Areal density synchronous measurement method, device, equipment and medium

Abstract

The application discloses a kind of area density synchronous measurement method, device, equipment and medium, wherein, area density synchronous measurement method includes: obtaining the running length L1 between the first area density instrument to the second area density instrument when synchronously running;Obtain the running length L2 between the first area density instrument to the second area density instrument when actually running;According to L1 and L2, determine the compensation value ΔL of the second area density instrument, wherein, ΔL=(L1-L2) / 2.In this way, in the actual measurement process, the second area density instrument is compensated by compensation value ΔL, so that the scanning track of the first area density instrument and the second area density instrument coincides, so that the area density of coating can be accurately calculated.

Description

Technical Field

[0001] This application relates to the field of areal density measurement technology, and in particular to a method, apparatus, equipment and medium for synchronous areal density measurement. Background Technology

[0002] In the lithium battery manufacturing process, the surface density of single-sided and double-sided coatings of dry film lithium battery electrodes is measured by two surface density meters, which measure the surface density of the substrate, single-sided electrode (substrate + A-side coating), and double-sided electrode (substrate + A and B-side coatings) respectively.

[0003] In the relevant technology, the two areal density meters have poor synchronization during use, which affects the accuracy of coating areal density detection. Summary of the Invention

[0004] In view of the above problems, this application provides a method, apparatus, equipment and medium for synchronous measurement of areal density, which can solve the problem of poor synchronization between two areal density meters during use.

[0005] To address the aforementioned technical problems, in a first aspect, this application proposes a method for synchronous measurement of areal density, the method comprising:

[0006] Obtain the tape length L1 between the first and second surface density meters during synchronous operation;

[0007] Obtain the conveyor belt length L2 between the No. 1 and No. 2 surface density meters during actual operation, which includes:

[0008] The starting position of the first coating mechanism is detected by the first color mark sensor;

[0009] The starting position of the second coating mechanism is detected by the second color mark sensor;

[0010] The position of the second color mark sensor is corrected by the correction mechanism so that the starting position of the second coating mechanism coincides with the starting position of the first coating mechanism.

[0011] The tape length L2 is obtained based on the position of the second color mark sensor after correction and the position of the first color mark sensor;

[0012] The compensation value ΔL of the second surface density meter is determined based on L1 and L2, where ΔL = (L1 - L2) / 2.

[0013] In the technical solution of this application embodiment, the second surface density meter is compensated by the compensation value △L so that the scanning trajectories of the first and second surface density meters overlap. This ensures that the first and second surface density meters detect the same position, and the surface density of the coating can be accurately calculated based on the difference between the second and first surface density meters.

[0014] In some embodiments, after determining the compensation value ΔL of the second areal density instrument according to L1 and L2, the method further comprises:

[0015] determining the size of ΔL and threshold L3, under the condition of ΔL>L3, the second areal density instrument does not compensate; under the condition of ΔL≤L3, the second areal density instrument compensates. In this way, it can avoid the error compensation in the process of synchronous scanning of multiple measuring instruments and inter-arch walking distance verification.

[0016] In some embodiments, the areal density synchronous measurement method further comprises an alarm system;

[0017] Under the condition of ΔL>L3, the alarm system alarms. In this way, it can effectively remind the staff to operate in time.

[0018] In some embodiments, the detection of the start-up position of the first coating mechanism by the first color mark sensor comprises:

[0019] determining whether the signal detected by the first color mark sensor is continuous within a preset time period; if yes, determining the start-up position of the first coating mechanism, and if not, determining the start-up position of the first coating mechanism after the first color mark sensor detects a continuous signal. In this way, it can avoid discontinuous start-up and broken line situation, so that the detection signal of the first color mark sensor is intermittent, which will lead to the misjudgment of the inter-arch distance.

[0020] In some embodiments, the detection of the start-up position of the first coating mechanism by the first color mark sensor comprises:

[0021] determining whether there is a coating area on the substrate to be coated before coating; if yes, determining the start-up position of the first coating mechanism after the substrate rotates by a preset length. Since there is a coating area on the substrate before each roll change or each arch, although these two situations can also detect a continuous signal, the coating area is not the area to be measured, which will lead to misjudgment. By determining the start-up position of the first coating mechanism after the substrate rotates by a preset length, it can effectively avoid misjudgment.

[0022] Secondly, the application provides an areal density synchronous measurement device, comprising:

[0023] a first acquisition module for acquiring the walking length L1 between the first areal density instrument and the second areal density instrument when they are running synchronously;

[0024] a second acquisition module for acquiring the walking length L2 between the first areal density instrument and the second areal density instrument when they are actually running, which comprises:

[0025] The first detection module is configured to detect a starting position of the first coating mechanism by the first color mark sensor.

[0026] The second detection module is configured to detect a starting position of the second coating mechanism by the second color mark sensor.

[0027] The correction module is configured to correct the position of the second color mark sensor by the correction mechanism, so that the starting position of the second coating mechanism coincides with the starting position of the first coating mechanism.

[0028] The third acquisition module is configured to acquire a running length L2 according to the position of the corrected second color mark sensor and the position of the first color mark sensor.

[0029] The determination module is configured to determine a compensation value AL of the second areal density instrument according to L1 and L2, where AL=(L1-L2) / 2.

[0030] In some embodiments, the areal density synchronous measurement device further comprises:

[0031] The determination module is configured to determine the size of AL and a threshold value L3, when AL>L3, the second areal density instrument does not compensate; when AL≤L3, the second areal density instrument compensates.

[0032] In some embodiments, the areal density synchronous measurement device further comprises:

[0033] The alarm module is configured to alarm when AL>L3.

[0034] In a third aspect, the present application provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor executes the computer program to realize the areal density synchronous measurement method according to any one of the embodiments of the present application.

[0035] In a fourth aspect, the present application provides a computer readable storage medium, which stores a computer program for realizing the areal density synchronous measurement method according to any one of the embodiments of the present application.

[0036] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, the following specific embodiments of the present application can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0037] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the implementation. The accompanying drawings are included to provide a description of the implementation and are not intended to limit the scope of the application. Moreover, in the drawings, like reference numerals designate similar parts throughout the various figures. In the drawings:

[0038] Figure 1 A flowchart of a surface density synchronous measurement method provided for some embodiments of the application;

[0039] Figure 2 A coating process schematic provided for some embodiments of the application;

[0040] Figure 3 A surface density instrument detection scanning schematic provided for some embodiments of the application;

[0041] Figure 4 Another surface density instrument detection scanning schematic provided for some embodiments of the application;

[0042] Figure 5 Another surface density instrument detection scanning schematic provided for some embodiments of the application;

[0043] Figure 6 A structural schematic of a computer device provided for some embodiments of the application.

[0044] Reference numerals in the detailed description of the implementation are as follows:

[0045] 11, unwinding mechanism; 12, base material; 121, A surface; 122, B surface; 13, first back roller; 14, first coating mechanism; 15, first oven; 16, No. 1 surface density instrument; 17, second coating mechanism; 18, second back roller; 19, second oven; 20, No. 2 surface density instrument; 21, winding mechanism; 22, deviation correction mechanism. Detailed description of the implementation

[0046] The embodiments of the technical solutions of the application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the application, and therefore only serve as examples, and cannot limit the protection scope of the application.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the application; the terms "include" and "have" and any variations thereof in the specification and claims of the application and the above description of drawings are intended to cover non-exclusive inclusion.

[0048] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise explicitly specified and limited.

[0049] Reference herein to "embodiments" means that the particular features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily a separate or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0050] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after it.

[0051] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two), and similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0052] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0053] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing", and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0054] At present, from the development of market situation, the application of power battery is more and more widely. Power battery is not only applied to energy storage power supply system of water power, fire power, wind power and solar power station, but also widely used in electric bicycle, electric motorcycle, electric vehicle and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of power battery, the demand of its market is also increasing.

[0055] In the production process of lithium battery, the single and double-sided coating area density of dry film lithium battery pole piece is mainly measured by multiple area density measuring instruments to measure the area density of substrate, single-sided pole piece (substrate + A-side coating) and double-sided pole piece (substrate + A, B-side coating).

[0056] The measuring instrument in the related art has poor synchronization when used, and the same point accuracy is poor when high-speed scanning, which is greater than ± 20mm; there is a large scanning position error of single and double layers, which leads to large measurement error of single and double-sided coating net weight synchronous scanning deduction, so that the area density of B-side coating cannot be accurately calculated.

[0057] Based on the above consideration, in order to solve the problem that the synchronization of two area density instruments is poor and the area density of B-side coating cannot be accurately calculated during use, a method for synchronous measurement of area density is designed, which comprises the following steps: obtaining the running length L1 between the first area density instrument and the second area density instrument when they are synchronously running; obtaining the running length L2 between the first area density instrument and the second area density instrument when they are actually running; determining the compensation value AL of the second area density instrument according to L1 and L2, wherein AL=(L1-L2) / 2.

[0058] The second area density instrument is compensated by the compensation value AL, so that the scanning tracks of the first area density instrument and the second area density instrument coincide, so that the same position can be detected by the first area density instrument and the second area density instrument, and thus the area density of the coating can be accurately calculated according to the difference between the second area density instrument and the first area density instrument.

[0059] According to some embodiments of the present application, Figure 1 The flowchart of the method for synchronous measurement of area density in the present application is shown in FIG. 1. Figure 1As shown, the application provides a surface density synchronous measurement method, which comprises: obtaining a running length L1 between a first surface density instrument and a second surface density instrument when they are synchronously running; obtaining a running length L2 between the first surface density instrument and the second surface density instrument when they are actually running, which comprises: detecting a starting coating position of a first coating mechanism through a first color mark sensor; detecting a starting coating position of a second coating mechanism through a second color mark sensor; correcting the position of the second color mark sensor through a correction mechanism 22 so that the starting coating position of the second coating mechanism coincides with the starting coating position of the first coating mechanism; and obtaining the running length L2 according to the position of the corrected second color mark sensor and the position of the first color mark sensor.

[0060] Determining a compensation value AL of the second surface density instrument according to L1 and L2, wherein AL=(L1-L2) / 2.

[0061] Reference Figure 2 As shown, Figure 2 The figure is a schematic diagram of the coating process in the application, wherein after the unwinding mechanism 11 releases the substrate 12, the substrate 12 will pass through the first back roll 13, the first oven 15, the first surface density instrument 16, the second back roll 18, the second oven 19, the second surface density instrument 20 in turn, and then enter the winding mechanism 21. When the substrate 12 passes through the first back roll 13, the first coating mechanism 14 will coat the A surface 121 of the substrate 12, and when the substrate 12 passes through the second back roll 18, the second coating mechanism 17 will coat the B surface of the substrate 12.

[0062] The unwinding mechanism 11 in the embodiment can include an unwinding roll, a motor and a rack, the two ends of the unwinding roll are connected to the rack through a rotating shaft, the motor is fixed on the rack, and the output shaft of the motor is connected with the rotating shaft on the unwinding roll. The unwinding roll can release the substrate to be coated by rotating the rotating shaft through the motor. Of course, it can be understood that the unwinding mechanism 11 in the embodiment can also have other structures, for example, the unwinding mechanism 11 includes an unwinding roll, a transmission gear and a motor, which can be determined according to the actual situation, and the embodiment of the specification is not limited in this regard.

[0063] The substrate 12 on the unwinding mechanism 11 in the embodiment can be a copper foil, an aluminum foil, a stainless steel and other coating substrates with good conductivity, which can be determined according to the actual situation, and the embodiment of the specification is not limited in this regard.

[0064] The substrates in the embodiment are regular structures, and the first surface and the second surface of the commonly seen regular-shaped substrate are opposite, and the two edges of the first surface and the two edges of the second surface are projected to coincide in the width direction of the substrate. In the shaped substrate, the first surface and the second surface can be staggered.

[0065] The winding mechanism 21 in the embodiment can include a winding roller, a motor and a rack, the two ends of the winding roller are connected to the rack through a rotating shaft, the motor is fixed on the rack, and the output shaft of the motor is connected with the rotating shaft on the winding roller. The winding roller can be driven to rotate by the motor, so that the coated substrate enters the winding roller to form a roll. Of course, it can be understood that the winding mechanism 21 in the embodiment can also have other structures, for example, the winding mechanism 21 includes a winding roller, a transmission gear and a motor, which can be determined according to the actual situation, and the embodiment of the present application does not limit this.

[0066] The coating speed direction in the embodiment is as shown in Figure 3 or Figure 4 or Figure 5 V1 in the embodiment.

[0067] In the embodiment, the walking length L2 is obtained according to the position of the second color mark sensor after correction and the position of the first color mark sensor, so that the coating starting position of the second coating mechanism coincides with the coating starting position of the first coating mechanism, thereby the walking length L2 can be accurately calculated.

[0068] In use, as shown in Figure 3 , the walking length L1 between the first area density instrument 16 and the second area density instrument 20 in synchronous operation is obtained; then the walking length L2 between the first area density instrument 16 and the second area density instrument 20 in actual operation is obtained; finally, the compensation value AL of the second area density instrument is determined according to L1 and L2, wherein AL=(L1-L2) / 2. In this way, in the actual measurement process, the distance compensation is performed on the second area density instrument 20, so that the measurement path of the first area density instrument 16 coincides with the measurement path of the second area density instrument 20. After the area density of surface A is measured by the first area density instrument 16 and the area density of surface A+B is measured by the second area density instrument 20, the area density of surface B can be accurately calculated by the difference between the second area density instrument and the first area density instrument. Moreover, the walking length L2 is obtained according to the position of the second color mark sensor after correction and the position of the first color mark sensor, so that the coating starting position of the second coating mechanism coincides with the coating starting position of the first coating mechanism, thereby the walking length L2 can be accurately calculated.

[0069] According to some embodiments of the present application, after the compensation value AL of the second area density instrument is determined according to L1 and L2, the method further includes:

[0070] determining the size of AL and a threshold value L3, under the condition that AL>L3, the second area density instrument does not compensate; under the condition that AL≤L3, the second area density instrument compensates. Since the calculation of AL will have errors in the case that the substrate tension changes greatly and the encoder wheel on the back roller slips, at this time, it is judged whether AL is greater than L3, if so, the second area density instrument is not compensated.

[0071] According to some embodiments of the present application, the areal density synchronous measurement method further comprises an alarm system;

[0072] Under the condition of ΔL>L3, the alarm system alarms. In this way, the staff can be effectively reminded to operate in time, and the fault working condition can be avoided.

[0073] According to some embodiments of the present application, the start position of the first coating mechanism is detected by the first color mark sensor, comprising:

[0074] It is judged whether the signal detected by the first color mark sensor is continuous within a preset time period; if yes, the start position of the first coating mechanism is determined, and if no, the start position of the first coating mechanism is determined after the first color mark sensor detects a continuous signal.

[0075] Referring to Figure 4 , it can be seen that Figure 4 The start position of the left black part is not continuous, so the detection signal of the first color mark sensor is intermittent, which will cause the walking length L2 to be measured incorrectly. In this embodiment, the start position of the first coating mechanism is determined only after the signal detected by the first color mark sensor is determined to be a continuous signal within a preset time, so that the walking length L2 can be measured correctly.

[0076] According to some embodiments of the present application, the start position of the first coating mechanism is detected by the first color mark sensor, comprising:

[0077] It is judged whether there is a coating area on the substrate to be coated before coating, and if yes, the start position of the first coating mechanism is determined after the substrate rotates by a preset length.

[0078] Referring to Figure 5 , it can be seen that Figure 5 The left interval black part is a roll changing place or a coating area of the substrate before each reel, and although continuous signals can be detected in these two cases, the coating area is not the area to be measured, which will cause incorrect detection. By determining the start position of the first coating mechanism after the substrate rotates by a preset length, incorrect detection can be effectively avoided.

[0079] The present application also provides an areal density synchronous measurement device, comprising:

[0080] The first acquisition module is used to acquire the walking length L1 between the No. 1 areal density instrument and the No. 2 areal density instrument when they are synchronously running;

[0081] The second acquisition module is configured to acquire a running length L2 between the first area density instrument and the second area density instrument in actual operation, and includes: a first detection module configured to detect a starting position of the first coating mechanism by using a first color mark sensor; a second detection module configured to detect a starting position of the second coating mechanism by using a second color mark sensor; a deviation correction module configured to correct a position of the second color mark sensor by using a deviation correction mechanism 22, so that the starting position of the second coating mechanism coincides with the starting position of the first coating mechanism; and a third acquisition module configured to acquire the running length L2 according to the position of the second color mark sensor after correction and the position of the first color mark sensor.

[0082] The determining module is configured to determine a compensation value AL of the second area density instrument according to L1 and L2, where AL=(L1-L2) / 2.

[0083] It should be understood that the units or modules described in the above device correspond to the respective steps in the method described with reference to Figure 1 The operations and features described above with respect to the method also apply to the device and the modules included therein, and thus will not be described here again.

[0084] According to some embodiments of the present application, the area density synchronous measurement device further includes:

[0085] The determining module is configured to determine a compensation value AL of the second area density instrument according to L1 and L2, where AL=(L1-L2) / 2.

[0086] According to some embodiments of the present application, the area density synchronous measurement device further includes:

[0087] The alarm module is configured to alarm when AL>L3. In this way, the staff can be effectively reminded to operate in time, so as to avoid being in a fault condition all the time.

[0088] The computer device provided in the embodiments of the present application includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the area density synchronous measurement method as described above when executing the program.

[0089] Reference will be made to the accompanying drawings to Figure 6 , Figure 6 is a structural schematic diagram of the computer device in the embodiments of the present application.

[0090] As Figure 6As shown, the computer system 300 includes a central processing unit (CPU) 301 that can perform various suitable actions and processes in accordance with programs stored in a read-only memory (ROM) 302 or loaded from a storage section 303 into a random access memory (RAM) 303. Various programs and data required for the operation of the system 300 are also stored in the RAM 303. The CPU 301, the ROM 302, and the RAM 303 are connected to each other through a bus 304. An input / output (I / O) interface 305 is also connected to the bus 304.

[0091] Connected to the I / O interface 305 are an input section 306 including a keyboard, a mouse, etc.; an output section 307 including a display such as a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker, etc.; a storage section 308 including a hard disk, etc.; and a communication section 309 including a network interface card such as a LAN card, a modem, etc. The communication section 309 performs communication processing via a network such as the Internet. A drive 310 is also connected to the I / O interface 305 as necessary. A removable media 311 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc. is attached to the drive 310 as necessary, so that a computer program read therefrom is installed into the storage section 308 as necessary.

[0092] In particular, the processes described above with reference to the flowcharts can be implemented as a computer software program in accordance with embodiments of the present application. For example, embodiments of the present application include a computer program product comprising a computer program carried on a machine-readable medium, the computer program containing program code for executing the methods illustrated by the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network by the communication section 303, and / or installed from the removable media 311. When the computer program is executed by the central processing unit (CPU) 301, the above-described functions defined in the system of the present application are executed.

[0093] It should be noted that the computer-readable medium shown in the present application can be a computer-readable signal medium or a computer-readable storage medium or any combination thereof. The computer-readable storage medium may, for example, be—but is not limited to— an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination thereof. More specific examples of the computer-readable storage medium can include, but are not limited to, an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof.

[0094] As another aspect, the present application also provides a computer readable storage medium, which can be included in the device described in the above embodiments, or can exist separately without being assembled into the device. The computer readable storage medium stores one or more programs, and the programs are used by one or more processors to execute the areal density synchronous measurement method described in the present application.

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the above embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method of areal density synchronization measurement, characterized by, The method comprises: acquiring a running length L1 between the first area density instrument and the second area density instrument when they are synchronously running; acquiring a running length L2 between the first area density instrument and the second area density instrument when they are actually running, which comprises: detecting a starting position of the first coating mechanism by a first color mark sensor; detecting a starting position of the second coating mechanism by a second color mark sensor; correcting the position of the second color mark sensor by a correction mechanism so that the starting position of the second coating mechanism coincides with the starting position of the first coating mechanism; acquiring the running length L2 according to the corrected position of the second color mark sensor and the position of the first color mark sensor; determining a compensation value ΔL of the second area density instrument according to L1 and L2, wherein ΔL=(L1-L2) / 2.

2. The areal density synchronization measurement method according to claim 1, characterized by, After determining the compensation value ΔL of the second area density instrument according to L1 and L2, the method further comprises: determining the size of ΔL and a threshold value L3, and under the condition of ΔL>L3, the second area density instrument does not compensate; under the condition of ΔL≤L3, the second area density instrument compensates.

3. The areal density synchronization measurement method according to claim 2, characterized by, The area density synchronous measurement method further comprises an alarm system; under the condition of ΔL>L3, the alarm system alarms.

4. The areal density synchronization measurement method of claim 1, wherein, The method of detecting the starting position of the first coating mechanism by the first color mark sensor comprises: determining whether the signal detected by the first color mark sensor is continuous within a preset time period, if yes, determining the starting position of the first coating mechanism, if not, determining the starting position of the first coating mechanism after the first color mark sensor detects the continuous signal.

5. The areal density synchronization measurement method of claim 1, wherein, The method of detecting the starting position of the first coating mechanism by the first color mark sensor comprises: determining whether there is a coating area on the substrate to be coated before coating, if yes, determining the starting position of the first coating mechanism after the substrate rotates by a preset length.

6. An areal density synchronisation measurement apparatus characterised in that, comprises: a first acquisition module for acquiring a running length L1 between the first area density instrument and the second area density instrument when they are synchronously running; a second acquisition module for acquiring a running length L2 between the first area density instrument and the second area density instrument when they are actually running, which comprises: a first detection module for detecting a starting position of the first coating mechanism by a first color mark sensor; a second detection module for detecting a starting position of the second coating mechanism by a second color mark sensor; a correction module for correcting the position of the second color mark sensor by a correction mechanism so that the starting position of the second coating mechanism coincides with the starting position of the first coating mechanism; a third acquisition module for acquiring the running length L2 according to the corrected position of the second color mark sensor and the position of the first color mark sensor; a determination module for determining a compensation value ΔL of the second area density instrument according to L1 and L2, wherein ΔL=(L1-L2) / 2.

7. The areal density synchronization measurement apparatus according to claim 6, wherein The area density synchronous measurement device further comprises: a judgment module for determining the size of ΔL and a threshold value L3, and under the condition of ΔL>L3, the second area density instrument does not compensate; under the condition of ΔL≤L3, the second area density instrument compensates.

8. The areal density synchronization measurement apparatus according to claim 6, wherein The area density synchronous measurement device further comprises: an alarm module for alarming when ΔL>L3.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, The processor implements the surface density synchronous measurement method as claimed in any one of claims 1 to 5 when executing the computer program.

10. A computer readable storage medium having stored thereon a computer program for implementing the surface density synchronous measurement method as claimed in any one of claims 1 to 5.

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