Rapid Detection Method, Device, Equipment and Storage Medium for Powder Material Density

Abstract

The present application relates to a method, device, equipment and storage medium for rapid detection of the density of powder materials, which is applied in the field of powder material density detection. The method includes: controlling a detection device to perform compression treatment on a powder material to be measured; when a preset stop condition is reached, controlling the detection device to stop the compression treatment on the powder material to be measured; determining the material volume value of the powder material to be measured; determining the material mass value of the powder material to be measured; inputting the actual volume value and the actual mass value into a preset calculation formula to obtain the true density value corresponding to the powder material to be measured. The technical effect of the present application is: accurately measuring the true density value of the powder material.

Description

Technical Field

[0001] The present application relates to the technical field of density detection of powder materials, and in particular, to a method, device, equipment and storage medium for rapid density detection of powder materials. Background Art

[0002] The density of powder materials can be divided into true density and particle density according to different definitions. The true density refers to the ratio of the weight of the powder to its true volume. The true volume of the powder material refers to the volume of the powder material remaining after excluding the enclosed space volume existing inside the powder particles.

[0003] Generally speaking, in the field of construction engineering, building materials such as concrete are often used. Concrete is mixed from various gel materials and admixtures according to a certain formula ratio. Among them, most of the gel materials and admixtures are powder materials. Therefore, the accurate determination of the true density of the gel materials and admixtures in concrete has a positive impact on the quality of concrete.

[0004] However, on the premise that the internal closed pores of the powder material itself cannot be completely excluded, it is very difficult to measure the true density of the powder material. Summary of the Invention

[0005] In order to accurately measure the true density value of powder materials, the present application provides a method, device, equipment and storage medium for rapid density detection of powder materials.

[0006] In a first aspect, the present application provides a method for rapid density detection of powder materials, adopting the following technical solution: controlling a detection device to perform compression treatment on a powder material to be measured;

[0007] When a preset stop condition is reached, controlling the detection device to stop the compression treatment on the powder material to be measured;

[0008] Determining the material volume value of the powder material to be measured;

[0009] Determining the material mass value of the powder material to be measured;

[0010] Inputting the actual volume value and the actual mass value into a preset calculation formula to obtain the true density value corresponding to the powder material to be measured.

[0011] Through the above technical solution, the powder material density detection system controls the detection device to compress the powder material to be measured located in a container, minimizes the gap between the particles of the powder material to be measured, so that the error between the measured volume value of the powder material to be measured and the actual volume is small, and thus helps to improve the test accuracy of the true density of the powder material to be measured.

[0012] In a specific feasible implementation, the detection device at least includes: a gravity piston device, a hydraulic pump device, and a resistance monitoring device.

[0013] Through the above technical solution, the gravity piston device, the hydraulic pump device, and the resistance detection device in the control device help the powder material density detection system to detect the density of the powder to be measured as accurately as possible.

[0014] In a specific feasible implementation, the control and detection device compresses the powder material to be measured, specifically including:

[0015] Obtain a start instruction;

[0016] Measure the actual mass value corresponding to the container;

[0017] If the actual mass value is higher than the preset standard container mass, control the gravity piston device to compress the powder material to be measured located in the container under the condition of one standard atmosphere;

[0018] Read the bulk volume value of the powder material in the container device;

[0019] Start the hydraulic pump device and control the hydraulic pump device to press the ionic liquid into the container.

[0020] Through the above technical solution, when the gaps between the particles of the powder material to be measured are as small as possible, the powder material density detection system presses the ionic liquid into the powder material to be measured, so that the ionic liquid can fill the gaps between the particles of the powder material to be measured, providing data support for the subsequent calculation of the true density of the powder material to be measured.

[0021] In a specific feasible implementation, when the stop condition is reached, control the detection device to stop compressing the powder material to be measured, specifically including:

[0022] When the gravity piston device compresses the powder device to be measured in the container, control the resistance monitoring device to monitor the resistance corresponding to the container in real time to obtain a number of resistance values;

[0023] Calculate the change difference of the resistance corresponding to the container by using the resistance values;

[0024] When the change difference is 0, control the hydraulic pump device to stop pumping the ionic liquid into the container.

[0025] Through the above technical solution, the powder material density detection system uses ionic liquid and determines whether the ionic liquid has filled the gaps between the powder materials to be measured through the change of the resistivity value, making the determination result more accurate.

[0026] In a specific feasible implementation, the method further includes:

[0027] Controlling the detection device to perform compression processing on the powder material to be tested with several different material mass values;

[0028] Detecting the density of the powder to be tested to obtain a true density set, where the true density set includes several true density values;

[0029] Calculating the average value of several true density values in the true density set, and recording the average value as the measurement result of the true density value of the powder material to be tested.

[0030] Through the above technical solution, the powder material density detection system measures the corresponding true density values of different mass powder materials to be tested multiple times, and takes the average value as the test result of the final true density value, which helps to reduce the error of the measurement result and further improve the accuracy of the final result of the true density value.

[0031] In a specific feasible implementation, after detecting the density of the powder to be tested to obtain a true density set, it further includes:

[0032] Obtaining several true density values in the true density set;

[0033] Judging whether the true density value is within the standard range;

[0034] If not, removing the true density value from the true density set.

[0035] Through the above technical solution, when the powder material density detection system calculates the average value corresponding to several true density values, it will clean the invalid data in the several true density values, thereby helping to improve the accuracy of the final result of the true density value and reducing the influence of invalid data on the final result.

[0036] In a specific feasible implementation, the density difference between the ionic liquid and the powder material to be tested is less than a preset density difference threshold, and the density value of the ionic liquid is higher than the standard density value of the powder material to be tested.

[0037] Through the above technical solution, the powder material density detection system selects a suitable ionic liquid according to the density value of the powder material to be tested, which helps to further improve the accuracy of the final result of the true density value.

[0038] In a second aspect, the present application provides a powder material density rapid detection device, adopting the following technical solution: The device includes:

[0039] A detection device control module for controlling the detection device to perform compression processing on the powder material to be tested;

[0040] The powder material compression module is used to control the detection device to stop the compression process of the powder material to be measured when a preset stop condition is reached;

[0041] The material volume determination module is used to determine the material volume value of the powder material to be measured;

[0042] The material mass determination module is used to determine the material mass value of the powder material to be measured;

[0043] The true density value calculation module is used to input the actual volume value and the actual mass value into a preset calculation formula to obtain the true density value corresponding to the powder material to be measured.

[0044] In a third aspect, the present application provides a computer device, adopting the following technical solution: including a memory and a processor, and a computer program capable of being loaded and executed by the processor, such as any one of the above powder material density rapid detection methods, is stored on the memory.

[0045] In a fourth aspect, the present application provides a computer-readable storage medium, adopting the following technical solution: storing a computer program capable of being loaded and executed by the processor for any one of the above powder material density rapid detection methods.

[0046] In summary, the present application includes at least one of the following beneficial technical effects:

[0047] 1. The powder material density detection system controls the detection device to compress the powder material to be measured located in the container, minimizing the gap between the particles of the powder material to be measured, so that the error between the measured volume value of the powder material to be measured and the actual volume is small, thereby helping to improve the test accuracy of the true density of the powder material to be measured;

[0048] 2. When the gap between the particles of the powder material to be measured is as small as possible, the powder material density detection system presses the ionic liquid into the powder material to be measured, so that the ionic liquid can fill the gap between the particles of the powder material to be measured, providing data support for the subsequent calculation of the true density of the powder material to be measured. Description of the Drawings

[0049] Figure 1 It is a schematic diagram of the overall structure of the control device in an embodiment of the present application.

[0050] Figure 2 It is a flowchart of the powder material density rapid detection method in an embodiment of the present application.

[0051] Figure 3 It is a structural block diagram of the powder material density rapid detection device in an embodiment of the present application.

[0052] Reference numerals: 301, detection device control module; 302, powder material compression module; 303, material volume determination module; 304, material mass determination module; 305, true density value calculation module. Detailed implementation manners

[0053] The following further elaborates on this application in conjunction with the attached Figures 1-3 drawings.

[0054] As Figure 1 shown, an embodiment of this application discloses a method for rapidly detecting the density of powder materials. This method is applied to a powder material density detection system, and the corresponding program code of the method is stored in the control center of the powder material density detection system. The powder material density detection system includes a control center and a detection device. The detection device includes a gravity piston device for compressing the powder material to be measured in a container; a resistance detection device for detecting the resistance value of the container when it is energized; a pressure gauge for controlling the air pressure conditions during the density test process; and a hydraulic pump device for storing ionic liquid and pumping the ionic liquid into the container.

[0055] As Figure 2 shown, this method includes the following steps:

[0056] S10, controlling the detection device to perform compression processing on the powder material to be measured.

[0057] Specifically, the detection device is mainly a mechanical structure for performing physical operations on the powder material to be measured. In this embodiment, the detection device mainly includes three parts: a gravity piston device, a hydraulic pump device, and a resistance monitoring device. Before measuring the true density of the powder material to be measured, the staff will load an appropriate amount of the powder material to be measured into the container and place the container already filled with the powder material to be measured directly below the gravity piston device. Among them, the piston head of the gravity piston device can penetrate into the interior of the container to compress the powder device to be measured located inside the container. In order to achieve an ideal compression effect, the size of the piston head in the gravity piston device should match the opening of the container as much as possible to avoid as much as possible that part of the powder material to be measured overflows from the gap between the piston head and the inner wall of the container during the compression of the powder material to be measured by the gravity piston device.

[0058] After the container is placed in position, the operator can click the start button on the interface of the powder material density detection system. The powder material density detection system controls the gravity piston device to start running. After receiving the start command, the gravity piston device will continuously drive the piston head to move back and forth under the condition of one atmospheric pressure, and continuously compress the powder material to be measured in the container until the corresponding volume value of the powder material to be measured in the container no longer changes. It should be noted that considering that the operator may be negligent and place an empty container without the powder material to be measured under the gravity piston device, a mass detector is installed below the gravity piston device to measure the overall mass of the container, and the container is located between the gravity piston device and the mass detector. Before the gravity piston device starts, the powder material density detection system will control the mass detector to measure the mass of the container. When the obtained actual mass value exceeds the preset marked container mass, it can be explained that there is powder material to be measured in the container at this time. Measuring the actual mass value of the container can effectively avoid the situation where the gravity piston device compresses an empty container.

[0059] Next, under the condition of one atmospheric pressure, the powder material density detection system will control the hydraulic pump device to inject ionic liquid into the container. Ionic liquid refers to a liquid composed entirely of ions. If water or other substances are used in this embodiment, it is very likely that the water will react with the powder material to be measured, making the measurement process unable to continue; if inorganic liquid is used, the powder material density detection system cannot use the change process of the container resistance value to indicate whether the inorganic liquid has filled the gap between the powder materials to be measured; by using ionic liquid, the powder material density detection system can achieve the dual effects through resistivity measurement. And ionic liquid is non-toxic, harmless, non-flammable and non-explosive. After the test, it can be centrally recycled and used without environmental hazards. It should be noted that injecting ionic liquid into the container here means using ionic liquid to fill the gaps between the powder material particles to be measured. Since the powder material particles to be measured are not regular geometric shapes, there are gaps between the particles, which will cause errors in the actual volume measurement of the powder material to be measured. Using ionic liquid can effectively make up for this error.

[0060] S20. When the preset stop condition is reached, control the detection device to stop compressing the powder material to be measured.

[0061] Specifically, in order to ensure that the ionic liquid pressed into the container can fully fill the gaps between the powder materials to be measured, the staff installs a resistance monitoring device outside the container, and wires are connected to the top and bottom of the outside of the container. The resistance monitoring device is connected to the container through the wires. The particle liquid is conductive. During the process of the powder material density detection system controlling the hydraulic pump to press the ionic liquid into the container, the powder material density detection system will energize the circuit where the container is located. In order to ensure the smoothness of the circuit, in this embodiment, the manufacturing material of the container is a conductive material.

[0062] When the gravity piston device starts to operate, the powder material density detection system controls the resistance monitoring device to monitor the current corresponding resistance value of the container in real time, and calculates the change difference of the resistance value in the adjacent two resistance detection results. When the calculated change difference is continuously 0 for multiple times, that is, when the resistance value corresponding to the container no longer changes, it can be explained that the ionic liquid in the container has tended to be saturated at this time. That is to say, the ionic liquid pressed into the container has fully filled the gaps between the powder materials to be measured. At this time, the powder material density detection system will control the hydraulic pump device to stop operating and no longer press the ionic liquid into the container. In this embodiment, the number of times to judge whether to stop the operation of the hydraulic pump device is 5 times, that is, when the calculated change difference is continuously 0 for 5 times, the powder material density detection system controls the hydraulic pump device to stop operating.

[0063] At the beginning, before the piston head contacts the powder material to be measured, the air medium is in the cavity of the container and the resistance value is infinite. As the piston head gradually descends until it contacts the powder material to be measured, the resistance value begins to continuously decrease. When the ionic liquid is pumped into the gaps between the powder material particles, as the ionic liquid gradually fills the pores between the particles, the resistance value will continue to decrease until the resistance value reaches a constant value. At this time, it indicates that the gaps between the powder material particles are completely filled with the ionic liquid.

[0064] It is worth mentioning that the density difference between the ionic liquid and the powder material to be measured in this embodiment is less than the density difference threshold of the threshold value, and the density value of the ionic liquid is higher than the standard density value of the powder material to be measured. The density values of the powder material to be measured and the ionic liquid being close to each other further ensure the accuracy of the measurement.

[0065] S30. Determine the material volume value of the powder material to be measured.

[0066] Specifically, when the powder material density detection system controls the gravity piston device to tightly press the powder material to be measured in the container so that it is in a tightly packed state, at this time, the hydraulic pump device has not yet pumped the ionic liquid into the container. There are corresponding scale values engraved on the outer wall of the container. The powder material density detection system uses this scale value to obtain the volume value of the powder material to be measured at this time. For the convenience of later description, the volume value read according to the scale value is set as V1 here. The way for the powder material density detection system to obtain the volume of the powder material to be measured can be that the staff manually reads the value and then inputs it into the powder material density detection system; it can also be that the powder material density detection system takes a picture of the container using an image device, obtains the image information of the container, and processes the image information using image processing and recognition technologies to read the scale value reached by the upper cross-section of the powder material to be measured. Since there are gaps between the powder materials to be measured, the volume value read through the scale value includes the volume corresponding to the gaps between the powder material particles and is not exactly the actual volume value corresponding to the powder material to be measured. Also, because the gaps between the powder materials to be measured are filled with ionic liquid, the actual volume value of the powder material to be measured is the volume value read using the scale value minus the volume value of the ionic liquid.

[0067] In this embodiment, the mass of the ionic liquid pumped into the container is known. It can be that the staff inputs the specific mass value corresponding to the ionic liquid pumped into the container into the powder material density detection system through an external device such as a keyboard, or it can be that the powder material density detection system measures it using a mass measuring instrument. Since the density of the ionic liquid is known and has been pre-stored in the powder material density detection system, the powder material density detection system uses the variant form of the density formula to obtain the volume of the ionic liquid. The variant form is:

[0068] V2 = M2 / ρ;

[0069] V2 is the volume value of the ionic liquid, M2 is the mass value of the ionic liquid, and ρ is the density value of the ionic liquid.

[0070] The actual volume value corresponding to the powder material to be measured in the container is V1 - V2, and the actual volume value is the material volume value in the above text.

[0071] S40. Determine the material mass value of the powder material to be measured;

[0072] Specifically, before the powder material density detection system controls the gravity piston device to compress the powder film material to be measured in the container, it measures the overall mass of the container. The gap between the powder materials to be measured is air, and the air quality can be ignored. Therefore, at this time, the overall mass of the container is the sum of the mass of the container itself and the mass of the powder material to be measured in the container. The mass of the container itself is the mass of the standard container, which is known. By subtracting the mass of the standard container from the measured overall mass of the container, the material mass value corresponding to the powder material to be measured can be obtained, which is M1.

[0073] S50, input the actual volume value and the actual mass value into a preset calculation formula to obtain the true density value corresponding to the powder material to be measured.

[0074] Specifically, the preset calculation formula is:

[0075] ρ 粉 =M1 / (V1 - V2);

[0076] Among them, ρ 粉 is the true density value of the powder material to be measured; M1 is the material mass value corresponding to the powder material to be measured; V1 is the volume value of the powder material to be measured and the ionic liquid in the container; V2 is the volume value of the ionic liquid.

[0077] In order to improve the accuracy of the true density value corresponding to the powder material to be measured, the staff will prepare multiple portions of the powder material to be measured at the same time, and the mass values of each portion of the powder material to be measured are different. The powder material density detection system controls the detection device to compress several portions of the powder material to be measured and measures their corresponding true density values. Considering that sometimes the detection device may malfunction, resulting in incorrect data of the material mass value and the material volume value corresponding to the powder material to be measured, and further causing the calculated true density value to be inconsistent with the actual situation. Therefore, whenever the powder material density detection system calculates a true density value, it will store it in the true density set. After all the true density values of the powder material to be measured are detected, the powder material density detection system sequentially obtains the true density values from the true density set and compares them with the endpoint values of the preset standard range to determine whether the true density value is within the standard range. The standard range mentioned here refers to the rough range corresponding to the true density of the powder material to be measured. If there is a true density value in the true density set that is outside the standard range, then this value is very likely to be invalid data, and the powder material density detection system will remove this true density value from the true density set and take the average value of the remaining true density values in the true density set as the measurement result of the density test of the powder material to be measured this time, improving the accuracy of the true density value corresponding to the powder material to be measured.

[0078] Figure 2 It is a flow diagram of a method for rapid detection of powder material density in an embodiment. It should be understood that althoughFigure 2 The steps in the flowchart are shown in sequence according to the indication of the arrows. However, these steps are not necessarily executed in the order indicated by the arrows; unless otherwise clearly stated in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders; and Figure 2 at least a part of the steps in

[0079] Based on the above method, an embodiment of the present application also discloses a device for quickly detecting the density of powder materials.

[0080] As Figure 3 shown, the device includes the following modules:

[0081] A detection device control module 301, configured to control the detection device to perform compression processing on the powder material to be measured;

[0082] A powder material compression module 302, configured to control the detection device to stop the compression processing of the powder material to be measured when a preset stop condition is reached;

[0083] A material volume determination module 303, configured to determine the material volume value of the powder material to be measured;

[0084] A material mass determination module 304, configured to determine the material mass value of the powder material to be measured;

[0085] A true density value calculation module 305, configured to input the actual volume value and the actual mass value into a preset calculation formula to obtain the true density value corresponding to the powder material to be measured.

[0086] In one embodiment, the detection device control module 301 is further configured to the detection device at least includes: a gravity piston device, a hydraulic pump device, and a resistance monitoring device.

[0087] In one embodiment, the detection device control module 301 is further configured to obtain a start instruction;

[0088] The actual mass value corresponding to the measuring container;

[0089] If the actual mass value is higher than the preset standard container mass, then control the gravity piston device to compress the powder material to be measured located in the container under the condition of one standard atmosphere;

[0090] Read the bulk volume value of the powder material in the container device;

[0091] Start the hydraulic pump device and control the hydraulic pump device to press the ionic liquid into the container.

[0092] In one embodiment, the powder material compression module 302 is further configured to, when the gravity piston device compresses the powder device to be measured in the container, control the resistance monitoring device to monitor the resistance corresponding to the container in real time to obtain a plurality of resistance values;

[0093] Calculate the change difference of the resistance corresponding to the container by using the resistance values;

[0094] When the change difference is 0, control the hydraulic pump device to stop pumping the ionic liquid into the container.

[0095] In one embodiment, the powder material compression module 302 is further configured to control the detection device to perform compression processing on the powder materials to be measured with a plurality of different material mass values;

[0096] Detect the density of the powder to be measured to obtain a true density set, and the true density set includes a plurality of true density values;

[0097] Calculate the average value of the plurality of true density values in the true density set, and record the average value as the measurement result of the true density value of the powder material to be measured.

[0098] In one embodiment, the true density value calculation module 305 is further configured to obtain a plurality of true density values in the true density set;

[0099] Determine whether the true density value is within the standard range;

[0100] If not, remove the true density value from the true density set.

[0101] In one embodiment, the detection device control module 301 is further configured to that the density difference between the ionic liquid and the powder material to be measured is less than a preset density difference threshold, and the density value of the ionic liquid is higher than the standard density value of the powder material to be measured.

[0102] The embodiment of the present application also discloses a computer device.

[0103] Specifically, the computer device includes a memory and a processor, and a computer program capable of being loaded and executed by the processor for the above-mentioned rapid detection method of powder material density is stored on the memory.

[0104] The embodiment of the present application also discloses a computer-readable storage medium.

[0105] Specifically, the computer-readable storage medium stores a computer program that can be loaded and executed by a processor, such as the above-mentioned rapid detection method for the density of powder materials. The computer-readable storage medium includes, for example, various media that can store program codes, such as USB flash drives, external hard drives, read-only memories (ROM), random access memories (RAM), magnetic disks, or optical discs.

[0106] This specific embodiment is only an explanation of the present invention and is not a limitation thereof. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as it is within the scope of the claims of the present invention, it is protected by the patent law.

Claims

1. A rapid detection method for the density of powder materials, characterized in that, The rapid powder material density detection method is applied to a powder material density detection system. The powder material density detection system includes a detection device for performing powder material density detection work. The rapid powder material density detection method includes: Controlling the detection device to compress the powder material to be measured; When a preset stop condition is reached, controlling the detection device to stop compressing the powder material to be measured; Determining the material volume value of the powder material to be measured; Determining the material mass value of the powder material to be measured; Inputting the material volume value and the material mass value into a preset calculation formula to obtain the true density value corresponding to the powder material to be measured; The preset calculation formula is: ρ powder = M1 / (V1 - V2); Where ρ powder is the true density value of the powder material to be measured; M1 is the material mass value corresponding to the powder material to be measured; V1 is the volume value of the powder material to be measured and the ionic liquid in the container; V2 is the volume value of the ionic liquid; The detection device at least includes: a gravity piston device, a hydraulic pump device, and a resistance monitoring device; The controlling the detection device to compress the powder material to be measured specifically includes: Obtaining a start instruction; Measuring the actual mass value corresponding to the container; If the actual mass value is higher than the preset standard container mass, controlling the gravity piston device to compress the powder material to be measured in the container under the condition of one standard atmosphere; Reading the bulk volume value of the powder material in the container device; Starting the hydraulic pump device and controlling the hydraulic pump device to press the ionic liquid into the container; When the stop condition is reached, controlling the detection device to stop compressing the powder material to be measured specifically includes: When the gravity piston device compresses the powder device to be measured in the container, controlling the resistance monitoring device to monitor the resistance corresponding to the container in real time to obtain a number of resistance values; Calculating the change difference of the resistance corresponding to the container using the resistance values; When the change difference is 0, controlling the hydraulic pump device to stop pumping the ionic liquid into the container.

2. The rapid detection method for the density of the powder material according to claim 1, wherein The rapid powder material density detection method further includes: Controlling the detection device to compress the powder materials to be measured with several different material mass values; Detecting the density of the powder to be measured to obtain a true density set, and the true density set includes several true density values; Calculating the average value of several true density values in the true density set, and recording the average value as the measurement result of the true density value of the powder material to be measured.

3. The rapid detection method for the density of the powder material according to claim 2, wherein, After detecting the density of the powder to be measured to obtain a true density set, it further includes: Obtaining several true density values in the true density set; Judging whether the true density value is within the standard range; If not, removing the true density value from the true density set.

4. The rapid detection method for the density of powder materials according to claim 1, characterized in that The density difference between the ionic liquid and the powder material to be measured is less than a preset density difference threshold, and the density value of the ionic liquid is higher than the standard density value of the powder material to be measured.

5. A rapid detection device for the density of powder materials, characterized in that, The rapid powder material density detection device is used to implement the rapid powder material density detection method according to any one of claims 1-4. The rapid powder material density detection device includes: The detection device control module (301) is used to control the detection device to perform compression processing on the powder material to be tested; The powder material compression module (302) is used to control the detection device to stop the compression processing of the powder material to be tested when a preset stop condition is reached; The material volume determination module (303) is used to determine the material volume value of the powder material to be tested; The material mass determination module (304) is used to determine the material mass value of the powder material to be tested; The true density value calculation module (305) is used to input the material volume value and the material mass value into a preset calculation formula to obtain the true density value corresponding to the powder material to be tested.

6. A computer device, characterized in that, It includes a memory and a processor, and a computer program capable of being loaded and executed by the processor for any one of the powder material density rapid detection methods as claimed in claims 1 to 4 is stored on the memory.

7. A computer-readable storage medium, characterized in that, A computer program capable of being loaded and executed by the processor for any one of the powder material density rapid detection methods as claimed in claims 1 to 4 is stored.

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