Electrostatic imaging method and electrostatic imaging device

Abstract

The invention provides an electrostatic imaging method and an electrostatic imaging device, and the method comprises the steps: enabling each electric field sensitive element in an electrostatic sensor to sense a charge signal in each unit region of a detected object, so as to obtain a simulation charge signal of each unit; obtaining a digital charge signal value of each unit according to the analog charge signal of each unit, and storing the digital charge signal value to a corresponding storage area; obtaining a sensitive element surface electric field value of each electric field sensitive element according to each unit digital charge signal value, and storing the sensitive element surface electric field value in a corresponding storage area; and inputting the digital charge signal value of each unit or the surface electric field value of each sensitive element into the electric field intensity-position distribution table to obtain an electric field image of the measured object, and dividing unit gradient color blocks corresponding to the unit areas in the electric field image. According to the invention, the number of perceived charge signals can be increased, the charge conditions of a plurality of different unit areas in the detected area can be obtained, and after arrangement according to physical positions, the electrostatic gradient color block map of the detected object can be obtained more accurately.

Description

Technical Field

[0001] The present invention relates to the field of sensor imaging, in particular to an electrostatic imaging method and an electrostatic imaging device. Background Art

[0002] The hazards of static electricity to the production line mainly include fire and explosion hazards, electric shock injuries, electronic equipment failures, equipment damage, product quality degradation, and personal safety hazards.

[0003] In the existing various devices for testing electrostatic fields, usually only the comprehensive electric field value of the surface of the measured object can be obtained, and the charge distribution on the surface of the measured object cannot be more intuitively displayed through the electric field value. Summary of the invention

[0004] In response to the shortcomings existing in the above-mentioned problems, the present invention provides an electrostatic imaging method and an electrostatic imaging device which can increase the number of perceived charge signals, obtain the charge conditions of multiple different unit areas in the measured area, and after arranging them according to the physical positions, more accurately obtain the electrostatic gradient color block map of the measured object, thereby more intuitively displaying the charge distribution conditions of the measured area.

[0005] To achieve the above object, in a first aspect, the present invention provides an electrostatic imaging method, comprising the following steps:

[0006] Each electric field sensitive element in the electrostatic sensor senses the charge signal in each unit area of ​​the measured object to obtain the analog charge signal of each unit;

[0007] After obtaining the digital charge signal value of each unit according to the analog charge signal of each unit, the digital charge signal value of each unit is stored in the corresponding storage area;

[0008] After obtaining the surface electric field value of each electric field sensitive element according to each unit digital charge signal value, the value is stored in a corresponding storage area;

[0009] According to the physical address, the digital charge signal value of each unit or the surface electric field value of each sensitive element is input into the electric field strength-position distribution table to obtain the electric field image of the object under test, wherein the electric field image is divided into unit gradient color blocks corresponding to each unit area.

[0010] In one embodiment, the electrostatic sensor includes a plurality of electric field sensing elements and a main control module, and the plurality of electric field sensing elements are in contact with each other, wherein:

[0011] Each of the electric field sensing elements includes a circuit board and N electric field sensitive elements solidified in the same area of ​​the circuit board, the N electric field sensitive elements face the object to be measured, sense and obtain the unit analog charge signal of each unit area in each sensing area of ​​the object to be measured, wherein N≥2, the number of the electric field sensitive elements is the same as the number of the unit areas, and the position of each electric field sensitive element corresponds to the position of each unit area.

[0012] In one embodiment, after obtaining the digital charge signal value of each unit according to the analog charge signal of each unit, saving it in a corresponding storage area includes:

[0013] Converting each of the unit analog charge signals into a corresponding each of the unit digital charge signals;

[0014] Filtering each of the unit digital charge signal values ​​to eliminate interference signals in each of the unit digital charge signals to obtain each of the unit digital charge signal values;

[0015] According to the physical address of each electric field sensitive element, the corresponding unit digital charge signal value is stored in a storage area corresponding to the physical address in the memory.

[0016] In one of the embodiments, after obtaining the surface electric field value of each electric field sensitive element according to each unit digital charge signal value, saving it in a corresponding storage area includes:

[0017] Calibrate the electrostatic sensor to obtain a sensor surface electric field value of the electrostatic sensor;

[0018] Obtaining a sensitivity coefficient corresponding to a current value of the unit digital charge signal according to the sensor surface electric field value and each of the unit digital charge signal values;

[0019] Obtaining the surface electric field value of the sensitive element of each electric field sensing element according to the corresponding digital charge signal value and the sensitivity coefficient;

[0020] According to the physical address of each electric field sensing element in the electrostatic sensor, the surface electric field value of the corresponding sensitive element is stored in a storage area corresponding to the physical address in the memory.

[0021] In one embodiment, inputting the digital charge signal value of each unit or the surface electric field value of each sensitive element into an electric field strength-position distribution table according to the physical address to obtain the electric field image of the object under test includes:

[0022] In the electric field strength-position distribution table, a corresponding unit color block is obtained according to the surface electric field value of each of the sensitive elements or the value of each of the unit digital charge signals;

[0023] The unit color blocks are sequentially placed at designated positions in the electric field image template according to the physical addresses to form an electric field image corresponding to the charge distribution of the object under test.

[0024] In one embodiment, it also includes:

[0025] The unit color block is subjected to a gradient process to form a unit gradient color block.

[0026] In a second aspect, the present invention further provides an electrostatic imaging device for implementing the above-mentioned electrostatic imaging method, comprising:

[0027] The electrostatic sensor comprises a plurality of electric field sensing elements and a main control module, wherein the plurality of electric field sensing elements are in contact with each other, wherein:

[0028] Each of the electric field sensing elements includes a circuit board, and N electric field sensitive elements solidified in the same area of ​​the circuit board, the N electric field sensitive elements face the object to be measured, sense and obtain the unit analog charge signal of each unit area in each sensing area of ​​the object to be measured, wherein N≥2, the number of the electric field sensitive elements is the same as the number of the unit areas, and the position of each electric field sensitive element corresponds to the position of each unit area;

[0029] The main control module is connected to each of the electric field sensing elements, obtains the unit digital charge signal value corresponding to each of the unit areas in each of the sensing areas, obtains the surface electric field value of the sensitive element corresponding to each of the electric field sensing elements, and saves each of the unit digital charge signal value and each of the surface electric field value of the sensitive element;

[0030] An imaging module is connected to the main control module, inputs the read digital charge signal values ​​of each unit or the surface electric field values ​​of each sensitive element into an electric field strength-position distribution table, processes the digital charge signal values ​​of each unit or the surface electric field values ​​of each sensitive element to obtain an electric field image of the object under test, wherein the electric field image is divided into unit gradient color blocks corresponding to each unit area.

[0031] In one embodiment, the main control module includes an analog-to-digital conversion module, a processor and a data communication module, wherein:

[0032] The analog-to-digital conversion module is connected to each of the electric field sensing elements and the processor, respectively, and is used to convert each of the unit analog charge signals into each unit digital charge signal value;

[0033] The processor is connected to the analog-to-digital conversion module and the data communication module respectively, and obtains the unit digital charge signal value corresponding to each unit area in each sensing area, and obtains the surface electric field value of the sensitive element corresponding to each electric field sensing element;

[0034] The data communication module is used to read and call the digital charge signal value of each unit or the surface electric field value of each sensitive element stored in the processor, and input the digital charge signal value of each unit or the surface electric field value of each sensitive element into the imaging module.

[0035] In one embodiment, the processor includes:

[0036] A filtering unit, used for filtering each of the unit digital charge signal values ​​to eliminate interference signals in each of the digital charge signals to obtain each of the unit digital charge signal values;

[0037] A calculation module, used to obtain a sensitivity coefficient corresponding to each of the unit digital charge signal values, and to obtain a surface electric field value of a sensitive element of each of the electric field sensing elements;

[0038] The memory includes a plurality of storage areas for storing the digital charge signal value of each unit according to the physical address of each unit area in each sensing area, and for storing the surface electric field value of each sensitive element according to the physical address of each unit area in the object to be measured.

[0039] In one embodiment, the electric field strength-position distribution table includes:

[0040] An analysis module, used for obtaining a corresponding unit color block according to the surface electric field value of each of the sensitive elements or the value of each of the unit digital charge signals;

[0041] An electric field image template, used for receiving each of the unit color blocks and placing the unit color blocks at designated positions in the electric field image template according to physical addresses;

[0042] A pattern generation module, which is used to perform gradient processing on each of the unit color blocks, or the unit color blocks and the matching color blocks, to form each unit gradient color block;

[0043] The pattern synthesis module is used to synthesize the unit gradient color blocks in the electric field image template to form an electric field image corresponding to the charge distribution of the object to be measured.

[0044] Compared with the prior art, the present invention has one of the following advantages:

[0045] In the imaging method provided by the present invention, since each electric field sensing element includes a plurality of electric field sensitive elements, the number of sensed charge signals can be increased, and the charge conditions of a plurality of different unit areas in the measured area can be obtained. After the electric field sensitive elements are arranged according to their physical positions, the electrostatic gradient color block diagram of the measured object can be obtained more accurately, thereby more intuitively displaying the charge distribution of the measured area.

[0046] Since more detailed charge distribution is obtained, static elimination devices can be installed in a targeted manner according to the charge distribution, thus avoiding excessive consumption of static elimination devices;

[0047] The electric field strength-position distribution table can generate a corresponding electric field image according to the digital charge signal value of each unit or the surface electric field value of each unit sensitive element. Since the setting conditions in the electric field strength-position distribution table can be modified, the corresponding electric field image can be generated according to different needs.

[0048] The image in the perception area is formed by merging multiple unit gradient color blocks, and the electric field image is formed by merging images in multiple perception areas, so that the electric field image has a softer effect;

[0049] The data analysis model can determine whether to generate a warning instruction based on the analysis results, or generate a fault instruction when it is determined that the electric field sensing element has a fault and the collected analog charge signals are incorrect;

[0050] By comparing the physical address of the unit area with too high electric field amplitude in the object under test with the physical address of the dark area in the electric field image, it can be determined whether the collection and analysis results of the charge signal on the surface of the object under test are accurate;

[0051] By solidifying the electric field sensing elements, analog-to-digital conversion module, processor and data communication module on the same circuit board, the size of the electrostatic sensor can be reduced;

[0052] A plurality of electric field sensitive elements are solidified on the electric field sensing element, so that the number of charge signals obtained can be increased without increasing the number of electric field sensing elements. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 is a flow chart of the electrostatic imaging method of the present invention;

[0054] Figure 2 is a flow chart of a first embodiment of an electrostatic imaging method according to the present invention;

[0055] Figure 3 is a flow chart of a second embodiment of the electrostatic imaging method of the present invention;

[0056] Figure 4is a structural block diagram of the electrostatic imaging device in the present invention;

[0057] Figure 5 for Figure 4 The structural block diagram of the electrostatic sensor;

[0058] Figure 6 for Figure 5 The structural block diagram of an embodiment of an electrostatic sensor;

[0059] Figure 7 for Figure 4 The structural block diagram of the main control module;

[0060] Figure 8 for Figure 4 Structural block diagram of the imaging module.

[0061] The main reference numerals are as follows:

[0062] 1-electrostatic sensor; 101-electric field sensing element; 1010-first electric field sensitive element 1010; 1011-second electric field sensitive element; 102-main control module; 1021-analog-to-digital conversion module; 1022-processor; 1023-data communication module; 2-imaging module; 201-analysis module; 202-pattern generation module; 203-electric field image template; 204-pattern synthesis module; 3-shielding shell. DETAILED DESCRIPTION

[0063] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0064] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "top surface", "bottom surface", "inside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally arranged component at the same time. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0065] like Figure 1As shown, the present invention provides an electrostatic imaging method, comprising the following steps:

[0066] Each electric field sensitive element in the electrostatic sensor senses the charge signal in each unit area of ​​the measured object to obtain the analog charge signal of each unit;

[0067] After obtaining the digital charge signal value of each unit according to the analog charge signal of each unit, the digital charge signal value of each unit is saved in the corresponding storage area according to the corresponding relationship;

[0068] Obtaining the surface electric field value of each electric field sensitive element according to the digital charge signal value of each unit, and saving the surface electric field value of each sensitive element to a corresponding storage area according to the corresponding relationship;

[0069] According to the physical address, the digital charge signal value of each unit or the surface electric field value of each sensitive element is input into the electric field strength-position distribution table to obtain the electric field image of the object under test, wherein the electric field image is divided into unit gradient color blocks corresponding to each unit area.

[0070] In the above method provided by the present invention, since each electric field sensing element includes multiple electric field sensitive elements, the number of sensed charge signals can be increased, and the charge conditions of multiple different unit areas in the measured area can be obtained. After arranging the electric field sensitive elements according to their physical positions, a more detailed electrostatic gradient color block map of the object to be measured can be accurately obtained, thereby more intuitively displaying the charge distribution of the measured area.

[0071] like Figure 2 As shown, this embodiment provides an electrostatic imaging method, comprising the following steps:

[0072] S101. Each electric field sensitive element in the electrostatic sensor senses a charge signal in each unit area of ​​the object to be measured to obtain an analog charge signal of each unit.

[0073] Specifically, the electrostatic sensor includes a plurality of electric field sensing elements and a main control module, each of the electric field sensing elements is electrically connected to the main control module, and the plurality of electric field sensing elements are in contact with each other, and no insulating strip is provided between two adjacent electric field sensing elements.

[0074] Each electric field sensing element includes a circuit board and N electric field sensitive elements solidified in the same area of ​​the circuit board. The N electric field sensitive elements face the object under test, sense and obtain unit analog charge signals of each unit area in each sensing area of ​​the object under test, where N≥2.

[0075] The number of the electric field sensitive elements is the same as the number of the unit regions, and the position of each electric field sensitive element corresponds to the position of each unit region.

[0076] Furthermore, the electrostatic sensor includes a plurality of electric field sensing elements, which are arranged in the electrostatic sensor according to their physical addresses, and each electric field sensing element includes a plurality of electric field sensitive elements, which are arranged in the electric field sensing element according to its physical address. The object to be measured includes a plurality of sensing areas, which are arranged on the surface of the object to be measured according to their physical addresses, and each sensing area includes a plurality of unit areas, and the physical address of the electric field sensing element in the electrostatic sensor is the same as the physical address of the unit area in the sensing area, and in each electric field sensitive element and each unit area corresponding to each other, the physical address of the electric field sensitive element in the electric field sensing element is the same as the physical address of the unit area in the sensing area.

[0077] When the electrostatic sensor contacts the object to be measured along the moving axis, each electric field sensitive element can sense the unit analog charge signal of the unit area on the object to be measured corresponding to the position of each electric field sensitive element, wherein the number of the obtained unit analog charge signals is the same as the number of electric field sensitive elements.

[0078] Furthermore, the multiple electric field sensing elements in the electrostatic sensor can be divided into multiple groups, each electric field sensing element in each group is defined with a physical address, the object to be measured is divided into multiple sensing areas, each sensing area in each group is defined with a physical address, the sensing area is divided into multiple unit areas, each unit area is defined with a physical address, wherein the physical address of the electric field sensitive element corresponds to the physical address of the unit area.

[0079] Furthermore, the contact between the electrostatic sensor and the object to be measured specifically refers to that when the electrostatic sensor moves along the movement axis and passes through the upper area of ​​the object to be measured, the electrostatic sensor and the object to be measured are in contact with each other.

[0080] Preferably, the closer the distance between each electric field sensitive element in the electrostatic sensor and the object to be measured is, the more accurate the unit analog charge signal of the sensed unit area is.

[0081] S102 , converting the analog charge signal of each unit into a corresponding digital charge signal of each unit.

[0082] Specifically, the analog charge signal of each unit is converted into a corresponding digital charge signal of each unit through the analog-to-digital conversion module.

[0083] Among them, when each electric field sensitive element obtains the unit analog charge signal and sends the unit analog charge signal to the analog-to-digital conversion module, its position number (i.e., physical address) is added at the position before the unit analog charge signal or at the position after the unit analog charge signal, so that in subsequent operation steps, its position in the object under test can always be known according to the position number.

[0084] S103 , filtering each unit digital charge signal to obtain each unit digital charge signal value.

[0085] Specifically, each unit digital charge signal is filtered to eliminate interference signals in each unit digital charge signal to obtain each unit digital charge signal value.

[0086] In this embodiment, a programmable sliding average filter is used, and the filtering effect is controlled by adjusting the size of the sliding window.

[0087] Exemplarily, the digital charge signal of each unit is filtered using the following formula to obtain the digital charge signal value of each unit:

[0088]

[0089] Where y[n] is the output of the sliding average filter (ie, the unit digital charge signal value), x[n] is the input signal, and N is the size of the sliding window.

[0090] The main features of the sliding average filter include fast speed, good real-time performance and high smoothness, and it has a good inhibitory effect on periodic interference.

[0091] S104, storing the digital charge signal value of each unit in a corresponding storage area of ​​the memory.

[0092] Specifically, the memory includes several storage areas, and the physical address of each storage area in the memory corresponds to the physical address of each electric field sensitive element, so that each unit digital charge signal can be stored in the corresponding storage area according to its physical address.

[0093] The form of the physical address of the storage area in the memory is not limited in this application, and it is only necessary that the physical address of the sensing element can correspond to the physical address of the storage area.

[0094] S105 , calibrating the electrostatic sensor to obtain the electric field value on the sensor surface.

[0095] Specifically, a flat plate capacitor is used to calibrate the electrostatic sensor, and the electric field value on the surface of the sensor is obtained after the electrostatic sensor passes through the flat plate capacitor along the moving axis.

[0096] In this embodiment, the flat plate capacitor includes an upper metal plate and a lower metal plate spaced apart from each other, wherein the spacing between the two metal plates is approximately 20 cm. When calibrating the electrostatic sensor, a voltage is applied to the lower metal plate, and the upper metal plate is grounded, so that an electric field is formed between the upper metal plate and the lower metal plate. When the electrostatic sensor passes between the upper metal plate and the lower metal plate, the electric field value on the sensor surface is obtained using the following formula:

[0097]

[0098] Wherein, E is the electric field value on the sensor surface, U is the voltage value of the lower metal plate, and d is the distance value between the upper metal plate and the lower metal plate.

[0099] S106: Obtain a sensitivity coefficient corresponding to the current unit digital charge signal value.

[0100] Specifically, the following formula is used to obtain the sensitivity coefficient value of each unit digital charge signal value based on the sensor surface electric field value and each unit digital charge signal value obtained above:

[0101]

[0102] Where K is the sensitivity coefficient value, y[n] is the digital charge signal value of each unit obtained above, and v 0 is the digital charge signal value of each unit obtained when both the upper metal plate and the lower metal plate are grounded, and E is the electric field value on the sensor surface.

[0103] In one embodiment, the sensitivity coefficient value corresponds to the unit digital charge signal value. When the charge signals collected by the electric field sensitive elements are different, the obtained unit digital charge signal values ​​are also different, so that the sensitivity coefficient values ​​finally obtained are also different.

[0104] In one possible embodiment, the sensitivity coefficient value corresponds to the unit digital charge signal value. When the charge signals collected by each electric field sensitive element are the same, the obtained unit digital charge signal values ​​are also the same, so that the sensitivity coefficient values ​​finally obtained are also the same.

[0105] S107, obtaining the surface electric field value of each electric field sensitive element.

[0106] Specifically, the following formula is used to obtain the surface electric field value of the sensitive element of each electric field sensitive unit according to the sensitivity coefficient values ​​and the digital charge signal values ​​of each unit obtained above:

[0107]

[0108] Where E' is the surface electric field value of the sensitive element, K is the sensitivity coefficient value, y[n] is the digital charge signal value of each unit obtained above, and v 0 It is the digital charge signal value of each unit obtained when both the upper metal plate and the lower metal plate are grounded.

[0109] S108. Store the surface electric field value of each sensitive element in a corresponding storage area of ​​the memory.

[0110] Specifically, after obtaining the surface electric field value of each sensitive element, since the surface electric field value of the sensitive element corresponds to the unit digital charge signal value, the surface electric field value of the sensitive element can be stored in the corresponding storage area according to the physical address contained in the unit digital charge signal value.

[0111] S109, the serial data communication module calls the stored surface electric field value of the sensitive element or the digital charge signal value of each unit according to the physical address of the storage area, and inputs it into the electric field strength-position distribution table.

[0112] S110 , querying the corresponding unit color block according to the surface electric field value of each sensitive element or the digital charge signal value of each unit.

[0113] Preferably, in the electric field strength-position distribution table, a unit color block corresponding to the electric field value on the surface of the sensitive element is obtained according to a preset corresponding relationship.

[0114] Furthermore, after querying the surface electric field value of each sensitive element, the unit color block corresponding to the surface electric field value of each sensitive element is obtained.

[0115] Exemplarily, in the electric field strength-position distribution table, when the surface electric field value of the sensitive element is set to 0-2KV / M, the color of the corresponding unit color block is green, when the surface electric field value of the sensitive element is 2.1-4KV / M, the color of the corresponding unit color block is blue, when the surface electric field value of the sensitive element is 4.1-6KV / M, the color of the corresponding unit color block is yellow, when the surface electric field value of the sensitive element is 6.1-8KV / M, the color of the corresponding unit color block is purple, and when the surface electric field value of the sensitive element is 8.1-10KV / M, the color of the corresponding unit color block is red.

[0116] When the surface electric field value of the sensitive element input into the electric field strength-position distribution table by the serial data communication module is 3KV / M, the color of the corresponding unit color block is blue.

[0117] S111, generating unit gradient color blocks.

[0118] Specifically, the unit color block is divided into N color block units, where N≥2.

[0119] Furthermore, the sensitive element is divided into N color block units according to its surface electric field value, wherein the larger the surface electric field value of the sensitive element is, the smaller the number of color block units divided into the corresponding unit color block is, the less obvious the gradient effect in the unit gradient color block is, and the more the original color of the unit color block can be highlighted. This design can highlight the color of the unit color block, so that the charge distribution of the specified area in the measured object can be more intuitively known through the color.

[0120] Furthermore, when dividing the unit color blocks, the average value of the electric field value on the surface of the sensitive element can be obtained according to the number of the color block units to be divided, thereby obtaining a display effect of the unit gradient color blocks from light to dark.

[0121] Exemplarily, when the surface electric field value of the sensitive element is 0-2KV / M, the green unit color block is divided into 10 color block units, when the surface electric field value of the sensitive element is 2.1-4KV / M, the blue unit color block is divided into 8 color block units, when the surface electric field value of the sensitive element is 4.1-6KV / M, the blue unit color block is divided into 6 color block units, when the surface electric field value of the sensitive element is 6.1-8KV / M, the blue unit color block is divided into 4 color block units, and when the surface electric field value of the sensitive element is 8.1-10KV / M, the blue unit color block is divided into 2 color block units.

[0122] In addition, in another embodiment, in order to allow the unit gradient color block to present a softer display effect, the unit gradient color block may be overlapped with the matching color block to present a different display effect.

[0123] Specifically, at least one coordinated color block is divided into N' unit coordinated color blocks, where N'=N.

[0124] After N color block units and N' unit matching color blocks are superimposed and merged in sequence, a unit gradient color block is formed.

[0125] Furthermore, the color of the matching color block should be a light color to avoid excessive changes in the color of the unit color block after overlapping or merging due to the matching color block being too dark, thereby affecting the color judgment.

[0126] Exemplarily, the matching color block is light gray. After being gradient processed, it will not change the color of the unit color block after being superimposed and merged with the unit gradient color block, thereby affecting the color judgment.

[0127] S112, sequentially saving corresponding unit gradient color blocks in the electric field image template to form an electric field image.

[0128] Specifically, after obtaining each unit gradient color block, it is placed in the corresponding electric field image template according to its physical address, so as to be used to synthesize each unit gradient color block in the electric field image template to form an electric field image corresponding to the charge distribution of the object under test, and the electric field image is displayed through the imaging module.

[0129] After the electric field image is generated, the unit digital charge signal values ​​and the surface electric field values ​​of the sensitive element corresponding to the electric field sensing element stored in the memory are cleared, thereby waiting to receive and store the next batch of unit digital charge signal values ​​and surface electric field values ​​of the sensitive element.

[0130] Before the implementation of step S109, it also includes constructing an electric field strength-position distribution table according to preset conditions, wherein the preset conditions at least include setting the corresponding unit color block color according to the surface electric field value of the sensitive element, setting the number of color block units according to the size of the surface electric field value of the sensitive element, and setting the style of the electric field image template according to the number and arrangement order of the unit gradient color blocks.

[0131] In embodiment one, since each electric field sensing element includes multiple electric field sensitive elements, the charge conditions of multiple different unit areas in each sensing area can be obtained, and a more detailed charge distribution diagram of the object to be measured is obtained based on the charge conditions of multiple unit areas, thereby more intuitively displaying the charge distribution of the measured area.

[0132] Embodiment 2

[0133] like Figure 3 As shown, this embodiment provides an electrostatic imaging method, wherein the implementation steps of steps S201 to S212 in this embodiment are the same as Figure 2 The implementation steps of step S101 to step S112 in the embodiment 1 recorded in are the same, except that, in this embodiment, step S213 to step S216 are also included.

[0134] S213: Determine whether the unit digital charge signal value is greater than a preset threshold.

[0135] Specifically, according to the order of each unit digital charge signal value obtained in step S203, each unit digital charge signal value is analyzed in the input data analysis model to determine whether each unit digital charge signal value is greater than a preset threshold.

[0136] Furthermore, after obtaining the digital charge signal value of each unit according to the filtering order in the above step S203, the input data analysis model of each unit digital charge signal value is analyzed respectively. If the unit digital charge signal value is greater than the preset threshold, it is determined that the electric field amplitude of the unit area of ​​the object under test corresponding to the unit digital charge signal value and the electric field sensitive element is too high.

[0137] After analyzing the digital charge signal value of each unit and obtaining the corresponding result, the corresponding area of ​​the measured object where the electric field amplitude is too high can be known according to the physical address.

[0138] S214. When the value of the digital charge signal of the determination unit is greater than a preset threshold, a warning instruction is generated.

[0139] After knowing the unit area with too high electric field amplitude and the electric field image in the object under test, compare the physical address of the unit area with too high electric field amplitude in the object under test with the physical address of the dark area in the electric field image. If the physical addresses are the same, it is determined that the acquisition and analysis results are accurate.

[0140] S215 , determining whether a difference between a unit digital charge signal value greater than a preset threshold and an adjacent digital charge signal is greater than a preset difference.

[0141] Specifically, after obtaining a unit digital charge signal value greater than a preset threshold, the unit digital charge signal values ​​of other physical addresses adjacent to the unit digital charge signal value are extracted according to the physical address of the unit digital charge signal value, and the difference between the unit digital charge signal value and other unit digital charge signal values ​​is obtained respectively. Each difference is compared with a preset difference, and if each difference is greater than the preset difference, it is determined that the electric field sensing element corresponding to the unit digital charge signal value is faulty, or each collected analog charge signal is incorrect.

[0142] S216. When it is determined that the electric field sensitive element corresponding to the unit digital charge signal value is faulty, or the collected analog charge signals of each unit are incorrect, a fault instruction is generated. At this time, the state of the incorrect electric field sensing element in the electrostatic sensor, or the state of the electric field sensitive element can be checked, or the object under test can be collected again.

[0143] like Figure 4 As shown, the present invention also provides an electrostatic imaging device for implementing the above-mentioned electrostatic imaging method, comprising:

[0144] The electrostatic sensor 1 includes a plurality of electric field sensing elements 101 and a main control module 102, wherein the plurality of electric field sensing elements 101 are in contact with each other, wherein:

[0145] Each electric field sensing element 101 includes a circuit board and N electric field sensitive elements solidified in the same area of ​​the circuit board, the N electric field sensitive elements face the object to be measured, sense and obtain the unit analog charge signal of each unit area in each sensing area of ​​the object to be measured, wherein N≥2, the number of electric field sensitive elements is the same as the number of unit areas, and the position of each electric field sensitive element corresponds to the position of each unit area;

[0146] The main control module 102 is connected to each electric field sensing element, obtains the unit digital charge signal value corresponding to each unit area in each sensing area, obtains the surface electric field value of the sensitive element corresponding to each electric field sensing element, and saves each unit digital charge signal value and each sensitive element surface electric field value;

[0147] The imaging module 2 is connected to the main control module, and inputs the read digital charge signal value of each unit or the surface electric field value of each sensitive element into the electric field strength-position distribution table, and processes the digital charge signal value of each unit or the surface electric field value of each sensitive element to obtain an electric field image of the object to be measured, wherein the electric field image is divided into color areas corresponding to each unit area, and the color area is also divided into unit color blocks corresponding to each unit area.

[0148] In the imaging device provided by the present invention, since each electric field sensing element includes multiple electric field sensitive elements, the number of sensed charge signals can be increased, and the charge conditions of multiple different unit areas in the measured area can be obtained. After arranging the electric field sensitive elements according to their physical positions, a more detailed electrostatic gradient color block map of the measured object can be accurately obtained, thereby more intuitively displaying the charge distribution of the measured area.

[0149] Embodiment 3

[0150] like Figures 5 to 8 As shown, in this embodiment, the electrostatic imaging device is used to sense the charge signals of each unit area on the surface of the object to be measured. After obtaining the corresponding unit digital charge signal value and unit color block for the charge signal of each area, a charge distribution diagram generated by several unit color blocks is obtained according to the physical position.

[0151] The electrostatic imaging device provided in this embodiment includes an electrostatic sensor 1 and an imaging device 2 connected thereto.

[0152] Specifically, the electrostatic sensor 1 includes a shielding shell 3, a plurality of electric field sensing elements 101 and a main control module 102. The plurality of electric field sensing elements 101 and the main control module 102 are all solidified on the same circuit board. An exposed area and a non-exposed area are formed on the top end surface of the shielding shell 3, and the electric field sensing parts of the plurality of electric field sensing elements 101 are all placed in the exposed area, so that the top end surface of each electric field sensing element 101 faces the outside of the shielding shell 3, and the main control module 102 is located inside the non-exposed area.

[0153] Furthermore, a plurality of electric field sensing elements 101 are arranged in the electrostatic sensor according to their physical addresses, wherein the physical addresses of the electric field sensing elements 101 corresponding to the position in the object to be measured and the electrostatic sensor are the same as the physical address of the sensing area.

[0154] In this embodiment, the plurality of electric field sensing elements 101 are divided into three groups (i.e., the first group, the second group, and the third group), and the three groups of electric field sensing elements 101 are arranged in parallel. Each group includes six electric field sensing elements 101 arranged in parallel (i.e., the first electric field sensing element to the sixth electric field sensing element), wherein the physical address of each electric field sensing element 101 can be selected from the position number, for example: the second electric field sensing element of the first group can be defined as "102", wherein "1" represents the group name (i.e., the first group), and "02" represents the position (i.e., the second electric field sensing element).

[0155] Furthermore, each electric field sensing element 101 includes a plurality of electric field sensitive elements, and each electric field sensitive element is arranged in the corresponding electric field sensing element 101 according to its physical address. Among the electric field sensing elements 101 and the sensing area, the physical address of the electric field sensitive elements corresponding to each other is the same as the physical address of the unit area.

[0156] Furthermore, each electric field sensing element 101 includes a circuit board and two electric field sensitive elements solidified in the same area of ​​the circuit board. The two electric field sensitive elements face the object to be measured, sense and obtain unit analog charge signals of each unit area in each sensing area of ​​the object to be measured.

[0157] In this embodiment, each electric field sensing element 101 includes two electric field sensitive elements, wherein the physical address of each electric field sensitive element can be selected as a position number, for example: the position number of the first electric field sensitive element 1010 is defined as "302a", and the position number of the second electric field sensitive element 1011 is defined as "302b".

[0158] When the electrostatic sensor contacts the object to be measured along the moving axis, the unit analog charge signals of the unit areas on the object to be measured corresponding to the positions of the electric field sensitive elements can be sensed through the electric field sensitive elements, wherein the number of the obtained unit analog charge signals is the same as the number of the electric field sensitive elements and the unit areas.

[0159] Furthermore, the contact between the electrostatic sensor and the object to be measured specifically refers to the electrostatic sensor moving along the movement axis and passing through the upper area of ​​the object to be measured, and the electrostatic sensor and the object to be measured are in contact with each other.

[0160] In this embodiment, preferably, each electric field sensing element may be a MEMS electric field sensing element to sense the charge signal of each unit area on the surface of the object to be measured.

[0161] In two adjacent and abutting electric field sensing elements 101, the distance between two adjacent MEMS electric field sensitive elements is not less than 2.5 cm, so that the two adjacent electric field sensitive elements will not be affected by electromagnetic interference, and there is no need to set an additional insulating layer between the two adjacent electric field sensitive elements. Compared with existing array sensors (for example: CN111289600B, CN106959325B), the processing cost and processing procedures can be reduced.

[0162] In this embodiment, each electric field sensing element 101 implements the specific steps of step S101 recorded in the first embodiment or step S201 recorded in the second embodiment to sense the charge signal in each unit area of ​​the object to be measured to obtain the analog charge signal of each unit.

[0163] In this embodiment, the main control module 102 includes an analog-to-digital conversion module 1021 , a processor 1022 , and a data communication module 1023 .

[0164] Specifically, the analog-to-digital conversion module 1021 is connected to each electric field sensing element 101 and the processor 1022 respectively, and implements the specific steps of step S102 recorded in the above embodiment 1 or step S202 recorded in the above embodiment 2 to convert each unit analog charge signal into each unit digital charge signal value.

[0165] In this embodiment, the number of analog-to-digital conversion modules 1021 is the same as the number of groups of electric field sensing elements 101. Among them, three analog-to-digital conversion modules 1021 are arranged in parallel, and each analog-to-digital conversion module 1021 is electrically connected to a group of electric field sensing elements 101 to receive each unit analog charge signal obtained by each electric field sensitive element in the group of electric field sensing elements 101, and convert it into a corresponding each unit digital charge signal value.

[0166] Among them, when each electric field sensitive element obtains the unit analog charge signal and sends the unit analog charge signal to the analog-to-digital conversion module 1021, its position number (i.e., physical address) is added at the position before the unit analog charge signal or at the position after the unit analog charge signal, so that in subsequent operation steps, its position in the object under test can always be known according to the position number.

[0167] Specifically, the processor 1022 is connected to the analog-to-digital conversion module 1021 and the data communication module 1023, respectively, and the processor 1022 implements the specific steps of steps S103 to S108 recorded in the above-mentioned embodiment 1 or steps S203 to S208 recorded in the above-mentioned embodiment 2, to obtain the unit digital charge signal value corresponding to each unit area in each sensing area, and to obtain the surface electric field value of the sensitive element corresponding to each electric field sensing element 101.

[0168] In this embodiment, the processor 1022 includes:

[0169] A filtering unit, used to filter the digital charge signal value of each unit, eliminate interference signals in each digital charge signal, and obtain the digital charge signal value of each unit;

[0170] A calculation module, used to obtain a sensitivity coefficient corresponding to the value of each unit digital charge signal, and to obtain a surface electric field value of each electric field sensing element 101;

[0171] The memory includes several storage areas for storing the digital charge signal value of each unit according to the physical address of each unit area in each sensing area, and for storing the surface electric field value of each sensitive element according to the physical address of each unit area in the object to be measured.

[0172] Specifically, the data communication module 1023 is electrically connected to the processor 1022, and implements the specific steps of step S109 recorded in the above-mentioned embodiment 1 or step S209 recorded in the above-mentioned embodiment 2, and is used to read and call the digital charge signal value of each unit or the surface electric field value of each sensitive element stored in the processor 1022, and input the digital charge signal value of each unit or the surface electric field value of each sensitive element into the imaging module.

[0173] In addition, in another embodiment, the processor 1022 also includes a data analysis model for implementing the specific steps from step S213 to step S216 described in the above-mentioned second embodiment.

[0174] Specifically, the imaging module is connected to the main control module 102, and the read digital charge signal value of each unit or the surface electric field value of each sensitive element is input into the electric field strength-position distribution table, and the digital charge signal value of each unit or the surface electric field value of each sensitive element is processed to obtain an electric field image of the object under test, wherein the electric field image is divided into color areas corresponding to each unit area, and the color area is also divided into unit color blocks corresponding to each unit area.

[0175] Furthermore, the imaging module includes an electric field strength-position distribution table, and implements specific steps of steps S110 to S112 recorded in the first embodiment or steps S210 to S212 recorded in the second embodiment.

[0176] In one embodiment, the electric field strength-position distribution table includes:

[0177] The analysis module 201 is used to obtain the corresponding unit color block according to the surface electric field value of each sensitive element or the value of each unit digital charge signal.

[0178] The pattern generation module 202 is used to perform gradient processing on each unit color block to form each unit gradient color block. The pattern generation module includes a division unit and a gradient pattern color block unit, wherein:

[0179] The dividing unit is used to divide the unit color block into N unit color blocks, and to divide at least one matching color block into N' unit matching color blocks, wherein N≥2, and N'=N.

[0180] The gradient pattern color block unit is used to sequentially superimpose and merge N unit color blocks with N' unit gradient color blocks to form a unit gradient color block.

[0181] The electric field image template 203 is used to receive each unit color block and place the unit color block at a designated position in the electric field image template according to the physical address.

[0182] The pattern synthesis module 204 is used to synthesize the unit color blocks in the electric field image template to form an electric field image corresponding to the charge distribution of the object to be measured.

[0183] In this embodiment, the generated charge distribution map is an electrostatic gradient color block map.

[0184] The above description is only a preferred embodiment of the present invention, which is only illustrative and not restrictive of the present invention. Those skilled in the art understand that many changes, modifications, and even equivalences may be made to the present invention within the spirit and scope defined by the claims of the present invention, but all of them will fall within the scope of protection of the present invention.

Claims

1. An electrostatic imaging method, characterized in that: The following steps are involved: Each electric field sensitive element in the electrostatic sensor senses the charge signal in each unit area of ​​the measured object to obtain the analog charge signal of each unit; After obtaining the digital charge signal value of each unit according to the analog charge signal of each unit, the digital charge signal value is stored in the corresponding storage area; After obtaining the surface electric field value of each electric field sensitive element according to each unit digital charge signal value, the value is stored in a corresponding storage area; According to the physical address, the digital charge signal value of each unit or the surface electric field value of each sensitive element is input into the electric field strength-position distribution table to obtain the electric field image of the object under test, wherein the electric field image is divided into unit gradient color blocks corresponding to each unit area.

2. The electrostatic imaging method according to claim 1, characterized in that: The electrostatic sensor includes a plurality of electric field sensing elements and a main control module, wherein the plurality of electric field sensing elements are in contact with each other, wherein: Each of the electric field sensing elements includes a circuit board and N electric field sensitive elements solidified in the same area of ​​the circuit board, the N electric field sensitive elements face the object to be measured, sense and obtain the unit analog charge signal of each unit area in each sensing area of ​​the object to be measured, wherein N≥2, the number of the electric field sensitive elements is the same as the number of the unit areas, and the position of each electric field sensitive element corresponds to the position of each unit area.

3. The electrostatic imaging method according to claim 1, characterized in that: After obtaining the digital charge signal value of each unit according to the analog charge signal of each unit, saving it in a corresponding storage area includes: Converting each of the unit analog charge signals into a corresponding each of the unit digital charge signals; Filtering each of the unit digital charge signal values ​​to eliminate interference signals in each of the unit digital charge signals to obtain each of the unit digital charge signal values; According to the physical address of each electric field sensitive element, the corresponding unit digital charge signal value is stored in a storage area corresponding to the physical address in the memory.

4. The electrostatic imaging method according to claim 1, characterized in that: After obtaining the surface electric field value of each electric field sensitive element according to each unit digital charge signal value, storing it in a corresponding storage area includes: Calibrate the electrostatic sensor to obtain a sensor surface electric field value of the electrostatic sensor; Obtaining a sensitivity coefficient corresponding to a current value of the unit digital charge signal according to the sensor surface electric field value and each of the unit digital charge signal values; Obtaining the surface electric field value of the sensitive element of each electric field sensing element according to the corresponding digital charge signal value and the sensitivity coefficient; According to the physical address of each electric field sensing element in the electrostatic sensor, the surface electric field value of the corresponding sensitive element is stored in a storage area corresponding to the physical address in the memory.

5. The electrostatic imaging method according to claim 1, characterized in that: In the step of inputting the digital charge signal value of each unit or the surface electric field value of each sensitive element into the electric field strength-position distribution table according to the physical address to obtain the electric field image of the object under test, the method includes: In the electric field strength-position distribution table, a corresponding unit color block is obtained according to the surface electric field value of each of the sensitive elements or the value of each of the unit digital charge signals; The unit color blocks are sequentially placed at designated positions in the electric field image template according to the physical addresses to form an electric field image corresponding to the charge distribution of the object under test.

6. The electrostatic imaging method according to claim 5, characterized in that: The unit gradient color block is obtained by subjecting the unit color block to a gradient process, or by subjecting the unit color block and a matching color block to a gradient process.

7. An electrostatic imaging device, characterized in that: A method for implementing an electrostatic imaging method according to any one of claims 1 to 6, comprising: The electrostatic sensor comprises a plurality of electric field sensing elements and a main control module, wherein the plurality of electric field sensing elements are in contact with each other, wherein: Each of the electric field sensing elements includes a circuit board, and N electric field sensitive elements solidified in the same area of ​​the circuit board, the N electric field sensitive elements face the object to be measured, sense and obtain the unit analog charge signal of each unit area in each sensing area of ​​the object to be measured, wherein N≥2, the number of the electric field sensitive elements is the same as the number of the unit areas, and the position of each electric field sensitive element corresponds to the position of each unit area; The main control module is connected to each of the electric field sensing elements, obtains the unit digital charge signal value corresponding to each of the unit areas in each of the sensing areas, obtains the surface electric field value of the sensitive element corresponding to each of the electric field sensing elements, and saves each of the unit digital charge signal value and each of the surface electric field value of the sensitive element; An imaging module is connected to the main control module, inputs the read digital charge signal values ​​of each unit or the surface electric field values ​​of each sensitive element into an electric field strength-position distribution table, processes the digital charge signal values ​​of each unit or the surface electric field values ​​of each sensitive element to obtain an electric field image of the object under test, wherein the electric field image is divided into unit gradient color blocks corresponding to each unit area.

8. The electrostatic imaging device according to claim 7, characterized in that The main control module includes an analog-to-digital conversion module, a processor and a data communication module, wherein: The analog-to-digital conversion module is connected to each of the electric field sensing elements and the processor, respectively, and is used to convert each of the unit analog charge signals into each unit digital charge signal value; The processor is connected to the analog-to-digital conversion module and the data communication module respectively, and obtains the unit digital charge signal value corresponding to each unit area in each sensing area, and obtains the surface electric field value of the sensitive element corresponding to each electric field sensing element; The data communication module is used to read and call the digital charge signal value of each unit or the surface electric field value of each sensitive element stored in the processor, and input the digital charge signal value of each unit or the surface electric field value of each sensitive element into the imaging module.

9. The electrostatic imaging device according to claim 8, characterized in that The processor includes: A filtering unit, used for filtering each of the unit digital charge signal values ​​to eliminate interference signals in each of the digital charge signals to obtain each of the unit digital charge signal values; A calculation module, used to obtain a sensitivity coefficient corresponding to each of the unit digital charge signal values, and to obtain a surface electric field value of a sensitive element of each of the electric field sensing elements; The memory includes a plurality of storage areas for storing the digital charge signal value of each unit according to the physical address of each unit area in each sensing area, and for storing the surface electric field value of each sensitive element according to the physical address of each unit area in the object to be measured.

10. The electrostatic imaging device according to claim 8, characterized in that The electric field strength-position distribution table includes: An analysis module, used for obtaining a corresponding unit color block according to the surface electric field value of each of the sensitive elements or the value of each of the unit digital charge signals; An electric field image template, used for receiving each of the unit color blocks and placing the unit color blocks at designated positions in the electric field image template according to physical addresses; A pattern generation module, used for performing gradient processing on each of the unit color blocks, or the unit color blocks and the matching color blocks, to form each unit gradient color block; The pattern synthesis module is used to synthesize each of the unit gradient color blocks in the electric field image template to form an electric field image corresponding to the charge distribution of the object to be measured.

Images