Disclosure of Invention
The invention aims to solve the technical problem of providing an open space gas leakage testing device and method aiming at the defects of the prior art.
The technical scheme includes that the open space gas leakage testing device comprises a detecting device, a plurality of first release systems used for testing the measuring distance of the detecting device, a plurality of second release systems used for testing the monitoring pitch angle of the detecting device and a gas source system, wherein the first release systems are arranged along the axis direction of the detecting device, the second release systems are arranged perpendicular to the axis direction of the detecting device, the first release systems and the second release systems are connected with the gas source system through pipelines, a pressurizing device and a mixing device used for premixing mixed gas with different concentrations are arranged in the gas source system, a flowmeter is arranged in each of the first release systems and the second release systems, and a fan used for manufacturing different flow rates, a anemometer used for measuring real-time wind speed and wind direction, a barometer and a temperature sensor used for calibrating ambient temperature are arranged at positions adjacent to the first release systems and the second release systems.
The technical scheme has the advantages that the gas to be tested with different concentrations and components can be manufactured and conveyed to a plurality of positions to be released through the pipeline, and the positions to be released release premixed gas according to different pressures. The release devices are adjusted and distributed at equal intervals according to different distances and radians, and can be released simultaneously or in time sequence according to different positions required. Quantitative simulation of the leakage process and performance test of the leakage monitoring equipment are realized. And evaluating characteristic parameters such as minimum leakage monitoring precision, leakage sensitivity, integral concentration and the like. The release of gases with different leakage rates is realized, so that the test and evaluation of characteristic parameters are satisfied. The position of the origin releasing point and the position of the device to be tested can be adjusted, the distance can be measured by the test system by adjusting the position back and forth, and the distance can be adjusted laterally, so that the azimuth angle can be monitored by the test equipment. And adjusting the pitch angle monitored by the measuring system up and down. By horizontal and vertical positions, computational measurements of the field of view are achieved. Multiple gas source release points can be simultaneously opened so as to test the multi-point detection capability of the system. Multiple gas source release points may be set at different flow rates for release. The device can test the open space combustible gas, provides a testing device for the combustible gas detector with different detection distances and different sensitivity expression modes, and realizes quantitative evaluation of performance indexes. The gas with different quality is firstly put into a container, then premixed in the container, and the gas in the premixer is used as the gas to be tested to be released after the gas is stabilized. The low-pressure test can adopt a direct mixing mode, and the high-pressure test adopts a pre-mixing and then pressurizing mode, so that the pressure of the pressurizing device can exceed 5MPa, and the temperature drop test requirement of high-pressure discharge is met. The release point is equipped with a flow meter that can meter the released flow rate in real time. The release point can help air flow through an axial flow fan, and the fan can control the rotating speed through different programming to manufacture different flow rates. The real-time wind speed and direction are measured through the anemometer, the barometer measures the real-time atmospheric pressure, and the real-time diffusion condition is calculated in an auxiliary mode. And calculating the diffusion concentration distribution and the size of the air mass according to the diffusion models of the gases with different components. The leakage source is provided with a temperature sensor to meet the temperature drop measurement requirement and realize the calibration of the ambient temperature.
Further, a release position is arranged in the first release system, a flow orifice plate or a crack is arranged at the release position, and the first release system and the second release system have the same structure.
The technical proposal has the beneficial effects that the pressure is released outwards through different apertures (flow hole plates) or openings (cracks) according to the set pressure. Different leakage patterns were simulated by perforating and cracking one circular end face.
Further, the mixing device comprises a plurality of gas cylinders, first valves are arranged at the outlets of the gas cylinders, the first valves are connected with a premixing tank through pipelines, the premixing tank is connected with a supercharging device through pipelines, the supercharging device is connected with a release tank through pipelines, and the release tank is connected with the first release systems and the second release systems through pipelines.
The technical scheme has the beneficial effects that the mixed gas mixing with different proportions is realized in the gas source part, and the gas to be measured with different purities is artificially manufactured. One cylinder is pure gas, the other cylinder is air (nitrogen), and the mixture according to a certain proportion is realized by adopting different valve openings under the same pressure, and then the mixed gas with different proportions is formed. The circular end face is connected with the pipeline by a valve, and the leakage quantity is controlled by a gate valve. The leakage pressure and the gas concentration are uniformly proportioned at the gas source end and are conveyed to the release end through a pipeline.
Further, the mixing device is a container provided with mixed gases with different concentrations, the container is connected with the pressurizing device through a pipeline, the pressurizing device is connected with the release tank through a pipeline, and the release tank is connected with the plurality of first release systems and the plurality of second release systems through pipelines.
The technical scheme has the beneficial effects that the mixed gas mixing with different proportions is realized in the gas source part, and the gas to be measured with different purities is artificially manufactured. The gas with different quality is firstly put into a container, then premixed in the container, and the gas in the premixer is used as the gas to be tested to be released after the gas is stabilized. The leakage pressure and the gas concentration are uniformly proportioned at the gas source end and are conveyed to the release end through a pipeline.
Further, a lifting platform is arranged at the bottom of the detection equipment.
The further technical scheme has the beneficial effects that the height of the detection equipment can be conveniently adjusted according to actual needs, and the gas leakage condition at different height positions can be detected.
Further, a plurality of first release systems and a plurality of second release systems are respectively provided with a second valve, and the second valves are connected with a PID controller for controlling release time, duration and second valve openings.
The technical scheme has the advantages that the release time of different release points can be controlled in a programmable manner, and the starting time and the duration of release can be controlled. The release flow is controlled by PID regulation, and the opening size is controlled according to the actual flow.
Further, the axial flow fan is located on a measuring light path of the detection device, or the axial flow fan is perpendicular to the measuring light path of the detection device.
The axial flow fan has the beneficial effects that the axial flow fan can be perpendicular to the measuring light path on the measuring light path to manufacture different diffusion conditions.
Further, a third release system for testing the monitoring azimuth angle of the detection device is provided adjacent to the first release system and the second release system.
The technical scheme has the advantages that the positions of the origin release point and the device to be tested can be adjusted, the distance can be measured by the test system by adjusting the positions back and forth, and the azimuth angle can be monitored by the test equipment by adjusting the distance laterally. And adjusting the pitch angle monitored by the measuring system up and down. By horizontal and vertical positions, computational measurements of the field of view are achieved.
In addition, the embodiment of the invention provides an open space gas leakage testing method, which is based on the open space gas leakage testing device, and comprises the steps of S1, manufacturing gases to be tested with different concentrations and components through a gas source system, S2, releasing the gases to be tested according to preset conditions through a first release system and a second release system, S3, measuring a first leakage parameter through a detection device and measuring a second leakage parameter through a testing device, and S4, evaluating the detection device according to the second leakage parameter and the first leakage parameter.
The technical scheme has the advantages that the gas to be tested with different concentrations and components can be manufactured and conveyed to a plurality of positions to be released through the pipeline, and the positions to be released release premixed gas according to different pressures. The release devices are adjusted and distributed at equal intervals according to different distances and radians, and can be released simultaneously or in time sequence according to different positions required. Quantitative simulation of the leakage process and performance test of the leakage monitoring equipment are realized. And evaluating characteristic parameters such as minimum leakage monitoring precision, leakage sensitivity, integral concentration and the like. The release of gases with different leakage rates is realized, so that the test and evaluation of characteristic parameters are satisfied. The position of the origin releasing point and the position of the device to be tested can be adjusted, the distance can be measured by the test system by adjusting the position back and forth, and the distance can be adjusted laterally, so that the azimuth angle can be monitored by the test equipment. And adjusting the pitch angle monitored by the measuring system up and down. By horizontal and vertical positions, computational measurements of the field of view are achieved. Multiple gas source release points can be simultaneously opened so as to test the multi-point detection capability of the system. Multiple gas source release points may be set at different flow rates for release. The device can test the open space combustible gas, provides a testing device for the combustible gas detector with different detection distances and different sensitivity expression modes, and realizes quantitative evaluation of performance indexes.
Further, the preset conditions comprise pressure, release position, release time, release starting time, release duration time, release flow, aperture, rotating speed of the axial flow fan and view field, the step S2 comprises the steps of testing the minimum leakage amount by reducing leakage flow, aperture and crack width, testing measuring accuracy at different wind speeds by adjusting the rotating speed of the axial flow fan, and determining response time of the detection device by the leakage time of different release points and the difference value of valve opening time and leakage time.
The leakage rate test adopts different flow rates and different leakage apertures to simulate different leakage diffusion modes, and the leakage simulation result and the actual measurement result are compared to measure the diffusion rule.
Additional aspects of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the illustrated embodiments are provided for illustration only and are not intended to limit the scope of the present invention.
As shown in fig. 1 to 6, the embodiment of the invention provides an open space gas leakage testing device, which comprises a detection device 1, a plurality of first release systems 2 for testing the measurement distance of the detection device 1, a plurality of second release systems 3 for monitoring the pitch angle of the detection device 1 and a gas source system 4, wherein the plurality of first release systems 2 are arranged along the axial direction of the detection device 1, the plurality of second release systems 3 are arranged vertically to the axial direction of the detection device 1, the plurality of first release systems 2 and the plurality of second release systems 3 are connected with the gas source system 4 through pipelines, a pressurizing device 8 and a mixing device for premixing and generating mixed gases with different concentrations are arranged in the gas source system 4, a flowmeter is arranged in each of the plurality of first release systems 2 and the plurality of second release systems 3, a fan 9 for manufacturing different flow rates, a anemometer 10 for measuring the real-time axial flow speed and the wind direction, and a temperature sensor 11 for calibrating the temperature of the environment are arranged adjacent to the first release systems 2 and the second release systems 3.
The technical scheme has the advantages that the gas to be tested with different concentrations and components can be manufactured and conveyed to a plurality of positions to be released through the pipeline, and the positions to be released release premixed gas according to different pressures. The release devices are adjusted and distributed at equal intervals according to different distances and radians, and can be released simultaneously or in time sequence according to different positions required. Quantitative simulation of the leakage process and performance test of the leakage monitoring equipment are realized. And evaluating characteristic parameters such as minimum leakage monitoring precision, leakage sensitivity, integral concentration and the like. The release of gases with different leakage rates is realized, so that the test and evaluation of characteristic parameters are satisfied. The position of the origin releasing point and the position of the device to be tested can be adjusted, the distance can be measured by the test system by adjusting the position back and forth, and the distance can be adjusted laterally, so that the azimuth angle can be monitored by the test equipment. And adjusting the pitch angle monitored by the measuring system up and down. By horizontal and vertical positions, computational measurements of the field of view are achieved. Multiple gas source release points can be simultaneously opened so as to test the multi-point detection capability of the system. Multiple gas source release points may be set at different flow rates for release. The device can test the open space combustible gas, provides a testing device for the combustible gas detector with different detection distances and different sensitivity expression modes, and realizes quantitative evaluation of performance indexes. The gas with different quality is firstly put into a container, then premixed in the container, and the gas in the premixer is used as the gas to be tested to be released after the gas is stabilized. The low-pressure test can adopt a direct mixing mode, and the high-pressure test adopts a pre-mixing and then pressurizing mode, so that the pressure of the pressurizing device can exceed 5MPa, and the temperature drop test requirement of high-pressure discharge is met. The release point is equipped with a flow meter that can meter the released flow rate in real time. The release point can help air flow through an axial flow fan, and the fan can control the rotating speed through different programming to manufacture different flow rates. The real-time wind speed and direction are measured through the anemometer, the barometer measures the real-time atmospheric pressure, and the real-time diffusion condition is calculated in an auxiliary mode. And calculating the diffusion concentration distribution and the size of the air mass according to the diffusion models of the gases with different components. The leakage source is provided with a temperature sensor to meet the temperature drop measurement requirement and realize the calibration of the ambient temperature.
Wherein the pressurizing means 8 may be a compressor. The temperature sensor 11 may be a thermometer. The arrows in fig. 5 represent the wind direction.
For the technical requirements of the open space flammable gas detector (detection device 1), it is necessary to evaluate the characteristic parameters such as minimum leakage monitoring accuracy, leakage sensitivity, integral concentration, etc. These parameters require new testing methods and testing devices (open space gas leakage testing devices and methods) to realize release of gases with different leakage rates, quantitative simulation of leakage process and performance test of leakage monitoring equipment, thereby satisfying testing and evaluation of characteristic parameters.
As shown in fig. 1 to 6, further, a release position is provided in the first release system 2, where a flow orifice plate or crack 6 is provided, and the first release system 2 has the same structure as the second release system 3.
The technical proposal has the beneficial effects that the pressure is released outwards through different apertures (flow hole plates) or openings (cracks) according to the set pressure. Different leakage patterns were simulated by perforating and cracking one circular end face.
Wherein the flow orifice plate is provided with at least one pinhole 5.
As shown in fig. 1 to 6, further, the mixing device includes a plurality of gas cylinders, the outlets of the gas cylinders are respectively provided with a first valve, the first valves are connected with a premixing tank 16 through a pipeline, the premixing tank 16 is connected with a supercharging device 8 through a pipeline, the supercharging device 8 is connected with a release tank 17 through a pipeline, and the release tank 17 is connected with the first release systems 2 and the second release systems 3 through pipelines.
The technical scheme has the beneficial effects that the mixed gas mixing with different proportions is realized in the gas source part, and the gas to be measured with different purities is artificially manufactured. One cylinder is pure gas, the other cylinder is air (nitrogen), and the mixture according to a certain proportion is realized by adopting different valve openings under the same pressure, and then the mixed gas with different proportions is formed. The circular end face is connected with the pipeline by a valve, and the leakage quantity is controlled by a gate valve. The leakage pressure and the gas concentration are uniformly proportioned at the gas source end and are conveyed to the release end through a pipeline.
The mixing device in the air source system 4 may be provided with two air cylinders, where the two air cylinders respectively store the air 14 to be tested and the background air 15, the two air cylinders are connected with the premixing tank 16 through a pipeline, the premixing tank 16 is connected with the supercharging device 8 (may be a compressor) through a pipeline, the supercharging device 8 is connected with the releasing tank 17 through a pipeline, and the releasing tank 17 is connected with a pipeline connected with an air circuit.
As shown in fig. 1 to 6, further, the mixing device is a container provided with mixed gases with different concentrations, the container is connected with a pressurizing device 8 through a pipeline, the pressurizing device 8 is connected with a release tank 17 through a pipeline, and the release tank 17 is connected with a plurality of the first release systems 2 and a plurality of the second release systems 3 through pipelines.
The technical scheme has the beneficial effects that the mixed gas mixing with different proportions is realized in the gas source part, and the gas to be measured with different purities is artificially manufactured. The gas with different quality is firstly put into a container, then premixed in the container, and the gas in the premixer is used as the gas to be tested to be released after the gas is stabilized. The leakage pressure and the gas concentration are uniformly proportioned at the gas source end and are conveyed to the release end through a pipeline.
As shown in fig. 1 to 6, further, the bottom of the detecting device 1 is provided with a lifting platform 7.
The further technical scheme has the beneficial effects that the height of the detection equipment can be conveniently adjusted according to actual needs, and the gas leakage condition at different height positions can be detected.
The lifting platform 7 comprises a test platform 71, a lifting mechanism 72 and a base 73, wherein the base 73 is arranged on the ground 74, the lifting mechanism 72 is arranged on the base 73, and the test platform 71 is arranged on the lifting mechanism 72. The double-headed arrow in fig. 6 is the lifting direction of the lifting mechanism.
As shown in fig. 1 to 6, further, a second valve 13 is disposed in each of the plurality of first release systems 2 and the plurality of second release systems 3, and a PID controller for controlling release time, duration and opening of the second valve 13 is connected to the second valve 13.
The technical scheme has the advantages that the release time of different release points can be controlled in a programmable manner, and the starting time and the duration of release can be controlled. The release flow is controlled by PID regulation, and the opening size is controlled according to the actual flow.
Wherein, a plurality of first release systems 2 and a plurality of second release systems 3 are respectively provided with a pipe body for connecting with an air source pipeline.
As shown in fig. 1 to 6, further, the axial flow fan 9 is located on the measuring light path of the detecting device 1, or the axial flow fan 9 is perpendicular to the measuring light path of the detecting device 1.
The axial flow fan has the beneficial effects that the axial flow fan can be perpendicular to the measuring light path on the measuring light path to manufacture different diffusion conditions.
As shown in fig. 1 to 6, further, a third release system 12 for testing the monitoring azimuth angle of the detection device 1 is provided adjacent to the first release system 2 and the second release system 3.
The technical scheme has the advantages that the positions of the origin release point and the device to be tested can be adjusted, the distance can be measured by the test system by adjusting the positions back and forth, and the azimuth angle can be monitored by the test equipment by adjusting the distance laterally. And adjusting the pitch angle monitored by the measuring system up and down. By horizontal and vertical positions, computational measurements of the field of view are achieved.
The invention provides a leakage rate testing method and device (open space gas leakage testing device and method), which can manufacture gases to be tested with different concentrations and components. And the gas to be tested can be conveyed to a plurality of positions to be released (positions of the first release system, the second release system and the third release system) through pipelines, and the positions adopt openings with different shapes such as flow hole plates, cracks and the like, so that the premixed gas is released outwards according to different pressures. The release devices (the first release system, the second release system and the third release system) are regulated and distributed at equal intervals according to different distances and radians, and can be released simultaneously or in time sequence according to different positions.
The mixing of mixed gases with different proportions is realized in the gas source part (a mixing device in a gas source system), and gases with different purities to be measured are artificially manufactured. For example, one method is to use two cylinders, one of which is pure gas and the other is air (nitrogen), and mix them according to a certain ratio by using different valve openings under the same pressure, and then form mixed gas with different ratios. Another method is to put different quality gases into a container, then premix them in the container, and release the gases in the premixer as the gas to be measured after the gas is stabilized. The low-pressure test can adopt a direct mixing mode, and the high-pressure test adopts a pre-mixing and then pressurizing mode, so that the pressure of the pressurizing device can exceed 5MPa, and the temperature drop test requirement of high-pressure discharge is met.
According to the set pressure, the release time of different release points can be controlled by programming through external release of different apertures (flow hole plates) or openings (cracks), and the starting time and duration of release can be controlled. The release flow is controlled by PID (PID controller) adjustment, and the opening size is controlled according to the actual flow.
The release point is provided with a flowmeter, so that the released flow rate can be measured in real time, and the flow rate measurement can reach the ml/s-l/s range. The leakage mass is calculated by the formula of m=ρv, and the volume of the gas is converted to a mass leakage rate, for example, methane density of 0.7g/l, so that 1ml methane has a mass of 0.0007g at normal temperature and pressure, and a flow rate of 1ml/s can be converted to 0.0007g/s.
The release point can help air flow through an explosion-proof axial flow fan (axial flow fan), and the fan (axial flow fan) can control the rotating speed through different programming to manufacture different flow rates. The axial flow fan can be perpendicular to the measuring light path and can be used for manufacturing different diffusion conditions on the measuring light path. Wherein the detection device has a measuring light path.
The real-time wind speed and direction are measured through the anemometer, the barometer measures the real-time atmospheric pressure, and the real-time diffusion condition is calculated in an auxiliary mode. And calculating the diffusion concentration distribution and the size of the air mass according to the diffusion models of the gases with different components.
The invention can adjust the positions of the origin release points (a first release system, a second release system and a third release system) and the device to be tested (the detection equipment), and can adjust the measurement distance back and forth so that the test system (the detection equipment) can measure, and adjust the distance laterally so that the test equipment (the detection equipment) monitors the azimuth angle. The pitch angle monitored by the measuring system (detecting device) is adjusted up and down. By horizontal and vertical positions, computational measurements of the field of view are achieved.
The invention can simultaneously open a plurality of air source release points (a first release system, a second release system and a third release system), thereby testing the multi-point detection capability of the system (detection equipment). Multiple gas source release points may be set at different flow rates for release.
The leakage rate test adopts different flow rates and different leakage apertures to simulate different leakage diffusion modes, and compares the leakage simulation result with the actual measurement result to measure the diffusion rule.
The minimum leakage is tested by reducing leakage flow, aperture and crack width.
And measuring accuracy under different wind speeds is tested by adjusting the rotating speed of the axial flow fan.
The response time of the device (detection device) is determined by the difference in the valve opening time and the leak time from the leak time at the different points.
The system (open space gas leak test apparatus) simulates different leak patterns by perforating and cracking one circular end face. The circular end face is connected with the pipeline through a valve, leakage quantity is controlled through a gate valve, leakage pressure and gas concentration are uniformly proportioned at a gas source end (a mixing device in a gas source system), and the gas is conveyed to a release end (a first release system, a second release system and a third release system) through the pipeline.
The leakage source (the positions of the first release system, the second release system and the third release system) should be provided with temperature sensors, and the measuring range of the sensors (temperature sensors) should cover-50 ℃ to 70 ℃ so as to meet the temperature drop measurement requirement. According to the invention, 3 groups of temperature sensors are arranged at equal intervals of 500mm, so that the calibration of the ambient temperature is realized.
The method can test the open space combustible gas, provides a testing method for the combustible gas detector (detection equipment) with different detection distances and different sensitivity expression modes, and realizes quantitative evaluation of performance indexes.
The device to be detected (detection device) is placed at the far end, and the direction of the central line is consistent with the directions of the detectors (open space gas leakage test devices) No. 4, no. 5 and No.6 to be the axial direction, so that the centering of the system is realized. The front-to-back positions of detectors 4,5,6 are adjusted to test the furthest distance that the system can measure. 2. And the detectors 5 and 3 are perpendicular to the axial direction and are used for testing the included angle of the field of view of the system. The detectors 1-6 are positioned at the release sections at different positions, the detectors 4,5 and 6 are positioned in the axial direction, and the detectors 2,3 and 5 are positioned in the vertical direction. The detector 1 is located at the limit position.
The lifting platform of the detection device can realize the lifting of 0.5m-20m, and the lifting mode can adopt the mode of pulling on the vertical upright post through a steel wire rope or the lifting mode of a lifter.
The gas source adopts a mode of premixing background gas (nitrogen) and gas to be tested (methane) in a gas cylinder to manufacture the gas to be tested with different concentrations. The premixed gas is pressurized to a specified release pressure by adopting a compressor for release, the pressure of the compressor can reach 5MPa, and the flow rate can reach 1000L/h.
The vent hole can realize the vent of crack and pinhole 2 modes, and the vent flow is from 1ml/s to 10l/s.
In addition, as shown in fig. 7, the embodiment of the invention provides an open space gas leakage testing method, which is based on the open space gas leakage testing device, and comprises the steps of S1, manufacturing gases to be tested with different concentrations and components through a gas source system, S2, releasing the gases to be tested according to preset conditions through a first release system and a second release system, S3, measuring a first leakage parameter through a detection device and a second leakage parameter through a testing device, and S4, evaluating the detection device according to the second leakage parameter and the first leakage parameter.
The technical scheme has the advantages that the gas to be tested with different concentrations and components can be manufactured and conveyed to a plurality of positions to be released through the pipeline, and the positions to be released release premixed gas according to different pressures. The release devices are adjusted and distributed at equal intervals according to different distances and radians, and can be released simultaneously or in time sequence according to different positions required. Quantitative simulation of the leakage process and performance test of the leakage monitoring equipment are realized. And evaluating characteristic parameters such as minimum leakage monitoring precision, leakage sensitivity, integral concentration and the like. The release of gases with different leakage rates is realized, so that the test and evaluation of characteristic parameters are satisfied. The position of the origin releasing point and the position of the device to be tested can be adjusted, the distance can be measured by the test system by adjusting the position back and forth, and the distance can be adjusted laterally, so that the azimuth angle can be monitored by the test equipment. And adjusting the pitch angle monitored by the measuring system up and down. By horizontal and vertical positions, computational measurements of the field of view are achieved. Multiple gas source release points can be simultaneously opened so as to test the multi-point detection capability of the system. Multiple gas source release points may be set at different flow rates for release. The device can test the open space combustible gas, provides a testing device for the combustible gas detector with different detection distances and different sensitivity expression modes, and realizes quantitative evaluation of performance indexes.
In step S1, the gas to be measured with different concentrations and components is produced by a mixing device in the gas source system (the gas mixture with various concentrations is produced by premixing).
Further, the preset conditions comprise pressure, release position, release time, release starting time, release duration time, release flow, aperture, rotating speed of the axial flow fan and view field, the step S2 comprises the steps of testing the minimum leakage amount by reducing leakage flow, aperture and crack width, testing measuring accuracy at different wind speeds by adjusting the rotating speed of the axial flow fan, and determining response time of the detection device by the leakage time of different release points and the difference value of valve opening time and leakage time.
The leakage rate test adopts different flow rates and different leakage apertures to simulate different leakage diffusion modes, and the leakage simulation result and the actual measurement result are compared to measure the diffusion rule.
It should be noted that the above embodiments are merely for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the technical solution described in the above embodiments may be modified or some or all of the technical features may be equivalently replaced, and these modifications or substitutions do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present invention.