A Smart Testing System and Method for Resistance Testing of Porous Glass Plate Absorber Tubes

Abstract

This invention discloses an intelligent resistance testing system and method for porous glass plate absorption tubes, belonging to the field of testing technology. The system includes a gas source unit, an electronic soap film flow meter unit, a test interface unit, a digital micro differential pressure gauge unit, and a main control unit. The electronic soap film flow meter unit integrates a soap film tube, a photoelectric sensor, a flow regulating valve, and a control module, forming a closed-loop flow control circuit with the main control unit to automatically stabilize the flow rate at a standard value. The digital micro differential pressure gauge unit measures the pressure difference across the absorption tube. The main control unit performs data acquisition, multi-point averaging, and pass / fail determination, and automatically records and stores the test results. This invention integrates the electronic soap film flow meter, the digital micro differential pressure gauge, and the main control unit into a unified resistance testing system, achieving coordinated functions of automatic closed-loop flow control, multi-point pressure averaging, and automatic pass / fail determination.

Description

Technical Field

[0001] This invention relates to the field of testing technology, and in particular to an intelligent testing system for rapidly and accurately measuring the gas path resistance of a porous glass plate absorption tube, and a resistance testing method based on this system. Background Technology

[0002] Porous glass plate absorption tubes are key instruments used in air and exhaust gas monitoring for collecting gaseous pollutants. The porous glass plate inside disperses the gas into tiny bubbles, increasing the contact area with the absorbent liquid and thus improving sampling efficiency. The performance of this instrument directly affects the accuracy of the sampling results. The resistance of the porous glass plate absorption tube at a specific flow rate (usually 0.5 L / min) must be within a specified range (e.g., 4.0 kPa to 6.0 kPa) to ensure the accuracy of the sampling flow rate and the validity of the data. Therefore, resistance testing of newly purchased absorption tubes or those used for a certain period of time is an important part of the quality control in environmental monitoring laboratories.

[0003] In the field of absorption tube resistance testing, utility model patent publication number CN201653616U, entitled "Absorption Bottle Resistance Measuring Instrument," discloses a dedicated testing instrument. The patent states that "currently, there is no complete instrument on the market specifically for testing the resistance of absorption bottles; therefore, designing an instrument capable of testing the resistance of absorption bottles is urgently needed." This measuring instrument mainly includes a housing, a negative pressure gauge, a water filter well, a flow meter, and a vacuum pump. By sequentially connecting the absorption bottle, water filter well, flow meter, and vacuum pump, and connecting the negative pressure gauge to the pipeline between the water filter well and the absorption bottle, dedicated testing of the absorption bottle resistance is achieved. The emergence of this measuring instrument fills the market gap of "no dedicated instrument" in the field of absorption bottle resistance testing and is of pioneering significance.

[0004] However, after years of technological development and practical application, those skilled in the art have found that while the aforementioned absorption bottle resistance measuring instrument has solved the basic problem of "whether or not there is a dedicated instrument," it has significant shortcomings in terms of measurement accuracy, intelligence level, and ease of operation, making it difficult to meet the increasingly stringent quality control requirements of modern environmental monitoring laboratories. Specific deficiencies are as follows: This measuring instrument uses a common flow meter, relying on the operator to manually read the float position to obtain the flow reading. This measurement method has significant visual errors, and the reading results of different operators may differ. The measurement accuracy of the rotor flow meter is greatly affected by environmental factors such as the density, temperature, and pressure of the gas being measured. When the gas contains water vapor or volatile chemicals, the actual position of the float will drift, resulting in a distorted flow reading. This measuring instrument requires the operator to manually adjust the valve to change the flow rate. The adjustment process relies on experience and it is difficult to accurately and quickly reach the standard requirement of 0.5 L / min flow rate. The pressure measuring instrument uses a negative pressure gauge for pressure measurement, which is usually a pointer-type instrument with a large scale interval and limited reading accuracy (generally only 0.1 kPa or less). The acceptable resistance range of the porous glass plate absorption tube is usually only 2 kPa (e.g., 4.0 to 6.0 kPa). The reading error of the pointer-type negative pressure gauge may reach 0.2 to 0.3 kPa, with a relative error as high as 10% to 15%, which seriously affects the accuracy of the acceptance judgment. The pointer-type instrument cannot realize automatic data recording and real-time monitoring. Operators need to manually record the readings, which increases the workload and the probability of error. This instrument can only perform simple resistance measurements and lacks automatic closed-loop flow control. Operators still need to manually adjust the flow rate repeatedly until it stabilizes at around 0.5 L / min. The adjustment process is time-consuming and difficult to achieve precise stability. The instrument also lacks automatic pass / fail determination, requiring operators to memorize standard values ​​and manually compare them. Furthermore, it lacks automatic data storage and traceability, and test results rely on manual recording, which fails to meet the data integrity and traceability requirements of laboratory quality management systems (such as CMA and CNAS). The instrument is equipped with a water filter well and a dryer to prevent water vapor from entering the flow meter and vacuum pump. However, the dryer needs to be replaced and maintained regularly, which increases the cost of use and the complexity of operation. When the dryer fails, the measurement accuracy will drop significantly, and operators often cannot detect it in time.

[0005] In summary, while existing absorption bottle resistance measuring instruments have made breakthroughs in terms of specialization, they are essentially simple integrations of traditional manual reading instruments (rotameters, pointer-type negative pressure gauges) and have not truly achieved automation and intelligence in the measurement process. With the increasing demands for data quality in the environmental monitoring field, developing a high-precision, automated, and intelligent absorption tube resistance testing system and method has become an urgent technical problem to be solved in this field. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide an intelligent testing system and method for the resistance of porous glass plate absorbers that can achieve high-precision measurement, automated control and standardized testing.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A smart testing system for the resistance of porous glass plate absorption tubes includes: The gas source unit provides the gas power required for the test. This gas source unit can be a vacuum pump (drawing gas at negative pressure) or an air compressor (supplying gas at positive pressure), with a vacuum pump being preferred because the absorption tube is usually under negative pressure during sampling, and using a vacuum pump is closer to the actual working conditions.

[0008] The electronic soap film flow meter unit has its inlet connected to the outlet of the air source unit via a pipeline. This unit includes a soap film tube, a photoelectric sensor, a flow regulating valve, and a control module. The soap film tube is a vertically mounted glass or transparent plastic tube with a known fixed volume (e.g., 10 mL, 20 mL, or 50 mL). Photoelectric sensors, including an upper and lower sensor, are mounted on the outside of the soap film tube, located at the upper and lower detection points respectively, for accurately detecting the time point of soap film passage. The control module is electrically connected to both the photoelectric sensor and the flow regulating valve. Its functions include: receiving the soap film passage signal detected by the photoelectric sensor; calculating the time interval between the soap film passing through the upper and lower detection points; calculating the real-time flow rate value using the formula Q = V / t based on the known volume of the soap film tube; comparing the calculated real-time flow rate value with a preset target flow rate value (0.5 L / min); and automatically adjusting the opening of the flow regulating valve based on the comparison result to make the real-time flow rate value approach the target flow rate value. Through the above structure, the electronic soap film flow meter unit realizes the integrated function of flow measurement and flow control, forming the basis for closed-loop flow control.

[0009] The test interface unit has an air inlet port and an air outlet port. The air inlet port is connected to the air outlet of the electronic soap film flow meter unit via a pipeline; the air outlet port is used to connect to the air outlet end of the porous glass plate absorption tube under test via a pipeline. The test interface unit does not involve any special quick-connect structure; a sealed connection with the absorption tube under test can be achieved through ordinary rubber tubing. The structure is simple and the cost is low.

[0010] The digital micro differential pressure gauge unit has a first pressure measuring port and a second pressure measuring port. The first pressure measuring port is connected to the air inlet port of the test interface unit via a pipeline, and the second pressure measuring port is connected to the air outlet port of the test interface unit via a pipeline. It is used to measure the pressure difference (i.e., resistance value) across the porous glass plate absorption tube under test. The preferred measuring range of the digital micro differential pressure gauge unit is 0–10 kPa, and the preferred resolution is 0.01 kPa, enabling accurate measurement of minute pressure differences in the absorption tube at a flow rate of 0.5 L / min.

[0011] The main control unit is electrically connected to the control module of the electronic soap film flow meter unit and the digital micro differential pressure gauge unit. The main control unit includes the following functional modules: The flow control module receives real-time flow values ​​from the electronic soap film flow meter unit and outputs adjustment signals to the flow regulating valve, forming a closed-loop flow control circuit. This module can implement a PID control algorithm or a simpler proportional control algorithm to automatically adjust the valve opening based on the deviation between the real-time flow value and the target value.

[0012] The pressure acquisition module is used to acquire the pressure difference value measured by the digital micro differential pressure gauge unit in real time.

[0013] The storage module is used to store the preset target flow rate (0.5 L / min) and the preset acceptable resistance range (e.g., 4.0 kPa to 6.0 kPa, which can be adjusted according to different standards).

[0014] The comparison and judgment module is used to compare the pressure difference value collected by the pressure acquisition module with the preset resistance qualified range stored in the storage module. If the pressure difference value falls within the qualified range, a "qualified" judgment result is generated; otherwise, a "unqualified" judgment result is generated.

[0015] The output module is used to output the pressure difference value and the judgment result. The output method can be LCD display, voice broadcast, print output, or transmission to an external computer via a data interface (such as RS232, USB, Bluetooth).

[0016] As a further improvement, the main control unit may also include an averaging module for continuously collecting multiple (e.g., 10) pressure difference values, removing the maximum and minimum values, and taking the arithmetic mean as the final resistance measurement result to eliminate instantaneous measurement fluctuations caused by bubble bursts or airflow disturbances.

[0017] As a further improvement, the main control unit may also include a data recording module, which is used to automatically record and store data such as the test time (accurate to the second), the number of the absorption tube under test (which can be entered by the operator via keyboard or barcode scanning), pressure difference, and judgment result for each test in an internal memory (such as Flash or SD card) or upload it to a cloud server to form a traceable test record.

[0018] As a further improvement, the electronic soap film flow meter unit can also include a temperature sensor and a pressure sensor, used to measure ambient temperature and ambient atmospheric pressure in real time, respectively. The control module also includes a volumetric flow conversion module, used to automatically convert the measured flow rate into the volumetric flow rate under standard conditions (0℃, 101.325 kPa) based on the ambient temperature and atmospheric pressure, thereby eliminating the influence of environmental factors on the flow measurement results and making the measurement results comparable.

[0019] A method for testing the resistance of a porous glass plate absorption tube based on the above system includes the following steps: S1: Install the absorber tube under test. The operator connects the inlet and outlet ends of the porous glass plate absorber tube under test to the inlet and outlet ports of the test interface unit using ordinary rubber tubing, ensuring a good seal at the connection.

[0020] S2: Automatic Flow Adjustment and Stabilization. After the operator starts the system, the flow control module of the main control unit sends a command to the electronic soap film flow meter unit, setting the target flow rate to 0.5 L / min. Upon receiving the command, the control module of the electronic soap film flow meter unit opens the flow regulating valve and starts the gas source unit. As the gas flows through the electronic soap film flow meter unit, a moving soap film is generated inside the soap film tube. The photoelectric sensor detects the time interval between the soap film passing through the upper and lower detection points, and the control module calculates the real-time flow rate. After receiving the real-time flow rate, the flow control module compares it with the target flow rate of 0.5 L / min. Based on the deviation, it outputs an adjustment signal to the flow regulating valve, increasing or decreasing the valve opening to bring the real-time flow rate closer to the target flow rate. After several adjustments, the flow rate stabilizes at 0.5 L / min, with the stabilization time typically not exceeding 10 seconds.

[0021] S3: Measure the pressure difference. After the flow rate stabilizes, the first and second pressure measuring ports of the digital micro differential pressure gauge unit measure the pressure at the inlet and outlet ports of the test interface unit, respectively. The difference between the two is calculated as the pressure difference between the two ends of the porous glass plate absorption tube under test, and this pressure difference is sent to the pressure acquisition module of the main control unit.

[0022] S4: Multi-point averaging (optional step). The pressure acquisition module continuously acquires 10 pressure difference values. The averaging module removes the maximum and minimum values ​​and takes the arithmetic mean of the remaining 8 values ​​as the final resistance measurement value.

[0023] S5: Automatic Acceptance Determination. The comparison and determination module compares the averaged resistance measurement value with the preset acceptable resistance range stored in the storage module. If the resistance measurement value falls within the acceptable range, a "Acceptable" result is generated; otherwise, a "Unacceptable" result is generated.

[0024] S6: Output and record results. The output module displays the resistance measurement value and the "pass" / "fail" judgment result on the LCD screen. At the same time, the data recording module automatically records and stores information such as the test time, the number of the tested absorption tube, the resistance measurement value, and the judgment result in the internal memory for easy reference and quality management later.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention uses an electronic soap film flow meter to replace the traditional rotor flow meter. It uses a photoelectric sensor to automatically detect the movement of the soap film, eliminating the visual error of manual reading. The electronic soap film flow meter is a volumetric flow meter, and its measurement accuracy is not affected by changes in the density, temperature, and pressure of the gas being measured. It can provide stable and reliable flow measurement results under various environmental conditions. It uses a digital micro differential pressure gauge to replace the traditional pointer-type negative pressure gauge, which improves the accuracy of pressure measurement. This invention forms a closed-loop control circuit by connecting the main control unit with the flow regulating valve of the electronic soap film flow meter, which can automatically regulate and stabilize the flow rate at the target value of 0.5 L / min without manual intervention. The operator only needs to start the test, and the system can automatically complete the entire process of flow regulation, stabilization and measurement, eliminating the operational errors and inconsistencies caused by manual flow adjustment. The main control unit of this invention has a pre-stored standard resistance acceptable range, which can automatically compare the measurement results with the standard values ​​and output the qualified / unqualified judgment results. There is no need for operators to memorize the standard values ​​or perform manual calculations, thus avoiding human judgment errors. The test data is automatically recorded and stored to form traceable test records, which meets the requirements of the laboratory quality management system for data integrity and traceability. Attached Figure Description

[0026] Figure 1 This is a flowchart of the testing method in an embodiment of the present invention; Figure 2 This is a block diagram of the overall structure of the present invention; Figure 3 This is a block diagram of the electronic soap film flow meter unit of the present invention; Figure 4 This is a block diagram of the test interface unit of the present invention; Figure 5 This is a block diagram of the digital micro differential pressure gauge unit of the present invention; Figure 6 This is a block diagram of the main control unit of the present invention.

[0027] In the diagram: 1. Gas source unit; 2. Electronic soap film flow meter unit; 21. Soap film tube; 22. Photoelectric sensor; 23. Flow regulating valve; 24. Control module; 25. Temperature sensor; 26. Pressure sensor; 3. Test interface unit; 31. Inlet port; 32. Outlet port; 4. Digital micro differential pressure gauge unit; 41. First pressure measuring port; 42. Second pressure measuring port; 5. Main control unit; 51. Flow control module; 52. Pressure acquisition module; 53. Storage module; 54. Comparison and judgment module; 55. Output module; 56. Averaging processing module; 57. Data recording module. Detailed Implementation

[0028] 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 a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0029] Examples, such as Figures 1-6As shown, a porous glass plate absorption tube resistance intelligent testing system includes a gas source unit 1, which provides the gas power required for testing. The electronic soap film flow meter unit 2 has its air inlet connected to the air outlet of the air source unit 1 via a pipeline. The electronic soap film flow meter unit 2 includes a soap film tube 21, a photoelectric sensor 22, a flow regulating valve 23, and a control module 24. The photoelectric sensor 22 is installed on the outside of the soap film tube 21 and is used to detect the time interval between the soap film passing through two detection points on the upper and lower parts of the soap film tube 21. The control module 24 calculates the real-time flow value based on the time interval and the known volume of the soap film tube 21, and compares the real-time flow value with the preset target flow value. Based on the comparison result, the opening degree of the flow regulating valve 23 is automatically adjusted. The test interface unit 3 has an air inlet port 31 and an air outlet port 32. The air inlet port 31 is connected to the air outlet of the electronic soap film flow meter unit 2 through a pipeline, and the air outlet port 32 is used to connect to the air outlet end of the porous glass plate absorption tube under test through a pipeline. The digital micro differential pressure gauge unit 4 has a first pressure measuring port 41 and a second pressure measuring port 42. The first pressure measuring port 41 is connected to the air inlet port 31 of the test interface unit 3 through a pipeline, and the second pressure measuring port 42 is connected to the air outlet port 32 of the test interface unit 3 through a pipeline. It is used to measure the pressure difference between the two ends of the porous glass plate absorption tube under test. The main control unit 5 is electrically connected to the control module 24 of the electronic soap film flow meter unit 2 and the digital micro differential pressure meter unit 4, respectively. The main control unit 5 includes: The flow control module 51 is used to receive the real-time flow value fed back by the electronic soap film flow meter unit 2 and output the adjustment signal to the flow regulating valve 23; The pressure acquisition module 52 is used to acquire the pressure difference value measured by the digital micro differential pressure gauge unit 4 in real time. Storage module 53 is used to store preset target flow rate values ​​and preset acceptable resistance ranges; The comparison and judgment module 54 is used to compare the pressure difference value collected by the pressure acquisition module 52 with the preset resistance qualified range stored in the storage module 53 to generate a judgment result.

[0030] The main control unit 5 also includes an averaging module 56, which is used to continuously collect multiple pressure difference values, remove the maximum and minimum values, and take the arithmetic mean as the final resistance measurement result.

[0031] The main control unit 5 also includes a data recording module 57, which is used to automatically record and store the test time, pressure difference and judgment results.

[0032] The electronic soap film flow meter unit 2 also includes a temperature sensor 25 and a pressure sensor 26. The control module 24 also includes a volumetric flow conversion module, which is used to convert the measured flow rate into the volumetric flow rate under standard conditions based on the ambient temperature and atmospheric pressure.

[0033] Test interface unit 3 is sealed to the porous glass plate absorption tube under test via a common rubber tube.

[0034] This invention also provides a testing method for an intelligent testing system for the resistance of porous glass plate absorber tubes, comprising the following steps: S1. Connect the porous glass plate absorption tube to be tested to the air inlet port 31 and air outlet port 32 of the test interface unit 3 through a pipeline; S2. Start the gas source unit 1. Through the control module 24 and flow regulating valve 23 of the electronic soap film flow meter unit 2, the gas flow rate is automatically adjusted and stabilized to the preset target flow rate value. S3. After the flow rate stabilizes, the pressure difference between the two ends of the porous glass plate absorption tube under test is measured by the digital micro differential pressure gauge unit 4, and the pressure difference is sent to the main control unit 5. S4. Subsequently, multiple pressure difference values ​​are continuously collected, and the arithmetic mean is taken after removing the maximum and minimum values ​​as the final resistance measurement result. S5. The comparison and judgment module 54 compares the pressure difference with the preset resistance qualified range stored in the storage module 53 and generates a judgment result. S6, the output module 55 of the main control unit 5 outputs the pressure difference and the judgment result.

[0035] The preferred embodiment also includes: The gas source unit 1 can be a vacuum pump, whose pumping rate is configured to maintain a stable flow rate of 0.5 L / min even under the condition of a maximum resistance of 6 kPa in the absorption tube. The known volume of the soap film tube 21 can be one of 10 mL, 20 mL or 50 mL, and the soap film tube 21 can be made of a high light transmittance glass material; The photoelectric sensor 22 can be a through-beam infrared photoelectric sensor 22 with a sampling frequency of not less than 100Hz; The flow regulating valve 23 can be a proportional solenoid valve or a needle valve driven by a stepper motor. The preset target flow rate value in the control module 24 can be 0.5 L / min, and its allowable fluctuation range can be ±0.02 L / min; The range of the digital micro differential pressure gauge unit 4 can be 0 to 10 kPa, the resolution can be 0.01 kPa, and the accuracy class can be ±0.5%FS. The average processing module 56 in the main control unit 5 can continuously collect 10 pressure difference values, remove one maximum value and one minimum value, and then take the arithmetic mean of the remaining 8 values. The main control unit 5 may also include an input module for receiving the number of the absorber tube under test or batch information input by the operator. The main control unit 5 may also include a communication module for uploading test data to an external computer or cloud server via RS232, USB, Bluetooth or WiFi. The main control unit 5 may also include a display module, which may be a touch LCD screen for real-time display of flow rate, pressure difference, judgment results and historical test records; The air inlet port 31 and air outlet port 32 of the test interface unit 3 can both be standard Luer connectors or pagoda connectors, and are connected to the porous glass plate absorption tube under test through a silicone rubber tube with an inner diameter of 4mm to 6mm. The system may also include a housing, in which the air source unit 1, electronic soap film flow meter unit 2, digital micro differential pressure meter unit 4 and main control unit 5 are all integrated and installed inside the housing. The air inlet port 31 and air outlet port 32 of the test interface unit 3, as well as the display module and input module of the main control unit 5, are embedded on the housing panel. The system may also include a power supply unit for supplying power to the gas source unit 1, the electronic soap film flow meter unit 2, the digital micro differential pressure meter unit 4, and the main control unit 5.

[0036] It should be further noted that the system described in this invention refers to an integrated whole for automatically testing the resistance of a porous glass plate absorption tube, consisting of a gas source unit 1, an electronic soap film flow meter unit 2, a test interface unit 3, a digital micro differential pressure meter unit 4, and a main control unit 5 connected in a specific manner.

[0037] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A smart testing system for the resistance of a porous glass plate absorption tube, characterized in that, include: Gas source unit (1) is used to provide the gas power required for testing; The electronic soap film flow meter unit (2) has its air inlet connected to the air outlet of the air source unit (1) through a pipeline. The electronic soap film flow meter unit (2) includes a soap film tube (21), a photoelectric sensor (22), a flow regulating valve (23), and a control module (24). The photoelectric sensor (22) is installed on the outside of the soap film tube (21) to detect the time interval between the soap film passing through two detection points on the upper and lower parts of the soap film tube (21). The control module (24) calculates the real-time flow value based on the time interval and the known volume of the soap film tube (21), compares the real-time flow value with the preset target flow value, and automatically adjusts the opening of the flow regulating valve (23) according to the comparison result. The test interface unit (3) has an air inlet port (31) and an air outlet port (32). The air inlet port (31) is connected to the air outlet of the electronic soap film flow meter unit (2) through a pipeline, and the air outlet port (32) is used to connect to the air outlet end of the porous glass plate absorption tube under test through a pipeline. The digital micro differential pressure gauge unit (4) has a first pressure measuring port (41) and a second pressure measuring port (42). The first pressure measuring port (41) is connected to the air inlet port (31) of the test interface unit (3) through a pipeline, and the second pressure measuring port (42) is connected to the air outlet port (32) of the test interface unit (3) through a pipeline. It is used to measure the pressure difference between the two ends of the porous glass plate absorption tube under test. The main control unit (5) is electrically connected to the control module (24) of the electronic soap film flow meter unit (2) and the digital micro differential pressure meter unit (4), respectively. The main control unit (5) includes: The flow control module (51) is used to receive the real-time flow value fed back by the electronic soap film flow meter unit (2) and output the adjustment signal to the flow regulating valve (23); The pressure acquisition module (52) is used to acquire the pressure difference value measured by the digital micro differential pressure gauge unit (4) in real time; Storage module (53) is used to store the preset target flow rate value and the preset resistance acceptable range; The comparison and judgment module (54) is used to compare the pressure difference value collected by the pressure acquisition module (52) with the preset resistance qualified range stored in the storage module (53) to generate a judgment result.

2. The intelligent testing system for the resistance of a porous glass plate absorption tube according to claim 1, characterized in that, The main control unit (5) also includes an averaging module (56), which is used to continuously collect multiple pressure difference values, remove the maximum and minimum values, and take the arithmetic mean as the final resistance measurement result.

3. The intelligent testing system for the resistance of a porous glass plate absorption tube according to claim 1, characterized in that, The main control unit (5) also includes a data recording module (57) for automatically recording and storing the test time, pressure difference and judgment result.

4. The intelligent testing system for the resistance of a porous glass plate absorption tube according to claim 1, characterized in that, The electronic soap film flow meter unit (2) also includes a temperature sensor (25) and a pressure sensor (26). The control module (24) also includes a volumetric flow conversion module, which is used to convert the measured flow rate into the volumetric flow rate under standard conditions based on the ambient temperature and atmospheric pressure.

5. The intelligent testing system for the resistance of a porous glass plate absorption tube according to claim 1, characterized in that, The test interface unit (3) is sealed to the porous glass plate absorption tube under test through a common rubber tube.

6. A test method for a porous glass plate absorber tube resistance intelligent testing system, employing the porous glass plate absorber tube resistance intelligent testing system described in claims 1-5, characterized in that... Includes the following steps: S1. Connect the porous glass plate absorption tube to be tested to the air inlet (31) and air outlet (32) of the test interface unit (3) through a pipeline. S2. Start the gas source unit (1), and through the control module (24) and flow regulating valve (23) of the electronic soap film flow meter unit (2), automatically adjust and stabilize the gas flow to the preset target flow value; S3. After the flow rate stabilizes, the pressure difference between the two ends of the porous glass plate absorption tube under test is measured by the digital micro differential pressure gauge unit (4), and the pressure difference is sent to the main control unit (5). S4. Subsequently, multiple pressure difference values ​​are continuously collected, and the arithmetic mean is taken after removing the maximum and minimum values ​​as the final resistance measurement result. S5. The comparison and judgment module (54) compares the resistance measurement value with the preset resistance qualified range stored in the storage module (53) and generates a judgment result. S6. The output module (55) of the main control unit (5) outputs the pressure difference and the judgment result.

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