Electric heating wire detection method and detection system for electric heating glass

Abstract

The invention provides an electric heating wire detection method and system for electric heating glass. The detection method comprises the following steps: electrifying and heating the electric heating wire of the electric heating glass for preset time; obtaining a thermal imaging image of the heating wire, wherein the thermal imaging image comprises a plurality of detection areas; and judging whether the heating wire has defects or not based on whether the temperature difference between two adjacent detection areas of the heating wire in the thermal imaging image exceeds a set threshold value or not. Whether the electric heating wire of the electric heating glass has the defect or not is judged by utilizing the temperature difference of the two adjacent detection areas of the electric heating wire in the thermal imaging image, automatic detection can be realized, the detection efficiency is high, the detection result is accurate and reliable, and a bad product with the defect of the electric heating wire can be prevented from being put into use.

Description

Technical Field

[0001] The present disclosure relates to the field of temperature measurement and detection technology, and more specifically, to a heating wire detection method and detection system for electrically heated glass, a computer device for implementing the detection method, and a computer-readable storage medium for executing the detection method. Background Art

[0002] Electric heated glass is a kind of glass with self-heating function. Usually, a resistance layer composed of metal heating wire is sandwiched between two layers of glass. When the power is turned on, the resistance layer will generate heat to heat the glass. This kind of glass can control the degree and temperature of heating by adjusting the current. It is widely used in windows for vehicles and doors and windows in cold areas. It is also called anti-fog glass or temperature-controlled glass. For example, in a cold environment, the surface of the glass may be frosted or fogged, affecting the field of vision. With electric heated glass, the resistance layer in the glass can be energized to heat up to prevent frost and fog, and maintain a good field of vision.

[0003] Since the heating wire may be damaged or disconnected during production and transportation, it may not be able to heat when it is put into use or the heating may fail after a period of use. Therefore, it is necessary to detect the heating wire of the electrically heated glass. The existing detection methods are usually manual detection or detection by offline equipment. During manual detection, the inspector uses a portable device to visually observe whether the heating wire is disconnected after the heating wire is powered on. During offline equipment detection, an infrared camera is used to take a thermal imaging image after the heating wire is powered on, and whether it is disconnected is determined by observing the thermal imaging image. The existing method consumes a lot of manpower and material resources, and is time-consuming. In addition, some errors introduced by the inspectors and offline equipment may make it impossible to accurately detect the defects of the heating wire. For example, in the case where the heating wire is only damaged but not disconnected, the existing method cannot accurately detect the damaged part, and the heating will fail once the glass is put into use for a period of time. Summary of the invention

[0004] The purpose of the present disclosure is to provide a method and system for detecting heating wires of electrically heated glass, so as to improve the accuracy and efficiency of detection results in a cost-effective and reliable manner.

[0005] To this end, the present disclosure provides a method for detecting a heating wire of an electrically heated glass, the method comprising the following steps: energizing and heating the heating wire of the electrically heated glass for a predetermined time; acquiring a thermal imaging image of the heating wire, the thermal imaging image comprising a plurality of detection areas; and judging whether the heating wire has a defect based on whether a temperature difference between two adjacent detection areas of the heating wire in the thermal imaging image exceeds a set threshold.

[0006] According to the above technical concept, the embodiments of the present disclosure may further include any one or more of the following optional forms.

[0007] In some optional forms, in the step of acquiring the thermal imaging image of the heating wire, the thermal imaging image is acquired by a long-wave infrared thermal imaging camera, and each detection area corresponds to a single pixel point of the image of the long-wave infrared thermal imaging camera.

[0008] In some optional forms, the size of a single pixel of the image is 0.5 mm to 5 mm, and the size of each detection area corresponds to the size of a single pixel of the image.

[0009] In some optional forms, in the step of judging whether the heating wire is defective based on whether the temperature difference between two adjacent detection areas of the heating wire in the thermal imaging image exceeds a set threshold: when the temperature difference is greater than or equal to 1°C, it is judged that the heating wire is defective.

[0010] In certain optional forms, in the step of energizing and heating the heating wire of the electrically heated glass for a predetermined time, the predetermined time is 10 seconds to 20 seconds.

[0011] In some optional forms, the method further includes: after determining that the heating wire has a defect, determining the defective position of the heating wire based on the positions of two adjacent detection areas where the temperature difference exceeds the set threshold.

[0012] In some optional forms, the method further includes: generating an error alarm signal after determining that the heating wire is defective.

[0013] In certain optional forms, the false alarm signal is displayed via the thermal imaging image and / or via an alarm.

[0014] In some optional forms, before the step of energizing and heating the heating wire of the electrically heated glass for a predetermined time, the method also includes: using an anti-error sample for calibration; the calibration includes: energizing and heating the heating wire of the anti-error sample for a predetermined time, obtaining a thermal imaging image of the heating wire, and comparing the thermal imaging image with a reference image of the anti-error sample, if the consistency meets the predetermined conditions, performing the detection, if not, ending the detection.

[0015] In some optional forms, the method further comprises: transporting the electrically heated glass to an inspection position on a production line before the inspection; and transporting the electrically heated glass out of the inspection position after the inspection.

[0016] According to another aspect of the present disclosure, a heating wire detection system for electrically heated glass is provided, the system comprising: a support module, the support module being configured to support and position the electrically heated glass; a heating module, the heating module being configured to heat the heating wire; a thermal imaging module, the thermal imaging module being configured to obtain a thermal imaging image of the heating wire after the heating wire is heated, the thermal imaging image comprising a plurality of detection areas; and a judgment module, the judgment module being configured to judge whether the heating wire has a defect based on whether a temperature difference between two adjacent detection areas of the heating wire in the thermal imaging image obtained by the thermal imaging module exceeds a set threshold value after the heating module has heated for a predetermined time.

[0017] In certain optional forms, the thermal imaging module includes a long wave infrared thermal imaging camera.

[0018] In some optional forms, the size of a single pixel of the image of the long-wave infrared thermal imaging camera is 0.5 mm to 5 mm, and the size of a single pixel of the image corresponds to the size of each detection area.

[0019] In some optional forms, the set threshold is 1° C., and the judgment module is configured to judge that the heating wire is defective based on the temperature difference exceeding the set threshold.

[0020] In some optional forms, the predetermined time is 10s to 20s.

[0021] In some optional forms, the heating module includes a power supply unit for heating the heating wire and a buffer unit connected between the power supply unit and the heating wire, and the buffer unit is made of a flexible material.

[0022] In some optional forms, the system further comprises a constant power supply configured to drive the heating module, the thermal imaging module and the determination module.

[0023] In some optional forms, the system further includes a transport module connected to the support module and configured to transport the electrically heated glass to the support module and transport the electrically heated glass out of the support module.

[0024] In some optional forms, the system further comprises an alarm module, wherein the alarm module is configured to issue an error alarm signal in response to the determination module determining that the heating wire is defective.

[0025] In certain optional forms, the system further comprises a display module configured to display the thermal imaging image.

[0026] In some optional forms, the system further includes a calibration module, the calibration module including an error-proofing sample and configured to perform calibration using the heating module and the thermal imaging module.

[0027] According to another aspect of the present disclosure, a computer device is provided, comprising a memory, a processor, and instructions stored in the memory and executable by the processor, wherein the processor implements the above-mentioned heating wire detection method for electrically heated glass when executing the instructions.

[0028] According to another aspect of the present disclosure, a computer-readable storage medium is provided, wherein the computer-readable storage medium has computer-executable instructions stored thereon, and the computer-executable instructions are used to execute the above-mentioned heating wire detection method for electrically heated glass.

[0029] The present invention utilizes the temperature difference between two adjacent detection areas of the heating wire in the thermal imaging image to determine whether the heating wire of the electrically heated glass has defects, thereby realizing automatic detection with high detection efficiency and accurate and reliable detection results, and preventing missed detection and false detection, thereby avoiding putting defective products with heating wire defects into use. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Other features and advantages of the present disclosure will be better understood through the following optional embodiments described in detail in conjunction with the accompanying drawings, in which:

[0031] Figure 1 is a schematic flow chart of a method for detecting a heating wire of an electrically heated glass according to an embodiment of the present disclosure;

[0032] Figure 2 is a schematic flow chart of a method for detecting a heating wire of an electrically heated glass according to another embodiment of the present disclosure;

[0033] Figure 3 is a schematic diagram of the principle of the heating wire detection method of the electrically heated glass according to the present disclosure;

[0034] Figure 4 is a schematic block diagram of a heating wire detection system for electrically heated glass according to an embodiment of the present disclosure;

[0035] Figure 5 is a schematic diagram of a heating wire detection system for electrically heated glass according to an embodiment of the present disclosure;

[0036] Figure 6 It is a schematic diagram showing the disconnection of the heating wire through a thermal imaging image;

[0037] Figure 7 It is a schematic diagram showing the hot spots of the heating wire through a thermal imaging image;

[0038] Figure 8 is a schematic diagram of a computer device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0039] The implementation and use of the embodiments are discussed in detail below. However, it should be understood that the specific embodiments discussed are merely illustrative of specific ways to implement and use the present disclosure, and are not intended to limit the scope of the present disclosure.

[0040] The flowcharts and block diagrams in the accompanying drawings illustrate the possible implementation architecture, functions and operations of the methods and systems according to the various embodiments of the present disclosure. It should be understood that the functions marked in the boxes may also occur in an order different from that marked in the accompanying drawings. For example, two boxes represented in succession may actually be executed substantially in parallel, or they may sometimes be executed in the opposite order, depending on the functions involved. It should be understood that the steps included in the method of the present disclosure are not necessarily executed one by one in the order of the various embodiments of the present disclosure, and those skilled in the art may adjust the order of step execution according to actual needs. And according to different needs, those skilled in the art may cause one or more of the steps to be repeated.

[0041] In this document, unless otherwise specifically defined, the terms "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in this document can be understood according to the specific circumstances.

[0042] As a daily necessity in people's lives, electrically heated glass with heating function is often used in fields such as construction or transportation. For example, when applied to car window glass, electrically heated glass can be used for front windshield, rear windshield, door glass, etc. For manufacturers or users, whether the heating wire of the electrically heated glass has defects is the key to evaluating the performance of the electrically heated glass. It has been recognized that the existing detection methods for defects in the heating wire consume manpower and material resources, are time-consuming, and the detection cost is too high. Moreover, the existing methods can usually only detect broken wires. The inventors found that when the heating wire has defects such as wear, scratches, or jagged notches, the heating wire is not broken, so it is difficult to detect it when using the existing method. However, after the electrically heated glass is put into use for a period of time, the wire will be broken, resulting in missed detection and false detection, and the detection accuracy is not high.

[0043] According to the concept of the present disclosure, a method for detecting a heating wire of electrically heated glass is provided, and the method can be performed by a heating wire detection system of electrically heated glass. Figure 1 As shown, the method includes:

[0044] S1, energizing the heating wire of the electrically heated glass for a predetermined time;

[0045] S2, obtaining a thermal imaging image of the heating wire, wherein the thermal imaging image includes a plurality of detection areas;

[0046] S3, judging whether the heating wire has a defect based on whether the temperature difference between two adjacent detection areas of the heating wire in the thermal imaging image exceeds a set threshold.

[0047] It should be understood that the temperature difference between the two adjacent detection areas is for a single heating wire. Based on Joule's law: Q=I2RT, the heat Q generated by the current I passing through the conductor is proportional to the square of the current I, proportional to the resistance R of the conductor, and proportional to the power-on time T. In this way, when the heating wire is energized and heated, the current passing through the defective position of the heating wire will increase the resistance and temperature due to the reduction of the cross-sectional damage of the heating wire, so that the change in the temperature difference of the adjacent detection areas of a certain heating wire can be used to determine whether the heating wire has a defect, and the defect position can be further determined optionally. By dividing the acquired thermal imaging image of the heating wire into multiple detection areas, judging whether the heating wire has a defect based on the temperature difference between the two adjacent detection areas, and optionally further determining the defect position, the present disclosure can realize automatic detection, with high detection efficiency and accurate and reliable detection results, without missed detection or false detection. Advantageously, when the detection method of the present disclosure is applied to the production line, online automatic detection can be realized and the detection results can be obtained in real time, which is helpful to realize automated detection and transportation and improve production efficiency. According to different needs, one or more of the above steps can be repeated. For example, for multiple heating wires, after heating (S1) is performed and a thermal imaging image is obtained (S2), and after judging whether the heating wire has a defect based on whether the temperature difference between two adjacent detection areas of the heating wire in the thermal imaging image exceeds a set threshold (S3), all steps S1 to S3 can be repeated to verify the defect, and after confirming the existence of the defect, S1 to S3 can be repeated for a single or multiple heating wires with a defect, or S3 can be repeated, or S2 and S3 can be repeated, so as to determine the defect of the heating wire through multiple detection areas of the thermal imaging image. Similarly, for a single heating wire, after judging whether the single heating wire has a defect by executing S1 to S3, S3 can be repeated, or S2 and S3 can be repeated, so as to determine the defect of the heating wire by judging the temperature difference of multiple detection areas.

[0048] Combination Figure 3As shown, multiple detection areas P included in the thermal imaging image and two adjacently arranged heating wires L1 and L2 are schematically shown. When the temperature difference ΔT between the two adjacent detection areas P1 and P2 and between P2 and P3 of the heating wire L1 is detected to have a large change with the temperature difference between the other detection areas of the heating wire L1, it can be determined that a defect occurs in the detection area P2. This defect is different from a broken wire. It is a significant bright spot generated on the thermal imaging image due to the increase in temperature, which can also be called a hot spot HP. The heating wire that detects the hot spot has the risk of breaking after being used for a period of time, while conventional detection methods can only detect it after the break. Therefore, the detection method disclosed in the present invention can accurately detect almost any heating wire defect that may cause a break, including but not limited to printing defects, wear, scratches, indentations, cracks, notches, etc. of the heating wire.

[0049] Advantageously, in S2 of the detection method, the thermal imaging image is obtained by a long-wave infrared (LWIR) thermal imaging camera, wherein each detection area corresponds to a single pixel of the image of the long-wave infrared thermal imaging camera. That is, each detection area and a single pixel of the image are mapped to each other in the image, specifically, the position and size of each detection area correspond to the position and size of a single pixel. In this article, the size of a single pixel of an image refers to the size of a single pixel in a thermal imaging image that can be generated by a long-wave infrared thermal imaging camera. The wavelength range of long-wave infrared is generally 7.5 μm to 14 μm. For the heat radiated by an object within this wavelength range, a long-wave infrared thermal imaging camera can accurately capture the heat radiation and detect the temperature difference, and then convert it into a visible image, thereby providing an accurate and visible detection result. The smaller the size of a single pixel of the image, the higher the detection accuracy, and there may be too many defects and cause a detection burden. The larger the size of a single pixel of the image, the lower the detection accuracy, and missed detection may occur. Depending on the required detection accuracy, the size of a single pixel of the image may be 0.5 mm to 5 mm, preferably 1 mm to 2.5 mm, for example, 1 mm, 1.5 mm, 2 mm, 2.5 mm, etc.

[0050] Advantageously, in S3 of the detection method, when the temperature difference exceeds the set threshold, it is judged that the heating wire has a defect, wherein the set threshold is 1°C, preferably 1.5°C, that is, when the temperature difference is greater than or equal to 1°C, it can be judged that the heating wire has a defect. Usually, the material used for the heating wire is tungsten wire or silver wire. For heating wires of different materials, a suitable set threshold can be selected according to different material properties. For example, for silver wire, it can be selected as 2.5°C, 2.7°C, 3°C, etc. The smaller the set threshold of the temperature difference is set, the higher the detection accuracy is, and there may be too many defects and cause detection burden. The larger the set threshold is set, the lower the detection accuracy is, and missed detection may occur. Depending on the required detection accuracy, it is more reasonable to set the set threshold to the above value. When a wire break occurs, the temperature difference of the adjacent detection areas of the heating wire is larger, but it still meets the judgment condition that the temperature difference exceeds the set threshold of the present disclosure. In other words, the detection method of the present disclosure is not only applicable to the detection of heating wires with minor defects, but also to the detection of heating wires with broken wires.

[0051] Advantageously, in S1 of the detection method, the predetermined time for power-on heating is 10s to 20s, preferably 10s to 15s. If the heating time is too short, the electric heating wire on the electrically heated glass may not be fully heated, resulting in inaccurate detection results. If the heating time is too long, the temperature will be transmitted to the glass, making the temperature difference unclear, and the thermal imaging image will be unclear, which will still lead to inaccurate detection results. Depending on the required detection accuracy, it is more reasonable to set the predetermined heating time to the above range. For example, for silver wires, 10s, 15s, etc. can be selected.

[0052] In some embodiments, the detection method further includes S4, after determining that the heating wire has a defect, determining the defect position of the heating wire based on the positions of two adjacent detection areas where the temperature difference exceeds the set threshold, thereby facilitating the detection personnel to remedy certain heating wire defects. Further optionally or additionally, the detection method further includes S5, after determining that the heating wire has a defect, generating an error alarm signal. Figure 2 An exemplary implementation is shown, that is, after executing S3 to determine whether the heating wire has a defect, executing S4 to determine the defect location of the heating wire, and then executing S5 to generate an error alarm signal. In this way, the error alarm signal may include a defect alarm and a defect location alarm. Depending on different needs, the steps illustrated are not necessarily Figure 2 The sequence shown is performed one by one. For example, in some embodiments, the detection can be terminated after S3 and S4 are executed. In this case, for example, the defect location can be displayed by a thermal imaging image. In some embodiments, after S3 is executed, S5 is executed and the detection is terminated. In this case, the error alarm signal may include a defect alarm. In some embodiments, the error alarm signal may be displayed by a thermal imaging image and / or by an alarm.

[0053] In certain embodiments, Figure 2 As illustrated, before S1, the detection method also includes S0, using the error-proofing sample for calibration. Specifically, the calibration includes: heating the heating wire of the error-proofing sample for a predetermined time, obtaining a thermal imaging image of the heating wire, and comparing the thermal imaging image with the reference image of the error-proofing sample. If the consistency meets the predetermined conditions, the detection is implemented (that is, at least S1 to S3 are executed), and if not, the detection is terminated. Here, the predetermined condition can be set to that the thermal imaging image and the reference image of the error-proofing sample meet a certain proportion of similarity, for example, the similarity is greater than or equal to 80% or greater than or equal to 90% or the similarity is 100%. Taking the similarity greater than or equal to 80% as an example, if the similarity is greater than or equal to 80%, the judgment condition that the consistency meets the predetermined condition is met and the detection is implemented. If the similarity is less than 80%, the judgment condition that it does not meet the predetermined condition is met and the detection is terminated.

[0054] In certain embodiments, the detection method further comprises: transporting the electrically heated glass to a detection position on the production line before detection; and transporting the electrically heated glass out of the detection position after detection. In this way, the detection method disclosed in the present invention can be applied to the production line to realize online automatic detection of the electrically heated glass, and can provide automatic transportation of the electrically heated glass, thereby improving production efficiency.

[0055] Based on the above concept, the present disclosure also provides a heating wire detection system for electrically heated glass, and the system can execute a heating wire detection method for electrically heated glass. Figure 4 As shown, the system includes: a support module 110, a heating module 120, a thermal imaging module 130 and a judgment module 140. The support module 110 is configured to support and position the electrically heated glass, and the heating module 120 is configured to heat the heating wire, for example, to perform Figure 1 In S1 of the detection method shown in the figure, the thermal imaging module 130 is configured to obtain a thermal imaging image of the heating wire after the heating wire is heated, for example, by performing Figure 1 In S2 of the detection method shown in the figure, the thermal imaging image also includes multiple detection areas. The judgment module 140 is configured to judge whether the heating wire has a defect based on whether the temperature difference between two adjacent detection areas of the heating wire in the thermal imaging image obtained by the thermal imaging module 130 exceeds a set threshold after the heating module 120 heats for a predetermined time, for example, Figure 1 S3 of the detection method shown.

[0056] Figure 5A layout of a detection system is exemplarily shown, and the support module 110 can be constructed as a support frame, on which, for example, a placement position for placing the electrically heated glass 100 to be detected is provided, wherein a plurality of parallelly arranged electric heating wires L are shown on the electrically heated glass 100. Optionally, the support module 110 is provided with a placement position for placing a heating module 120, a thermal imaging module 130, a judgment module 140 and other optional modules. It should be understood that the heating module 120, the thermal imaging module 130, the judgment module 140 and other optional modules can also be arranged on other support structures or on independent support structures. In certain embodiments, the support module 110 includes a limiting unit 111 for limiting the electrically heated glass 100 to a placement position, Figure 5 exemplarily shows a plurality of position limiting units 111 arranged around the electrically heated glass 100. It should be understood that any structure that can be used to limit the placement position of the electrically heated glass belongs to the position limiting unit, and is not limited here. Figure 4 and Figure 5 As shown, the system further includes a transport module 180, which is connected to the support module 110 and configured to transport the electrically heated glass 100 to be inspected to the support module 110 before inspection, and to transport the inspected electrically heated glass 100 out of the support module 110 after inspection, for example, to transport the inspected electrically heated glass without defects to a storage location or a transport location, or to transport the inspected electrically heated glass with defects to a processing location for processing the defects. When the inspection system executes Figure 1 or Figure 2 When the detection method is shown, it should be understood that before the detection, the detection system performs the following Figure 1 or Figure 2 Before S1 of the detection method shown, after the detection, the detection system performs the following Figure 1 After S3 of the detection method shown, or the detection system performs the following Figure 2 After S4 or S5 of the detection method shown, depending on different needs, the transport module 180 can transport the electrically heated glass 100 after the detection is completed from the support module 110 after different detection stages. Advantageously, the transport module 180 can be configured as Figure 5 The conveyor belt shown realizes the automatic conveyance of the electrically heated glass 100. Therefore, the detection system disclosed in the present invention can be applied to a production line, providing online automatic detection and automatic transportation of electrically heated glass, reducing manual labor intensity, and improving production efficiency.

[0057] As described above, the heating module 120 is configured to heat the electric heating wire for a predetermined time, advantageously, the predetermined time is 10s to 20s, preferably 10s to 15s. In some embodiments, the heating module 120 includes a power supply unit for heating the electric heating wire and a buffer unit connected between the power supply unit and the electric heating wire, wherein the buffer unit is made of a flexible material, such as a resin or rubber material. Alternatively, materials such as EPDM, polyurethane (PU) or high-density polyethylene (HDPE) can be selected. The use of the buffer unit can prevent the joint of the power supply unit from directly contacting the glass and damaging the glass, while ensuring that the power supply unit is in good contact with the electric heating wire to achieve power supply. In this way, when the electrically heated glass cannot be in good contact with the power supply unit due to dimensional tolerance, improper placement, deadweight, etc., the buffer unit can play a certain supporting role and contact role and prevent the glass from being damaged, and can also adapt to glass of different geometric shapes. Optionally, the buffer unit can be disassembled and replaced after a period of use to ensure support and effective protection of the glass.

[0058] In some embodiments, the thermal imaging module 130 in the detection system includes a long-wave infrared thermal imaging camera. As described in the above description of the detection method, the long-wave infrared thermal imaging camera can accurately capture thermal radiation and detect temperature differences, and then convert them into visible images, thereby providing accurate and visible detection results. Depending on the required detection accuracy, the size of a single pixel point of the image of the long-wave infrared thermal imaging camera can be 0.5 mm to 5 mm, preferably 1 mm to 2.5 mm, and the size of a single pixel point of the image corresponds to the size of each detection area in the thermal imaging image.

[0059] In some embodiments, the determination module 140 in the detection system is configured to determine whether the heating wire is defective based on whether the temperature difference exceeds a set threshold, wherein the set threshold is 1°C, preferably 1.5°C.

[0060] In certain embodiments, Figure 4 and Figure 5 As shown, the detection system may further include an alarm module 150, which is configured to send an error alarm signal in response to the judgment module 140 judging that the heating wire has a defect. The alarm module is, for example, an alarm, which can alarm in real time through color changes and / or sounds, so that the inspection personnel can remove the defective products with heating wire defects from the support module 110 or the production line for processing.

[0061] In certain embodiments, Figure 4 and Figure 5 As shown, the detection system further includes a display module 160, which is configured to display the thermal imaging image and further optionally or additionally display the defect position of the heating wire (for example, the detection system performs Figure 2After S4 of the above detection method shown in FIG. 1 ), and further optionally or additionally displaying an error alarm signal (for example, the detection system executes Figure 2 The display module 160 is, for example, a display or a screen, and can be configured to display the thermal imaging image from the thermal imaging module 130 and / or the error alarm signal from the alarm module 150 on the display screen for intuitive viewing. Figure 6 and Figure 7 The detection results that can be visually viewed on the display screen are shown as examples. Figure 6 If a heating wire L among the multiple parallel heating wires is detected to have a broken wire defect, the defect position can be displayed on the display screen through an alarm mark AL. Similarly, when a heating wire L is detected to have a hot spot HP defect, the defect position is displayed through an alarm mark AL, such as Figure 7 In this way, the inspector can clearly know the defect location for further processing.

[0062] In some embodiments, the detection system further includes a calibration module 170, for example, the detection system performs Figure 2 In S0 of the detection method shown, the calibration module 170 includes an error-proofing sample and is configured to implement calibration through the heating module 120 and the thermal imaging module 130. The error-proofing sample can be constructed to include an electrically heated glass with a defective heating wire and an electrically heated glass without a defective heating wire. By respectively implementing power-on heating and acquiring thermal imaging images, images of normal heating wires and images of defective heating wires are obtained. By comparing them with the reference image, it can be known whether the detection system maintains a good working state, thereby ensuring the detection capability of the system. Advantageously, the calibration can be implemented as a periodic calibration, and the periodic calibration can be set according to actual needs, such as 3 days, 5 days, or longer or shorter.

[0063] In some embodiments, the detection system may further include an additional constant power supply 190, which is configured to drive the heating module 120, the thermal imaging module 130 and the judgment module 140, as well as other optional modules. The constant power supply can provide stable power to meet the requirements of current or voltage, etc., to ensure the normal operation of each module in the detection system. It should be understood that the various modules in the detection system can be linked to each other through the control module and operate in coordination. The control module can be configured as an independent module to coordinately control each module, or each module can be configured with its own control module.

[0064] From the above description, it can be seen that the detection system disclosed in the present invention determines the defective position of the heating wire based on the temperature difference between two adjacent detection areas of the heating wire, thereby improving the detection accuracy and shortening the detection time, and improving the detection efficiency at a significantly reduced cost, which can avoid putting defective products with heating wire defects into use. In addition, the detection system disclosed in the present invention has a simple structure, has the advantages of high detection accuracy and stable performance, and is cost-effective.

[0065] Combination Figure 8 As shown, the present disclosure also provides a computer device 200, which may include a memory 210 and a processor 220. Instructions 211 may be stored in the memory 210, and the instructions 211 may be executed by the processor 220, wherein the processor 220 implements the detection method according to the above embodiment when executing the instructions 211.

[0066] In some embodiments, the computer device 200 may be a device such as a notebook, a desktop computer, and a cloud server. It is understood that the components included in the computer device 200 are not limited to the memory 210 and the processor 220, and may vary depending on different needs. Exemplarily, the computer device 200 may also include a plurality of components connected to its input / output interface, including but not limited to: an input unit, such as a keyboard, a mouse, etc.; an output unit, such as a display, a speaker, etc.; a storage unit, such as a semiconductor storage device, a magnetic surface storage device, an optical storage device, etc.; and a communication unit, such as a network card, a wireless communication transceiver, etc.

[0067] In some embodiments, the memory 210 may include, for example, a random access memory (RAM) or a read-only memory (ROM). The memory 210 may be used to store instructions, programs, codes, and other programs and data required by the computer device 200, but is not limited thereto.

[0068] In addition, the processor 220 can be a central processing unit (CPU) or other general-purpose processors, such as a digital signal processing (DSP), a field programmable gate array (FPGA), a programmable logic array (PLA), etc.

[0069] In certain embodiments, the present disclosure further provides a computer-readable storage medium having computer-executable instructions stored thereon, wherein the computer-executable instructions are used to execute the detection method according to the above embodiments.

[0070] Alternatively, the computer-readable storage medium may be a ROM, a RAM, a semiconductor storage device, a magnetic surface storage device, an optical storage device, and the like.

[0071] It should be understood that the embodiments shown in the figure only show an exemplary process of the electric heating wire detection method for electrically heated glass according to the present disclosure, and an exemplary optional block diagram of various optional components of the detection system, but it is only for illustration and not limitation, and other methods may also be adopted without departing from the idea and scope of the present disclosure.

[0072] The technical content and technical features of the present disclosure have been disclosed above. However, it can be understood that under the creative ideas of the present disclosure, technicians in this field can make various changes and improvements to the above disclosed concepts, but they all belong to the protection scope of the present disclosure. The description of the above implementation mode is illustrative rather than restrictive, and the protection scope of the present disclosure is determined by the claims.

Claims

1. A method for detecting a heating wire of an electrically heated glass, characterized in that: The method comprises the following steps: The electric heating wire of the electric heating glass is energized and heated for a predetermined time; Acquire a thermal imaging image of the heating wire, wherein the thermal imaging image includes a plurality of detection areas; Whether the heating wire has a defect is determined based on whether the temperature difference between two adjacent detection areas of the heating wire in the thermal imaging image exceeds a set threshold.

2. The method for detecting the heating wire of electrically heated glass according to claim 1, characterized in that: In the step of acquiring the thermal imaging image of the heating wire, the thermal imaging image is acquired by a long-wave infrared thermal imaging camera, and each detection area corresponds to a single pixel point of the image of the long-wave infrared thermal imaging camera.

3. The method for detecting the heating wire of electrically heated glass according to claim 2, characterized in that: The size of a single pixel of the image is 0.5 mm to 5 mm, and the size of each detection area corresponds to the size of a single pixel of the image.

4. The method for detecting the heating wire of electrically heated glass according to claim 1, characterized in that: In the step of judging whether the heating wire is defective based on whether the temperature difference between two adjacent detection areas of the heating wire in the thermal imaging image exceeds a set threshold: when the temperature difference is greater than or equal to 1° C., it is judged that the heating wire is defective.

5. The method for detecting the heating wire of electrically heated glass according to claim 1, characterized in that: In the step of energizing the heating wire of the electrically heated glass for heating for a predetermined time, the predetermined time is 10s to 20s.

6. The method for detecting the heating wire of electrically heated glass according to claim 1, characterized in that: The method further includes: after determining that the heating wire has a defect, determining the defect position of the heating wire based on the positions of two adjacent detection areas where the temperature difference exceeds the set threshold.

7. The method for detecting the heating wire of the electrically heated glass according to claim 1 or 6, characterized in that: The method further includes: generating an error alarm signal after determining that the heating wire is defective.

8. The method for detecting the heating wire of electrically heated glass according to claim 7, characterized in that: The error alarm signal is displayed via the thermal imaging image and / or via an alarm.

9. The method for detecting the heating wire of the electrically heated glass according to any one of claims 1 to 5, characterized in that: Before the step of energizing the electric heating wire of the electrically heated glass for a predetermined time, the method further comprises: calibrating with an error-proofing sample; The calibration includes: heating the heating wire of the error-proofing sample for a predetermined time, obtaining a thermal imaging image of the heating wire, and comparing the thermal imaging image with a reference image of the error-proofing sample. If the consistency meets the predetermined conditions, the detection is carried out, and if not, the detection is terminated.

10. The method for detecting the heating wire of the electrically heated glass according to any one of claims 1 to 5, characterized in that: The method further comprises: transporting the electrically heated glass to an inspection position on a production line before inspection; and transporting the electrically heated glass out of the inspection position after inspection.

11. A heating wire detection system for electrically heated glass, characterized in that: The system comprises: A supporting module, wherein the supporting module is configured to support and position the electrically heated glass; A heating module, wherein the heating module is configured to heat the heating wire; A thermal imaging module, wherein the thermal imaging module is configured to obtain a thermal imaging image of the heating wire after the heating wire is heated, wherein the thermal imaging image includes a plurality of detection areas; A judgment module, wherein the judgment module is configured to judge whether the heating wire has a defect based on whether the temperature difference between two adjacent detection areas of the heating wire in the thermal imaging image obtained by the thermal imaging module exceeds a set threshold after the heating module has heated for a predetermined time.

12. The heating wire detection system for electrically heated glass according to claim 11, characterized in that: The thermal imaging module includes a long-wave infrared thermal imaging camera.

13. The heating wire detection system for electrically heated glass according to claim 12, characterized in that: The size of a single pixel of the image of the long-wave infrared thermal imaging camera is 0.5 mm to 5 mm, and the size of a single pixel of the image corresponds to the size of each detection area.

14. The heating wire detection system for electrically heated glass according to claim 11, characterized in that: The set threshold is 1° C., and the judgment module is configured to judge that the heating wire is defective based on the temperature difference exceeding the set threshold.

15. The heating wire detection system for electrically heated glass according to claim 11, characterized in that: The predetermined time is 10s to 20s.

16. The heating wire detection system for electrically heated glass according to claim 11, characterized in that: The heating module comprises a power supply unit for heating the heating wire and a buffer unit connected between the power supply unit and the heating wire, wherein the buffer unit is made of a flexible material.

17. The heating wire detection system for electrically heated glass according to claim 11, characterized in that: The system further comprises a constant power supply, and the constant power supply is configured to drive the heating module, the thermal imaging module and the judgment module.

18. The heating wire detection system for electrically heated glass according to claim 11, characterized in that: The system further includes a transport module connected to the support module and configured to transport the electrically heated glass to the support module and transport the electrically heated glass out of the support module.

19. The heating wire detection system for electrically heated glass according to claim 11, characterized in that: The system further comprises an alarm module, wherein the alarm module is configured to send out an error alarm signal in response to the judgment module judging that the heating wire has a defect.

20. The heating wire detection system for electrically heated glass according to claim 11, characterized in that: The system also includes a display module configured to display the thermal imaging image.

21. The heating wire detection system for electrically heated glass according to claim 11, characterized in that: The system further includes a calibration module including a proof-on sample and configured to perform calibration using the heating module and the thermal imaging module.

22. A computer device, characterized in that: The computer device comprises a memory, a processor and instructions stored in the memory and executable by the processor, wherein the processor implements the heating wire detection method for electrically heated glass according to any one of claims 1 to 10 when executing the instructions.

23. A computer-readable storage medium, characterized in that: The computer-readable storage medium has computer-executable instructions stored thereon, and the computer-executable instructions are used to execute the heating wire detection method for electrically heated glass according to any one of claims 1 to 10.

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