A high-precision micro-pressure difference measurement method and system

Abstract

The present invention provides a high-precision micro-pressure differential measurement method and system, the system includes a measurement terminal array and a control terminal connected to the measurement terminal array in communication; the measurement terminal array includes measurement terminals respectively arranged at a plurality of different measurement points in a plurality of spaces to be measured, each of the measurement terminals is used to synchronously measure the absolute pressure of the respective measurement points and send the measurement data to the control terminal; the control terminal is used to receive the measurement data uploaded by each measurement terminal in the measurement terminal array, calibrate the absolute pressure of each measurement point according to the measurement data and fluctuation, and calculate the actual pressure difference value of each point according to the calibrated absolute pressure and a preset measurement reference value. The present invention can not only realize the measurement of the micro-pressure differential distribution of multiple spatial measurement points, but also eliminate the error caused by the change in ambient temperature when measuring the micro-pressure differential, thereby improving the measurement accuracy of the micro-pressure differential.

Description

Technical Field

[0001] The present invention relates to the technical field of environmental pressure difference measurement, and in particular to a high-precision micro-pressure difference measurement method and system. Background Art

[0002] Forming positive pressure in clean space, negative pressure in contaminated space, and pressure gradient in transition zone can help effectively ensure the safety of clean space, avoid the spread of pollution, and have a good protective effect. Such measures are often used in civil air defense projects, hospitals, high-level biological laboratories and other projects. Usually, the effect of using air pressure difference to implement safety protection is often related to the pressure difference distribution of multiple rooms or channels. The greater the pressure difference, the better the protection effect, but it also means higher protection costs. Therefore, in order to ensure the effectiveness of positive or negative pressure measures under appropriate pressure difference conditions, it is necessary to use a pressure difference measurement system to monitor the pressure difference distribution of each area in real time.

[0003] However, existing monitoring methods usually only involve monitoring the pressure difference between the innermost and outermost parts, ignoring the monitoring of the pressure difference distribution in the transition area between the inner and outer parts, which means that the protection effect of the transition area is unclear and the risk of pollutant invasion will increase during the process of personnel entering and leaving. The reason why existing monitoring methods have the above problems is that the measurement accuracy of the micro-pressure difference in multiple spaces is high, the technical difficulty is high, and there is a lack of available equipment, making it impossible to comprehensively monitor the micro-pressure difference in multiple spaces. Summary of the invention

[0004] In view of the fact that the existing pressure difference monitoring means cannot meet the requirements of high-precision measurement of multi-space micro-pressure differences and the technical problem of high difficulty in measurement technology, the present invention is proposed to provide a method and system for achieving high-precision micro-pressure difference measurement that overcomes the above problems or at least partially solves the above problems.

[0005] In one aspect of the present invention, a high-precision micro-pressure differential measurement system is provided, the system comprising a measurement terminal array and a control terminal communicatively connected to the measurement terminal array;

[0006] The measuring terminal array includes measuring terminals respectively arranged at a plurality of different measuring points of a plurality of spaces to be measured, each of the measuring terminals including: an air storage module for storing reference air to form a reference pressure; a temperature measuring module for measuring the ambient temperature of the air storage and recording the measurement time, and sending the ambient temperature and the temperature measurement time as measurement data to the control terminal; a pressure measuring module for measuring the absolute pressure at the point and the reference pressure in the air storage and recording the pressure measurement time, and sending the absolute pressure, the reference pressure in the air storage and the pressure measurement time as measurement data to the control terminal;

[0007] The control terminal is used to receive measurement data uploaded by each measurement terminal in the measurement terminal array, calibrate the absolute pressure of each measurement point according to the measurement data and fluctuation conditions, calculate the actual pressure difference value of each point according to the calibrated absolute pressure and a preset measurement reference value, store and display the actual pressure difference value, and improve the measurement accuracy of micro-pressure difference.

[0008] Furthermore, the measurement terminal includes:

[0009] A first transmission module, used to communicate with the control terminal to send the measurement data of the temperature measurement module and the pressure measurement module to the control terminal in the form of wireless transmission;

[0010] A first digital display module, used to display the measurement data of the temperature measurement module and the pressure measurement module;

[0011] A first storage module, used for storing the measurement data of the temperature measurement module and the pressure measurement module;

[0012] The first power supply module is used to supply power to each component module in the measurement terminal.

[0013] Furthermore, the control terminal includes:

[0014] A second transmission module, used for communicating with the measurement terminals to receive the measurement data sent by each measurement terminal and send the measurement data to the data processor;

[0015] A data processor, used to calibrate the absolute pressure of each measuring point according to the measurement data and fluctuation conditions, and calculate the actual pressure difference value of each point according to the calibrated absolute pressure and a preset measurement reference value;

[0016] The second digital display module is used to display the measurement data sent by each measurement terminal and the pressure difference value of each measurement point calculated by the data processor;

[0017] A second storage module is used to store the measurement data sent by each measurement terminal and the pressure difference value calculated by the data processor;

[0018] The second power supply module is used to supply power to each component module in the control terminal.

[0019] Another aspect of the present invention provides a high-precision micro-pressure difference measurement method, which is applicable to the high-precision micro-pressure difference measurement system as described above, and the method comprises:

[0020] Acquire measurement data of the measurement points where each measurement terminal in the measurement terminal array is located; the measurement data includes ambient temperature, temperature measurement time, absolute pressure, reference pressure in the gas storage bin, and pressure measurement time;

[0021] Calculate the relative pressure difference between the absolute pressure at the measuring point where each measuring terminal is located and the reference pressure in the gas storage tank;

[0022] Determine whether the fluctuation of the absolute pressure at each measuring point meets the preset measurement reference value selection conditions;

[0023] When the fluctuation of the absolute pressure meets the selection condition of the measurement reference value, the absolute pressure of each measurement point is calibrated according to the measurement data and the relative pressure difference of each measurement point, and the actual pressure difference value of each point is calculated according to the calibrated absolute pressure and the preset measurement reference value. The actual pressure difference value is stored and displayed to improve the measurement accuracy of micro-pressure difference.

[0024] Furthermore, the relative pressure difference between the absolute pressure at the measuring point where each measuring terminal is located and the reference pressure in the gas storage bin is calculated, including:

[0025] Calculating the relative pressure difference according to a preset first calculation model;

[0026] The preset first calculation model is: relative pressure difference = the absolute pressure at each measuring point - the reference pressure in the gas storage bin.

[0027] Furthermore, the absolute pressure at each measuring point is calibrated according to the measurement data and the relative pressure difference, including:

[0028] Calibrate the absolute pressure at each measuring point according to a preset second calculation model;

[0029] The preset second calculation model is:

[0030] Among them, P' t Represents the absolute pressure at each measuring point after calibration, P t represents the relative pressure difference calculated according to the first calculation model; T 0 Indicates the initial ambient temperature value in the gas storage bin; T i Indicates the ambient temperature value after the change in the gas storage tank; p 0 Indicates the ambient temperature is T 0 The reference pressure measured in the gas storage tank at .

[0031] Furthermore, after calibrating the absolute pressure at each measuring point according to the measurement data and the relative pressure difference, the method further includes:

[0032] Sampling the absolute pressure of each calibrated measuring point in the measurement data uploaded by the measurement terminal;

[0033] Detecting whether a first target selection terminal with a measurement reference value is preset;

[0034] If so, the absolute pressure of each measuring point after calibration in the measurement data uploaded by the first target selection terminal is used as the preset measurement reference value; otherwise, the second target selection terminal for the measurement reference value is selected according to the user's specified operation, and the absolute pressure of each measuring point after calibration sampled from the second target selection terminal is used as the preset measurement reference value.

[0035] Furthermore, the actual pressure difference value at each point is calculated based on the calibrated absolute pressure and the preset measurement reference value, including:

[0036] Calculate the actual pressure difference value at each point according to the preset third calculation model;

[0037] The preset third calculation model is: actual pressure difference value = the absolute pressure of each measuring point after calibration - preset measurement reference value.

[0038] Furthermore, before obtaining the measurement data of the measurement points where each measurement terminal in the measurement terminal array is located, the method further includes:

[0039] Turning on each measuring terminal and control terminal in the measuring terminal array, and controlling the measuring terminal and control terminal to perform a functional self-check to ensure that the measuring terminal can normally perform a measuring operation and the control terminal can normally perform a control operation;

[0040] After the measuring terminal and the control terminal are turned on, a wireless connection is established between the measuring terminal and the control terminal to ensure synchronous transmission of measurement data.

[0041] Furthermore, judging whether the fluctuation of the absolute pressure at each measuring point satisfies the preset measurement reference value selection condition includes:

[0042] Calculate the fluctuation range of the absolute pressure at each measuring point within a preset time period;

[0043] Determining whether the fluctuation range is less than a preset fluctuation range threshold;

[0044] When the fluctuation range is less than a preset fluctuation range threshold, it is determined that the fluctuation of the absolute pressure at each measuring point satisfies a preset measurement reference value selection condition;

[0045] When the fluctuation range is greater than or equal to a preset fluctuation range threshold, it is determined that the fluctuation of the absolute pressure at each measuring point does not satisfy a preset measurement reference value selection condition.

[0046] The embodiments of the present invention provide a high-precision micro-pressure difference measurement method and system, which can improve the measurement accuracy of micro-pressure differences, reduce the technical difficulty of measuring multi-space micro-pressure differences, and achieve accurate measurement and convenient use.

[0047] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the information in the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same meaning. In the accompanying drawings:

[0049] Figure 1 This is a structural block diagram of a high-precision micro-pressure difference measurement system proposed in an embodiment of the present invention;

[0050] Figure 2 A working principle diagram of a high-precision micro-pressure difference measurement system proposed in an embodiment of the present invention;

[0051] Figure 3 This is a flow chart of the high-precision micro-pressure difference measurement method proposed in an embodiment of the present invention. DETAILED DESCRIPTION

[0052] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0053] Those skilled in the art will appreciate that, unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0054] Those skilled in the art will appreciate that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined.

[0055] Generally, the positive pressure value formed in the three-defense area of ​​civil air defense projects is generally 50Pa~150Pa, while the positive pressure value formed in the three-defense area of ​​ships is about 500Pa. The above transition zone involves more than 10 functional rooms; the negative pressure value of the hospital isolation area is generally not less than 5~10Pa, and the transition zone usually involves 2~4 channels; in high-level biosafety laboratories, there are more rooms involving pressure difference distribution. Among them, the pressure difference between the BSL-4 main laboratory and the adjacent rooms from the outdoor to the indoor direction can be set to -20~-25Pa, and the negative pressure difference with the atmosphere is -50Pa or lower; the negative pressure difference between the ABSL-4 main laboratory and the atmosphere is -60Pa or lower, and the autopsy room is -65Pa or lower. The pressure difference between the BSL-3 main laboratory and the adjacent room can be set to -10~-20Pa, and the pressure difference with the atmosphere can be -30Pa or lower; the negative pressure difference between the ABSL-3 main laboratory and the atmosphere is -40Pa or lower, and the autopsy room is -50Pa or lower. In addition, the buffer room and the adjacent room can be -10 to -15 Pa, and the other rooms can be 5 to 10 Pa lower. It can be seen that the effect of using air pressure difference to implement safety protection is often related to the pressure difference distribution of multiple rooms or channels.

[0056] At present, there are two main ways to measure the pressure difference distribution: one is the direct method, which connects two measuring points to the pressure difference meter to directly measure the pressure difference of the two air ducts. This method requires the preset measuring tube in advance. For the measuring points without the preset pressure difference measuring tube, the direct method cannot be used for measurement; the second is the indirect method, which uses a set of measuring equipment to successively measure the absolute pressure at different points to determine the pressure difference distribution at different points. Since the range of the equipment required to measure the absolute pressure is usually greater than the standard atmospheric pressure, it is easy to cause a large system error when using this equipment to measure a smaller pressure difference. In addition, when using a set of measuring equipment to measure successively, there will be errors if the measurement time is not synchronized. Therefore, the accuracy of the environmental pressure difference measured by the indirect method is not high and cannot meet the needs of high-precision measurement.

[0057] Therefore, the present invention designs a high-precision micro-pressure difference measurement method and system that is accurate in measurement, easy to use, and applicable to multiple spaces.

[0058] Figure 1 The structural block diagram of the high-precision micro-pressure difference measurement system proposed in the embodiment of the present invention is schematically shown. Figure 1 , the high-precision micro-pressure difference measurement system proposed in the embodiment of the present invention comprises: a measurement terminal array and a control terminal communicatively connected to the measurement terminal array;

[0059] The measuring terminal array includes measuring terminals respectively arranged at a plurality of different measuring points of a plurality of spaces to be measured, each of the measuring terminals including: an air storage module for storing reference air to form a reference pressure; a temperature measuring module for measuring the ambient temperature of the air storage and recording the measurement time, and sending the ambient temperature and the temperature measurement time as measurement data to the control terminal; a pressure measuring module for measuring the absolute pressure at the point and the reference pressure in the air storage and recording the pressure measurement time, and sending the absolute pressure, the reference pressure in the air storage and the pressure measurement time as measurement data to the control terminal;

[0060] The control terminal is used to receive measurement data uploaded by each measurement terminal in the measurement terminal array, calibrate the absolute pressure of each measurement point according to the measurement data and fluctuation conditions, calculate the actual pressure difference value of each point according to the calibrated absolute pressure and a preset measurement reference value, store and display the actual pressure difference value, and improve the measurement accuracy of micro-pressure difference.

[0061] In this embodiment, the measurement terminal array includes at least two measurement terminals. In specific implementation, it can be set to 2 to 20 measurement terminals, preferably 5 to 20 measurement terminals; the control terminal can be set to 1, which is specifically used to collect measurement data from each measurement terminal wirelessly, and take the absolute pressure value of a certain point as a reference, and calculate the actual pressure difference distribution of each point according to the calibrated absolute pressure and the preset measurement reference value.

[0062] Specifically, in the embodiment of the present invention, the temperature measurement module 202 is used to accurately measure the ambient temperature of the gas storage bin, and use the ambient temperature and temperature measurement time as measurement data, and send them to the first digital display module 205, the first transmission module 204 and the first storage module 206 in the form of electronic signals, and the required power is supplied by the first power module 207; the pressure measurement module 203 is used to measure the absolute pressure at the point and the reference pressure in the gas storage bin and record the pressure measurement time, and send the measurement data and pressure measurement time to the first digital display module 205, the first transmission module 204 and the first storage module 206, as well as the control terminal in the form of electronic signals, and the required power is supplied by the first power module 207.

[0063] In an embodiment of the present invention, the measurement terminal also includes a first transmission module 204; the first transmission module 204 is used to communicate with the control terminal to send the measurement data of the temperature measurement module 202 and the pressure measurement module 203 to the control terminal in the form of wireless transmission; specifically, the first transmission module 204 receives data signals from the temperature measurement module 202 and the pressure measurement module 203, and sends the data signals in a wireless form, and the required power is supplied by the first power supply module 207.

[0064] In an embodiment of the present invention, the measuring terminal also includes a first digital display module 205; the first digital display module 205 is used to display the measurement data of the temperature measurement module 202 and the pressure measurement module 203; specifically, the first digital display module 205 receives data signals from the temperature measurement module 202 and the pressure measurement module 203, and displays the measurement data and the pressure measurement time, and the required power is supplied by the first power supply module 207.

[0065] In an embodiment of the present invention, the measurement terminal also includes a first storage module 206; the first storage module 206 is used to store the measurement data of the temperature measurement module 202 and the pressure measurement module 203; specifically, the first storage module 206 receives data signals from the temperature measurement module 202 and the pressure measurement module 203, and stores the measurement data and the pressure measurement time, and the required power is supplied by the first power supply module 207.

[0066] In the embodiment of the present invention, the measuring terminal further includes a first power module 207; the first power module 207 is used to supply power to each component module in the measuring terminal.

[0067] In an embodiment of the present invention, the control terminal includes: a second transmission module 301; the second transmission module 301 is used to communicate with the measurement terminal to receive the measurement data sent by each measurement terminal, and send it to the data processor 302; specifically, the second transmission module 301 receives the data signal sent by the first transmission module 204 in a wireless form, and sends the data signal to the data processor 302 and the second storage module 304, and the required power is supplied by the second power supply module 305.

[0068] In an embodiment of the present invention, the measuring terminal also includes a data processor 302; the data processor 302 is used to monitor the fluctuation of the absolute pressure at each measuring point according to the measurement data, and calibrate the absolute pressure at each measuring point according to the measurement data and the fluctuation, and calculate the actual pressure difference value of each point according to the calibrated absolute pressure and a preset measurement reference value; specifically, the data processor 302 receives the data signal sent by the second transmission module 301, and performs data processing operations such as the absolute pressure of the calibration point and the actual pressure difference value of the calculation point according to the operation instruction, and sends the results before and after the processing to the second digital display module 303 and the second storage module 304 in the form of electronic signals, and the required power is supplied by the second power supply module 305.

[0069] In an embodiment of the present invention, the control terminal also includes a second digital display module 303; the second digital display module 303 is used to display the measurement data sent by each measurement terminal and the pressure difference value of each measurement point calculated by the data processor 302; specifically, the second digital display module 303 receives a data signal from the data processor 302, and displays measurement data such as ambient temperature data, reference pressure data, absolute pressure data of the point, temperature measurement time, pressure measurement time and actual pressure difference value of the point, and the required power is supplied by the second power supply module 305.

[0070] In the embodiment of the present invention, the control terminal further includes a second storage module 304; the second storage module 304 is used to store the measurement data sent by each measurement terminal and the pressure difference value calculated by the data processor 302; specifically, the second storage module 304 receives the data signal from the second transmission module 301 of the control terminal, and stores the measurement data and the actual pressure difference value of the point. In addition, the second storage module 304 also has a data import function, and the required power is supplied by the power module.

[0071] In the embodiment of the present invention, the control terminal further includes a second power module 305; the second power module 305 is used to supply power to each component module in the control terminal.

[0072] The high-precision micro-pressure difference measurement system proposed in the embodiment of the present invention can improve the measurement accuracy of micro-pressure differences, reduce the technical difficulty of measuring multi-space micro-pressure differences, and achieve accurate measurement and convenient use.

[0073] In the embodiment of the present invention, preferably, the prefabricated gas in the gas storage bin is filled with air or inert gas, and the pressure is 90-150 kPa. The temperature measurement module 202 of the measuring terminal preferably has a range of -40-160°C and an accuracy of 0.015-0.025°C. The first transmission module 204 and the second transmission module 301 preferably use WIFI or Bluetooth 5.0 or above, with a transmission distance of 100-150m and a transmission speed of 1-10Mbps; if necessary, additional relay equipment can be provided to meet the actual transmission distance requirements. The battery capacity of the first power module 207 of the measuring terminal is preferably 1000-5000mAh, and the voltage is preferably 1.0-2.0V. The battery capacity of the second power module 305 of the control terminal is preferably 10000-50000mAh, and the voltage is preferably 1.0-2.0V. The first digital display module 205 of the measuring terminal is preferably an LCD or LED liquid crystal display module for real-time display of measurement time and measurement data. The second digital display module 303 of the control terminal is preferably an LCD or LED liquid crystal display module for real-time display of the measurement time, measurement data and actual pressure difference value. The lower limit of the range of the pressure measurement module 203 of the measurement terminal is 500Pa, the upper limit is 1000KPa, and the accuracy is 0.05% to 2%. The measurement accuracy is determined according to the high-precision pressure difference measurement requirements of multiple spaces, and the pressure difference measurement requirements are generally 0 to 500Pa micro-pressure differences. The capacity of the first storage module 206 of the measurement terminal is preferably 1 to 5G, and the second storage module 304 of the control terminal is preferably 16 to 64G. The data processor 302 of the control terminal can be implemented using existing microprocessors, and its internal processing program is preferably compiled in languages ​​such as R, python, Julia, and Java to meet the processing needs of the pressure difference data. In this embodiment, the example parameters, devices, and programming languages ​​listed above can be freely set according to the actual application needs, and the present invention does not specifically limit this.

[0074] Figure 2 The working principle diagram of the high-precision micro-pressure difference measurement system proposed in the embodiment of the present invention is schematically shown. Figure 2In a specific embodiment, the measurement terminal array of the measurement system includes measurement terminal 1#, measurement terminal 2#, measurement terminal 3#, ..., measurement terminal n#, 2<n≤20, the absolute pressure measured by measurement terminal 1# is expressed as P1, and the ambient temperature of the gas storage bin is expressed as T1, the absolute pressure measured by measurement terminal 2# is expressed as P2, and the ambient temperature of the gas storage bin is expressed as T2, the absolute pressure measured by measurement terminal 3# is expressed as P3, and the ambient temperature of the gas storage bin is expressed as T3, ..., the absolute pressure measured by measurement terminal n# is expressed as Pn, and the ambient temperature of the gas storage bin is expressed as Tn; in the measurement During the measurement process, the measurement terminal array sends P1~Pn, T1~Tn to the control terminal by wireless transmission; after receiving the absolute pressure and the ambient temperature of the gas storage bin, the control terminal determines whether the fluctuation of the absolute pressure meets the selection conditions of the measurement reference value. When the fluctuation range of the absolute pressure within the preset time period is less than the preset fluctuation range threshold, it is determined that the selection conditions of the measurement reference value are met; further, the absolute pressure of each measuring point is calibrated according to the measurement data and fluctuation conditions, and the actual pressure difference value of each point is calculated according to the calibrated absolute pressure and the preset measurement reference value. Figure 2 As shown, the calibrated absolute pressure at the point where the measuring terminal 1# is located is P'1, the calibrated absolute pressure at the point where the measuring terminal 2# is located is P'2, the calibrated absolute pressure at the point where the measuring terminal 3# is located is P'3, ..., the calibrated absolute pressure at the point where the measuring terminal n# is located is P'n; the actual pressure difference at the point where the measuring terminal 1# is located is ΔP 1 The actual pressure difference at the measuring terminal 2# is ΔP 2 The actual pressure difference at the measuring terminal 3# is ΔP 3 ,..., the actual pressure difference at the measuring terminal n# is ΔP n In this embodiment, the preset duration can be set to 30 seconds, and the preset fluctuation range threshold can be set to 5%.

[0075] In a specific embodiment, 15 measurement terminals can be set up to form a measurement terminal array, 1 control terminal can be set up, and a wireless connection can be established between the measurement terminal array and the control terminal. To ensure the measurement accuracy of the measurement terminal, the prefabricated gas in the gas storage bin is filled with 95-105kPa of air or inert gas; the temperature measurement module 202 has a range of -20-60°C and an accuracy of 0.015°C; the pressure measurement module 203 has a range of 0-500kPa and an accuracy of 0.05%, and the measurement data strictly corresponds to the time. To ensure the wireless transmission effect, the first transmission module 204 uses WIFI connection, the transmission distance is preferably 120m, and the transmission speed is 2Mbps; when the transmission distance exceeds 120m or the channel shielding is strong, a relay device is added to strengthen the wireless data transmission. In order to reduce the manufacturing cost of the present invention, the first power module 207 of the measuring terminal is preferably 2000mAh and the voltage is 1.5V; the second power module 305 of the control terminal is preferably 20000mAh and the voltage is 1.5V; the first storage module 206 of the measuring terminal is preferably 2G; the second storage module 304 of the control terminal is preferably 32G. The parameters, equipment and other parameters, equipment and programming languages ​​required for the measurement as described above can be freely set and selected according to the actual application needs, and the present invention does not impose specific restrictions on this.

[0076] The high-precision micro-pressure differential measurement system proposed in the embodiment of the present invention is cleverly designed, easy to use, low in production cost, and high in measurement accuracy. In addition, the present invention does not require reserved measuring tubes and is adaptable to high-precision micro-pressure differential measurement in multiple space environments. In particular, it can overcome the technical defects of the existing high-precision micro-pressure differential measurement system due to the high difficulty of measurement technology and the lack of equipment, and the poor pressure differential monitoring effect due to the neglect of pressure differential monitoring in the transition area. It has a wide range of applications and is convenient and efficient.

[0077] Figure 3 The flowchart of the high-precision micro-pressure difference measurement method proposed in the embodiment of the present invention is schematically shown. Figure 3 The high-precision micro-pressure difference measurement method proposed in the embodiment of the present invention specifically includes the following steps:

[0078] S11. Acquire measurement data of the measurement points where each measurement terminal in the measurement terminal array is located; the measurement data includes ambient temperature, temperature measurement time, absolute pressure, reference pressure in the gas storage bin, and pressure measurement time.

[0079] S12. Calculate the relative pressure difference between the absolute pressure at the measuring point where each measuring terminal is located and the reference pressure in the gas storage bin.

[0080] In an embodiment of the present invention, the relative pressure difference between the absolute pressure at the measuring point where each measuring terminal is located and the reference pressure in the gas storage bin is calculated, including: calculating the relative pressure difference according to a preset first calculation model; the preset first calculation model is: relative pressure difference = the absolute pressure at each measuring point - the reference pressure in the gas storage bin.

[0081] S13. Determine whether the fluctuation of the absolute pressure at each measuring point satisfies the preset measurement reference value selection condition.

[0082] S14. When the fluctuation of the absolute pressure meets the selection condition of the measurement reference value, the absolute pressure of each measurement point is calibrated according to the measurement data and the relative pressure difference of each measurement point, and the actual pressure difference value of each point is calculated according to the calibrated absolute pressure and the preset measurement reference value, and the actual pressure difference value is stored and displayed to improve the measurement accuracy of micro-pressure difference.

[0083] In an embodiment of the present invention, calibrating the absolute pressure of each measuring point according to the measurement data and the relative pressure difference includes: calibrating the absolute pressure of each measuring point according to a preset second calculation model;

[0084] The preset second calculation model is:

[0085] Among them, P' t Represents the absolute pressure at each measuring point after calibration, P t represents the relative pressure difference calculated according to the first calculation model; T 0 Indicates the initial ambient temperature value in the gas storage bin; T i Indicates the ambient temperature value after the change in the gas storage tank; p 0 Indicates the ambient temperature is T 0 The reference pressure measured in the gas storage tank at .

[0086] In an embodiment of the present invention, after calibrating the absolute pressure of each measuring point according to the measurement data and the relative pressure difference, the method further includes: sampling the absolute pressure of each measuring point after calibration in the measurement data uploaded by the measurement terminal; detecting whether there is a first target selection terminal with a measurement reference value preset; if so, using the absolute pressure of each measuring point after calibration in the measurement data uploaded by the first target selection terminal as the preset measurement reference value, otherwise selecting the second target selection terminal of the measurement reference value according to the user's specified operation, and using the absolute pressure of each measuring point after calibration sampled from the second target selection terminal as the preset measurement reference value.

[0087] The first target selection terminal for the measurement reference value is a measurement terminal set by default for the control terminal, and is used to realize automatic selection of the measurement reference value.

[0088] In an embodiment of the present invention, the actual pressure difference value of each point is calculated based on the calibrated absolute pressure and the preset measurement reference value, including: calculating the actual pressure difference value of each point based on a preset third calculation model; the preset third calculation model is: actual pressure difference value = the absolute pressure of each measurement point after calibration - the preset measurement reference value.

[0089] A high-precision micro-pressure difference measurement method proposed in an embodiment of the present invention can not only measure the micro-pressure difference distribution of multiple spatial measurement points, but also eliminate the errors caused by ambient temperature changes during micro-pressure difference measurement, thereby improving the measurement accuracy of micro-pressure differences.

[0090] It is understandable that after pre-filling, the volume of air or inert gas inside the gas storage bin remains unchanged. When the initial ambient temperature in the gas storage bin is T 0 When the reference pressure measured in the gas storage tank is also p 0 As the environment around the gas storage tank changes, the air or inert gas inside expands and contracts, causing the pressure to change. For example, according to the gas state equation:

[0091] pV=nRT;……………………………………………………(1)

[0092] In formula (1), p is pressure (Pa), V is gas volume (m 3 ), T is temperature (K), n is the amount of gas (mol), R is the molar gas constant, also called the universal gas constant, with the unit of J / (mol.K); assuming that the air temperature in the gas storage increases by 1°C, the change in internal pressure will be:

[0093]

[0094] In the process of measuring ambient temperature, in addition to obtaining the measurement results, in order to ensure the measurement accuracy, it is also necessary to pay attention to the temperature change and the measurement error of the thermometer at different temperatures. Usually, in the range of -40 to 160°C, the accuracy of the thermometer can reach 0.015 to 0.025°C. The change in the reference pressure in the gas storage tank caused by the accuracy of the thermometer is generally 5.03 to 8.39Pa. The measurement error of the thermometer is acceptable for measurements in the range of 0 to 500Pa.

[0095] In formula (2), assuming that the air temperature in the gas storage tank is 25°C, according to Kelvin K = Celsius °C + 273.15, we know that T 0 =273.15+25℃, p 0 =105 Pa, then Δp = 335.4 Pa. It can be seen that the ambient temperature has a great influence on the reference air pressure in the gas storage tank. Even a 0.1°C ambient temperature change will cause a 30.56Pa pressure change. This error is unacceptable for measurements in the range of 0 to 500Pa and must be calibrated.

[0096] In the embodiment of the present invention, the second calculation model:

[0097] It can be derived through the following steps:

[0098] When the ambient temperature in the gas storage tank is T 0 The actual pressure difference value at each measuring point can be defined as P' t :

[0099] P' t =P r -p 0 ……………………………………(3)

[0100] Among them, P r is the absolute pressure at each measuring point, p 0 The temperature is T 0 The reference pressure measured in the gas storage tank at 1000 rpm.

[0101] When the ambient temperature in the gas storage tank is T i When the actual pressure difference value of each measuring point is P t :

[0102] P t =P r -p i ……………………………………(4)

[0103] Among them, P r is the absolute pressure at each measuring point, p i The ambient temperature is T i The reference pressure measured in the gas storage tank at 1000 rpm.

[0104] p i and p 0 The corresponding relationship is:

[0105]

[0106] The second calculation model can be obtained by equations (3) to (5);

[0107]

[0108] From the second calculation model shown in formula (6), it can be seen that when the ambient temperature is higher than T0 When the reference pressure in the gas storage tank increases, the actual pressure difference value P t Too small, so a positive value needs to be added when correcting the pressure difference; when the ambient temperature is lower than T 0 When the reference pressure in the gas storage tank decreases, the actual pressure difference value P t The positive and / or negative value is calculated based on the initial ambient temperature T in formula (6). 0 And the temperature after the ambient temperature changes T i The size of the point is determined by the present invention, which is not specifically limited or illustrated. Therefore, after the above calibration, the absolute pressure of the point is converted to p 0 The calibrated absolute pressure value is used as the reference.

[0109] In the embodiment of the present invention, the first target selection terminal of the measurement reference value may be the first measurement terminal. For example, the absolute pressure P'1 of each measurement point after calibration in the measurement data uploaded by the measurement terminal 1# is used as the measurement reference value. In practical applications, the first target selection terminal of the measurement reference value may be set to any measurement terminal by default, and the present invention does not specifically limit this.

[0110] In an embodiment of the present invention, before obtaining measurement data measured by the measurement terminal array, the method also includes: turning on each measurement terminal and control terminal in the measurement terminal array, and controlling the measurement terminal and control terminal to perform a functional self-check to ensure that the measurement terminal can normally perform measurement operations and the control terminal can normally perform control operations; after the measurement terminal and the control terminal are turned on, establishing a wireless connection between the measurement terminal and the control terminal to ensure synchronous transmission of measurement data.

[0111] In a specific embodiment, in order to ensure that the pipeline of the measuring terminal is unobstructed, the measuring terminal can perform measurement operations normally, and the control terminal can perform control operations normally, environmental detection and functional self-test are required when the measuring terminal and the control terminal are turned on; the environmental detection can be achieved by manually detecting whether the piston of the pipeline of the measuring terminal is opened, and the functional self-test can be achieved by measuring the pressure after the measuring terminal is turned on. If the measured absolute pressure continues to show no change, it means that the piston is not opened or other faults occur in the measuring terminal equipment.

[0112] In the embodiment of the present invention, when a small number of measurement points are set, multiple measurement terminals can be used to simultaneously measure the absolute pressure at the same point, which can improve the accuracy of the measurement.

[0113] In an embodiment of the present invention, determining whether the fluctuation of the absolute pressure at each measuring point satisfies a preset measurement reference value selection condition includes: calculating the fluctuation range of the absolute pressure at each measuring point within a preset time length; determining whether the fluctuation range is less than a preset fluctuation range threshold; when the fluctuation range is less than the preset fluctuation range threshold, determining that the fluctuation of the absolute pressure at each measuring point satisfies the preset measurement reference value selection condition; when the fluctuation range is greater than or equal to the preset fluctuation range threshold, determining that the fluctuation of the absolute pressure at each measuring point does not satisfy the preset measurement reference value selection condition.

[0114] In an embodiment of the present invention, calculating the fluctuation range of the absolute pressure at each measuring point within a preset time period includes: calculating the fluctuation range of the absolute pressure at each measuring point within a preset time period by using the following calculation model:

[0115] or

[0116]

[0117] The preset duration can be freely set according to actual application needs, and the present invention does not make any specific limitation on this.

[0118] In an embodiment of the present invention, when the fluctuation range is greater than or equal to the preset fluctuation range threshold, it is determined that the fluctuation of the absolute pressure at each measuring point does not meet the preset measurement reference value selection condition, and the operation of sampling the measurement data uploaded by each measuring terminal is waited for execution. It can be understood that when the fluctuation range of the absolute pressure is large, it means that the absolute pressure of the measuring point is unstable at this time, and calibrating the absolute pressure of each measuring point when the absolute pressure is unstable will cause a waste of computing resources; in addition, if the unstable absolute pressure data is used to calculate the pressure difference value, it will affect the measurement accuracy of the actual pressure difference value. Therefore, the system does not automatically perform the absolute pressure sampling operation and enters the waiting state. When the fluctuation range is less than the preset fluctuation range threshold, the absolute pressure of each measuring point is sampled.

[0119] In a specific embodiment, the preset time length can be set to 30S, and the preset fluctuation range threshold can be set to 5%. The absolute pressure at each measuring point is sampled, specifically including: monitoring the fluctuation of the absolute pressure at each measuring point according to the measurement data, if the fluctuation range of the absolute pressure within 30S is greater than 5%, then waiting to perform the sampling operation of the absolute pressure at each point; in actual application, the "record" button of the control terminal can also be pressed as needed to perform manual sampling and record the instantaneous absolute pressure data; if the fluctuation range of the absolute pressure within 30S is less than 5%, then the absolute pressure at each measuring point is sampled and the absolute pressure data is automatically recorded.

[0120] In actual applications, the "Calibration" button can also be pressed through human-computer interaction to calibrate the absolute pressure of each measuring point according to the measurement data and fluctuation conditions; after the absolute pressure of each measuring point is calibrated, if the first target selection terminal with a preset measurement reference value is not detected; then the second target selection terminal with a measurement reference value is selected according to the user's specified operation, and the absolute pressure of each measuring point sampled from the second target selection terminal is used as the preset measurement reference value; in this embodiment, the direction button and the "OK" button of the control terminal can be pressed to select a certain absolute pressure data as the preset measurement reference value; further, the "Calculate" button of the control terminal is pressed to enable the control terminal to calculate the actual pressure difference value of each point according to the calibrated absolute pressure and the preset measurement reference value.

[0121] The embodiment of the present invention provides a high-precision micro-pressure difference measurement method and system, which can not only measure the micro-pressure difference distribution of multiple spatial measurement points, but also eliminate the error caused by the change of ambient temperature during the micro-pressure difference measurement, thereby improving the measurement accuracy of the micro-pressure difference. In addition, the measurement system proposed in the embodiment of the present invention is cleverly designed, has low production cost, high measurement accuracy, can adapt to high-precision micro-pressure difference measurement in multiple spatial environments and reduce the difficulty of measurement technology. In particular, it can overcome the technical defects of the existing high-precision micro-pressure difference measurement system due to the high difficulty of measurement technology, the lack of equipment, and the poor pressure difference monitoring effect caused by ignoring the pressure difference monitoring in the transition area. It has a wide range of applications and is convenient and efficient to use.

[0122] In addition, those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, any one of the claimed embodiments may be used in any combination.

[0123] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-precision micro-pressure differential measurement system, It is characterized in that The system comprises a measurement terminal array and a control terminal communicatively connected to the measurement terminal array; The measuring terminal array includes measuring terminals respectively arranged at a plurality of different measuring points of a plurality of spaces to be measured, each of the measuring terminals including: an air storage module for storing reference air to form a reference pressure; a temperature measuring module for measuring the ambient temperature of the air storage and recording the measurement time, and sending the ambient temperature and the temperature measurement time as measurement data to the control terminal; a pressure measuring module for measuring the absolute pressure at the point and the reference pressure in the air storage and recording the pressure measurement time, and sending the absolute pressure, the reference pressure in the air storage and the pressure measurement time as measurement data to the control terminal; The control terminal is used to receive measurement data uploaded by each measurement terminal in the measurement terminal array, calibrate the absolute pressure of each measurement point according to the measurement data and fluctuation conditions, calculate the actual pressure difference value of each point according to the calibrated absolute pressure and a preset measurement reference value, store and display the actual pressure difference value, and improve the measurement accuracy of micro-pressure difference.

2. The system according to claim 1, It is characterized in that The measuring terminal further includes: A first transmission module, used to communicate with the control terminal to send the measurement data of the temperature measurement module and the pressure measurement module to the control terminal in the form of wireless transmission; A first digital display module, used to display the measurement data of the temperature measurement module and the pressure measurement module; A first storage module, used for storing the measurement data of the temperature measurement module and the pressure measurement module; The first power supply module is used to supply power to each component module in the measurement terminal.

3. The system according to claim 1, It is characterized in that The control terminal comprises: A second transmission module, used for communicating with the measurement terminals to receive the measurement data sent by each measurement terminal and send the measurement data to the data processor; A data processor, used to calibrate the absolute pressure of each measuring point according to the measurement data and fluctuation conditions, and calculate the actual pressure difference value of each point according to the calibrated absolute pressure and a preset measurement reference value; The second digital display module is used to display the measurement data sent by each measurement terminal and the pressure difference value of each measurement point calculated by the data processor; A second storage module is used to store the measurement data sent by each measurement terminal and the pressure difference value calculated by the data processor; The second power supply module is used to supply power to each component module in the control terminal.

4. A high-precision micro-pressure difference measurement method, the method being applicable to the high-precision micro-pressure difference measurement system as claimed in any one of claims 1 to 3, It is characterized in that The method comprises: Acquire measurement data of the measurement points where each measurement terminal in the measurement terminal array is located; the measurement data includes ambient temperature, temperature measurement time, absolute pressure, reference pressure in the gas storage bin, and pressure measurement time; Calculate the relative pressure difference between the absolute pressure at the measuring point where each measuring terminal is located and the reference pressure in the gas storage tank; Determine whether the fluctuation of the absolute pressure at each measuring point meets the preset measurement reference value selection conditions; When the fluctuation of the absolute pressure meets the selection condition of the measurement reference value, the absolute pressure of each measurement point is calibrated according to the measurement data and the relative pressure difference of each measurement point, and the actual pressure difference value of each point is calculated according to the calibrated absolute pressure and the preset measurement reference value. The actual pressure difference value is stored and displayed to improve the measurement accuracy of micro-pressure difference.

5. The method according to claim 4, It is characterized in that Calculate the relative pressure difference between the absolute pressure at the measuring point of each measuring terminal and the reference pressure in the gas storage tank, including: Calculating the relative pressure difference according to a preset first calculation model; The preset first calculation model is: relative pressure difference = the absolute pressure at each measuring point - the reference pressure in the gas storage bin.

6. The method according to claim 5, It is characterized in that The absolute pressure at each measuring point is calibrated according to the measurement data and the relative pressure difference, including: Calibrate the absolute pressure at each measuring point according to a preset second calculation model; The preset second calculation model is: Among them, P' t Represents the absolute pressure at each measuring point after calibration, P t represents the relative pressure difference calculated according to the first calculation model; T 0 Indicates the initial ambient temperature value in the gas storage bin; T i Indicates the ambient temperature value after the change in the gas storage tank; p 0 Indicates the ambient temperature is T 0 The reference pressure measured in the gas storage tank at .

7. The method according to claim 6, It is characterized in that After calibrating the absolute pressure at each measuring point according to the measurement data and the relative pressure difference, the method further includes: Sampling the absolute pressure of each calibrated measuring point in the measurement data uploaded by the measurement terminal; Detecting whether a first target selection terminal with a measurement reference value is preset; If so, the absolute pressure of each measuring point after calibration in the measurement data uploaded by the first target selection terminal is used as the preset measurement reference value; otherwise, the second target selection terminal for the measurement reference value is selected according to the user's specified operation, and the absolute pressure of each measuring point after calibration sampled from the second target selection terminal is used as the preset measurement reference value.

8. The method according to claim 7, It is characterized in that The actual pressure difference value at each point is calculated based on the calibrated absolute pressure and the preset measurement reference value, including: Calculate the actual pressure difference value at each point according to the preset third calculation model; The preset third calculation model is: actual pressure difference value = the absolute pressure of each measuring point after calibration - preset measurement reference value.

9. The method according to claim 4, It is characterized in that Before obtaining the measurement data of the measurement points where each measurement terminal in the measurement terminal array is located, the method further includes: Turning on each measuring terminal and control terminal in the measuring terminal array, and controlling the measuring terminal and control terminal to perform a functional self-check to ensure that the measuring terminal can normally perform a measuring operation and the control terminal can normally perform a control operation; After the measuring terminal and the control terminal are turned on, a wireless connection is established between the measuring terminal and the control terminal to ensure synchronous transmission of measurement data.

10. The method according to claim 4, It is characterized in that Determine whether the fluctuation of the absolute pressure at each measuring point meets the preset measurement reference value selection conditions, including: Calculate the fluctuation range of the absolute pressure at each measuring point within a preset time period; Determining whether the fluctuation range is less than a preset fluctuation range threshold; When the fluctuation range is less than a preset fluctuation range threshold, it is determined that the fluctuation of the absolute pressure at each measuring point satisfies a preset measurement reference value selection condition; When the fluctuation range is greater than or equal to a preset fluctuation range threshold, it is determined that the fluctuation of the absolute pressure at each measuring point does not satisfy a preset measurement reference value selection condition.

Images