is fast, effective, and uses simple equipment.

[0034] See Figure 1 and Figure 2 As shown, in some optional embodiments, the sample cell 2 is mounted on the lifting mechanism 7, which can drive the sample cell 2 to move along the height direction. In this embodiment, the lifting mechanism 7 has a precision vertical guide rail lifting system, uses a silent motor as a power source, and is controlled by a control box. The operating noise of the silent motor is less than 40 decibels. The sample needs to have at least 5 sampling points. By using the lifting mechanism 7 to drive the sample cell 2 to move, sampling can be performed at each of the 5 sampling points, which is convenient and fast. By comparing the consistency of the sound absorption coefficients of more than 5 sampling points, the uniformity of the condensed-state structure of the assembly can be analyzed. The sampling points are evenly distributed, the test results are more accurate, and the sampling process is simple, convenient, and fast. In other embodiments, the sound wave generator 4 and the detector 5 can also be mounted on the lifting mechanism 7. The lifting mechanism 7 can drive the sound wave generator 4 and the detector 5 to move along the height direction. By using the lifting mechanism 7 to drive the sound wave generator 4 and the detector 5 to move, sampling can be performed at each of the 5 sampling points, which can avoid the influence of the movement of the sample cell 2 on the structure of the sample.

[0035] Furthermore, the lifting mechanism 7 also has a sensor for detecting the rotational speed of the silent motor and controlling the stable and uniform lifting of the sample cell 2 or the sound wave generator 4 and detector 5.

[0036] See Figure 1 and Figure 2 As shown, this invention provides a testing method for an acoustic analysis device for the structural uniformity of a soft matter assembly, which may include the following steps:

[0037] Step S01: Place the sample into the sample pool 2 and close the test chamber 1.

[0038] Step S02: Turn on the sound wave generator 4 and use the detector 5 to collect sound data from different sampling points of the sample.

[0039] Step S03: The analysis and processing system 6 is used to analyze the sound absorption coefficient of the sample at different sampling points based on the sound data.

[0040] Step S04: Analyze the uniformity of the sample based on the sound absorption coefficients at different sampling points.

[0041] In this embodiment, the absorption and filtering of sound at different sampling points of the experimental sample is tested in a test chamber 1 with good sound insulation. The high-precision analysis and processing system 6 is used to evaluate and analyze the sound intensity and frequency after filtering at different sampling points, thereby characterizing the uniformity of the soft matter assembly structure. This method is fast and effective.

[0042] See Figure 1 and Figure 2As shown, in some optional embodiments, the step of collecting sound data from different sampling points of the sample using detector 5 may include: using lifting mechanism 7 to drive sample cell 2 to different designated positions, and using detector 5 to collect sound data of the sample at different designated positions. In other embodiments, lifting mechanism 7 may also be used to drive sound wave generator 4 and detector 5 to different designated positions, and detector 5 may be used to collect sound data of the sample at different designated positions. By driving sample cell 2 to move or driving sound wave generator 4 and detector 5 to move synchronously through lifting mechanism 7, more than 5 sampling points can be measured in one experiment, which is convenient and fast.

[0043] See Figure 1 As shown, further, before activating the sound wave generating device 4, the process may include: acquiring the characteristic absorption frequency of the sample, and adjusting the emission frequency of the sound wave generating device 4 to the characteristic absorption frequency. In this embodiment, since a medium absorbs energy at different frequencies corresponding to a specific frequency of a sound source in different ways, the absorption curve derived from this absorption data is called the sound absorption frequency characteristic curve. The medium has a maximum absorption peak at the characteristic frequency, which is called the characteristic absorption frequency. During testing, for different types of pure substances or mixtures of samples, a specific sound wave is passed through the sample, and the attenuation degree and frequency change of the sound wave are measured. By comparing the absorption coefficients of the same sample at different collection points at the characteristic absorption frequency, the uniformity of the sample is determined, making the test results more intuitive and accurate.

[0044] See Figure 1 As shown, further, the analysis and processing system 6 analyzes the sound absorption coefficient of the sample at different sampling points based on the sound data, including: recording the emission intensity of the sound wave before passing through the sample cell 2 and the received intensity after passing through the sample cell 2; calculating the sound absorption coefficient based on the emission intensity and the received intensity. In this embodiment, the sound absorption coefficient is calculated as: sound absorption coefficient = (emission intensity - absorption intensity) / emission intensity. The sound absorption coefficient is calculated by the emission intensity of the sound wave generator 4 and the received intensity measured by the detector 5, which is simple, intuitive, convenient and fast.

[0045] See Figure 1As shown, further, the analysis of the uniformity of the sample based on the sound absorption coefficient at different sampling points can include: comparing the sound absorption coefficient of the sample at different sampling points. If the sound absorption coefficient is within a preset range, it indicates that the uniformity of the sample is good. In this embodiment, the soft matter component composite solution can be used to prepare materials with complex porous structures. These materials usually have a strong sound absorption capacity. The uniformity of the soft matter assembly structure is reflected by collecting the sound attenuation, sound intensity, sound frequency and other sound changes after the sound wave passes through the sample. If the assembly structure between the soft matter components is uniform, it will be shown that the changes produced by the sound wave passing through different parts of the composite sample are the same, and the sound attenuation, sound intensity, sound frequency and other changes are the same or similar. This indicates that the composite sample has the same properties in each part and forms a uniform system. The testing equipment is simple and the process is fast.

[0046] After analyzing the uniformity of the sample based on the sound absorption coefficients at different sampling points, the method may further include: activating the sound wave generator 4 and collecting sound data of the same sampling point of the sample over time using the detector 5; analyzing the changes in the absorbed sound waves at the same sampling point of the sample over time using the analysis and processing system 6; and analyzing the stability of the sample based on the changes in the absorbed sound waves at the same sampling point of the sample over time. In this embodiment, the stability of the condensed-state structure of the assembly is analyzed by collecting the changes in the absorbed sound waves at the same location of the sample over time. By utilizing the different absorption degrees of different soft material assembly gels for different frequencies of sound, the stability of their structure can be characterized with good accuracy and high efficiency.

[0047] Specifically, the method for testing the structural uniformity and stability of soft matter assemblies may include the following steps:

[0048] Biomass materials such as sols, gels, and membranes are placed into a test container of a specific size, such as a quartz glass dish or other container, and placed in the sample cell 2. The sample thickness should not exceed 5 cm. Then, the test chamber 1 is closed.

[0049] The lifting mechanism 7 controls the sound wave generator 4 and detector 5 to move up and down at the same frequency or the sample cell 2 to collect data. When the sensor in the lifting mechanism 7 reaches the designated detection point, the power transmission component stops moving, the sound wave generator 4 is turned on, suitable sound wave parameters for testing are input, and the analysis and processing system 6 is turned on to collect volume data in real time. The recording resolution is 20-10000Hz and the volume accuracy is 0.1dB. When the lifting mechanism 7 is working, the sound data acquisition system is turned off.

[0050] Five sampling points at different locations were tested. The test started 0.5 cm from the top of the sample cell 2, with 0.5 cm intervals. Five data points were collected to measure the changes in the absorption of sound waves at different locations. At the same time, the analysis and processing system 6 recorded the data at a frequency of 0.1 s.

[0051] The analysis and processing system 6 automatically analyzes and plots the above 5 data points, and analyzes the uniformity of the condensed-state structure of the assembly through the consistency analysis of the 5 data points.

[0052] When testing the structural stability of soft matter assemblies, the same sampling point is tested, and the test interval can be set, such as 5s (1h). The time-absorption coefficient curve is plotted, and the changes in the absorption of sound waves at the same location are compared with the changes in the sample over time. Through the analysis and processing system 6, the software automatically analyzes the above time-absorption coefficient curve and determines the stability of the condensed state structure of the assembly by the rise and fall of data points in different time periods.

[0053] The principle of the acoustic analysis device and testing method for the structural uniformity of soft matter assemblies provided in this invention is as follows:

[0054] By employing the standing wave tube method to collect changes in acoustic parameters such as sound attenuation, sound intensity, and sound frequency after sound waves pass through different parts of a sample, and comparing the consistency of the sound absorption coefficients at multiple data points and the time-varying pattern of the sound absorption coefficients at the same location, the uniformity and stability of the condensed-state structure of the assembly can be analyzed. This enables in-situ, non-destructive, and dynamic monitoring of the sample, and deconstructs the interactions of soft matter components from a novel perspective and with a simple and rapid method. This will provide new means and tools for scientific research on soft matter, enrich the research methods for soft matter components, and also provide a method for detecting the uniformity and stability of samples in different states that can be mutually verified and referenced.

[0055] The present invention will now be described in further detail with reference to Embodiments 1 and 2.

[0056] Example 1 describes the preparation of a konjac glucomannan-soluble starch solution:

[0057] A series of konjac glucomannan (KGM) / soluble starch (S) blend solutions with different mixing ratios were prepared using a solution casting method, and their formulations are shown in Table 1. First, KGM powder was dissolved in distilled water and continuously stirred at 600 rpm for 1 hour using an electric stirrer to prepare the KGM solution. Similarly, the S solution was prepared by dissolving S in distilled water and continuously stirring at 400 rpm for 0.5 hours at 95°C. The KGM / S blend solution was prepared by slowly adding the S solution to the KGM solution and stirring at 1000 rpm for 0.5 hours at 60°C. The blend solutions were then poured onto glass plates measuring 28 cm × 28 cm × 1.5 cm and dried in an oven at 60°C for 12 hours to form a film. The total KGM and S content in all samples was maintained at 1.0 g dry basis. Before the experiment, all blend films were treated at 25 ± 1°C and 40 ± 2% relative humidity (RH) for 48 hours. Film thickness (mm) was measured using a micrometer.

[0058] Table 1 Formulations of KGM / S composite solutions / composite membranes with different ratios

[0059]

[0060] Three different proportions of the KGM / S composite solution were selected and placed in a quartz glass dish using a quantitative sampler. The dish was then placed in the sample cell 2, and the test chamber 1 was closed to achieve good sound insulation. The lifting mechanism 7 was activated to control the acoustic wave generator 4 and the detector 5 to move up and down at the same frequency to collect data. The sampling point was set to 0.5 cm from the top of the sample cell. The acoustic wave generator 4 was activated, and the acoustic wave parameters for the test were input. By collecting five data points from the sample, the uniformity of the KGM / S composite was analyzed and determined.

[0061] Example 2 describes the preparation of konjac glucomannan-gelatin solutions: A series of konjac glucomannan KGM / gelatin G blend solutions with different mixing ratios were prepared using a solution casting method, and their formulations are shown in Table 2. First, KGM powder was dissolved in distilled water and continuously stirred at 600 rpm for 1 hour using an electric stirrer to prepare a KGM solution. Similarly, the G solution was prepared by dissolving G in distilled water and continuously stirring at 400 rpm for 0.5 hours at 90°C. The KGM / G blend solution was prepared by slowly adding the G solution to the KGM solution and stirring at 1000 rpm for 1 hour at 90°C. The blend solution was then poured onto a 28cm × 28cm × 1.5cm glass plate and dried in an oven at 60°C for 12 hours to form a film. The total content of KGM and G in all samples was maintained at 1.0g dry basis. Before the experiment, all blend films were treated at 25±1°C and 40±2% relative humidity (RH) for 48 hours. The film thickness (in mm) is measured using a micrometer.

[0062] Table 2 Formulations of KGM / G composite solutions / composite membranes with different ratios

[0063]

[0064] Two ratios of the KGM / G complex solution were selected and placed in a quartz glass dish using a quantitative sampler. The dish was then placed in the sample cell 2, and the test chamber 1 was closed to achieve good sound insulation. The lifting mechanism 7 was activated to control the acoustic wave generator 4 and the detector 5 to move up and down at the same frequency to collect data. The sampling point was set to 0.5 cm from the top of the sample cell. The acoustic wave generator 4 was activated, and the acoustic wave parameters for the test were input. By collecting five data points from the sample, the uniformity of the KGM / G complex was analyzed and determined.

[0065] See Figure 3 , Figure 4 and Figure 5As shown, the results indicate that the KGM / S composite assembly has good structural uniformity, and the standard deviation of the sound absorption coefficient at the five test points divided by the arithmetic mean is less than 0.05, indicating that the composite assembly has good uniformity. The K0.4G4 composite assembly system underwent phase separation after standing for 1 day. The standard deviation of the sound absorption coefficient at the five test points of K0.4G2 divided by the arithmetic mean is much greater than 0.05, indicating that sedimentation separation occurred and the uniformity is poor.

[0066] In the description of this invention, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0067] It should be noted that in this invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0068] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A test method for an acoustic analysis device for the structural uniformity of a soft matter assembly, characterized in that: The device includes: Test chamber (1); The sample cell (2) for placing the sample is located inside the test chamber (1), and standing wave tubes (3) are provided on both sides of the sample cell (2). A sound wave generating device (4) is connected to the standing wave tube (3) on one side; The detector (5) is connected to the standing wave tube (3) on the other side, and the detector (5) is connected to the analysis and processing system (6); The sound wave generator (4) and the detector (5) are mounted on the lifting mechanism (7), which can drive the sound wave generator (4) and the detector (5) to move along the height direction; The testing method includes the following steps: Place the sample into the sample cell (2) and close the test chamber (1); Turn on the sound wave generator (4) and use the detector (5) to collect sound data from different sampling points of the sample; The analysis and processing system (6) analyzes the sound absorption coefficient of the sample at different sampling points based on the sound data; The uniformity of the sample was analyzed based on the sound absorption coefficients at different sampling points. The sound data collected from different sampling points of the sample using the detector (5) includes: The sample cell (2) is moved to different designated positions by using the lifting mechanism (7), and the sound data of the sample at different designated positions is collected by the detector (5).

2. The test method as described in claim 1, characterized in that: The sample cell (2) is installed on the lifting mechanism (7), which can drive the sample cell (2) to move along the height direction.

3. The test method as described in claim 1, characterized in that, The sound data collected from different sampling points of the sample using the detector (5) includes: The sample cell (2) is moved to different designated positions by using the lifting mechanism (7), and the sound data of the sample at different designated positions is collected by the detector (5).

4. The test method as described in claim 1, characterized in that, The sound data collected from different sampling points of the sample using the detector (5) includes: The sound wave generator (4) and the detector (5) are driven to move to different designated positions using the lifting mechanism (7), and the sound data of the sample at different designated positions are collected using the detector (5).

5. The test method as described in claim 1, characterized in that, Before activating the sound wave generator (4), the following is also included: Obtain the characteristic absorption frequency of the sample and adjust the emission frequency of the sound wave generator (4) to the characteristic absorption frequency.

6. The test method as described in claim 1, characterized in that, The analysis and processing system (6) analyzes the sound absorption coefficient of the sample at different sampling points based on the sound data, including: Record the emission intensity of the sound wave before it passes through the sample cell (2) and the received intensity after it passes through the sample cell (2); The sound absorption coefficient is calculated based on the emission intensity and the reception intensity.

7. The test method as described in claim 1, characterized in that, The analysis of the uniformity of the sample based on the sound absorption coefficient at different sampling points includes: By comparing the sound absorption coefficients of the sample at different sampling points, if the sound absorption coefficients are within a preset range, it indicates that the sample has good uniformity.

8. The test method as described in claim 1, characterized in that, After analyzing the uniformity of the sample based on the sound absorption coefficients at different sampling points, the method further includes: Turn on the sound wave generator (4) and collect the sound data of the same sampling point of the sample changing over time through the detector (5); The analysis and processing system (6) is used to analyze the change of the sound waves absorbed by the same sampling point of the sample over time; The stability of the sample is analyzed based on the change in the sound waves absorbed at the same sampling point over time.

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